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

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
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        ** review the following information:
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        #ifndef XFORM_H
        #define XFORM_H

        #include "arthurwidgets.h"

        #include <QBasicTimer>
        #include <QPolygonF>

        class HoverPoints;
        class QLineEdit;

        class XFormView : public ArthurFrame
        {
            Q_OBJECT

            Q_PROPERTY(bool animation READ animation WRITE setAnimation)
            Q_PROPERTY(double shear READ shear WRITE changeShear)
            Q_PROPERTY(double rotation READ rotation WRITE changeRotation)
            Q_PROPERTY(double scale READ scale WRITE changeScale)

        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(); }
            double shear() const { return m_shear; }
            double scale() const { return m_scale; }
            double rotation() const { return m_rotation; }

        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;
            double m_rotation;
            double m_scale;
            double m_shear;
            XFormType type;
            QPixmap pixmap;
            QBasicTimer timer;
        };

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

        private:
            XFormView *view;
        };

        #endif // XFORM_H