pango-glyph-storage.html

GTK+-2.0源码之pango-1.15.6.tar.gz

</pre></div>
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</p>
<p>Since  1.6
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<div class="refsect2" lang="en">
<a name="id2771258"></a><h3>
<a name="pango-matrix-copy"></a>pango_matrix_copy ()</h3>
<a class="indexterm" name="id2771273"></a><pre class="programlisting"><a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a>* pango_matrix_copy              (const <a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix);</pre>
<p>
Copies a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>.</p>
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</p>
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<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>, can be <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
</td>
</tr>
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<td>
<span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></td>
<td> the newly allocated <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>, which should
              be freed with <a href="pango-Glyph-Storage.html#pango-matrix-free"><code class="function">pango_matrix_free()</code></a>, or <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a> if
              <em class="parameter"><code>matrix</code></em> was <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>.

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</table></div>
<p>Since  1.6
</p>
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<div class="refsect2" lang="en">
<a name="id2771409"></a><h3>
<a name="pango-matrix-free"></a>pango_matrix_free ()</h3>
<a class="indexterm" name="id2771424"></a><pre class="programlisting">void        pango_matrix_free               (<a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix);</pre>
<p>
Free a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a> created with <a href="pango-Glyph-Storage.html#pango-matrix-copy"><code class="function">pango_matrix_copy()</code></a>.
Does nothing if <em class="parameter"><code>matrix</code></em> is <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>.</p>
<p>

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<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>, or <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
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</table></div>
<p>Since  1.6
</p>
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<hr>
<div class="refsect2" lang="en">
<a name="id2771531"></a><h3>
<a name="pango-matrix-translate"></a>pango_matrix_translate ()</h3>
<a class="indexterm" name="id2771546"></a><pre class="programlisting">void        pango_matrix_translate          (<a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             double tx,
                                             double ty);</pre>
<p>
Changes the transformation represented by <em class="parameter"><code>matrix</code></em> to be the
transformation given by first translating by (<em class="parameter"><code>tx</code></em>, <em class="parameter"><code>ty</code></em>)
then applying the original transformation.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>tx</code></em>&#160;:</span></td>
<td> amount to translate in the X direction
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>ty</code></em>&#160;:</span></td>
<td> amount to translate in the Y direction
</td>
</tr>
</tbody>
</table></div>
<p>Since  1.6
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2771670"></a><h3>
<a name="pango-matrix-scale"></a>pango_matrix_scale ()</h3>
<a class="indexterm" name="id2771686"></a><pre class="programlisting">void        pango_matrix_scale              (<a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             double scale_x,
                                             double scale_y);</pre>
<p>
Changes the transformation represented by <em class="parameter"><code>matrix</code></em> to be the
transformation given by first scaling by <em class="parameter"><code>sx</code></em> in the X direction
and <em class="parameter"><code>sy</code></em> in the Y direction then applying the original
transformation.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>scale_x</code></em>&#160;:</span></td>
<td> amount to scale by in X direction
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>scale_y</code></em>&#160;:</span></td>
<td> amount to scale by in Y direction
</td>
</tr>
</tbody>
</table></div>
<p>Since  1.6
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2771811"></a><h3>
<a name="pango-matrix-rotate"></a>pango_matrix_rotate ()</h3>
<a class="indexterm" name="id2771826"></a><pre class="programlisting">void        pango_matrix_rotate             (<a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             double degrees);</pre>
<p>
Changes the transformation represented by <em class="parameter"><code>matrix</code></em> to be the
transformation given by first rotating by <em class="parameter"><code>degrees</code></em> degrees
counter-clockwise then applying the original transformation.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>degrees</code></em>&#160;:</span></td>
<td> degrees to rotate counter-clockwise
</td>
</tr>
</tbody>
</table></div>
<p>Since  1.6
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2771924"></a><h3>
<a name="pango-matrix-concat"></a>pango_matrix_concat ()</h3>
<a class="indexterm" name="id2771940"></a><pre class="programlisting">void        pango_matrix_concat             (<a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             const <a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *new_matrix);</pre>
<p>
Changes the transformation represented by <em class="parameter"><code>matrix</code></em> to be the
transformation given by first applying transformation
given by <em class="parameter"><code>new_matrix</code></em> then applying the original transformation.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>new_matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>
</td>
</tr>
</tbody>
</table></div>
<p>Since  1.6
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2772044"></a><h3>
<a name="pango-matrix-transform-point"></a>pango_matrix_transform_point ()</h3>
<a class="indexterm" name="id2772059"></a><pre class="programlisting">void        pango_matrix_transform_point    (const <a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             double *x,
                                             double *y);</pre>
<p>
Transforms the point (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) by <em class="parameter"><code>matrix</code></em>.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>, or <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>x</code></em>&#160;:</span></td>
<td> in/out X position
</td>
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<td>
<span class="term"><em class="parameter"><code>y</code></em>&#160;:</span></td>
<td> in/out Y position
</td>
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</tbody>
</table></div>
<p>Since  1.16
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2772192"></a><h3>
<a name="pango-matrix-transform-distance"></a>pango_matrix_transform_distance ()</h3>
<a class="indexterm" name="id2772207"></a><pre class="programlisting">void        pango_matrix_transform_distance (const <a href="pango-Glyph-Storage.html#PangoMatrix">PangoMatrix</a> *matrix,
                                             double *dx,
                                             double *dy);</pre>
<p>
Transforms the distance vector (<em class="parameter"><code>dx</code></em>,<em class="parameter"><code>dy</code></em>) by <em class="parameter"><code>matrix</code></em>. This is
similar to <a href="pango-Glyph-Storage.html#pango-matrix-transform-point"><code class="function">pango_matrix_transform_point()</code></a> except that the translation
components of the transformation are ignored. The calculation of
the returned vector is as follows:
</p>
<p>
</p>
<pre class="programlisting">
dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;
</pre>
<p>
</p>
<p>
Affine transformations are position invariant, so the same vector
always transforms to the same vector. If (<em class="parameter"><code>x1</code></em>,<em class="parameter"><code>y1</code></em>) transforms
to (<em class="parameter"><code>x2</code></em>,<em class="parameter"><code>y2</code></em>) then (<em class="parameter"><code>x1</code></em>+<em class="parameter"><code>dx1</code></em>,<em class="parameter"><code>y1</code></em>+<em class="parameter"><code>dy1</code></em>) will transform to
(<em class="parameter"><code>x1</code></em>+<em class="parameter"><code>dx2</code></em>,<em class="parameter"><code>y1</code></em>+<em class="parameter"><code>dy2</code></em>) for all values of <em class="parameter"><code>x1</code></em> and <em class="parameter"><code>x2</code></em>.</p>
<p>

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<td>
<span class="term"><em class="parameter"><code>matrix</code></em>&#160;:</span></td>
<td> a <a href="pango-Glyph-Storage.html#PangoMatrix"><span class="type">PangoMatrix</span></a>, or <a
href="../glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>dx</code></em>&#160;:</span></td>
<td> in/out X component of a distance vector
</td>
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