- Qt 5.5
- Qt Widgets
- Path Stroking
- pathstroke.h Example File
- Qt 5.5.1 Reference Documentation

# pathstroke.h Example File

painting/pathstroke/pathstroke.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
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    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
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    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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    #ifndef PATHSTROKE_H
    #define PATHSTROKE_H

    #include "arthurwidgets.h"

    #include <QtWidgets>

    class PathStrokeRenderer : public ArthurFrame
    {
        Q_OBJECT
        Q_PROPERTY(bool animation READ animation WRITE setAnimation)
        Q_PROPERTY(qreal penWidth READ realPenWidth WRITE setRealPenWidth)
    public:
        enum PathMode { CurveMode, LineMode };

        explicit PathStrokeRenderer(QWidget *parent, bool smallScreen = false);

        void paint(QPainter *) Q_DECL_OVERRIDE;
        void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
        bool event(QEvent *e) Q_DECL_OVERRIDE;

        QSize sizeHint() const Q_DECL_OVERRIDE { return QSize(500, 500); }

        bool animation() const { return m_timer.isActive(); }

        qreal realPenWidth() const { return m_penWidth; }
        void setRealPenWidth(qreal penWidth) { m_penWidth = penWidth; update(); }

    signals:
        void clicked();

    public slots:
        void setPenWidth(int penWidth) { m_penWidth = penWidth / 10.0; update(); }
        void setAnimation(bool animation);

        void setFlatCap() { m_capStyle = Qt::FlatCap; update(); }
        void setSquareCap() { m_capStyle = Qt::SquareCap; update(); }
        void setRoundCap() { m_capStyle = Qt::RoundCap; update(); }

        void setBevelJoin() { m_joinStyle = Qt::BevelJoin; update(); }
        void setMiterJoin() { m_joinStyle = Qt::MiterJoin; update(); }
        void setRoundJoin() { m_joinStyle = Qt::RoundJoin; update(); }

        void setCurveMode() { m_pathMode = CurveMode; update(); }
        void setLineMode() { m_pathMode = LineMode; update(); }

        void setSolidLine() { m_penStyle = Qt::SolidLine; update(); }
        void setDashLine() { m_penStyle = Qt::DashLine; update(); }
        void setDotLine() { m_penStyle = Qt::DotLine; update(); }
        void setDashDotLine() { m_penStyle = Qt::DashDotLine; update(); }
        void setDashDotDotLine() { m_penStyle = Qt::DashDotDotLine; update(); }
        void setCustomDashLine() { m_penStyle = Qt::NoPen; update(); }

    private:
        void initializePoints();
        void updatePoints();

        QBasicTimer m_timer;

        PathMode m_pathMode;

        bool m_wasAnimated;

        qreal m_penWidth;
        int m_pointCount;
        int m_pointSize;
        int m_activePoint;
        QVector<QPointF> m_points;
        QVector<QPointF> m_vectors;

        Qt::PenJoinStyle m_joinStyle;
        Qt::PenCapStyle m_capStyle;

        Qt::PenStyle m_penStyle;

        bool m_smallScreen;
        QPoint m_mousePress;
        bool m_mouseDrag;

        QHash<int, int> m_fingerPointMapping;
    };

    class PathStrokeControls : public QWidget
    {
        Q_OBJECT

    public:
        PathStrokeControls(QWidget* parent, PathStrokeRenderer* renderer, bool smallScreen);

    signals:
        void okPressed();
        void quitPressed();

    private:
        PathStrokeRenderer* m_renderer;

        QGroupBox *m_capGroup;
        QGroupBox *m_joinGroup;
        QGroupBox *m_styleGroup;
        QGroupBox *m_pathModeGroup;

        void createCommonControls(QWidget* parent);
        void layoutForDesktop();
        void layoutForSmallScreens();

    private slots:
        void emitQuitSignal();
        void emitOkSignal();

    };

    class PathStrokeWidget : public QWidget
    {
        Q_OBJECT

    public:
        PathStrokeWidget(bool smallScreen);
        void setStyle ( QStyle * style );

    private:
        PathStrokeRenderer *m_renderer;
        PathStrokeControls *m_controls;

    private slots:
        void showControls();
        void hideControls();
    };

    #endif // PATHSTROKE_H