NAME¶

QwtPlotCanvas -

SYNOPSIS¶

#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:

Member Enumeration Documentation¶

enum QwtPlotCanvas::FocusIndicator¶

Focus indicator. .IP "•" 2 NoFocusIndicator
Don't paint a focus indicator

•

CanvasFocusIndicator

 

The focus is related to the complete canvas. Paint the focus indicator using paintFocus()

•

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:

enum QwtPlotCanvas::PaintAttribute¶

Paint attributes. .IP "•" 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).

•

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:

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: See also:

void QwtPlotCanvas::drawContents (QPainter *painter) [protected], [virtual]¶

Redraw the canvas, and focus rect Parameters:

void QwtPlotCanvas::drawFocusIndicator (QPainter *painter) [protected], [virtual]¶

Draw the focus indication Parameters:

QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator () const¶

Returns: See also:

void QwtPlotCanvas::hideEvent (QHideEvent *event) [protected], [virtual]¶

Hide event Parameters:

void QwtPlotCanvas::paintEvent (QPaintEvent *event) [protected], [virtual]¶

Paint event Parameters:

void QwtPlotCanvas::replot ()¶

Invalidate the paint cache and repaint the canvas See also:

void QwtPlotCanvas::setFocusIndicator ( FocusIndicatorfocusIndicator)¶

Set the focus indicator See also:

void QwtPlotCanvas::setPaintAttribute ( PaintAttributeattribute, boolon = true)¶

Changing the paint attributes. Parameters: The default setting enables PaintCached and PaintPacked See also:

bool QwtPlotCanvas::testPaintAttribute ( PaintAttributeattribute) const¶

Test wether a paint attribute is enabled Parameters: Returns: See also:

Author¶

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