QwtPlotCanvas Class Reference

List of all members.

Detailed Description

Canvas of a QwtPlot.

See also:

Definition at line 28 of file qwt_plot_canvas.h.

Public Types

enum  PaintAttribute {
  PaintCached = 1,
  PaintPacked = 2
enum  FocusIndicator {

Public Member Functions

void setFocusIndicator (FocusIndicator)
FocusIndicator focusIndicator () const
void setPaintAttribute (PaintAttribute, bool on=true)
bool testPaintAttribute (PaintAttribute) const
QPixmap * paintCache ()
const QPixmap * paintCache () const
void invalidatePaintCache ()

Protected Member Functions

 QwtPlotCanvas (QwtPlot *)
virtual ~QwtPlotCanvas ()
virtual void hideEvent (QHideEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void drawContents (QPainter *)
virtual void drawFocusIndicator (QPainter *)
void drawCanvas (QPainter *painter=NULL)


class QwtPlot

Member Enumeration Documentation

enum QwtPlotCanvas::FocusIndicator

Focus indicator.

  • 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()

Definition at line 80 of file qwt_plot_canvas.h.

enum QwtPlotCanvas::PaintAttribute

Paint attributes.

  • 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()

Definition at line 56 of file qwt_plot_canvas.h.

Constructor & Destructor Documentation

QwtPlotCanvas::QwtPlotCanvas QwtPlot  )  [explicit, protected]

Sets a cross cursor, enables QwtPlotCanvas::PaintCached.

Definition at line 50 of file qwt_plot_canvas.cpp.

References setPaintAttribute().

QwtPlotCanvas::~QwtPlotCanvas  )  [protected, virtual]


Definition at line 75 of file qwt_plot_canvas.cpp.

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.

See also:
QwtPlot::drawCanvas, setPaintAttributes(), testPaintAttributes()

Definition at line 251 of file qwt_plot_canvas.cpp.

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

Redraw the canvas, and focus rect.

Definition at line 228 of file qwt_plot_canvas.cpp.

Referenced by paintEvent().

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

Draw the focus indication.

Definition at line 320 of file qwt_plot_canvas.cpp.

References QwtPainter::drawFocusRect().

QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator  )  const

Focus indicator
See also:
FocusIndicator, setFocusIndicator

Definition at line 185 of file qwt_plot_canvas.cpp.

void QwtPlotCanvas::invalidatePaintCache  ) 

Invalidate the internal paint cache.

Definition at line 164 of file qwt_plot_canvas.cpp.

Referenced by QwtPlot::replot().

const QPixmap * QwtPlotCanvas::paintCache  )  const

Return the paint cache, might be null.

Definition at line 158 of file qwt_plot_canvas.cpp.

QPixmap * QwtPlotCanvas::paintCache  ) 

Return the paint cache, might be null.

Definition at line 152 of file qwt_plot_canvas.cpp.

void QwtPlotCanvas::setFocusIndicator FocusIndicator  focusIndicator  ) 

Set the focus indicator

See also:
FocusIndicator, focusIndicator

Definition at line 175 of file qwt_plot_canvas.cpp.

void QwtPlotCanvas::setPaintAttribute PaintAttribute  attribute,
bool  on = true

Changing the paint attributes.

attribute Paint attribute
on On/Off
The default setting enables PaintCached and PaintPacked

See also:
testPaintAttribute(), drawCanvas(), drawContents(), paintCache()

Definition at line 90 of file qwt_plot_canvas.cpp.

Referenced by QwtPlotCanvas().

bool QwtPlotCanvas::testPaintAttribute PaintAttribute  attribute  )  const

Test wether a paint attribute is enabled

attribute Paint attribute
true if the attribute is enabled

Definition at line 146 of file qwt_plot_canvas.cpp.

Referenced by QwtPlot::replot().

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