/******************************************************************************** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).** All rights reserved.** Contact: Nokia Corporation (qt-info@nokia.com)**** This file is part of the examples of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL$** No Commercial Usage** This file contains pre-release code and may not be distributed.** You may use this file in accordance with the terms and conditions** contained in the Technology Preview License Agreement accompanying** this package.**** GNU Lesser General Public License Usage** Alternatively, this file may be used under the terms of the GNU Lesser** General Public License version 2.1 as published by the Free Software** Foundation and appearing in the file LICENSE.LGPL included in the** packaging of this file. Please review the following information to** ensure the GNU Lesser General Public License version 2.1 requirements** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Nokia gives you certain additional** rights. These rights are described in the Nokia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** If you have questions regarding the use of this file, please contact** Nokia at qt-info@nokia.com.****************** $QT_END_LICENSE$******************************************************************************/#ifndef TABLETCANVAS_H#define TABLETCANVAS_H#include <QWidget>#include <QPixmap>#include <QPoint>#include <QTabletEvent>#include <QColor>#include <QBrush>#include <QPen>#include <QPoint>QT_BEGIN_NAMESPACEclass QPaintEvent;class QString;QT_END_NAMESPACE//! [0]class TabletCanvas : public QWidget{ Q_OBJECTpublic: enum AlphaChannelType { AlphaPressure, AlphaTilt, NoAlpha }; enum ColorSaturationType { SaturationVTilt, SaturationHTilt, SaturationPressure, NoSaturation }; enum LineWidthType { LineWidthPressure, LineWidthTilt, NoLineWidth }; TabletCanvas(); bool saveImage(const QString &file); bool loadImage(const QString &file); void setAlphaChannelType(AlphaChannelType type) { alphaChannelType = type; } void setColorSaturationType(ColorSaturationType type) { colorSaturationType = type; } void setLineWidthType(LineWidthType type) { lineWidthType = type; } void setColor(const QColor &color) { myColor = color; } QColor color() const { return myColor; } void setTabletDevice(QTabletEvent::TabletDevice device) { myTabletDevice = device; } int maximum(int a, int b) { return a > b ? a : b; }protected: void tabletEvent(QTabletEvent *event); void paintEvent(QPaintEvent *event); void resizeEvent(QResizeEvent *event);private: void initPixmap(); void paintPixmap(QPainter &painter, QTabletEvent *event); Qt::BrushStyle brushPattern(qreal value); void updateBrush(QTabletEvent *event); AlphaChannelType alphaChannelType; ColorSaturationType colorSaturationType; LineWidthType lineWidthType; QTabletEvent::PointerType pointerType; QTabletEvent::TabletDevice myTabletDevice; QColor myColor; QPixmap pixmap; QBrush myBrush; QPen myPen; bool deviceDown; QPoint polyLine[3];};//! [0]#endif