view demos/deform/pathdeform.html @ 393:1049b01aebd2

Fixed generator segfaults on OS X 10.6. Regarding the change to dgenerator.cpp, I am not actually sure if 0 is the correct value to pass, but it seems to work and the code which had been there before was just plain incorrect ? it read past the list boundaries.
author David Nadlinger <code@klickverbot.at>
date Sat, 28 Aug 2010 02:55:55 +0200
parents 849b66609571
children
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<html>
<center>
<h2>Vector deformation</h2>
</center>

<p>This demo shows how to use advanced vector techniques to draw text 
using a <code>QPainterPath</code>.</p>

<p>We define a vector deformation field in the shape of a lens and apply
this to all points in a path. This means that what is rendered on
screen is not pixel manipulation, but modified vector representations of
the glyphs themselves. This is visible from the high quality of the
antialiased edges for the deformed glyphs.</p>

<p>To get a fairly complex path we allow the user to type in text and
convert the text to paths. This is done using the
<code>QPainterPath::addText()</code> function.</p>

<p>The lens is drawn using a single call to <code>drawEllipse()</code>, using
a <code>QRadialGradient</code> to fill it with a specialized color table,
giving the effect of the Sun's reflection and a drop shadow. The lens
is cached as a pixmap for better performance.</p>

</html>