public void first() {
// ! [0]
QGraphicsScene scene = new QGraphicsScene();
scene.addText("Hello, world!");
QGraphicsView view = new QGraphicsView(scene);
view.show();
// ! [0]
}
public void fourth() {
// ! [4]
QGraphicsScene scene = new QGraphicsScene();
QGraphicsView view = new QGraphicsView(scene);
view.show();
// a white semi-transparent foreground
scene.setForegroundBrush(new QBrush(new QColor(255, 255, 255, 127)));
// a grid foreground
scene.setForegroundBrush(new QBrush(QColor.lightGray, Qt.BrushStyle.CrossPattern));
// ! [4]
}
public void third() {
// ! [3]
QGraphicsScene scene = new QGraphicsScene();
QGraphicsView view = new QGraphicsView(scene);
view.show();
// a blue background
scene.setBackgroundBrush(new QBrush(QColor.blue));
// a gradient background
QRadialGradient gradient = new QRadialGradient(0, 0, 10);
gradient.setSpread(QGradient.Spread.RepeatSpread);
scene.setBackgroundBrush(new QBrush(gradient));
// ! [3]
}
public void second() {
// ! [1]
QGraphicsScene scene = new QGraphicsScene();
scene.addRect(0d, 0d, 50d, 50d);
QPrinter printer = new QPrinter(QPrinter.PrinterMode.HighResolution);
printer.setPageSize(QPrinter.PageSize.A4);
QPainter painter = new QPainter(printer);
scene.render(painter);
// ! [1]
int depth = 0;
// ! [2]
QSizeF segmentSize = sceneRect().size().divide(java.lang.Math.pow(2, depth - 1));
// ! [2]
}