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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Standard Vector Layers: Gwyddion Widgets Library Reference Manual</title>
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<div class="refentry">
<a name="standard-vector-layers"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">Standard Vector Layers</span></h2>
<p>Standard Vector Layers —
Vector layers that are distributed with <span class="application">Gwyddion</span>
</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="id-1.3.11.3"></a><h2>Overview</h2>
<p>
Vector layers, implementing means how user can draw on data views, are
provided by layer modules, so that third party tools (implemented by
tool modules)
can define their own means of user interaction.
</p>
<p>
There are several standard layers distributed with <span class="application">Gwyddion</span>,
and their features and interface is the subject of this section.
All layers are subclasses of <a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer">GwyVectorLayer</a>
sharing its basic interface.
Each layer lets the user draw or select different shapes, therefore each module also
defines its own selection object type determining the format of selection data.
All selections are subclasses of <a href="../GwySelection.html#GwySelection-struct">GwySelection</a>.
By convention, layer type Foo is called GwyLayerFoo and the corresponding selection
type GwySelectionFoo.
</p>
<p>
Layers and selections sometimes have additional object properties not present in the
base classes, these are described here too.
</p>
</div>
<div class="refsect1">
<a name="id-1.3.11.4"></a><h2>GwyLayerAxis, GwySelectionAxis</h2>
<pre class="synopsis">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerAxis"), NULL);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionAxis"), NULL);
</pre>
<p>
The layer allows selecting one or more horizontal or vertical (full-width
or full-height) lines, called axes. It can be also viewes as a way to
select separate x or y coordinates.
</p>
<p>
Selection data consists of single coordinates.
More precisely, of y-coordinates for horizontal axes and x-coordinates for vertical
axes. Each coordinate represents a selected axis.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.4.5"></a>GwyLayerAxis properties</h3></div></div></div>
<p>None.</p>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.4.6"></a>GwySelectionAxis properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><a name="GwySelectionAxis--orientation"></a>"<code class="literal">orientation</code>" (<a href="../libgwyprocess-gwyprocessenums.html#GwyOrientation">GwyOrientation</a> : Read / Write)</span></p></td>
<td><p>
Line orientation: horizontal or vertical.
The default orientation is horizontal.
</p></td>
</tr></tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.5"></a><h2>GwyLayerCross, GwySelectionCross</h2>
<pre class="synopsis">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerCross"), NULL);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionCross"), NULL);
</pre>
<p>
The layer allows selecting a number of simultaneous horizontal and vertical
lines. Usually the selection is displayed as a large cross, but it can
also show only the horizontal and vertical lines or just the cross point
marker.
</p>
<p>
Selection data consists of coordinate pairs (x, y) representing selected
cross centres.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.5.5"></a>GwyLayerCross properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerCross--draw-horizontal"></a>"<code class="literal">draw-horizontal</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether the horizontal line should be drawn.
The default is draw the horizontal line.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerCross--draw-vertical"></a>"<code class="literal">draw-vertical</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether the vertical line should be drawn.
The default is draw the vertical line.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerCross--thickness"></a>"<code class="literal">thickness</code>" (gint : Read / Write)</span></p></td>
<td><p>
Width of orthogonal ticks at line ends.
The default is no ticks.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.5.6"></a>GwySelectionCross properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.6"></a><h2>GwyLayerEllipse, GwySelectionEllipse</h2>
<pre class="synopsis">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerEllipse"), NULL);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionEllipse"), NULL);
</pre>
<p>
The layer allows selecting a number of ellipses.
</p>
<p>
Selection data consists of quadruples of coordinates (x<sub>0</sub>,
y<sub>0</sub>, x<sub>1</sub>, y<sub>1</sub>),
each representing one selected ellipse, where
x<sub>0</sub> and y<sub>0</sub> are coordinates of one
bounding box corner and x<sub>1</sub> and y<sub>1</sub>
of the opposite corner. Each one can be any of the four bounding box corners, there
is no guarantee one is for example always top-left.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.6.5"></a>GwyLayerEllipse properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerEllipse--draw-reflection"></a>"<code class="literal">draw-reflection</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether central reflection of selection should be drawn too.
The default is to not draw reflection.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerEllipse--snap-to-center"></a>"<code class="literal">snap-to-center</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether the selection should snap to the center. The default is
not to snap.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.6.6"></a>GwySelectionEllipse properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.7"></a><h2>GwyLayerLine, GwySelectionLine</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerLine"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionLine"), NULL);
</pre>
<p>
The layer allows selecting one or more lines of arbitrary orientation and
length, optionally can display line numbers next to each line.
</p>
<p>
Selection data consists of quadruples of coordinates (x<sub>0</sub>,
y<sub>0</sub>, x<sub>1</sub>, y<sub>1</sub>),
each representing one selected line, where
x<sub>0</sub> and y<sub>0</sub> are
coordinates of one line end and x<sub>1</sub> and y<sub>1</sub>
of the other end.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.7.5"></a>GwyLayerLine properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerLine--line-numbers"></a>"<code class="literal">line-numbers</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether line numbers should be displayed next to them.
The default is to show line numbers.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerLine--thickness"></a>"<code class="literal">thickness</code>" (gint : Read / Write)</span></p></td>
<td><p>
Width of orthogonal ticks at line ends.
The default is no ticks.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerLine--center-tick"></a>"<code class="literal">center-tick</code>" (gboolean : Read / Write)</span></p></td>
<td>
<p>
Whether an tick is drawn in the line centre.
The default is not to drawn the central tick.
</p>
<p class="since">Since: 2.42</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.7.6"></a>GwySelectionLine properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.8"></a><h2>GwyLayerPoint, GwySelectionPoint</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerPoint"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionPoint"), NULL);
</pre>
<p>
The layer allows selecting a number of points, either displayed as
crosses, crosses with concentric circles, or with no graphical
representation (the latter mainly useful with only one selected point).
</p>
<p>
Selection data consists of coordinate pairs (x, y) representing selected points.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.8.5"></a>GwyLayerPoint properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerPoint--draw-marker"></a>"<code class="literal">draw-marker</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
If set to TRUE, points will be displayed. Otherwise they will be invisible.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerPoint--marker-radius"></a>"<code class="literal">marker-radius</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Specifies the radius of the circle to draw around all selected points.
If set to zero and/or if "<code class="literal">draw-marker</code>" is
set to FALSE, no circle will be drawn.
The default radius is zero.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerLine--point-numbers"></a>"<code class="literal">point-numbers</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether point numbers should be displayed next to them.
The default is not to show point numbers.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerLine--draw-as-vector"></a>"<code class="literal">draw-as-vector</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether points should be instead drawn as vector from the origin.
This setting may interact poorly with other drawing options.
The default is to draw points as points.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.8.6"></a>GwySelectionPoint properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.9"></a><h2>GwyLayerRectangle, GwySelectionRectangle</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerRectangle"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionRectangle"), NULL);
</pre>
<p>
The layer allows selecting a number of rectangles, that can be drawn with
a couple of fancy/special styles.
</p>
<p>
Selection data consists of quadruples of coordinates (x<sub>0</sub>,
y<sub>0</sub>, x<sub>1</sub>, y<sub>1</sub>),
each representing one selected rectangle, where
x<sub>0</sub> and y<sub>0</sub> are coordinates of one corner
and x<sub>1</sub> and y<sub>1</sub>
of the opposite corner. Each one can be any of the four rectangle corners, there
is no guarantee one is for example always top-left.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.9.5"></a>GwyLayerRectangle properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerRectangle--is-crop"></a>"<code class="literal">is-crop</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether lines should be drawn always from border to border, as in the Crop tool.
The default is to draw just outline of the selected rectangle.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerRectangle--draw-reflection"></a>"<code class="literal">draw-reflection</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether central reflection of selection should be drawn too.
The default is to not draw reflection.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerRectangle--snap-to-center"></a>"<code class="literal">snap-to-center</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether the selection should snap to the center. The default is
to not snap.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.9.6"></a>GwySelectionRectangle properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.10"></a><h2>GwyLayerLattice, GwySelectionLattice</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerLattice"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionLattice"), NULL);
</pre>
<p>
The layer allows selecting a pair of two-dimensional vectors, that
represent a lattice in the plane.
The selection is also visualised as a lattice.
</p>
<p>
Selection data consists of quadruples of coordinates (x<sub>0</sub>,
y<sub>0</sub>, x<sub>1</sub>, y<sub>1</sub>),
each representing the two selected lattice vectors, where
x<sub>0</sub> and y<sub>0</sub> are coordinates of one vector
and x<sub>1</sub> and y<sub>1</sub>
of the other.
</p>
<p>
Although the selection can contain multiple such pairs, the layer ignores all except
the first one.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.10.6"></a>GwyLayerLattice properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><a name="GwyLayerLattice--n-lines"></a>"<code class="literal">n-lines</code>" (guint : Read / Write)</span></p></td>
<td><p>
The number of grille lines drawn along each vector.
</p></td>
</tr></tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.10.7"></a>GwySelectionLattice properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.11"></a><h2>GwyLayerProjective, GwySelectionProjective</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerProjective"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionProjective"), NULL);
</pre>
<p>
The layer allows selecting tetragons representing perspective projections of
a rectangle in the plane.
The selection is visualised as the perspective rectangle, possibly with
a grid inside.
</p>
<p>
Selection data consists of octuples of coordinates (x<sub>0</sub>,
y<sub>0</sub>, x<sub>1</sub>, y<sub>1</sub>,
x<sub>2</sub>, y<sub>2</sub>, x<sub>3</sub>,
y<sub>3</sub>),
each representing the four vertices 0, 1, 2 and 3, in order around the perimeter.
</p>
<p>
Although the selection can contain multiple such tetragon, the layer ignores all except
the first one.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.11.6"></a>GwyLayerProjective properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwyLayerProjective--n-lines"></a>"<code class="literal">n-lines</code>" (guint : Read / Write)</span></p></td>
<td><p>
The number of grille lines drawn inside the tetragon.
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwyLayerProjective--convex"></a>"<code class="literal">convex</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether editing the tetragon must leave it convex and non-degenerated.
The result of programatically setting a non-convex selection when convex is TRUE is undefined.
The default is to only allow convex tetragons.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.11.7"></a>GwySelectionProjective properties</h3></div></div></div>
<p>None.</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.3.11.12"></a><h2>GwyLayerPath, GwySelectionPath</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwyLayerPath"), NULL);
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject*</a> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-new">g_object_new</a>(<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-from-name">g_type_from_name</a>("GwySelectionPath"), NULL);
</pre>
<p>
The layer allows selecting a long spline curve passing through given
points.
</p>
<p>
Selection data consists of coordinate pairs (x, y) representing the
points defining the curve. The curve is implicitly oriented from the
first pair to the last one.
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.12.5"></a>GwyLayerPath properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><a name="GwyLayerPath--thickness"></a>"<code class="literal">thickness</code>" (gint : Read / Write)</span></p></td>
<td><p>
Width of orthogonal ticks at line ends.
The default is no ticks.
</p></td>
</tr></tbody>
</table></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.11.12.6"></a>GwySelectionPath properties</h3></div></div></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a name="GwySelectionPath--slackness"></a>"<code class="literal">closed</code>" (gdouble : Read / Write)</span></p></td>
<td><p>
How much the curve is slack/taut, from the interval [0, sqrt(2)].
Value of 0 corresponds to completely taut curve, i.e. straight
lines connecting the points.
Value of 1 corresponds to free curve.
The default value is 1/sqrt(2).
</p></td>
</tr>
<tr>
<td><p><span class="term"><a name="GwySelectionPath--closed"></a>"<code class="literal">closed</code>" (gboolean : Read / Write)</span></p></td>
<td><p>
Whether the curve is closed, i.e. continues smoothly from the
last point back to the first point.
The default is open-ended (not closed) curve.
</p></td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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