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//! [0]
scene = QGraphicsScene()
scene.addText("Hello, world!")
view = QGraphicsView(&scene)
view.show()
//! [0]
//! [1]
scene = QGraphicsScene
scene.addItem(...
...
printer = QPrinter(QPrinter.HighResolution)
printer.setPaperSize(QPrinter.A4)
painter = QPainter(printer)
scene.render(&painter)
//! [1]
//! [2]
segmentSize = sceneRect().size() / math.pow(2, depth - 1)
//! [2]
//! [3]
scene = QGraphicsScene()
view = QGraphicsView(scene)
view.show()
# a blue background
scene.setBackgroundBrush(Qt.blue)
# a gradient background
gradient = QRadialGradient(0, 0, 10)
gradient.setSpread(QGradient.RepeatSpread)
scene.setBackgroundBrush(gradient)
//! [3]
//! [4]
scene = QGraphicsScene()
view = QGraphicsView(scene)
view.show()
# a white semi-transparent foreground
scene.setForegroundBrush(QColor(255, 255, 255, 127))
# a grid foreground
scene.setForegroundBrush(QBrush(Qt.lightGray, Qt.CrossPattern))
//! [4]
//! [5]
class TileScene (QGraphicsScene):
# ...
def rectForTile(x, y):
# Return the rectangle for the tile at position (x, y).
return QRectF(x * self.tileWidth, y * self.tileHeight, self.tileWidth, self.tileHeight)
def setTile(x, y, pixmap):
# Sets or replaces the tile at position (x, y) with pixmap.
if x >= 0 && x < self.numTilesH && y >= 0 && y < self.numTilesV:
self.tiles[y][x] = pixmap
invalidate(rectForTile(x, y), BackgroundLayer)
def drawBackground(painter, exposed):
# Draws all tiles that intersect the exposed area.
for y in range(0, self.numTilesV:
for x in range(0, self.numTilesH:
rect = rectForTile(x, y)
if exposed.intersects(rect):
painter.drawPixmap(rect.topLeft(), tiles[y][x])
//! [5]
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