summaryrefslogtreecommitdiffstats
path: root/doc/src
diff options
context:
space:
mode:
authorBjørn Erik Nilsen <bjorn.nilsen@nokia.com>2009-08-24 13:32:24 (GMT)
committerBjørn Erik Nilsen <bjorn.nilsen@nokia.com>2009-08-24 17:21:26 (GMT)
commit2823ca13453d354911b065e018dda4d17a06f6d2 (patch)
tree6829711848a5f285831f3ba658fefc6b763e2230 /doc/src
parenta8574172dd5e6bc11cf6f69b6fad5a063549e88d (diff)
downloadQt-2823ca13453d354911b065e018dda4d17a06f6d2.zip
Qt-2823ca13453d354911b065e018dda4d17a06f6d2.tar.gz
Qt-2823ca13453d354911b065e018dda4d17a06f6d2.tar.bz2
doc: More documentation of the graphics effect framework.
Diffstat (limited to 'doc/src')
-rw-r--r--doc/src/snippets/code/src_gui_effects_qgraphicseffect.cpp33
1 files changed, 33 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_gui_effects_qgraphicseffect.cpp b/doc/src/snippets/code/src_gui_effects_qgraphicseffect.cpp
new file mode 100644
index 0000000..6265c80
--- /dev/null
+++ b/doc/src/snippets/code/src_gui_effects_qgraphicseffect.cpp
@@ -0,0 +1,33 @@
+//! [0]
+MyGraphicsOpacityEffect::draw(QPainter *painter, QGraphicsEffectSource *source)
+{
+ // Fully opaque; draw directly without going through a pixmap.
+ if (qFuzzyCompare(m_opacity, 1)) {
+ source->draw(painter);
+ return;
+ }
+ ...
+}
+//! [0]
+
+//! [1]
+MyGraphicsEffect::draw(QPainter *painter, QGraphicsEffectSource *source)
+{
+ ...
+ QPoint offset;
+ if (source->isPixmap()) {
+ // No point in drawing in device coordinates (pixmap will be scaled anyways).
+ const QPixmap pixmap = source->pixmap(Qt::LogicalCoordinates, &offset);
+ ...
+ painter->drawPixmap(offset, pixmap);
+ } else {
+ // Draw pixmap in device coordinates to avoid pixmap scaling;
+ const QPixmap pixmap = source->pixmap(Qt::DeviceCoordinates, &offset);
+ painter->setWorldTransform(QTransform());
+ ...
+ painter->drawPixmap(offset, pixmap);
+ }
+ ...
+}
+//! [1]
+