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| /*! |
| \example painting/deform |
| \title Vector Deformation |
| \ingroup examples-painting |
| \brief Demonstrates how to manipulate the elements of a QPainterPath. |
| |
| \brief This example shows how to use advanced vector techniques to draw text |
| using a \c QPainterPath. |
| |
| \image deform-demo.png |
| |
| 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. |
| |
| 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 |
| QPainterPath::addText() function. |
| |
| The lens is drawn using a single call to QPainter::drawEllipse(), |
| using a QRadialGradient 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. |
| */ |