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QwtPlotCanvas(3)               Qwt User's Guide               QwtPlotCanvas(3)


QwtPlotCanvas -


#include <qwt_plot_canvas.h> Public Types enum FocusIndicator { NoFocusIndicator, CanvasFocusIndicator, ItemFocusIndicator } enum PaintAttribute { PaintCached = 1, PaintPacked = 2 } Public Member Functions QwtPlotCanvas (QwtPlot *) virtual ~QwtPlotCanvas () FocusIndicator focusIndicator () const void invalidatePaintCache () QPixmap * paintCache () const QPixmap * paintCache () const QwtPlot * plot () const QwtPlot * plot () const void replot () void setFocusIndicator (FocusIndicator) void setPaintAttribute (PaintAttribute, bool on=true) bool testPaintAttribute (PaintAttribute) const Protected Member Functions void drawCanvas (QPainter *painter=NULL) virtual void drawContents (QPainter *) virtual void drawFocusIndicator (QPainter *) virtual void hideEvent (QHideEvent *) virtual void paintEvent (QPaintEvent *) Detailed Description Canvas of a QwtPlot. See also: QwtPlot Member Enumeration Documentation enum QwtPlotCanvas::FocusIndicator Focus indicator. .IP "o" 2 NoFocusIndicator Don't paint a focus indicator o CanvasFocusIndicator The focus is related to the complete canvas. Paint the focus indicator using paintFocus() o ItemFocusIndicator The focus is related to an item (curve, point, ...) on the canvas. It is up to the application to display a focus indication using f.e. highlighting. See also: setFocusIndicator(), focusIndicator(), paintFocus() enum QwtPlotCanvas::PaintAttribute Paint attributes. .IP "o" 2 PaintCached Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus. Disabling the cache will improve the performance for incremental paints (using QwtPlotCurve::draw). o PaintPacked Suppress system background repaints and paint it together with the canvas contents. Painting packed might avoid flickering for expensive repaints, when there is a notable gap between painting the background and the plot contents. The default setting enables PaintCached and PaintPacked See also: setPaintAttribute(), testPaintAttribute(), paintCache() Member Function Documentation void QwtPlotCanvas::drawCanvas (QPainter *painter = NULL) [protected] Draw the the canvas Paints all plot items to the contentsRect(), using QwtPlot::drawCanvas and updates the paint cache. Parameters: painter Painter See also: QwtPlot::drawCanvas(), setPaintAttributes(), testPaintAttributes() void QwtPlotCanvas::drawContents (QPainter *painter) [protected], [virtual] Redraw the canvas, and focus rect Parameters: painter Painter void QwtPlotCanvas::drawFocusIndicator (QPainter *painter) [protected], [virtual] Draw the focus indication Parameters: painter Painter QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator () const Returns: Focus indicator See also: FocusIndicator, setFocusIndicator() void QwtPlotCanvas::hideEvent (QHideEvent *event) [protected], [virtual] Hide event Parameters: event Hide event void QwtPlotCanvas::paintEvent (QPaintEvent *event) [protected], [virtual] Paint event Parameters: event Paint event void QwtPlotCanvas::replot () Invalidate the paint cache and repaint the canvas See also: invalidatePaintCache() void QwtPlotCanvas::setFocusIndicator (FocusIndicatorfocusIndicator) Set the focus indicator See also: FocusIndicator, focusIndicator() void QwtPlotCanvas::setPaintAttribute (PaintAttributeattribute, boolon = true) Changing the paint attributes. Parameters: attribute Paint attribute on On/Off The default setting enables PaintCached and PaintPacked See also: testPaintAttribute(), drawCanvas(), drawContents(), paintCache() bool QwtPlotCanvas::testPaintAttribute (PaintAttributeattribute) const Test wether a paint attribute is enabled Parameters: attribute Paint attribute Returns: true if the attribute is enabled See also: setPaintAttribute() Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.3 Tue Nov 20 2012 QwtPlotCanvas(3)

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