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Last change
on this file since 139 was 2, checked in by Dmitry A. Kuminov, 16 years ago |
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Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
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File size:
947 bytes
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| 1 | <html>
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| 2 | <center>
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| 3 | <h2>Vector deformation</h2>
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| 4 | </center>
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| 5 |
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| 6 | <p>This demo shows how to use advanced vector techniques to draw text
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| 7 | using a <code>QPainterPath</code>.</p>
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| 8 |
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| 9 | <p>We define a vector deformation field in the shape of a lens and apply
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| 10 | this to all points in a path. This means that what is rendered on
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| 11 | screen is not pixel manipulation, but modified vector representations of
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| 12 | the glyphs themselves. This is visible from the high quality of the
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| 13 | antialiased edges for the deformed glyphs.</p>
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| 14 |
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| 15 | <p>To get a fairly complex path we allow the user to type in text and
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| 16 | convert the text to paths. This is done using the
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| 17 | <code>QPainterPath::addText()</code> function.</p>
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| 18 |
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| 19 | <p>The lens is drawn using a single call to <code>drawEllipse()</code>, using
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| 20 | a <code>QRadialGradient</code> to fill it with a specialized color table,
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| 21 | giving the effect of the Sun's reflection and a drop shadow. The lens
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| 22 | is cached as a pixmap for better performance.</p>
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| 23 |
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| 24 | </html>
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