qt5base-lts/examples/widgets/painting/transformations/renderarea.h

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#ifndef RENDERAREA_H
#define RENDERAREA_H

#include <QList>
#include <QPainterPath>
#include <QRect>
#include <QWidget>

QT_BEGIN_NAMESPACE
class QPaintEvent;
QT_END_NAMESPACE

//! [0]
enum Operation { NoTransformation, Translate, Rotate, Scale };
//! [0]

//! [1]
class RenderArea : public QWidget
{
    Q_OBJECT

public:
    RenderArea(QWidget *parent = 0);

    void setOperations(const QList<Operation> &operations);
    void setShape(const QPainterPath &shape);

    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
    QSize sizeHint() const Q_DECL_OVERRIDE;

protected:
    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
//! [1]

//! [2]
private:
    void drawCoordinates(QPainter &painter);
    void drawOutline(QPainter &painter);
    void drawShape(QPainter &painter);
    void transformPainter(QPainter &painter);

    QList<Operation> operations;
    QPainterPath shape;
    QRect xBoundingRect;
    QRect yBoundingRect;
};
//! [2]

#endif // RENDERAREA_H