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40 ****************************************************************************/ |
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41 |
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42 /*! |
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43 \example demos/deform |
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44 \title Vector Deformation |
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45 |
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46 This demo shows how to use advanced vector techniques to draw text |
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47 using a \c QPainterPath. |
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48 |
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49 \image deform-demo.png |
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50 |
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51 We define a vector deformation field in the shape of a lens and apply |
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52 this to all points in a path. This means that what is rendered on |
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53 screen is not pixel manipulation, but modified vector representations of |
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54 the glyphs themselves. This is visible from the high quality of the |
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55 antialiased edges for the deformed glyphs. |
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56 |
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57 To get a fairly complex path we allow the user to type in text and |
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58 convert the text to paths. This is done using the |
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59 QPainterPath::addText() function. |
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60 |
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61 The lens is drawn using a single call to QPainter::drawEllipse(), |
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62 using a QRadialGradient to fill it with a specialized color |
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63 table, giving the effect of the sun's reflection and a drop |
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64 shadow. The lens is cached as a pixmap for better performance. |
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65 */ |