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gdk3-Points-Rectangles-and-Regions.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Points and Rectangles: GDK 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GDK 3 Reference Manual"> <link rel="up" href="reference.html" title="API Reference"> <link rel="prev" href="GdkDevicePad.html" title="GtkDevicePad"> <link rel="next" href="gdk3-Pixbufs.html" title="Pixbufs"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#gdk3-Points-Rectangles-and-Regions.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="reference.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="GdkDevicePad.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="gdk3-Pixbufs.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="gdk3-Points-Rectangles-and-Regions"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="gdk3-Points-Rectangles-and-Regions.top_of_page"></a>Points and Rectangles</span></h2> <p>Points and Rectangles — Simple graphical data types</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#gdk-rectangle-intersect" title="gdk_rectangle_intersect ()">gdk_rectangle_intersect</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#gdk-rectangle-union" title="gdk_rectangle_union ()">gdk_rectangle_union</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#gdk-rectangle-equal" title="gdk_rectangle_equal ()">gdk_rectangle_equal</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword">struct</td> <td class="function_name"><a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkPoint" title="struct GdkPoint">GdkPoint</a></td> </tr> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle">GdkRectangle</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gdk/gdk.h> </pre> </div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.description"></a><h2>Description</h2> <p>GDK provides the <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkPoint" title="struct GdkPoint"><span class="type">GdkPoint</span></a> and <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> data types for representing pixels and sets of pixels on the screen. Together with Cairo’s <a href="/usr/share/gtk-doc/html/cairo/cairo-Regions.html#cairo-region-t"><span class="type">cairo_region_t</span></a> data type, they make up the central types for representing graphical data.</p> <p>A <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkPoint" title="struct GdkPoint"><span class="type">GdkPoint</span></a> represents an x and y coordinate of a point.</p> <p>A <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> represents the position and size of a rectangle. The intersection of two rectangles can be computed with <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#gdk-rectangle-intersect" title="gdk_rectangle_intersect ()"><code class="function">gdk_rectangle_intersect()</code></a>. To find the union of two rectangles use <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#gdk-rectangle-union" title="gdk_rectangle_union ()"><code class="function">gdk_rectangle_union()</code></a>.</p> <p><a href="/usr/share/gtk-doc/html/cairo/cairo-Regions.html#cairo-region-t"><span class="type">cairo_region_t</span></a> is usually used for managing clipping of graphical operations.</p> </div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="gdk-rectangle-intersect"></a><h3>gdk_rectangle_intersect ()</h3> <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_rectangle_intersect (<em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>, <em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>, <em class="parameter"><code><a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);</pre> <p>Calculates the intersection of two rectangles. It is allowed for <em class="parameter"><code>dest</code></em> to be the same as either <em class="parameter"><code>src1</code></em> or <em class="parameter"><code>src2</code></em> . If the rectangles do not intersect, <em class="parameter"><code>dest</code></em> ’s width and height is set to 0 and its x and y values are undefined. If you are only interested in whether the rectangles intersect, but not in the intersecting area itself, pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for <em class="parameter"><code>dest</code></em> .</p> <div class="refsect3"> <a name="gdk-rectangle-intersect.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>src1</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src2</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>return location for the intersection of <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> , or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-rectangle-intersect.returns"></a><h4>Returns</h4> <p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the rectangles intersect.</p> </div> </div> <hr> <div class="refsect2"> <a name="gdk-rectangle-union"></a><h3>gdk_rectangle_union ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> gdk_rectangle_union (<em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>, <em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>, <em class="parameter"><code><a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);</pre> <p>Calculates the union of two rectangles. The union of rectangles <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> is the smallest rectangle which includes both <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> within it. It is allowed for <em class="parameter"><code>dest</code></em> to be the same as either <em class="parameter"><code>src1</code></em> or <em class="parameter"><code>src2</code></em> .</p> <p>Note that this function does not ignore 'empty' rectangles (ie. with zero width or height).</p> <div class="refsect3"> <a name="gdk-rectangle-union.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>src1</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src2</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>return location for the union of <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> . </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td> </tr> </tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="gdk-rectangle-equal"></a><h3>gdk_rectangle_equal ()</h3> <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_rectangle_equal (<em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rect1</code></em>, <em class="parameter"><code>const <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rect2</code></em>);</pre> <p>Checks if the two given rectangles are equal.</p> <div class="refsect3"> <a name="gdk-rectangle-equal.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>rect1</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>rect2</p></td> <td class="parameter_description"><p>a <a class="link" href="gdk3-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a></p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-rectangle-equal.returns"></a><h4>Returns</h4> <p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the rectangles are equal.</p> </div> <p class="since">Since: <a class="link" href="api-index-3-20.html#api-index-3.20">3.20</a></p> </div> </div> <div class="refsect1"> <a name="gdk3-Points-Rectangles-and-Regions.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GdkPoint"></a><h3>struct GdkPoint</h3> <pre class="programlisting">struct GdkPoint { gint x; gint y; }; </pre> <p>Defines the x and y coordinates of a point.</p> <div class="refsect3"> <a name="GdkPoint.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="struct_members_name"> <col class="struct_members_description"> <col width="200px" class="struct_members_annotations"> </colgroup> <tbody> <tr> <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkPoint.x"></a>x</code></em>;</p></td> <td class="struct_member_description"><p>the x coordinate of the point.</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkPoint.y"></a>y</code></em>;</p></td> <td class="struct_member_description"><p>the y coordinate of the point.</p></td> <td class="struct_member_annotations"> </td> </tr> </tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GdkRectangle"></a><h3>GdkRectangle</h3> <pre class="programlisting">typedef struct { int x, y; int width, height; } GdkRectangle; </pre> <p>Defines the position and size of a rectangle. It is identical to <a href="/usr/share/gtk-doc/html/cairo/cairo-Types.html#cairo-rectangle-int-t"><span class="type">cairo_rectangle_int_t</span></a>.</p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>