cairo-paths.xml

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

    <link linkend="CAIRO-PATH-CURVE-TO:CAPS"><literal>CAIRO_PATH_CURVE_TO</literal></link>:    3 points
    <link linkend="CAIRO-PATH-CLOSE-PATH:CAPS"><literal>CAIRO_PATH_CLOSE_PATH</literal></link>:  0 points
</programlisting>
</para>
<para>
The semantics and ordering of the coordinate values are consistent
with <link linkend="cairo-move-to"><function>cairo_move_to()</function></link>, <link linkend="cairo-line-to"><function>cairo_line_to()</function></link>, <link linkend="cairo-curve-to"><function>cairo_curve_to()</function></link>, and
<link linkend="cairo-close-path"><function>cairo_close_path()</function></link>.
</para>
<para>
Here is sample code for iterating through a <link linkend="cairo-path-t--"><type>cairo_path_t:</type></link>
</para>
<para>
<informalexample><programlisting>
     int i;
     cairo_path_t *path;
     cairo_path_data_t *data;
&nbsp;
     path = cairo_copy_path (cr);
&nbsp;
     for (i=0; i &lt; path->num_data; i += path->data[i].header.length) {
         data = &amp;path->data[i];
         switch (data->header.type) {
         case CAIRO_PATH_MOVE_TO:
             do_move_to_things (data[1].point.x, data[1].point.y);
             break;
         case CAIRO_PATH_LINE_TO:
             do_line_to_things (data[1].point.x, data[1].point.y);
             break;
         case CAIRO_PATH_CURVE_TO:
             do_curve_to_things (data[1].point.x, data[1].point.y,
                                 data[2].point.x, data[2].point.y,
                                 data[3].point.x, data[3].point.y);
             break;
         case CAIRO_PATH_CLOSE_PATH:
             <link linkend="do-close-path-things"><function>do_close_path_things()</function></link>;
             break;
         }
     }
     cairo_path_destroy (path);
</programlisting></informalexample></para>
<para>

</para></refsect2>
<refsect2>
<title><anchor id="cairo-path-data-type-t" role="enum"/>enum cairo_path_data_type_t</title>
<indexterm><primary>cairo_path_data_type_t</primary></indexterm><programlisting>typedef enum _cairo_path_data_type {
    CAIRO_PATH_MOVE_TO,
    CAIRO_PATH_LINE_TO,
    CAIRO_PATH_CURVE_TO,
    CAIRO_PATH_CLOSE_PATH
} cairo_path_data_type_t;
</programlisting>
<para>

</para></refsect2>
<refsect2>
<title><anchor id="cairo-copy-path" role="function"/>cairo_copy_path ()</title>
<indexterm><primary>cairo_copy_path</primary></indexterm><programlisting><link linkend="cairo-path-t">cairo_path_t</link>* cairo_copy_path               (<link linkend="cairo-t">cairo_t</link> *cr);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-copy-path-flat" role="function"/>cairo_copy_path_flat ()</title>
<indexterm><primary>cairo_copy_path_flat</primary></indexterm><programlisting><link linkend="cairo-path-t">cairo_path_t</link>* cairo_copy_path_flat          (<link linkend="cairo-t">cairo_t</link> *cr);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-path-destroy" role="function"/>cairo_path_destroy ()</title>
<indexterm><primary>cairo_path_destroy</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_path_destroy              (<link linkend="cairo-path-t">cairo_path_t</link> *path);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-append-path" role="function"/>cairo_append_path ()</title>
<indexterm><primary>cairo_append_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_append_path               (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="cairo-path-t">cairo_path_t</link> *path);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-get-current-point" role="function"/>cairo_get_current_point ()</title>
<indexterm><primary>cairo_get_current_point</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_get_current_point         (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> *x,
                                             <link linkend="double">double</link> *y);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-new-path" role="function"/>cairo_new_path ()</title>
<indexterm><primary>cairo_new_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_new_path                  (<link linkend="cairo-t">cairo_t</link> *cr);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-new-sub-path" role="function" condition="since:1.2"/>cairo_new_sub_path ()</title>
<indexterm role="1.2"><primary>cairo_new_sub_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_new_sub_path              (<link linkend="cairo-t">cairo_t</link> *cr);</programlisting>
<para>Since  1.2
</para></refsect2>
<refsect2>
<title><anchor id="cairo-close-path" role="function"/>cairo_close_path ()</title>
<indexterm><primary>cairo_close_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_close_path                (<link linkend="cairo-t">cairo_t</link> *cr);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-arc" role="function"/>cairo_arc ()</title>
<indexterm><primary>cairo_arc</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_arc                       (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> xc,
                                             <link linkend="double">double</link> yc,
                                             <link linkend="double">double</link> radius,
                                             <link linkend="double">double</link> angle1,
                                             <link linkend="double">double</link> angle2);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-arc-negative" role="function"/>cairo_arc_negative ()</title>
<indexterm><primary>cairo_arc_negative</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_arc_negative              (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> xc,
                                             <link linkend="double">double</link> yc,
                                             <link linkend="double">double</link> radius,
                                             <link linkend="double">double</link> angle1,
                                             <link linkend="double">double</link> angle2);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-curve-to" role="function"/>cairo_curve_to ()</title>
<indexterm><primary>cairo_curve_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_curve_to                  (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> x1,
                                             <link linkend="double">double</link> y1,
                                             <link linkend="double">double</link> x2,
                                             <link linkend="double">double</link> y2,
                                             <link linkend="double">double</link> x3,
                                             <link linkend="double">double</link> y3);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-line-to" role="function"/>cairo_line_to ()</title>
<indexterm><primary>cairo_line_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_line_to                   (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> x,
                                             <link linkend="double">double</link> y);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-move-to" role="function"/>cairo_move_to ()</title>
<indexterm><primary>cairo_move_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_move_to                   (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> x,
                                             <link linkend="double">double</link> y);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-rectangle" role="function"/>cairo_rectangle ()</title>
<indexterm><primary>cairo_rectangle</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_rectangle                 (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> x,
                                             <link linkend="double">double</link> y,
                                             <link linkend="double">double</link> width,
                                             <link linkend="double">double</link> height);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-glyph-path" role="function"/>cairo_glyph_path ()</title>
<indexterm><primary>cairo_glyph_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_glyph_path                (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="cairo-glyph-t">cairo_glyph_t</link> *glyphs,
                                             <link linkend="int">int</link> num_glyphs);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-text-path" role="function"/>cairo_text_path ()</title>
<indexterm><primary>cairo_text_path</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_text_path                 (<link linkend="cairo-t">cairo_t</link> *cr,
                                             const <link linkend="char">char</link> *utf8);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-rel-curve-to" role="function"/>cairo_rel_curve_to ()</title>
<indexterm><primary>cairo_rel_curve_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_rel_curve_to              (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> dx1,
                                             <link linkend="double">double</link> dy1,
                                             <link linkend="double">double</link> dx2,
                                             <link linkend="double">double</link> dy2,
                                             <link linkend="double">double</link> dx3,
                                             <link linkend="double">double</link> dy3);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-rel-line-to" role="function"/>cairo_rel_line_to ()</title>
<indexterm><primary>cairo_rel_line_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_rel_line_to               (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> dx,
                                             <link linkend="double">double</link> dy);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-rel-move-to" role="function"/>cairo_rel_move_to ()</title>
<indexterm><primary>cairo_rel_move_to</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_rel_move_to               (<link linkend="cairo-t">cairo_t</link> *cr,
                                             <link linkend="double">double</link> dx,
                                             <link linkend="double">double</link> dy);</programlisting>
</refsect2>

</refsect1>




</refentry>