renderarea.cpp Example File

painting/basicdrawing/renderarea.cpp
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#include "renderarea.h" #include <QPainter> RenderArea::RenderArea(QWidget *parent) : QWidget(parent) { shape = Polygon; antialiased = false; transformed = false; pixmap.load(":/images/qt-logo.png"); setBackgroundRole(QPalette::Base); setAutoFillBackground(true); } QSize RenderArea::minimumSizeHint() const { return QSize(100, 100); } QSize RenderArea::sizeHint() const { return QSize(400, 200); } void RenderArea::setShape(Shape shape) { this->shape = shape; update(); } void RenderArea::setPen(const QPen &pen) { this->pen = pen; update(); } void RenderArea::setBrush(const QBrush &brush) { this->brush = brush; update(); } void RenderArea::setAntialiased(bool antialiased) { this->antialiased = antialiased; update(); } void RenderArea::setTransformed(bool transformed) { this->transformed = transformed; update(); } void RenderArea::paintEvent(QPaintEvent * /* event */) { static const QPoint points[4] = { QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70) }; QRect rect(10, 20, 80, 60); QPainterPath path; path.moveTo(20, 80); path.lineTo(20, 30); path.cubicTo(80, 0, 50, 50, 80, 80); int startAngle = 20 * 16; int arcLength = 120 * 16; QPainter painter(this); painter.setPen(pen); painter.setBrush(brush); if (antialiased) painter.setRenderHint(QPainter::Antialiasing, true); for (int x = 0; x < width(); x += 100) { for (int y = 0; y < height(); y += 100) { painter.save(); painter.translate(x, y); if (transformed) { painter.translate(50, 50); painter.rotate(60.0); painter.scale(0.6, 0.9); painter.translate(-50, -50); } switch (shape) { case Line: painter.drawLine(rect.bottomLeft(), rect.topRight()); break; case Points: painter.drawPoints(points, 4); break; case Polyline: painter.drawPolyline(points, 4); break; case Polygon: painter.drawPolygon(points, 4); break; case Rect: painter.drawRect(rect); break; case RoundedRect: painter.drawRoundedRect(rect, 25, 25, Qt::RelativeSize); break; case Ellipse: painter.drawEllipse(rect); break; case Arc: painter.drawArc(rect, startAngle, arcLength); break; case Chord: painter.drawChord(rect, startAngle, arcLength); break; case Pie: painter.drawPie(rect, startAngle, arcLength); break; case Path: painter.drawPath(path); break; case Text: painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nThe Qt Company")); break; case Pixmap: painter.drawPixmap(10, 10, pixmap); } painter.restore(); } } painter.setRenderHint(QPainter::Antialiasing, false); painter.setPen(palette().dark().color()); painter.setBrush(Qt::NoBrush); painter.drawRect(QRect(0, 0, width() - 1, height() - 1)); }