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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef TABLETCANVAS_H
#define TABLETCANVAS_H
#include <QBrush>
#include <QColor>
#include <QPen>
#include <QPixmap>
#include <QPoint>
#include <QTabletEvent>
#include <QWidget>
QT_BEGIN_NAMESPACE
class QPaintEvent;
class QString;
QT_END_NAMESPACE
//! [0]
class TabletCanvas : public QWidget
{
Q_OBJECT
public:
enum Valuator { PressureValuator, TangentialPressureValuator,
TiltValuator, VTiltValuator, HTiltValuator, NoValuator };
Q_ENUM(Valuator)
TabletCanvas();
bool saveImage(const QString &file);
bool loadImage(const QString &file);
void clear();
void setAlphaChannelValuator(Valuator type)
{ m_alphaChannelValuator = type; }
void setColorSaturationValuator(Valuator type)
{ m_colorSaturationValuator = type; }
void setLineWidthType(Valuator type)
{ m_lineWidthValuator = type; }
void setColor(const QColor &c)
{ if (c.isValid()) m_color = c; }
QColor color() const
{ return m_color; }
void setTabletDevice(QTabletEvent *event)
{ updateCursor(event); }
protected:
void tabletEvent(QTabletEvent *event) override;
void paintEvent(QPaintEvent *event) override;
void resizeEvent(QResizeEvent *event) override;
private:
void initPixmap();
void paintPixmap(QPainter &painter, QTabletEvent *event);
Qt::BrushStyle brushPattern(qreal value);
static qreal pressureToWidth(qreal pressure);
void updateBrush(const QTabletEvent *event);
void updateCursor(const QTabletEvent *event);
Valuator m_alphaChannelValuator = TangentialPressureValuator;
Valuator m_colorSaturationValuator = NoValuator;
Valuator m_lineWidthValuator = PressureValuator;
QColor m_color = Qt::red;
QPixmap m_pixmap;
QBrush m_brush;
QPen m_pen;
bool m_deviceDown = false;
struct Point {
QPointF pos;
qreal pressure = 0;
qreal rotation = 0;
} lastPoint;
};
//! [0]
#endif
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