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<a name="GocCanvas"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GocCanvas.top_of_page"></a>GocCanvas</span></h2>
<p>GocCanvas — The canvas widget</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="GocCanvas.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="GocCanvas.html#GocCanvas-struct" title="GocCanvas">GocCanvas</a>;
typedef <a class="link" href="GocCanvas.html#GocCanvasClass" title="GocCanvasClass">GocCanvasClass</a>;
enum <a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection">GocDirection</a>;
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-c2w" title="goc_canvas_c2w ()">goc_canvas_c2w</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>,
<em class="parameter"><code><span class="type">int</span> *x_</code></em>,
<em class="parameter"><code><span class="type">int</span> *y_</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-get-bounds" title="goc_canvas_get_bounds ()">goc_canvas_get_bounds</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>);
<a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEvent"><span class="returnvalue">GdkEvent</span></a> * <a class="link" href="GocCanvas.html#goc-canvas-get-cur-event" title="goc_canvas_get_cur_event ()">goc_canvas_get_cur_event</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="returnvalue">GocDirection</span></a> <a class="link" href="GocCanvas.html#goc-canvas-get-direction" title="goc_canvas_get_direction ()">goc_canvas_get_direction</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a class="link" href="GODoc.html" title="GODoc"><span class="returnvalue">GODoc</span></a> * <a class="link" href="GocCanvas.html#goc-canvas-get-document" title="goc_canvas_get_document ()">goc_canvas_get_document</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a class="link" href="GocItem.html" title="GocItem"><span class="returnvalue">GocItem</span></a> * <a class="link" href="GocCanvas.html#goc-canvas-get-grabbed-item" title="goc_canvas_get_grabbed_item ()">goc_canvas_get_grabbed_item</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<span class="returnvalue">int</span> <a class="link" href="GocCanvas.html#goc-canvas-get-height" title="goc_canvas_get_height ()">goc_canvas_get_height</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a class="link" href="GocItem.html" title="GocItem"><span class="returnvalue">GocItem</span></a> * <a class="link" href="GocCanvas.html#goc-canvas-get-item-at" title="goc_canvas_get_item_at ()">goc_canvas_get_item_at</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<span class="returnvalue">double</span> <a class="link" href="GocCanvas.html#goc-canvas-get-pixels-per-unit" title="goc_canvas_get_pixels_per_unit ()">goc_canvas_get_pixels_per_unit</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GocCanvas.html#goc-canvas-get-realized" title="goc_canvas_get_realized ()">goc_canvas_get_realized</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<a class="link" href="GocGroup.html" title="GocGroup"><span class="returnvalue">GocGroup</span></a> * <a class="link" href="GocCanvas.html#goc-canvas-get-root" title="goc_canvas_get_root ()">goc_canvas_get_root</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-get-scroll-position" title="goc_canvas_get_scroll_position ()">goc_canvas_get_scroll_position</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> *x</code></em>,
<em class="parameter"><code><span class="type">double</span> *y</code></em>);
<span class="returnvalue">int</span> <a class="link" href="GocCanvas.html#goc-canvas-get-width" title="goc_canvas_get_width ()">goc_canvas_get_width</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-grab-item" title="goc_canvas_grab_item ()">goc_canvas_grab_item</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a> *item</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-invalidate" title="goc_canvas_invalidate ()">goc_canvas_invalidate</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</code></em>,
<em class="parameter"><code><span class="type">double</span> x1</code></em>,
<em class="parameter"><code><span class="type">double</span> y1</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-render" title="goc_canvas_render ()">goc_canvas_render</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-t.html#cairo-t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</code></em>,
<em class="parameter"><code><span class="type">double</span> x1</code></em>,
<em class="parameter"><code><span class="type">double</span> y1</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-scroll-to" title="goc_canvas_scroll_to ()">goc_canvas_scroll_to</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-set-direction" title="goc_canvas_set_direction ()">goc_canvas_set_direction</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="type">GocDirection</span></a> direction</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-set-document" title="goc_canvas_set_document ()">goc_canvas_set_document</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GODoc.html" title="GODoc"><span class="type">GODoc</span></a> *document</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-set-pixels-per-unit" title="goc_canvas_set_pixels_per_unit ()">goc_canvas_set_pixels_per_unit</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> pixels_per_unit</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-ungrab-item" title="goc_canvas_ungrab_item ()">goc_canvas_ungrab_item</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GocCanvas.html#goc-canvas-w2c" title="goc_canvas_w2c ()">goc_canvas_w2c</a> (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">int</span> x</code></em>,
<em class="parameter"><code><span class="type">int</span> y</code></em>,
<em class="parameter"><code><span class="type">double</span> *x_</code></em>,
<em class="parameter"><code><span class="type">double</span> *y_</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GocCanvas.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html">GtkWidget</a>
+----<a href="/usr/share/gtk-doc/html/gtk3/GtkContainer.html">GtkContainer</a>
+----<a href="/usr/share/gtk-doc/html/gtk3/GtkLayout.html">GtkLayout</a>
+----GocCanvas
</pre>
</div>
<div class="refsect1">
<a name="GocCanvas.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GocCanvas implements
AtkImplementorIface, <a href="/usr/share/gtk-doc/html/gtk3/GtkBuildable.html">GtkBuildable</a> and <a href="/usr/share/gtk-doc/html/gtk3/GtkScrollable.html">GtkScrollable</a>.</p>
</div>
<div class="refsect1">
<a name="GocCanvas.description"></a><h2>Description</h2>
<p>
The canvas widget used in gnumeric.
</p>
</div>
<div class="refsect1">
<a name="GocCanvas.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GocCanvas-struct"></a><h3>GocCanvas</h3>
<pre class="programlisting">typedef struct _GocCanvas GocCanvas;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GocCanvasClass"></a><h3>GocCanvasClass</h3>
<pre class="programlisting">typedef GtkLayoutClass GocCanvasClass;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GocDirection"></a><h3>enum GocDirection</h3>
<pre class="programlisting">typedef enum {
GOC_DIRECTION_LTR,
GOC_DIRECTION_RTL,
GOC_DIRECTION_MAX
} GocDirection;
</pre>
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<td><p><a name="GOC-DIRECTION-LTR:CAPS"></a><span class="term"><code class="literal">GOC_DIRECTION_LTR</code></span></p></td>
<td>Left to right direction
</td>
</tr>
<tr>
<td><p><a name="GOC-DIRECTION-RTL:CAPS"></a><span class="term"><code class="literal">GOC_DIRECTION_RTL</code></span></p></td>
<td>Right to left direction
</td>
</tr>
<tr>
<td><p><a name="GOC-DIRECTION-MAX:CAPS"></a><span class="term"><code class="literal">GOC_DIRECTION_MAX</code></span></p></td>
<td>First invalid value
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-c2w"></a><h3>goc_canvas_c2w ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_c2w (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>,
<em class="parameter"><code><span class="type">int</span> *x_</code></em>,
<em class="parameter"><code><span class="type">int</span> *y_</code></em>);</pre>
<p>
Retrieves the position in the widget given the canvas coordinates.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the horizontal position as a canvas coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the vertical position as a canvas coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x_</code></em> :</span></p></td>
<td>where to store the horizontal position as a widget coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y_</code></em> :</span></p></td>
<td>where to store the vertical position as a widget coordinate.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-bounds"></a><h3>goc_canvas_get_bounds ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_get_bounds (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> *x0</code></em>,
<em class="parameter"><code><span class="type">double</span> *y0</code></em>,
<em class="parameter"><code><span class="type">double</span> *x1</code></em>,
<em class="parameter"><code><span class="type">double</span> *y1</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-cur-event"></a><h3>goc_canvas_get_cur_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEvent"><span class="returnvalue">GdkEvent</span></a> * goc_canvas_get_cur_event (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEvent"><span class="type">GdkEvent</span></a> being processed. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-direction"></a><h3>goc_canvas_get_direction ()</h3>
<pre class="programlisting"><a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="returnvalue">GocDirection</span></a> goc_canvas_get_direction (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current canvas direction.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-document"></a><h3>goc_canvas_get_document ()</h3>
<pre class="programlisting"><a class="link" href="GODoc.html" title="GODoc"><span class="returnvalue">GODoc</span></a> * goc_canvas_get_document (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a class="link" href="GODoc.html" title="GODoc"><span class="type">GODoc</span></a> associated with the <a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-grabbed-item"></a><h3>goc_canvas_get_grabbed_item ()</h3>
<pre class="programlisting"><a class="link" href="GocItem.html" title="GocItem"><span class="returnvalue">GocItem</span></a> * goc_canvas_get_grabbed_item (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The currently grabbed <a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-height"></a><h3>goc_canvas_get_height ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> goc_canvas_get_height (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the height of the widget visible region.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-item-at"></a><h3>goc_canvas_get_item_at ()</h3>
<pre class="programlisting"><a class="link" href="GocItem.html" title="GocItem"><span class="returnvalue">GocItem</span></a> * goc_canvas_get_item_at (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>horizontal position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>vertical position</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a> displayed at (<em class="parameter"><code>x</code></em>,<em class="parameter"><code>y</code></em>) if any. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-pixels-per-unit"></a><h3>goc_canvas_get_pixels_per_unit ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span> goc_canvas_get_pixels_per_unit (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>how many pixels are used for each unit when displaying the canvas.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-realized"></a><h3>goc_canvas_get_realized ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> goc_canvas_get_realized (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the canvas has been realized as a <a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html"><span class="type">GtkWidget</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-root"></a><h3>goc_canvas_get_root ()</h3>
<pre class="programlisting"><a class="link" href="GocGroup.html" title="GocGroup"><span class="returnvalue">GocGroup</span></a> * goc_canvas_get_root (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the top level item of <em class="parameter"><code>canvas</code></em>, always a <a class="link" href="GocGroup.html" title="GocGroup"><span class="type">GocGroup</span></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-scroll-position"></a><h3>goc_canvas_get_scroll_position ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_get_scroll_position (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> *x</code></em>,
<em class="parameter"><code><span class="type">double</span> *y</code></em>);</pre>
<p>
Retrieves the origin of the visible region of the canvas.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>where to store the horizontal position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>where to store the vertical position</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-get-width"></a><h3>goc_canvas_get_width ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> goc_canvas_get_width (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the width of the widget visible region. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-grab-item"></a><h3>goc_canvas_grab_item ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_grab_item (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a> *item</code></em>);</pre>
<p>
Grabs <a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a>. All subsequent events will be passed to <a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a>. This
function fails if an item is already grabbed.
</p>
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<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>item</code></em> :</span></p></td>
<td><a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a></td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-invalidate"></a><h3>goc_canvas_invalidate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_invalidate (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</code></em>,
<em class="parameter"><code><span class="type">double</span> x1</code></em>,
<em class="parameter"><code><span class="type">double</span> y1</code></em>);</pre>
<p>
Invalidates a region of the canvas. The canvas will be redrawn only if
the invalidated region intersects the visible area.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
<td>minimum x coordinate of the invalidated region in canvas coordinates</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
<td>minimum y coordinate of the invalidated region in canvas coordinates</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td>maximum x coordinate of the invalidated region in canvas coordinates</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td>maximum y coordinate of the invalidated region in canvas coordinates</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-render"></a><h3>goc_canvas_render ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_render (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-t.html#cairo-t"><span class="type">cairo_t</span></a> *cr</code></em>,
<em class="parameter"><code><span class="type">double</span> x0</code></em>,
<em class="parameter"><code><span class="type">double</span> y0</code></em>,
<em class="parameter"><code><span class="type">double</span> x1</code></em>,
<em class="parameter"><code><span class="type">double</span> y1</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-scroll-to"></a><h3>goc_canvas_scroll_to ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_scroll_to (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>
Scrolls the canvas so that the origin of the visible region is at (<em class="parameter"><code>x</code></em>,<em class="parameter"><code>y</code></em>).
The origin position depends on the canvas direction (see <a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="type">GocDirection</span></a>).
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the horizontal position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the vertical position</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-set-direction"></a><h3>goc_canvas_set_direction ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_set_direction (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="type">GocDirection</span></a> direction</code></em>);</pre>
<p>
Sets the direction used by the canvas.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html#GocDirection" title="enum GocDirection"><span class="type">GocDirection</span></a></td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-set-document"></a><h3>goc_canvas_set_document ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_set_document (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><a class="link" href="GODoc.html" title="GODoc"><span class="type">GODoc</span></a> *document</code></em>);</pre>
<p>
Associates the <a class="link" href="GODoc.html" title="GODoc"><span class="type">GODoc</span></a> with the <a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a>. This is needed to use images
when filling styled items (see <a class="link" href="GocStyledItem.html" title="GocStyledItem"><span class="type">GocStyledItem</span></a>).
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>document</code></em> :</span></p></td>
<td><a class="link" href="GODoc.html" title="GODoc"><span class="type">GODoc</span></a></td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-set-pixels-per-unit"></a><h3>goc_canvas_set_pixels_per_unit ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_set_pixels_per_unit (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">double</span> pixels_per_unit</code></em>);</pre>
<p>
Sets the scale as the number of pixels used for each unit when
displaying the canvas.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pixels_per_unit</code></em> :</span></p></td>
<td>the new scale</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-ungrab-item"></a><h3>goc_canvas_ungrab_item ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_ungrab_item (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>);</pre>
<p>
Ungrabs the currently grabbed <a class="link" href="GocItem.html" title="GocItem"><span class="type">GocItem</span></a>. This function fails
if no item is grabbed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="goc-canvas-w2c"></a><h3>goc_canvas_w2c ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> goc_canvas_w2c (<em class="parameter"><code><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a> *canvas</code></em>,
<em class="parameter"><code><span class="type">int</span> x</code></em>,
<em class="parameter"><code><span class="type">int</span> y</code></em>,
<em class="parameter"><code><span class="type">double</span> *x_</code></em>,
<em class="parameter"><code><span class="type">double</span> *y_</code></em>);</pre>
<p>
Retrieves the canvas coordinates given the position in the widget.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>canvas</code></em> :</span></p></td>
<td><a class="link" href="GocCanvas.html" title="GocCanvas"><span class="type">GocCanvas</span></a></td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the horizontal position as a widget coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the vertical position as a widget coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x_</code></em> :</span></p></td>
<td>where to store the horizontal position as a canvas coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y_</code></em> :</span></p></td>
<td>where to store the vertical position as a canvas coordinate.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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