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  24 <a href="#gtk3-GtkGradient.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gtk3-GtkGradient.description" class="shortcut">Description</a>
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  29 <div class="refentry">
  30 <a name="gtk3-GtkGradient"></a><div class="titlepage"></div>
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  32 <td valign="top">
  33 <h2><span class="refentrytitle"><a name="gtk3-GtkGradient.top_of_page"></a>GtkGradient</span></h2>
  34 <p>GtkGradient — Gradients</p>
  35 </td>
  36 <td valign="top" align="right"></td>
  37 </tr></table></div>
  38 <div class="refsynopsisdiv">
  39 <a name="gtk3-GtkGradient.synopsis"></a><h2>Synopsis</h2>
  40 <pre class="synopsis">
  41 #include &lt;gtk/gtk.h&gt;
  42
  43                     <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient">GtkGradient</a>;
  44 <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-new-linear" title="gtk_gradient_new_linear ()">gtk_gradient_new_linear</a>             (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x0</code></em>,
  45                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y0</code></em>,
  46                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x1</code></em>,
  47                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y1</code></em>);
  48 <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-new-radial" title="gtk_gradient_new_radial ()">gtk_gradient_new_radial</a>             (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x0</code></em>,
  49                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y0</code></em>,
  50                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius0</code></em>,
  51                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x1</code></em>,
  52                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y1</code></em>,
  53                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius1</code></em>);
  54 <span class="returnvalue">void</span>                <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-add-color-stop" title="gtk_gradient_add_color_stop ()">gtk_gradient_add_color_stop</a>         (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>,
  55                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> offset</code></em>,
  56                                                          <em class="parameter"><code><a class="link" href="gtk3-GtkSymbolicColor.html#GtkSymbolicColor" title="GtkSymbolicColor"><span class="type">GtkSymbolicColor</span></a> *color</code></em>);
  57 <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-ref" title="gtk_gradient_ref ()">gtk_gradient_ref</a>                    (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);
  58 <span class="returnvalue">void</span>                <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-unref" title="gtk_gradient_unref ()">gtk_gradient_unref</a>                  (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);
  59 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-resolve" title="gtk_gradient_resolve ()">gtk_gradient_resolve</a>                (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>,
  60                                                          <em class="parameter"><code><a class="link" href="gtk3-GtkStyleProperties.html#GtkStyleProperties" title="struct GtkStyleProperties"><span class="type">GtkStyleProperties</span></a> *props</code></em>,
  61                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-pattern-t.html#cairo-pattern-t"><span class="type">cairo_pattern_t</span></a> **resolved_gradient</code></em>);
  62 <span class="returnvalue">char</span> *              <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-to-string" title="gtk_gradient_to_string ()">gtk_gradient_to_string</a>              (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);
  63 </pre>
  64 </div>
  65 <div class="refsect1">
  66 <a name="gtk3-GtkGradient.description"></a><h2>Description</h2>
  67 <p>
  68 GtkGradient is a boxed type that represents a gradient.
  69 It is the result of parsing a
  70 <a class="link" href="GtkCssProvider.html#gtkcssprovider-gradients" title="Gradients">gradient expression</a>.
  71 To obtain the gradient represented by a GtkGradient, it has to
  72 be resolved with <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-resolve" title="gtk_gradient_resolve ()"><code class="function">gtk_gradient_resolve()</code></a>, which replaces all
  73 symbolic color references by the colors they refer to (in a given
  74 context) and constructs a <a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-pattern-t.html#cairo-pattern-t"><span class="type">cairo_pattern_t</span></a> value.
  75 </p>
  76 <p>
  77 It is not normally necessary to deal directly with <a href="gtk3-GtkGradient.html#GtkGradient"><span class="type">GtkGradients</span></a>,
  78 since they are mostly used behind the scenes by <a class="link" href="GtkStyleContext.html" title="GtkStyleContext"><span class="type">GtkStyleContext</span></a> and
  79 <a class="link" href="GtkCssProvider.html" title="GtkCssProvider"><span class="type">GtkCssProvider</span></a>.
  80 </p>
  81 </div>
  82 <div class="refsect1">
  83 <a name="gtk3-GtkGradient.details"></a><h2>Details</h2>
  84 <div class="refsect2">
  85 <a name="GtkGradient"></a><h3>GtkGradient</h3>
  86 <pre class="programlisting">typedef struct _GtkGradient GtkGradient;</pre>
  87 </div>
  88 <hr>
  89 <div class="refsect2">
  90 <a name="gtk-gradient-new-linear"></a><h3>gtk_gradient_new_linear ()</h3>
  91 <pre class="programlisting"><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       gtk_gradient_new_linear             (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x0</code></em>,
  92                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y0</code></em>,
  93                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x1</code></em>,
  94                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y1</code></em>);</pre>
  95 <p>
  96 Creates a new linear gradient along the line defined by (x0, y0) and (x1, y1). Before using the gradient
  97 a number of stop colors must be added through <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-add-color-stop" title="gtk_gradient_add_color_stop ()"><code class="function">gtk_gradient_add_color_stop()</code></a>.
  98 </p>
  99 <div class="variablelist"><table border="0">
 100 <col align="left" valign="top">
 101 <tbody>
 102 <tr>
 103 <td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
 104 <td>X coordinate of the starting point</td>
 105 </tr>
 106 <tr>
 107 <td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
 108 <td>Y coordinate of the starting point</td>
 109 </tr>
 110 <tr>
 111 <td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
 112 <td>X coordinate of the end point</td>
 113 </tr>
 114 <tr>
 115 <td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
 116 <td>Y coordinate of the end point</td>
 117 </tr>
 118 <tr>
 119 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 120 <td>A newly created <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 121 </td>
 122 </tr>
 123 </tbody>
 124 </table></div>
 125 <p class="since">Since 3.0</p>
 126 </div>
 127 <hr>
 128 <div class="refsect2">
 129 <a name="gtk-gradient-new-radial"></a><h3>gtk_gradient_new_radial ()</h3>
 130 <pre class="programlisting"><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       gtk_gradient_new_radial             (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x0</code></em>,
 131                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y0</code></em>,
 132                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius0</code></em>,
 133                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x1</code></em>,
 134                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y1</code></em>,
 135                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius1</code></em>);</pre>
 136 <p>
 137 Creates a new radial gradient along the two circles defined by (x0, y0, radius0) and
 138 (x1, y1, radius1). Before using the gradient a number of stop colors must be added
 139 through <a class="link" href="gtk3-GtkGradient.html#gtk-gradient-add-color-stop" title="gtk_gradient_add_color_stop ()"><code class="function">gtk_gradient_add_color_stop()</code></a>.
 140 </p>
 141 <div class="variablelist"><table border="0">
 142 <col align="left" valign="top">
 143 <tbody>
 144 <tr>
 145 <td><p><span class="term"><em class="parameter"><code>x0</code></em> :</span></p></td>
 146 <td>X coordinate of the start circle</td>
 147 </tr>
 148 <tr>
 149 <td><p><span class="term"><em class="parameter"><code>y0</code></em> :</span></p></td>
 150 <td>Y coordinate of the start circle</td>
 151 </tr>
 152 <tr>
 153 <td><p><span class="term"><em class="parameter"><code>radius0</code></em> :</span></p></td>
 154 <td>radius of the start circle</td>
 155 </tr>
 156 <tr>
 157 <td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
 158 <td>X coordinate of the end circle</td>
 159 </tr>
 160 <tr>
 161 <td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
 162 <td>Y coordinate of the end circle</td>
 163 </tr>
 164 <tr>
 165 <td><p><span class="term"><em class="parameter"><code>radius1</code></em> :</span></p></td>
 166 <td>radius of the end circle</td>
 167 </tr>
 168 <tr>
 169 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 170 <td>A newly created <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 171 </td>
 172 </tr>
 173 </tbody>
 174 </table></div>
 175 <p class="since">Since 3.0</p>
 176 </div>
 177 <hr>
 178 <div class="refsect2">
 179 <a name="gtk-gradient-add-color-stop"></a><h3>gtk_gradient_add_color_stop ()</h3>
 180 <pre class="programlisting"><span class="returnvalue">void</span>                gtk_gradient_add_color_stop         (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>,
 181                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> offset</code></em>,
 182                                                          <em class="parameter"><code><a class="link" href="gtk3-GtkSymbolicColor.html#GtkSymbolicColor" title="GtkSymbolicColor"><span class="type">GtkSymbolicColor</span></a> *color</code></em>);</pre>
 183 <p>
 184 Adds a stop color to <em class="parameter"><code>gradient</code></em>.
 185 </p>
 186 <div class="variablelist"><table border="0">
 187 <col align="left" valign="top">
 188 <tbody>
 189 <tr>
 190 <td><p><span class="term"><em class="parameter"><code>gradient</code></em> :</span></p></td>
 191 <td>a <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 192 </td>
 193 </tr>
 194 <tr>
 195 <td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
 196 <td>offset for the color stop</td>
 197 </tr>
 198 <tr>
 199 <td><p><span class="term"><em class="parameter"><code>color</code></em> :</span></p></td>
 200 <td>color to use</td>
 201 </tr>
 202 </tbody>
 203 </table></div>
 204 <p class="since">Since 3.0</p>
 205 </div>
 206 <hr>
 207 <div class="refsect2">
 208 <a name="gtk-gradient-ref"></a><h3>gtk_gradient_ref ()</h3>
 209 <pre class="programlisting"><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="returnvalue">GtkGradient</span></a> *       gtk_gradient_ref                    (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);</pre>
 210 <p>
 211 Increases the reference count of <em class="parameter"><code>gradient</code></em>.
 212 </p>
 213 <div class="variablelist"><table border="0">
 214 <col align="left" valign="top">
 215 <tbody>
 216 <tr>
 217 <td><p><span class="term"><em class="parameter"><code>gradient</code></em> :</span></p></td>
 218 <td>a <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 219 </td>
 220 </tr>
 221 <tr>
 222 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 223 <td>The same <em class="parameter"><code>gradient</code></em>
 224 </td>
 225 </tr>
 226 </tbody>
 227 </table></div>
 228 <p class="since">Since 3.0</p>
 229 </div>
 230 <hr>
 231 <div class="refsect2">
 232 <a name="gtk-gradient-unref"></a><h3>gtk_gradient_unref ()</h3>
 233 <pre class="programlisting"><span class="returnvalue">void</span>                gtk_gradient_unref                  (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);</pre>
 234 <p>
 235 Decreases the reference count of <em class="parameter"><code>gradient</code></em>, freeing its memory
 236 if the reference count reaches 0.
 237 </p>
 238 <div class="variablelist"><table border="0">
 239 <col align="left" valign="top">
 240 <tbody><tr>
 241 <td><p><span class="term"><em class="parameter"><code>gradient</code></em> :</span></p></td>
 242 <td>a <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 243 </td>
 244 </tr></tbody>
 245 </table></div>
 246 <p class="since">Since 3.0</p>
 247 </div>
 248 <hr>
 249 <div class="refsect2">
 250 <a name="gtk-gradient-resolve"></a><h3>gtk_gradient_resolve ()</h3>
 251 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gtk_gradient_resolve                (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>,
 252                                                          <em class="parameter"><code><a class="link" href="gtk3-GtkStyleProperties.html#GtkStyleProperties" title="struct GtkStyleProperties"><span class="type">GtkStyleProperties</span></a> *props</code></em>,
 253                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-pattern-t.html#cairo-pattern-t"><span class="type">cairo_pattern_t</span></a> **resolved_gradient</code></em>);</pre>
 254 <p>
 255 If <em class="parameter"><code>gradient</code></em> is resolvable, <em class="parameter"><code>resolved_gradient</code></em> will be filled in
 256 with the resolved gradient as a cairo_pattern_t, and <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> will
 257 be returned. Generally, if <em class="parameter"><code>gradient</code></em> can't be resolved, it is
 258 due to it being defined on top of a named color that doesn't
 259 exist in <em class="parameter"><code>props</code></em>.
 260 </p>
 261 <div class="variablelist"><table border="0">
 262 <col align="left" valign="top">
 263 <tbody>
 264 <tr>
 265 <td><p><span class="term"><em class="parameter"><code>gradient</code></em> :</span></p></td>
 266 <td>a <a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a>
 267 </td>
 268 </tr>
 269 <tr>
 270 <td><p><span class="term"><em class="parameter"><code>props</code></em> :</span></p></td>
 271 <td>
 272 <a class="link" href="gtk3-GtkStyleProperties.html#GtkStyleProperties" title="struct GtkStyleProperties"><span class="type">GtkStyleProperties</span></a> to use when resolving named colors</td>
 273 </tr>
 274 <tr>
 275 <td><p><span class="term"><em class="parameter"><code>resolved_gradient</code></em> :</span></p></td>
 276 <td>return location for the resolved pattern. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
 277 </td>
 278 </tr>
 279 <tr>
 280 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 281 <td>
 282 <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the gradient has been resolved</td>
 283 </tr>
 284 </tbody>
 285 </table></div>
 286 <p class="since">Since 3.0</p>
 287 </div>
 288 <hr>
 289 <div class="refsect2">
 290 <a name="gtk-gradient-to-string"></a><h3>gtk_gradient_to_string ()</h3>
 291 <pre class="programlisting"><span class="returnvalue">char</span> *              gtk_gradient_to_string              (<em class="parameter"><code><a class="link" href="gtk3-GtkGradient.html#GtkGradient" title="GtkGradient"><span class="type">GtkGradient</span></a> *gradient</code></em>);</pre>
 292 <p>
 293 Creates a string representation for <em class="parameter"><code>gradient</code></em> that is suitable
 294 for using in GTK CSS files.
 295 </p>
 296 <div class="variablelist"><table border="0">
 297 <col align="left" valign="top">
 298 <tbody>
 299 <tr>
 300 <td><p><span class="term"><em class="parameter"><code>gradient</code></em> :</span></p></td>
 301 <td>the gradient to print</td>
 302 </tr>
 303 <tr>
 304 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 305 <td>A string representation for <em class="parameter"><code>gradient</code></em>
 306 </td>
 307 </tr>
 308 </tbody>
 309 </table></div>
 310 </div>
 311 </div>
 312 </div>
 313 <div class="footer">
 314 <hr>
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