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| <center> |
| <h2>Vector deformation</h2> |
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| |
| <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> |
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