Qt 5.6 | Qt Widgets | Affine Transformations | xform.h Example File

Qt 5.6.2 Reference Documentation

# xform.h Example File

painting/affine/xform.h

      /****************************************************************************
      **
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      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the demonstration applications of the Qt Toolkit.
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      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** Alternatively, this file may be used under the terms of the GNU Lesser
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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