xform.h Example File
demos/affine/xform.h

 /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
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 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact qt-sales@nokia.com if any conditions of this licensing
 ** agreement are not clear to you.
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 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
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 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 ****************************************************************************/

 #ifndef XFORM_H
 #define XFORM_H

 #include "arthurwidgets.h"

 #include <QBasicTimer>
 #include <QPolygonF>

 class HoverPoints;
 QT_FORWARD_DECLARE_CLASS(QLineEdit)

 class XFormView : public ArthurFrame
 {
     Q_OBJECT

     Q_PROPERTY(bool animation READ animation WRITE setAnimation)
     Q_PROPERTY(qreal shear READ shear WRITE setShear)
     Q_PROPERTY(qreal rotation READ rotation WRITE setRotation)
     Q_PROPERTY(qreal scale READ scale WRITE setScale)

 public:
     XFormView(QWidget *parent);
     void paint(QPainter *);
     void drawVectorType(QPainter *painter);
     void drawPixmapType(QPainter *painter);
     void drawTextType(QPainter *painter);
     QSize sizeHint() const { return QSize(500, 500); }

     void mousePressEvent(QMouseEvent *e);
     void resizeEvent(QResizeEvent *e);
     HoverPoints *hoverPoints() { return pts; }

     QLineEdit *textEditor;

     bool animation() const { return timer.isActive(); }
     qreal shear() const { return m_shear; }
     qreal scale() const { return m_scale; }
     qreal rotation() const { return m_rotation; }
     void setShear(qreal s);
     void setScale(qreal s);
     void setRotation(qreal r);

 public slots:
     void setAnimation(bool animate);
     void updateCtrlPoints(const QPolygonF &);
     void changeRotation(int rotation);
     void changeScale(int scale);
     void changeShear(int shear);

     void setVectorType();
     void setPixmapType();
     void setTextType();
     void reset();

 signals:
     void rotationChanged(int rotation);
     void scaleChanged(int scale);
     void shearChanged(int shear);

 protected:
     void timerEvent(QTimerEvent *e);
     void wheelEvent(QWheelEvent *);

 private:
     enum XFormType { VectorType, PixmapType, TextType };

     QPolygonF ctrlPoints;
     HoverPoints *pts;
     qreal m_rotation;
     qreal m_scale;
     qreal m_shear;
     XFormType type;
     QPixmap pixmap;
     QBasicTimer timer;
 };

 class XFormWidget : public QWidget
 {
     Q_OBJECT
 public:
     XFormWidget(QWidget *parent);

 private:
     XFormView *view;
 };

 #endif // XFORM_H