Mercurial > projects > qtd
comparison demos/deform/pathdeform.html @ 161:849b66609571
a few fixes
| author | mwarning |
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| date | Wed, 17 Jun 2009 22:39:42 +0000 |
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| 160:624b4a58556e | 161:849b66609571 |
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| 1 <html> | |
| 2 <center> | |
| 3 <h2>Vector deformation</h2> | |
| 4 </center> | |
| 5 | |
| 6 <p>This demo shows how to use advanced vector techniques to draw text | |
| 7 using a <code>QPainterPath</code>.</p> | |
| 8 | |
| 9 <p>We define a vector deformation field in the shape of a lens and apply | |
| 10 this to all points in a path. This means that what is rendered on | |
| 11 screen is not pixel manipulation, but modified vector representations of | |
| 12 the glyphs themselves. This is visible from the high quality of the | |
| 13 antialiased edges for the deformed glyphs.</p> | |
| 14 | |
| 15 <p>To get a fairly complex path we allow the user to type in text and | |
| 16 convert the text to paths. This is done using the | |
| 17 <code>QPainterPath::addText()</code> function.</p> | |
| 18 | |
| 19 <p>The lens is drawn using a single call to <code>drawEllipse()</code>, using | |
| 20 a <code>QRadialGradient</code> to fill it with a specialized color table, | |
| 21 giving the effect of the Sun's reflection and a drop shadow. The lens | |
| 22 is cached as a pixmap for better performance.</p> | |
| 23 | |
| 24 </html> |