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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>GimpVector</title><meta name="generator" content="DocBook XSL Stylesheets V1.66.1"><link rel="start" href="index.html" title="GIMP Math Library Reference Manual"><link rel="up" href="libgimpmath.html" title="PartI.GIMP Math Library"><link rel="prev" href="libgimpmath-GimpMatrix.html" title="GimpMatrix"><link rel="next" href="libgimpmath-GimpMD5.html" title="GimpMD5"><meta name="generator" content="GTK-Doc V1.2 (XML mode)"><style type="text/css">
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</style></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="libgimpmath-GimpMatrix.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="libgimpmath.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GIMP Math Library Reference Manual</th><td><a accesskey="n" href="libgimpmath-GimpMD5.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="libgimpmath-GimpVector"></a><div class="titlepage"></div><div class="refnamediv"><h2><span class="refentrytitle">GimpVector</span></h2><p>GimpVector — Utilities to set up and manipulate vectors.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
struct <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a>;
struct <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a>;
struct <a href="libgimpmath-GimpVector.html#GimpVector4">GimpVector4</a>;
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-new">gimp_vector2_new</a> (gdouble x,
gdouble y);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-set">gimp_vector2_set</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble x,
gdouble y);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector2-length">gimp_vector2_length</a> (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector2-length-val">gimp_vector2_length_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-mul">gimp_vector2_mul</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble factor);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-mul-val">gimp_vector2_mul_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector,
gdouble factor);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-normalize">gimp_vector2_normalize</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-normalize-val">gimp_vector2_normalize_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-neg">gimp_vector2_neg</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-neg-val">gimp_vector2_neg_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-add">gimp_vector2_add</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-add-val">gimp_vector2_add_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-sub">gimp_vector2_sub</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-sub-val">gimp_vector2_sub_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector2-inner-product">gimp_vector2_inner_product</a> (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector2-inner-product-val">gimp_vector2_inner_product_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-cross-product">gimp_vector2_cross_product</a> (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-cross-product-val">gimp_vector2_cross_product_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);
void <a href="libgimpmath-GimpVector.html#gimp-vector2-rotate">gimp_vector2_rotate</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble alpha);
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> <a href="libgimpmath-GimpVector.html#gimp-vector2-rotate-val">gimp_vector2_rotate_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector,
gdouble alpha);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-new">gimp_vector3_new</a> (gdouble x,
gdouble y,
gdouble z);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-set">gimp_vector3_set</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble x,
gdouble y,
gdouble z);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector3-length">gimp_vector3_length</a> (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector3-length-val">gimp_vector3_length_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-mul">gimp_vector3_mul</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble factor);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-mul-val">gimp_vector3_mul_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector,
gdouble factor);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-normalize">gimp_vector3_normalize</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-normalize-val">gimp_vector3_normalize_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-neg">gimp_vector3_neg</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-neg-val">gimp_vector3_neg_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-add">gimp_vector3_add</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-add-val">gimp_vector3_add_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-sub">gimp_vector3_sub</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-sub-val">gimp_vector3_sub_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector3-inner-product">gimp_vector3_inner_product</a> (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);
gdouble <a href="libgimpmath-GimpVector.html#gimp-vector3-inner-product-val">gimp_vector3_inner_product_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-cross-product">gimp_vector3_cross_product</a> (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-cross-product-val">gimp_vector3_cross_product_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);
void <a href="libgimpmath-GimpVector.html#gimp-vector3-rotate">gimp_vector3_rotate</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble alpha,
gdouble beta,
gdouble gamma);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector3-rotate-val">gimp_vector3_rotate_val</a> (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector,
gdouble alpha,
gdouble beta,
gdouble gamma);
void <a href="libgimpmath-GimpVector.html#gimp-vector-2d-to-3d">gimp_vector_2d_to_3d</a> (gint sx,
gint sy,
gint w,
gint h,
gint x,
gint y,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vp,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *p);
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> <a href="libgimpmath-GimpVector.html#gimp-vector-2d-to-3d-val">gimp_vector_2d_to_3d_val</a> (gint sx,
gint sy,
gint w,
gint h,
gint x,
gint y,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vp,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> p);
void <a href="libgimpmath-GimpVector.html#gimp-vector-3d-to-2d">gimp_vector_3d_to_2d</a> (gint sx,
gint sy,
gint w,
gint h,
gdouble *x,
gdouble *y,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vp,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *p);
</pre></div><div class="refsect1" lang="en"><a name="id2588177"></a><h2>Description</h2><p>
Utilities to set up and manipulate vectors.
</p></div><div class="refsect1" lang="en"><a name="id2588188"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id2588193"></a><h3><a name="GimpVector2"></a>struct GimpVector2</h3><a class="indexterm" name="id2588201"></a><pre class="programlisting">struct GimpVector2 {
gdouble x, y;
};
</pre><p>
A two dimensional vector.
</p></div><hr><div class="refsect2" lang="en"><a name="id2588211"></a><h3><a name="GimpVector3"></a>struct GimpVector3</h3><a class="indexterm" name="id2588219"></a><pre class="programlisting">struct GimpVector3 {
gdouble x, y, z;
};
</pre><p>
A three dimensional vector.
</p></div><hr><div class="refsect2" lang="en"><a name="id2588230"></a><h3><a name="GimpVector4"></a>struct GimpVector4</h3><a class="indexterm" name="id2588238"></a><pre class="programlisting">struct GimpVector4 {
gdouble x, y, z, w;
};
</pre><p>
A four dimensional vector.
</p></div><hr><div class="refsect2" lang="en"><a name="id2588249"></a><h3><a name="gimp-vector2-new"></a>gimp_vector2_new ()</h3><a class="indexterm" name="id2588257"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_new (gdouble x,
gdouble y);</pre><p>
Creates a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> of coordinates <i class="parameter"><tt>x</tt></i> and <i class="parameter"><tt>y</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the X coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the Y coordinate.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588340"></a><h3><a name="gimp-vector2-set"></a>gimp_vector2_set ()</h3><a class="indexterm" name="id2588348"></a><pre class="programlisting">void gimp_vector2_set (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble x,
gdouble y);</pre><p>
Sets the X and Y coordinates of <i class="parameter"><tt>vector</tt></i> to <i class="parameter"><tt>x</tt></i> and <i class="parameter"><tt>y</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the X coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the Y coordinate.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588435"></a><h3><a name="gimp-vector2-length"></a>gimp_vector2_length ()</h3><a class="indexterm" name="id2588444"></a><pre class="programlisting">gdouble gimp_vector2_length (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);</pre><p>
Computes the length of a 2D vector.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the length of <i class="parameter"><tt>vector</tt></i> (a positive gdouble).
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588500"></a><h3><a name="gimp-vector2-length-val"></a>gimp_vector2_length_val ()</h3><a class="indexterm" name="id2588509"></a><pre class="programlisting">gdouble gimp_vector2_length_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-length"><tt class="function">gimp_vector2_length()</tt></a> but the
vector is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the length of <i class="parameter"><tt>vector</tt></i> (a positive gdouble).
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588574"></a><h3><a name="gimp-vector2-mul"></a>gimp_vector2_mul ()</h3><a class="indexterm" name="id2588582"></a><pre class="programlisting">void gimp_vector2_mul (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble factor);</pre><p>
Multiplies each component of the <i class="parameter"><tt>vector</tt></i> by <i class="parameter"><tt>factor</tt></i>. Note that this
is equivalent to multiplying the vectors length by <i class="parameter"><tt>factor</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>factor</tt></i>:</span></td><td> a scalar.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588655"></a><h3><a name="gimp-vector2-mul-val"></a>gimp_vector2_mul_val ()</h3><a class="indexterm" name="id2588663"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_mul_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector,
gdouble factor);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-mul"><tt class="function">gimp_vector2_mul()</tt></a> but the vector is
passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>factor</tt></i>:</span></td><td> a scalar.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588748"></a><h3><a name="gimp-vector2-normalize"></a>gimp_vector2_normalize ()</h3><a class="indexterm" name="id2588756"></a><pre class="programlisting">void gimp_vector2_normalize (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);</pre><p>
Normalizes the <i class="parameter"><tt>vector</tt></i> so the length of the <i class="parameter"><tt>vector</tt></i> is 1.0. The nul
vector will not be changed.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588808"></a><h3><a name="gimp-vector2-normalize-val"></a>gimp_vector2_normalize_val ()</h3><a class="indexterm" name="id2588817"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_normalize_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-normalize"><tt class="function">gimp_vector2_normalize()</tt></a> but the
vector is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> parallel to <i class="parameter"><tt>vector</tt></i>, pointing in the same
direction but with a length of 1.0.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588889"></a><h3><a name="gimp-vector2-neg"></a>gimp_vector2_neg ()</h3><a class="indexterm" name="id2588897"></a><pre class="programlisting">void gimp_vector2_neg (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector);</pre><p>
Negates the <i class="parameter"><tt>vector</tt></i> (i.e. negate all its coordinates).</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2588945"></a><h3><a name="gimp-vector2-neg-val"></a>gimp_vector2_neg_val ()</h3><a class="indexterm" name="id2588954"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_neg_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-neg"><tt class="function">gimp_vector2_neg()</tt></a> but the vector
is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the negated <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589021"></a><h3><a name="gimp-vector2-add"></a>gimp_vector2_add ()</h3><a class="indexterm" name="id2589030"></a><pre class="programlisting">void gimp_vector2_add (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);</pre><p>
Computes the sum of two 2D vectors. The resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> is
stored in <i class="parameter"><tt>result</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>result</tt></i>:</span></td><td> destination for the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589132"></a><h3><a name="gimp-vector2-add-val"></a>gimp_vector2_add_val ()</h3><a class="indexterm" name="id2589140"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_add_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-add"><tt class="function">gimp_vector2_add()</tt></a> but the vectors
are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589231"></a><h3><a name="gimp-vector2-sub"></a>gimp_vector2_sub ()</h3><a class="indexterm" name="id2589239"></a><pre class="programlisting">void gimp_vector2_sub (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);</pre><p>
Computes the difference of two 2D vectors (<i class="parameter"><tt>vector1</tt></i> minus <i class="parameter"><tt>vector2</tt></i>).
The resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> is stored in <i class="parameter"><tt>result</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>result</tt></i>:</span></td><td> the destination for the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589348"></a><h3><a name="gimp-vector2-sub-val"></a>gimp_vector2_sub_val ()</h3><a class="indexterm" name="id2589356"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_sub_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-sub"><tt class="function">gimp_vector2_sub()</tt></a> but the vectors
are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589447"></a><h3><a name="gimp-vector2-inner-product"></a>gimp_vector2_inner_product ()</h3><a class="indexterm" name="id2589456"></a><pre class="programlisting">gdouble gimp_vector2_inner_product (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);</pre><p>
Computes the inner (dot) product of two 2D vectors.
This product is zero if and only if the two vectors are orthognal.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The inner product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589535"></a><h3><a name="gimp-vector2-inner-product-val"></a>gimp_vector2_inner_product_val ()</h3><a class="indexterm" name="id2589546"></a><pre class="programlisting">gdouble gimp_vector2_inner_product_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-inner-product"><tt class="function">gimp_vector2_inner_product()</tt></a> but the
vectors are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The inner product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589633"></a><h3><a name="gimp-vector2-cross-product"></a>gimp_vector2_cross_product ()</h3><a class="indexterm" name="id2589642"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_cross_product (const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector2);</pre><p>
Compute the cross product of two vectors. The result is a
<a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> which is orthognal to both <i class="parameter"><tt>vector1</tt></i> and <i class="parameter"><tt>vector2</tt></i>. If
<i class="parameter"><tt>vector1</tt></i> and <i class="parameter"><tt>vector2</tt></i> are parallel, the result will be the nul
vector.
</p><p>
Note that in 2D, this function is useful to test if two vectors are
parallel or not, or to compute the area spawned by two vectors.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The cross product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589746"></a><h3><a name="gimp-vector2-cross-product-val"></a>gimp_vector2_cross_product_val ()</h3><a class="indexterm" name="id2589757"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_cross_product_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-cross-product"><tt class="function">gimp_vector2_cross_product()</tt></a> but the
vectors are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The cross product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589843"></a><h3><a name="gimp-vector2-rotate"></a>gimp_vector2_rotate ()</h3><a class="indexterm" name="id2589853"></a><pre class="programlisting">void gimp_vector2_rotate (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> *vector,
gdouble alpha);</pre><p>
Rotates the <i class="parameter"><tt>vector</tt></i> counterclockwise by <i class="parameter"><tt>alpha</tt></i> radians.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>alpha</tt></i>:</span></td><td> an angle (in radians).
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2589934"></a><h3><a name="gimp-vector2-rotate-val"></a>gimp_vector2_rotate_val ()</h3><a class="indexterm" name="id2589944"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> gimp_vector2_rotate_val (<a href="libgimpmath-GimpVector.html#GimpVector2">GimpVector2</a> vector,
gdouble alpha);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector2-rotate"><tt class="function">gimp_vector2_rotate()</tt></a> but the vector
is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>alpha</tt></i>:</span></td><td> an angle (in radians).
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector2"><span class="type">GimpVector2</span></a> representing <i class="parameter"><tt>vector</tt></i> rotated by <i class="parameter"><tt>alpha</tt></i>
radians.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590018"></a><h3><a name="gimp-vector3-new"></a>gimp_vector3_new ()</h3><a class="indexterm" name="id2590026"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_new (gdouble x,
gdouble y,
gdouble z);</pre><p>
Creates a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> of coordinate <i class="parameter"><tt>x</tt></i>, <i class="parameter"><tt>y</tt></i> and <i class="parameter"><tt>z</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the X coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the Y coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>z</tt></i>:</span></td><td> the Z coordinate.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590120"></a><h3><a name="gimp-vector3-set"></a>gimp_vector3_set ()</h3><a class="indexterm" name="id2590128"></a><pre class="programlisting">void gimp_vector3_set (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble x,
gdouble y,
gdouble z);</pre><p>
Sets the X, Y and Z coordinates of <i class="parameter"><tt>vector</tt></i> to <i class="parameter"><tt>x</tt></i>, <i class="parameter"><tt>y</tt></i> and <i class="parameter"><tt>z</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the X coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the Y coordinate.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>z</tt></i>:</span></td><td> the Z coordinate.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590236"></a><h3><a name="gimp-vector3-length"></a>gimp_vector3_length ()</h3><a class="indexterm" name="id2590245"></a><pre class="programlisting">gdouble gimp_vector3_length (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);</pre><p>
Computes the length of a 3D vector.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the length of <i class="parameter"><tt>vector</tt></i> (a positive gdouble).
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590302"></a><h3><a name="gimp-vector3-length-val"></a>gimp_vector3_length_val ()</h3><a class="indexterm" name="id2590311"></a><pre class="programlisting">gdouble gimp_vector3_length_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-length"><tt class="function">gimp_vector3_length()</tt></a> but the vector
is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the length of <i class="parameter"><tt>vector</tt></i> (a positive gdouble).
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590376"></a><h3><a name="gimp-vector3-mul"></a>gimp_vector3_mul ()</h3><a class="indexterm" name="id2590384"></a><pre class="programlisting">void gimp_vector3_mul (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble factor);</pre><p>
Multiplies each component of the <i class="parameter"><tt>vector</tt></i> by <i class="parameter"><tt>factor</tt></i>. Note that
this is equivalent to multiplying the vectors length by <i class="parameter"><tt>factor</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>factor</tt></i>:</span></td><td> a scalar.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590457"></a><h3><a name="gimp-vector3-mul-val"></a>gimp_vector3_mul_val ()</h3><a class="indexterm" name="id2590465"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_mul_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector,
gdouble factor);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-mul"><tt class="function">gimp_vector3_mul()</tt></a> but the vector is
passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>factor</tt></i>:</span></td><td> a scalar.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590550"></a><h3><a name="gimp-vector3-normalize"></a>gimp_vector3_normalize ()</h3><a class="indexterm" name="id2590558"></a><pre class="programlisting">void gimp_vector3_normalize (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);</pre><p>
Normalizes the <i class="parameter"><tt>vector</tt></i> so the length of the <i class="parameter"><tt>vector</tt></i> is 1.0. The nul
vector will not be changed.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590610"></a><h3><a name="gimp-vector3-normalize-val"></a>gimp_vector3_normalize_val ()</h3><a class="indexterm" name="id2590619"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_normalize_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-normalize"><tt class="function">gimp_vector3_normalize()</tt></a> but the
vector is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> parallel to <i class="parameter"><tt>vector</tt></i>, pointing in the same
direction but with a length of 1.0.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590691"></a><h3><a name="gimp-vector3-neg"></a>gimp_vector3_neg ()</h3><a class="indexterm" name="id2590699"></a><pre class="programlisting">void gimp_vector3_neg (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector);</pre><p>
Negates the <i class="parameter"><tt>vector</tt></i> (i.e. negate all its coordinates).</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590747"></a><h3><a name="gimp-vector3-neg-val"></a>gimp_vector3_neg_val ()</h3><a class="indexterm" name="id2590756"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_neg_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-neg"><tt class="function">gimp_vector3_neg()</tt></a> but the vector
is passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the negated <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590823"></a><h3><a name="gimp-vector3-add"></a>gimp_vector3_add ()</h3><a class="indexterm" name="id2590832"></a><pre class="programlisting">void gimp_vector3_add (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);</pre><p>
Computes the sum of two 3D vectors. The resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> is
stored in <i class="parameter"><tt>result</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>result</tt></i>:</span></td><td> destination for the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2590934"></a><h3><a name="gimp-vector3-add-val"></a>gimp_vector3_add_val ()</h3><a class="indexterm" name="id2590942"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_add_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-add"><tt class="function">gimp_vector3_add()</tt></a> but the vectors
are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591033"></a><h3><a name="gimp-vector3-sub"></a>gimp_vector3_sub ()</h3><a class="indexterm" name="id2591041"></a><pre class="programlisting">void gimp_vector3_sub (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *result,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);</pre><p>
Computes the difference of two 3D vectors (<i class="parameter"><tt>vector1</tt></i> minus <i class="parameter"><tt>vector2</tt></i>).
The resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> is stored in <i class="parameter"><tt>result</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>result</tt></i>:</span></td><td> the destination for the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591150"></a><h3><a name="gimp-vector3-sub-val"></a>gimp_vector3_sub_val ()</h3><a class="indexterm" name="id2591158"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_sub_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-sub"><tt class="function">gimp_vector3_sub()</tt></a> but the vectors
are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the resulting <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591249"></a><h3><a name="gimp-vector3-inner-product"></a>gimp_vector3_inner_product ()</h3><a class="indexterm" name="id2591258"></a><pre class="programlisting">gdouble gimp_vector3_inner_product (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);</pre><p>
Computes the inner (dot) product of two 3D vectors. This product
is zero if and only if the two vectors are orthognal.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The inner product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591337"></a><h3><a name="gimp-vector3-inner-product-val"></a>gimp_vector3_inner_product_val ()</h3><a class="indexterm" name="id2591348"></a><pre class="programlisting">gdouble gimp_vector3_inner_product_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-inner-product"><tt class="function">gimp_vector3_inner_product()</tt></a> but the
vectors are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The inner product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591452"></a><h3><a name="gimp-vector3-cross-product"></a>gimp_vector3_cross_product ()</h3><a class="indexterm" name="id2591465"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_cross_product (const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector1,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector2);</pre><p>
Compute the cross product of two vectors. The result is a
<a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> which is orthognal to both <i class="parameter"><tt>vector1</tt></i> and <i class="parameter"><tt>vector2</tt></i>. If
<i class="parameter"><tt>vector1</tt></i> and <i class="parameter"><tt>vector2</tt></i> and parallel, the result will be the nul
vector.
</p><p>
This function can be used to compute the normal of the plane
defined by <i class="parameter"><tt>vector1</tt></i> and <i class="parameter"><tt>vector2</tt></i>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> a pointer to the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> a pointer to the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The cross product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591601"></a><h3><a name="gimp-vector3-cross-product-val"></a>gimp_vector3_cross_product_val ()</h3><a class="indexterm" name="id2591614"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_cross_product_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector1,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector2);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-cross-product"><tt class="function">gimp_vector3_cross_product()</tt></a> but the
vectors are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector1</tt></i>:</span></td><td> the first <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vector2</tt></i>:</span></td><td> the second <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> The cross product.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591721"></a><h3><a name="gimp-vector3-rotate"></a>gimp_vector3_rotate ()</h3><a class="indexterm" name="id2591734"></a><pre class="programlisting">void gimp_vector3_rotate (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vector,
gdouble alpha,
gdouble beta,
gdouble gamma);</pre><p>
Rotates the <i class="parameter"><tt>vector</tt></i> around the three axis (Z, Y, and X) by <i class="parameter"><tt>alpha</tt></i>,
<i class="parameter"><tt>beta</tt></i> and <i class="parameter"><tt>gamma</tt></i>, respectively.
</p><p>
Note that the order of the rotation is very important. If you
expect a vector to be rotated around X, and then around Y, you will
have to call this function twice. Also, it is often wise to call
this function with only one of <i class="parameter"><tt>alpha</tt></i>, <i class="parameter"><tt>beta</tt></i> and <i class="parameter"><tt>gamma</tt></i> non-zero.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a pointer to a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>alpha</tt></i>:</span></td><td> the angle (in radian) of rotation around the Z axis.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>beta</tt></i>:</span></td><td> the angle (in radian) of rotation around the Y axis.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>gamma</tt></i>:</span></td><td> the angle (in radian) of rotation around the X axis.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2591890"></a><h3><a name="gimp-vector3-rotate-val"></a>gimp_vector3_rotate_val ()</h3><a class="indexterm" name="id2591902"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector3_rotate_val (<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vector,
gdouble alpha,
gdouble beta,
gdouble gamma);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector3-rotate"><tt class="function">gimp_vector3_rotate()</tt></a> but the vectors
are passed by value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>vector</tt></i>:</span></td><td> a <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a>.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>alpha</tt></i>:</span></td><td> the angle (in radian) of rotation around the Z axis.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>beta</tt></i>:</span></td><td> the angle (in radian) of rotation around the Y axis.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>gamma</tt></i>:</span></td><td> the angle (in radian) of rotation around the X axis.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the rotated vector.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2592044"></a><h3><a name="gimp-vector-2d-to-3d"></a>gimp_vector_2d_to_3d ()</h3><a class="indexterm" name="id2592058"></a><pre class="programlisting">void gimp_vector_2d_to_3d (gint sx,
gint sy,
gint w,
gint h,
gint x,
gint y,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vp,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *p);</pre><p>
\"Compute screen (sx, sy) - (sx + w, sy + h) to 3D unit square
mapping. The plane to map to is given in the z field of p. The
observer is located at position vp (vp->z != 0.0).\"
</p><p>
In other words, this computes the projection of the point (<i class="parameter"><tt>x</tt></i>, <i class="parameter"><tt>y</tt></i>)
to the plane z = <i class="parameter"><tt>p->z</tt></i> (parallel to XY), from the <i class="parameter"><tt>vp</tt></i> point of view
through the screen (<i class="parameter"><tt>sx</tt></i>, <i class="parameter"><tt>sy</tt></i>)->(<i class="parameter"><tt>sx</tt></i> + <i class="parameter"><tt>w</tt></i>, <i class="parameter"><tt>sy</tt></i> + <i class="parameter"><tt>h</tt></i>)</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>sx</tt></i>:</span></td><td> the abscisse of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>sy</tt></i>:</span></td><td> the ordinate of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>w</tt></i>:</span></td><td> the width of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>h</tt></i>:</span></td><td> the height of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the abscisse of the point in the screen rectangle to map.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the ordinate of the point in the screen rectangle to map.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vp</tt></i>:</span></td><td> the position of the observer.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>p</tt></i>:</span></td><td> the resulting point.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2592303"></a><h3><a name="gimp-vector-2d-to-3d-val"></a>gimp_vector_2d_to_3d_val ()</h3><a class="indexterm" name="id2592316"></a><pre class="programlisting"><a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> gimp_vector_2d_to_3d_val (gint sx,
gint sy,
gint w,
gint h,
gint x,
gint y,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> vp,
<a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> p);</pre><p>
This function is identical to <a href="libgimpmath-GimpVector.html#gimp-vector-2d-to-3d"><tt class="function">gimp_vector_2d_to_3d()</tt></a> but the
position of the <i class="parameter"><tt>observer</tt></i> and the resulting point <i class="parameter"><tt>p</tt></i> are passed by
value rather than by reference.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>sx</tt></i>:</span></td><td> the abscisse of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>sy</tt></i>:</span></td><td> the ordinate of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>w</tt></i>:</span></td><td> the width of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>h</tt></i>:</span></td><td> the height of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the abscisse of the point in the screen rectangle to map.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the ordinate of the point in the screen rectangle to map.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vp</tt></i>:</span></td><td> position of the observer.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>p</tt></i>:</span></td><td> the resulting point.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the computed <a href="libgimpmath-GimpVector.html#GimpVector3"><span class="type">GimpVector3</span></a> point.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2592551"></a><h3><a name="gimp-vector-3d-to-2d"></a>gimp_vector_3d_to_2d ()</h3><a class="indexterm" name="id2592564"></a><pre class="programlisting">void gimp_vector_3d_to_2d (gint sx,
gint sy,
gint w,
gint h,
gdouble *x,
gdouble *y,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *vp,
const <a href="libgimpmath-GimpVector.html#GimpVector3">GimpVector3</a> *p);</pre><p>
Convert the given 3D point to 2D (project it onto the viewing
plane, (sx, sy, 0) - (sx + w, sy + h, 0). The input is assumed to
be in the unit square (0, 0, z) - (1, 1, z). The viewpoint of the
observer is passed in vp.
</p><p>
This is basically the opposite of <a href="libgimpmath-GimpVector.html#gimp-vector-2d-to-3d"><tt class="function">gimp_vector_2d_to_3d()</tt></a>.</p><p>
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>sx</tt></i>:</span></td><td> the abscisse of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>sy</tt></i>:</span></td><td> the ordinate of the upper-left screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>w</tt></i>:</span></td><td> the width of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>h</tt></i>:</span></td><td> the height of the screen rectangle.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>x</tt></i>:</span></td><td> the abscisse of the point in the screen rectangle to map (return value).
</td></tr><tr><td><span class="term"><i class="parameter"><tt>y</tt></i>:</span></td><td> the ordinate of the point in the screen rectangle to map (return value).
</td></tr><tr><td><span class="term"><i class="parameter"><tt>vp</tt></i>:</span></td><td> position of the observer.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>p</tt></i>:</span></td><td> the 3D point to project to the plane.
</td></tr></tbody></table></div></div></div><div class="refsect1" lang="en"><a name="id2592780"></a><h2>See Also</h2><p>
<a href="libgimpmath-GimpMatrix.html#GimpMatrix3"><span class="type">GimpMatrix3</span></a>
</p><p>
<a href="libgimpmath-GimpMatrix.html#GimpMatrix4"><span class="type">GimpMatrix4</span></a>
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