QwtPlotCanvas(3) Qwt User's Guide QwtPlotCanvas(3)NAMEQwtPlotCanvas-
Canvas of a QwtPlot.
SYNOPSIS
#include <qwt_plot_canvas.h>
Public Types
enum FocusIndicator { NoFocusIndicator, CanvasFocusIndicator,
ItemFocusIndicator }
enum PaintAttribute { PaintCached = 1, PaintPacked = 2 }
Public Member Functions
FocusIndicator focusIndicator () const
void invalidatePaintCache ()
QPixmap * paintCache ()
const QPixmap * paintCache () const
const QwtPlot * plot () const
QwtPlot * plot ()
QwtPlotCanvas (QwtPlot *)
void replot ()
void setFocusIndicator (FocusIndicator)
void setPaintAttribute (PaintAttribute, bool on=true)
bool testPaintAttribute (PaintAttribute) const
virtual ~QwtPlotCanvas ()
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 "·" 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 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:
setPaintAttribute(), testPaintAttribute(), paintCache()Constructor & Destructor Documentation
QwtPlotCanvas::QwtPlotCanvas (QwtPlot *plot) [explicit]
Sets a cross cursor, enables QwtPlotCanvas::PaintCached.
QwtPlotCanvas::~QwtPlotCanvas () [virtual]
Destructor.
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::invalidatePaintCache ()
Invalidate the internal paint cache.
const QPixmap * QwtPlotCanvas::paintCache () const
Return the paint cache, might be null.
QPixmap * QwtPlotCanvas::paintCache ()
Return the paint cache, might be null.
void QwtPlotCanvas::paintEvent (QPaintEvent *event) [protected, virtual]
Paint event
Parameters:
event Paint event
const QwtPlot * QwtPlotCanvas::plot () const
Return parent plot widget.
QwtPlot * QwtPlotCanvas::plot ()
Return parent plot widget.
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
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Version 5.2.2 Mon Aug 1 2011 QwtPlotCanvas(3)
