cairo-paths.html

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

<a href="cairo-Paths.html#cairo-close-path"><code class="function">cairo_close_path()</code></a>.
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Here is sample code for iterating through a <span class="type">cairo_path_t:</span>
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<div class="informalexample"><pre class="programlisting">
     int i;
     cairo_path_t *path;
     cairo_path_data_t *data;
&#160;
     path = cairo_copy_path (cr);
&#160;
     for (i=0; i &lt; path-&gt;num_data; i += path-&gt;data[i].header.length) {
         data = &amp;path-&gt;data[i];
         switch (data-&gt;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:
             <code class="function">do_close_path_things()</code>;
             break;
         }
     }
     cairo_path_destroy (path);
</pre></div>
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<div class="refsect2" lang="en">
<a name="id2566664"></a><h3>
<a name="cairo-path-data-type-t"></a>enum cairo_path_data_type_t</h3>
<a class="indexterm" name="id2554979"></a><pre class="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;
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<div class="refsect2" lang="en">
<a name="id2530940"></a><h3>
<a name="cairo-copy-path"></a>cairo_copy_path ()</h3>
<a class="indexterm" name="id2530952"></a><pre class="programlisting"><a href="cairo-Paths.html#cairo-path-t">cairo_path_t</a>* cairo_copy_path               (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
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<div class="refsect2" lang="en">
<a name="id2530976"></a><h3>
<a name="cairo-copy-path-flat"></a>cairo_copy_path_flat ()</h3>
<a class="indexterm" name="id2530987"></a><pre class="programlisting"><a href="cairo-Paths.html#cairo-path-t">cairo_path_t</a>* cairo_copy_path_flat          (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
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<div class="refsect2" lang="en">
<a name="id2531011"></a><h3>
<a name="cairo-path-destroy"></a>cairo_path_destroy ()</h3>
<a class="indexterm" name="id2531023"></a><pre class="programlisting">void        cairo_path_destroy              (<a href="cairo-Paths.html#cairo-path-t">cairo_path_t</a> *path);</pre>
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<div class="refsect2" lang="en">
<a name="id2531047"></a><h3>
<a name="cairo-append-path"></a>cairo_append_path ()</h3>
<a class="indexterm" name="id2531059"></a><pre class="programlisting">void        cairo_append_path               (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-Paths.html#cairo-path-t">cairo_path_t</a> *path);</pre>
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<div class="refsect2" lang="en">
<a name="id2531089"></a><h3>
<a name="cairo-get-current-point"></a>cairo_get_current_point ()</h3>
<a class="indexterm" name="id2531101"></a><pre class="programlisting">void        cairo_get_current_point         (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double *x,
                                             double *y);</pre>
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<div class="refsect2" lang="en">
<a name="id2531137"></a><h3>
<a name="cairo-new-path"></a>cairo_new_path ()</h3>
<a class="indexterm" name="id2531150"></a><pre class="programlisting">void        cairo_new_path                  (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
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<div class="refsect2" lang="en">
<a name="id2531174"></a><h3>
<a name="cairo-new-sub-path"></a>cairo_new_sub_path ()</h3>
<a class="indexterm" name="id2531189"></a><pre class="programlisting">void        cairo_new_sub_path              (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
<p>Since  1.2
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<div class="refsect2" lang="en">
<a name="id2531218"></a><h3>
<a name="cairo-close-path"></a>cairo_close_path ()</h3>
<a class="indexterm" name="id2531230"></a><pre class="programlisting">void        cairo_close_path                (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
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<div class="refsect2" lang="en">
<a name="id2531255"></a><h3>
<a name="cairo-arc"></a>cairo_arc ()</h3>
<a class="indexterm" name="id2531267"></a><pre class="programlisting">void        cairo_arc                       (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double xc,
                                             double yc,
                                             double radius,
                                             double angle1,
                                             double angle2);</pre>
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<div class="refsect2" lang="en">
<a name="id2531325"></a><h3>
<a name="cairo-arc-negative"></a>cairo_arc_negative ()</h3>
<a class="indexterm" name="id2531337"></a><pre class="programlisting">void        cairo_arc_negative              (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double xc,
                                             double yc,
                                             double radius,
                                             double angle1,
                                             double angle2);</pre>
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<div class="refsect2" lang="en">
<a name="id2531395"></a><h3>
<a name="cairo-curve-to"></a>cairo_curve_to ()</h3>
<a class="indexterm" name="id2531407"></a><pre class="programlisting">void        cairo_curve_to                  (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double x1,
                                             double y1,
                                             double x2,
                                             double y2,
                                             double x3,
                                             double y3);</pre>
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<div class="refsect2" lang="en">
<a name="id2531472"></a><h3>
<a name="cairo-line-to"></a>cairo_line_to ()</h3>
<a class="indexterm" name="id2531484"></a><pre class="programlisting">void        cairo_line_to                   (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double x,
                                             double y);</pre>
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<div class="refsect2" lang="en">
<a name="id2531522"></a><h3>
<a name="cairo-move-to"></a>cairo_move_to ()</h3>
<a class="indexterm" name="id2531534"></a><pre class="programlisting">void        cairo_move_to                   (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double x,
                                             double y);</pre>
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<div class="refsect2" lang="en">
<a name="id2531572"></a><h3>
<a name="cairo-rectangle"></a>cairo_rectangle ()</h3>
<a class="indexterm" name="id2531585"></a><pre class="programlisting">void        cairo_rectangle                 (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double x,
                                             double y,
                                             double width,
                                             double height);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2531636"></a><h3>
<a name="cairo-glyph-path"></a>cairo_glyph_path ()</h3>
<a class="indexterm" name="id2531648"></a><pre class="programlisting">void        cairo_glyph_path                (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-Text.html#cairo-glyph-t">cairo_glyph_t</a> *glyphs,
                                             int num_glyphs);</pre>
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<div class="refsect2" lang="en">
<a name="id2531687"></a><h3>
<a name="cairo-text-path"></a>cairo_text_path ()</h3>
<a class="indexterm" name="id2531699"></a><pre class="programlisting">void        cairo_text_path                 (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             const char *utf8);</pre>
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<div class="refsect2" lang="en">
<a name="id2531731"></a><h3>
<a name="cairo-rel-curve-to"></a>cairo_rel_curve_to ()</h3>
<a class="indexterm" name="id2531743"></a><pre class="programlisting">void        cairo_rel_curve_to              (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double dx1,
                                             double dy1,
                                             double dx2,
                                             double dy2,
                                             double dx3,
                                             double dy3);</pre>
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<hr>
<div class="refsect2" lang="en">
<a name="id2576064"></a><h3>
<a name="cairo-rel-line-to"></a>cairo_rel_line_to ()</h3>
<a class="indexterm" name="id2576074"></a><pre class="programlisting">void        cairo_rel_line_to               (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double dx,
                                             double dy);</pre>
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<div class="refsect2" lang="en">
<a name="id2576108"></a><h3>
<a name="cairo-rel-move-to"></a>cairo_rel_move_to ()</h3>
<a class="indexterm" name="id2576119"></a><pre class="programlisting">void        cairo_rel_move_to               (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double dx,
                                             double dy);</pre>
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