comparison: src/widgets/patternviewer.cpp
src/widgets/patternviewer.cpp
- branch
- experimental
- changeset 1363
- b725b7fb63a5
equal
deleted
inserted
replaced
| 1353:48374309f3d1 | 1363:b725b7fb63a5 |
|---|---|
| 1 #include <QPainter> | |
| 2 #include <QPaintEvent> | |
| 3 #include "patterneditor.h" | |
| 4 #include "patternviewer.h" | |
| 5 | |
| 6 /* | |
| 7 * Construct a pattern viewer for an existing pattern editor. | |
| 8 */ | |
| 9 PatternViewer::PatternViewer(PatternEditor* parent) : | |
| 10 QWidget {parent}, | |
| 11 editor {parent} | |
| 12 { | |
| 13 this->transformation.scale(4, 4); | |
| 14 } | |
| 15 | |
| 16 /* | |
| 17 * Unfortunately, Qt doesn't provide an easy way to translate a floating point rectangle | |
| 18 * into a floating point polygon. So here's a manual implementation. | |
| 19 */ | |
| 20 static QPolygonF transformRect(const QRectF& rect, const QTransform& transform) | |
| 21 { | |
| 22 QPolygonF transformed; | |
| 23 for (const QPointF& point : { | |
| 24 rect.topLeft(), | |
| 25 rect.topRight(), | |
| 26 rect.bottomRight(), | |
| 27 rect.bottomLeft() | |
| 28 }) { | |
| 29 transformed.append(transform.map(point)); | |
| 30 } | |
| 31 return transformed; | |
| 32 } | |
| 33 | |
| 34 /* | |
| 35 * Renders the pattern. | |
| 36 */ | |
| 37 void PatternViewer::paintEvent(QPaintEvent* event) | |
| 38 { | |
| 39 const Pattern& pattern = this->editor->pattern; | |
| 40 static const QPixmap viewerBackground {":/data/pattern-background.png"}; | |
| 41 static const QPixmap canvasBackground {":/data/transparent-background.png"}; | |
| 42 QPainter painter {this}; | |
| 43 painter.drawTiledPixmap(this->rect(), viewerBackground); | |
| 44 painter.setBrush(canvasBackground); | |
| 45 QRectF canvasRect = QRectF {{0.0f, 0.0f}, pattern.canvasSize}; | |
| 46 painter.drawPolygon(::transformRect(canvasRect, this->transformation)); | |
| 47 painter.setTransform(this->transformation); | |
| 48 event->accept(); | |
| 49 } |
