NAME¶

QwtPlotCanvas - 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:

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:

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: 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::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:

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:

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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