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<h2 class="memtitle"><span class="permalink"><a href="#gaef5dcf4dab69857a4516cfa3770a6201">◆ </a></span>vkvg_matrix_transform_distance()</h2>
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<td class="memname">void vkvg_matrix_transform_distance </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structvkvg__matrix__t.html">vkvg_matrix_t</a> * </td>
<td class="paramname"><em>matrix</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float * </td>
<td class="paramname"><em>dx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">float * </td>
<td class="paramname"><em>dy</em> </td>
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<p>Transforms the distance vector (dx ,dy ) by matrix . This is similar to #cairo_matrix_transform_point() except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows: </p><div class="fragment"><div class="line">dx2 = dx1 * a + dy1 * c;</div>
<div class="line">dy2 = dx1 * b + dy1 * d;</div>
</div><!-- fragment --><p> Affine transformations are position invariant, so the same vector always transforms to the same vector. If (x1 ,y1 ) transforms to (x2 ,y2 ) then (x1 +dx1 ,y1 +dy1 ) will transform to (x1 +dx2 ,y1 +dy2 ) for all values of x1 and x2 . </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">matrix</td><td>a valid <a class="el" href="structvkvg__matrix__t.html" title="vkvg matrix structure">vkvg_matrix_t</a> to use to transform distance </td></tr>
<tr><td class="paramname">dx</td><td>X component of a distance vector. An in/out parameter </td></tr>
<tr><td class="paramname">dy</td><td>Y component of a distance vector. An in/out parameter </td></tr>
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