renderarea.cpp Example File

painting/transformations/renderarea.cpp
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#include "renderarea.h" #include <QPainter> #include <QPaintEvent> RenderArea::RenderArea(QWidget *parent) : QWidget(parent) { QFont newFont = font(); newFont.setPixelSize(12); setFont(newFont); QFontMetrics fontMetrics(newFont); xBoundingRect = fontMetrics.boundingRect(tr("x")); yBoundingRect = fontMetrics.boundingRect(tr("y")); } void RenderArea::setOperations(const QList<Operation> &operations) { this->operations = operations; update(); } void RenderArea::setShape(const QPainterPath &shape) { this->shape = shape; update(); } QSize RenderArea::minimumSizeHint() const { return QSize(182, 182); } QSize RenderArea::sizeHint() const { return QSize(232, 232); } void RenderArea::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.fillRect(event->rect(), QBrush(Qt::white)); painter.translate(66, 66); painter.save(); transformPainter(painter); drawShape(painter); painter.restore(); drawOutline(painter); transformPainter(painter); drawCoordinates(painter); } void RenderArea::drawCoordinates(QPainter &painter) { painter.setPen(Qt::red); painter.drawLine(0, 0, 50, 0); painter.drawLine(48, -2, 50, 0); painter.drawLine(48, 2, 50, 0); painter.drawText(60 - xBoundingRect.width() / 2, 0 + xBoundingRect.height() / 2, tr("x")); painter.drawLine(0, 0, 0, 50); painter.drawLine(-2, 48, 0, 50); painter.drawLine(2, 48, 0, 50); painter.drawText(0 - yBoundingRect.width() / 2, 60 + yBoundingRect.height() / 2, tr("y")); } void RenderArea::drawOutline(QPainter &painter) { painter.setPen(Qt::darkGreen); painter.setPen(Qt::DashLine); painter.setBrush(Qt::NoBrush); painter.drawRect(0, 0, 100, 100); } void RenderArea::drawShape(QPainter &painter) { painter.fillPath(shape, Qt::blue); } void RenderArea::transformPainter(QPainter &painter) { for (int i = 0; i < operations.size(); ++i) { switch (operations[i]) { case Translate: painter.translate(50, 50); break; case Scale: painter.scale(0.75, 0.75); break; case Rotate: painter.rotate(60); break; case NoTransformation: default: ; } } }