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src/qwt_plot_canvas.h

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+/******************************************************************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_PLOT_CANVAS_H
+#define QWT_PLOT_CANVAS_H
+
+#include "qwt_global.h"
+#include "qwt_plot_abstract_canvas.h"
+
+#include <qframe.h>
+
+class QwtPlot;
+class QPixmap;
+class QPainterPath;
+
+/*!
+   \brief Canvas of a QwtPlot.
+
+   Canvas is the widget where all plot items are displayed
+
+   \sa QwtPlot::setCanvas(), QwtPlotGLCanvas, QwtPlotOpenGLCanvas
+ */
+class QWT_EXPORT QwtPlotCanvas : public QFrame, public QwtPlotAbstractCanvas
+{
+    Q_OBJECT
+
+    Q_PROPERTY( double borderRadius READ borderRadius WRITE setBorderRadius )
+
+  public:
+
+    /*!
+       \brief Paint attributes
+
+       The default setting enables BackingStore and Opaque.
+
+       \sa setPaintAttribute(), testPaintAttribute()
+     */
+    enum PaintAttribute
+    {
+        /*!
+           \brief Paint double buffered reusing the content
+                 of the pixmap buffer when possible.
+
+           Using a backing store might improve the performance
+           significantly, when working with widget overlays ( like rubber bands ).
+           Disabling the cache might improve the performance for
+           incremental paints (using QwtPlotDirectPainter ).
+
+           \sa backingStore(), invalidateBackingStore()
+         */
+        BackingStore = 1,
+
+        /*!
+           \brief Try to fill the complete contents rectangle
+                 of the plot canvas
+
+           When using styled backgrounds Qt assumes, that the
+           canvas doesn't fill its area completely
+           ( f.e because of rounded borders ) and fills the area
+           below the canvas. When this is done with gradients it might
+           result in a serious performance bottleneck - depending on the size.
+
+           When the Opaque attribute is enabled the canvas tries to
+           identify the gaps with some heuristics and to fill those only.
+
+           \warning Will not work for semitransparent backgrounds
+         */
+        Opaque       = 2,
+
+        /*!
+           \brief Try to improve painting of styled backgrounds
+
+           QwtPlotCanvas supports the box model attributes for
+           customizing the layout with style sheets. Unfortunately
+           the design of Qt style sheets has no concept how to
+           handle backgrounds with rounded corners - beside of padding.
+
+           When HackStyledBackground is enabled the plot canvas tries
+           to separate the background from the background border
+           by reverse engineering to paint the background before and
+           the border after the plot items. In this order the border
+           gets perfectly antialiased and you can avoid some pixel
+           artifacts in the corners.
+         */
+        HackStyledBackground = 4,
+
+        /*!
+           When ImmediatePaint is set replot() calls repaint()
+           instead of update().
+
+           \sa replot(), QWidget::repaint(), QWidget::update()
+         */
+        ImmediatePaint = 8
+    };
+
+    Q_DECLARE_FLAGS( PaintAttributes, PaintAttribute )
+
+    explicit QwtPlotCanvas( QwtPlot* = NULL );
+    virtual ~QwtPlotCanvas();
+
+    void setPaintAttribute( PaintAttribute, bool on = true );
+    bool testPaintAttribute( PaintAttribute ) const;
+
+    const QPixmap* backingStore() const;
+    Q_INVOKABLE void invalidateBackingStore();
+
+    virtual bool event( QEvent* ) QWT_OVERRIDE;
+
+    Q_INVOKABLE QPainterPath borderPath( const QRect& ) const;
+
+  public Q_SLOTS:
+    void replot();
+
+  protected:
+    virtual void paintEvent( QPaintEvent* ) QWT_OVERRIDE;
+    virtual void resizeEvent( QResizeEvent* ) QWT_OVERRIDE;
+
+    virtual void drawBorder( QPainter* ) QWT_OVERRIDE;
+
+  private:
+    class PrivateData;
+    PrivateData* m_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotCanvas::PaintAttributes )
+
+#endif