QwtPlotCanvas (3)

#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 *)

Canvas of a QwtPlot.

See also:

QwtPlot

enum \fBQwtPlotCanvas::FocusIndicator\fP

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:

setFocusIndicator(), focusIndicator(), paintFocus()

enum \fBQwtPlotCanvas::PaintAttribute\fP

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:

setPaintAttribute(), testPaintAttribute(), paintCache()

void QwtPlotCanvas::drawCanvas (QPainter *painter = \fCNULL\fP)\fC [protected]\fP

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)\fC [protected]\fP, \fC [virtual]\fP

Redraw the canvas, and focus rect

Parameters:

painter Painter

void QwtPlotCanvas::drawFocusIndicator (QPainter *painter)\fC [protected]\fP, \fC [virtual]\fP

Draw the focus indication

Parameters:

painter Painter

\fBQwtPlotCanvas::FocusIndicator\fP QwtPlotCanvas::focusIndicator () const

Returns:

Focus indicator

See also:

FocusIndicator, setFocusIndicator()

void QwtPlotCanvas::hideEvent (QHideEvent *event)\fC [protected]\fP, \fC [virtual]\fP

Hide event

Parameters:

event Hide event

void QwtPlotCanvas::paintEvent (QPaintEvent *event)\fC [protected]\fP, \fC [virtual]\fP

Paint event

Parameters:

event Paint event

void QwtPlotCanvas::replot ()

Invalidate the paint cache and repaint the canvas

See also:

invalidatePaintCache()

void QwtPlotCanvas::setFocusIndicator (\fBFocusIndicator\fPfocusIndicator)

Set the focus indicator

See also:

FocusIndicator, focusIndicator()

void QwtPlotCanvas::setPaintAttribute (\fBPaintAttribute\fPattribute, boolon = \fCtrue\fP)

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 (\fBPaintAttribute\fPattribute) const

Test wether a paint attribute is enabled

Parameters:

attribute Paint attribute

Returns:

true if the attribute is enabled

See also:

setPaintAttribute()

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