cairo-cairo-t.html

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

<a name="id2573915"></a><h3>
<a name="cairo-pop-group"></a>cairo_pop_group ()</h3>
<a class="indexterm" name="id2573929"></a><pre class="programlisting"><a href="cairo-Patterns.html#cairo-pattern-t">cairo_pattern_t</a>* cairo_pop_group            (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
<p>Since  1.2
</p>
</div>
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<div class="refsect2" lang="en">
<a name="id2573959"></a><h3>
<a name="cairo-pop-group-to-source"></a>cairo_pop_group_to_source ()</h3>
<a class="indexterm" name="id2573973"></a><pre class="programlisting">void        cairo_pop_group_to_source       (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
<p>Since  1.2
</p>
</div>
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<div class="refsect2" lang="en">
<a name="id2574002"></a><h3>
<a name="cairo-get-group-target"></a>cairo_get_group_target ()</h3>
<a class="indexterm" name="id2574015"></a><pre class="programlisting"><a href="cairo-cairo-surface-t.html#cairo-surface-t">cairo_surface_t</a>* cairo_get_group_target     (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
<p>Since  1.2
</p>
</div>
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<div class="refsect2" lang="en">
<a name="id2574044"></a><h3>
<a name="cairo-set-source-rgb"></a>cairo_set_source_rgb ()</h3>
<a class="indexterm" name="id2574055"></a><pre class="programlisting">void        cairo_set_source_rgb            (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double red,
                                             double green,
                                             double blue);</pre>
</div>
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<div class="refsect2" lang="en">
<a name="id2574099"></a><h3>
<a name="cairo-set-source-rgba"></a>cairo_set_source_rgba ()</h3>
<a class="indexterm" name="id2574111"></a><pre class="programlisting">void        cairo_set_source_rgba           (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double red,
                                             double green,
                                             double blue,
                                             double alpha);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574162"></a><h3>
<a name="cairo-set-source"></a>cairo_set_source ()</h3>
<a class="indexterm" name="id2574174"></a><pre class="programlisting">void        cairo_set_source                (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-Patterns.html#cairo-pattern-t">cairo_pattern_t</a> *source);</pre>
</div>
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<div class="refsect2" lang="en">
<a name="id2574206"></a><h3>
<a name="cairo-set-source-surface"></a>cairo_set_source_surface ()</h3>
<a class="indexterm" name="id2574217"></a><pre class="programlisting">void        cairo_set_source_surface        (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-cairo-surface-t.html#cairo-surface-t">cairo_surface_t</a> *surface,
                                             double x,
                                             double y);</pre>
</div>
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<div class="refsect2" lang="en">
<a name="id2574261"></a><h3>
<a name="cairo-get-source"></a>cairo_get_source ()</h3>
<a class="indexterm" name="id2574274"></a><pre class="programlisting"><a href="cairo-Patterns.html#cairo-pattern-t">cairo_pattern_t</a>* cairo_get_source           (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
</div>
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<div class="refsect2" lang="en">
<a name="id2574298"></a><h3>
<a name="cairo-antialias-t"></a>enum cairo_antialias_t</h3>
<a class="indexterm" name="id2574311"></a><pre class="programlisting">typedef enum _cairo_antialias {
    CAIRO_ANTIALIAS_DEFAULT,
    CAIRO_ANTIALIAS_NONE,
    CAIRO_ANTIALIAS_GRAY,
    CAIRO_ANTIALIAS_SUBPIXEL
} cairo_antialias_t;
</pre>
<p>
Specifies the type of antialiasing to do when rendering text or shapes.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><a name="CAIRO-ANTIALIAS-DEFAULT:CAPS"></a><code class="literal">CAIRO_ANTIALIAS_DEFAULT</code></span></td>
<td> Use the default antialiasing for
  the subsystem and target device
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-ANTIALIAS-NONE:CAPS"></a><code class="literal">CAIRO_ANTIALIAS_NONE</code></span></td>
<td> Use a bilevel alpha mask
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-ANTIALIAS-GRAY:CAPS"></a><code class="literal">CAIRO_ANTIALIAS_GRAY</code></span></td>
<td> Perform single-color antialiasing (using
 shades of gray for black text on a white background, for example).
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-ANTIALIAS-SUBPIXEL:CAPS"></a><code class="literal">CAIRO_ANTIALIAS_SUBPIXEL</code></span></td>
<td> Perform antialiasing by taking
 advantage of the order of subpixel elements on devices
 such as LCD panels
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574428"></a><h3>
<a name="cairo-set-antialias"></a>cairo_set_antialias ()</h3>
<a class="indexterm" name="id2574441"></a><pre class="programlisting">void        cairo_set_antialias             (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-cairo-t.html#cairo-antialias-t">cairo_antialias_t</a> antialias);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574472"></a><h3>
<a name="cairo-get-antialias"></a>cairo_get_antialias ()</h3>
<a class="indexterm" name="id2574484"></a><pre class="programlisting"><a href="cairo-cairo-t.html#cairo-antialias-t">cairo_antialias_t</a> cairo_get_antialias       (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
</div>
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<div class="refsect2" lang="en">
<a name="id2574508"></a><h3>
<a name="cairo-set-dash"></a>cairo_set_dash ()</h3>
<a class="indexterm" name="id2574520"></a><pre class="programlisting">void        cairo_set_dash                  (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             double *dashes,
                                             int num_dashes,
                                             double offset);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574565"></a><h3>
<a name="cairo-fill-rule-t"></a>enum cairo_fill_rule_t</h3>
<a class="indexterm" name="id2574578"></a><pre class="programlisting">typedef enum _cairo_fill_rule {
    CAIRO_FILL_RULE_WINDING,
    CAIRO_FILL_RULE_EVEN_ODD
} cairo_fill_rule_t;
</pre>
<p>
<a href="cairo-cairo-t.html#cairo-fill-rule-t"><span class="type">cairo_fill_rule_t</span></a> is used to select how paths are filled. For both
fill rules, whether or not a point is included in the fill is
determined by taking a ray from that point to infinity and looking
at intersections with the path. The ray can be in any direction,
as long as it doesn't pass through the end point of a segment
or have a tricky intersection such as intersecting tangent to the path.
(Note that filling is not actually implemented in this way. This
is just a description of the rule that is applied.)</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><a name="CAIRO-FILL-RULE-WINDING:CAPS"></a><code class="literal">CAIRO_FILL_RULE_WINDING</code></span></td>
<td> If the path crosses the ray from
left-to-right, counts +1. If the path crosses the ray
from right to left, counts -1. (Left and right are determined
from the perspective of looking along the ray from the starting
point.) If the total count is non-zero, the point will be filled.
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-FILL-RULE-EVEN-ODD:CAPS"></a><code class="literal">CAIRO_FILL_RULE_EVEN_ODD</code></span></td>
<td> Counts the total number of
intersections, without regard to the orientation of the contour. If
the total number of intersections is odd, the point will be
filled.
</td>
</tr>
</tbody>
</table></div>
</div>
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<div class="refsect2" lang="en">
<a name="id2574670"></a><h3>
<a name="cairo-set-fill-rule"></a>cairo_set_fill_rule ()</h3>
<a class="indexterm" name="id2574683"></a><pre class="programlisting">void        cairo_set_fill_rule             (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-cairo-t.html#cairo-fill-rule-t">cairo_fill_rule_t</a> fill_rule);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574714"></a><h3>
<a name="cairo-get-fill-rule"></a>cairo_get_fill_rule ()</h3>
<a class="indexterm" name="id2574726"></a><pre class="programlisting"><a href="cairo-cairo-t.html#cairo-fill-rule-t">cairo_fill_rule_t</a> cairo_get_fill_rule       (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574750"></a><h3>
<a name="cairo-line-cap-t"></a>enum cairo_line_cap_t</h3>
<a class="indexterm" name="id2574762"></a><pre class="programlisting">typedef enum _cairo_line_cap {
    CAIRO_LINE_CAP_BUTT,
    CAIRO_LINE_CAP_ROUND,
    CAIRO_LINE_CAP_SQUARE
} cairo_line_cap_t;
</pre>
<p>
enumeration for style of line-endings</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><a name="CAIRO-LINE-CAP-BUTT:CAPS"></a><code class="literal">CAIRO_LINE_CAP_BUTT</code></span></td>
<td> start(stop) the line exactly at the start(end) point
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-LINE-CAP-ROUND:CAPS"></a><code class="literal">CAIRO_LINE_CAP_ROUND</code></span></td>
<td> use a round ending, the center of the circle is the end point
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-LINE-CAP-SQUARE:CAPS"></a><code class="literal">CAIRO_LINE_CAP_SQUARE</code></span></td>
<td> use squared ending, the center of the square is the end point
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2574852"></a><h3>
<a name="cairo-set-line-cap"></a>cairo_set_line_cap ()</h3>
<a class="indexterm" name="id2574865"></a><pre class="programlisting">void        cairo_set_line_cap              (<a href="cairo-cairo-t.html#cairo-t">cairo_t</a> *cr,
                                             <a href="cairo-cairo-t.html#cairo-line-cap-t">cairo_line_cap_t</a> line_cap);</pre>