- Qt 5.5
- Qt Widgets
- Affine Transformations
- xform.h Example File
- Qt 5.5.1 Reference Documentation

# xform.h Example File

painting/affine/xform.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
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    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** 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 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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    **
    ** As a special exception, The Qt Company gives you certain additional
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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
    {
    public:
        Q_OBJECT

        Q_PROPERTY(XFormType type READ type WRITE setType)
        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)
        Q_PROPERTY(QString text READ text WRITE setText)
        Q_PROPERTY(QPixmap pixmap READ pixmap WRITE setPixmap)
        Q_ENUMS(XFormType)

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

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

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

        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);

        XFormType type() const;
        QPixmap pixmap() const;
        QString text() const;

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

        void setText(const QString &);
        void setPixmap(const QPixmap &);
        void setType(XFormType t);

        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) Q_DECL_OVERRIDE;
    #ifndef QT_NO_WHEELEVENT
        void wheelEvent(QWheelEvent *) Q_DECL_OVERRIDE;
    #endif

    private:
        QPolygonF ctrlPoints;
        HoverPoints *pts;
        qreal m_rotation;
        qreal m_scale;
        qreal m_shear;
        XFormType m_type;
        QPixmap m_pixmap;
        QString m_text;
        QBasicTimer timer;
    };

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

    private:
        XFormView *view;
        QLineEdit *textEditor;
    };

    #endif // XFORM_H