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<h6 id="header">RMagick 0.0.0 User's Guide and Reference</h6>
<div class="nav">« <a href="rvgshape.html">Prev</a> | <a href="index.html">Contents</a> | <a href="index.html">Next</a> »</div>
<h1>The transform methods</h1>
<div id="toc">
<h2>Table of Contents</h2>
<h3>About the transform methods</h3>
<h3>Transform methods</h3>
<ul>
<li><a href="#matrix">matrix</a></li>
<li><a href="#rotate">rotate</a></li>
<li><a href="#scale">scale</a></li>
<li><a href="#skewX">skewX</a></li>
<li><a href="#skewY">skewY</a></li>
<li><a href="#translate">translate</a></li>
</ul>
</div>
<div class="subhd">
<h2>About the transform methods</h2>
</div>
<div class="intro">
<p>
The default coordinate system has its origin in the upper-left corner. The positive x-axis extends to the right. The positive y-axis extends downward.
You can change this coordinate system by using one or more of the transform methods described on this page. This image shows the default coordinate
system.
</p>
<p>
<a href="javascript:popup('initial_coords.rb.html')"
><img src="ex/initial_coords.gif" title="Click to see the example script" alt="initial coordinates example"
/></a>
</p>
<p>This image shows a drawing without transformations.</p>
<p>
<a href="javascript:popup('orig_coord_sys.rb.html')"
><img src="ex/orig_coord_sys.gif" title="Click to see the example script" alt="a drawing without transformations"
/></a>
</p>
<p>
The transform methods are defined in the <a href="rvg.html">RVG</a>, <a href="rvggroup.html">RVG::Group</a>, and
<a href="rvguse.html">RVG::Use</a> classes. You can also chain these methods to the <a href="rvgshape.html">shape methods</a> and to the
<a href="rvgimage.html">image</a> method.
</p>
</div>
<div class="subhd">
<h2>Transform methods</h2>
</div>
<div class="sig">
<h4 id="matrix">matrix</h4>
<p>
<span class="arg">obj</span>.matrix(<span class="arg">sx</span>, <span class="arg">rx</span>, <span class="arg">ry</span>, <span class="arg">sy</span>,
<span class="arg">tx</span>, <span class="arg">ty</span>) -> <em>obj</em>
</p>
</div>
<div class="desc">
<h5>Description</h5>
<p>
Replaces the current transformation matrix with a new matrix having the specified values. See the
<a href="https://www.w3.org/TR/SVG11/coords.html#TransformAttribute">SVG standard</a>
for more information.
</p>
<h5>Arguments</h5>
<dl>
<dt>sx, sy</dt>
<dd>The scale factor in the <em>x</em>-dimension and <em>y</em>-dimension, measured in user coordinates.</dd>
<dt>rx, ry</dt>
<dd>The amount of rotation about the x-axis and y-axis, measured in degrees.</dd>
<dt>tx, ty</dt>
<dd>The translation on the <em>x</em>-axis and the <em>y</em>-axis, measured in user coordinates.</dd>
</dl>
</div>
<div class="sig">
<h4 id="rotate">rotate</h4>
<p>
<span class="arg">obj</span>.rotate(<span class="arg">angle</span>[, <span class="arg">cx</span>, <span class="arg">cy</span>]) ->
<em>obj</em>
</p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Rotates the axes about the origin or, if <span class="arg">cx</span> and <span class="arg">cy</span> are present, about the specified point.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The amount of rotation. Positive angles rotate clockwise, negative angles rotate counter-clockwise.</dd>
<dt>cx, cy</dt>
<dd>If present, the point to rotate about.</dd>
</dl>
<h5>Example</h5>
<p>See <a href="#scale">scale</a>.</p>
</div>
<div class="sig">
<h4 id="scale">scale</h4>
<p><span class="arg">obj</span>.scale(<span class="arg">sx</span>[, <span class="arg">sy</span>]) -> <em>obj</em></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Scales the axes.</p>
<h5>Arguments</h5>
<dl>
<dt>sx</dt>
<dd>The amount of scaling on the <em>x</em>-axis.</dd>
<dt>sy</dt>
<dd>If present, the amount of scaling on the <em>y</em>-axis. Otherwise defaults to <span class="arg">sx</span>.</dd>
</dl>
<h5>Example</h5>
<p>
<a href="javascript:popup('rotate_scale.rb.html')"
><img src="ex/rotate_scale.gif" title="Click to see the example script" alt="rotate and scale example"
/></a>
</p>
</div>
<div class="sig">
<h4 id="skewX">skewX</h4>
<p>
<span class="arg">obj</span>.skewX(<span class="arg">angle</span>) ->
<em>obj</em>
</p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Skews the <em>x</em>-axis.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The skew amount, measured in degrees.</dd>
</dl>
<h5>Example</h5>
<p>See <a href="#skewY">skewY</a></p>
</div>
<div class="sig">
<h4 id="skewY">skewY</h4>
<p>
<span class="arg">obj</span>.skewY(<span class="arg">angle</span>) ->
<em>obj</em>
</p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Skews the <em>y</em>-axis.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The skew amount, measured in degrees.</dd>
</dl>
<h5>Example</h5>
<p>
<a href="javascript:popup('skew.rb.html')"><img src="ex/skew.gif" title="Click to see the example script" alt="skewX and skewY example" /></a>
</p>
</div>
<div class="sig">
<h4 id="translate">translate</h4>
<p><span class="arg">obj</span>.translate(<span class="arg">tx</span>[, <span class="arg">ty</span>]) -> <em>obj</em></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Moves the origin.</p>
<h5>Arguments</h5>
<dl>
<dt>tx</dt>
<dd>The location of the new origin on the x-axis.</dd>
<dt>ty</dt>
<dd>
The location of the new origin on the y-axis. If omitted, defaults to
<span class="arg">tx</span>.
</dd>
</dl>
<h5>Example</h5>
<p>
<a href="javascript:popup('new_coord_sys.rb.html')"
><img src="ex/new_coord_sys.gif" title="Click to see the example script" alt="translate example"
/></a>
</p>
</div>
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