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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "renderarea.h" |
| |
| #include <QPainter> |
| #include <QPainterPath> |
| |
| //! [0] |
| RenderArea::RenderArea(QWidget *parent) |
| : QWidget(parent) |
| { |
| shape = Polygon; |
| antialiased = false; |
| transformed = false; |
| pixmap.load(":/images/qt-logo.png"); |
| |
| setBackgroundRole(QPalette::Base); |
| setAutoFillBackground(true); |
| } |
| //! [0] |
| |
| //! [1] |
| QSize RenderArea::minimumSizeHint() const |
| { |
| return QSize(100, 100); |
| } |
| //! [1] |
| |
| //! [2] |
| QSize RenderArea::sizeHint() const |
| { |
| return QSize(400, 200); |
| } |
| //! [2] |
| |
| //! [3] |
| void RenderArea::setShape(Shape shape) |
| { |
| this->shape = shape; |
| update(); |
| } |
| //! [3] |
| |
| //! [4] |
| void RenderArea::setPen(const QPen &pen) |
| { |
| this->pen = pen; |
| update(); |
| } |
| //! [4] |
| |
| //! [5] |
| void RenderArea::setBrush(const QBrush &brush) |
| { |
| this->brush = brush; |
| update(); |
| } |
| //! [5] |
| |
| //! [6] |
| void RenderArea::setAntialiased(bool antialiased) |
| { |
| this->antialiased = antialiased; |
| update(); |
| } |
| //! [6] |
| |
| //! [7] |
| void RenderArea::setTransformed(bool transformed) |
| { |
| this->transformed = transformed; |
| update(); |
| } |
| //! [7] |
| |
| //! [8] |
| 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; |
| //! [8] |
| |
| //! [9] |
| QPainter painter(this); |
| painter.setPen(pen); |
| painter.setBrush(brush); |
| if (antialiased) |
| painter.setRenderHint(QPainter::Antialiasing, true); |
| //! [9] |
| |
| //! [10] |
| for (int x = 0; x < width(); x += 100) { |
| for (int y = 0; y < height(); y += 100) { |
| painter.save(); |
| painter.translate(x, y); |
| //! [10] //! [11] |
| if (transformed) { |
| painter.translate(50, 50); |
| painter.rotate(60.0); |
| painter.scale(0.6, 0.9); |
| painter.translate(-50, -50); |
| } |
| //! [11] |
| |
| //! [12] |
| 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); |
| } |
| //! [12] //! [13] |
| 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)); |
| } |
| //! [13] |