QwtPlotCanvas Class Reference

Collaboration diagram for QwtPlotCanvas:

Collaboration graph
[legend]

List of all members.


Detailed Description

Canvas of a QwtPlot.
See also:
QwtPlot

Definition at line 26 of file qwt_plot_canvas.h.


Public Types

enum  PaintAttribute {
  PaintCached = 1,
  PaintPacked = 2
}
enum  FocusIndicator {
  NoFocusIndicator,
  CanvasFocusIndicator,
  ItemFocusIndicator
}

Public Member Functions

 QwtPlotCanvas (QwtPlot *)
virtual ~QwtPlotCanvas ()
QwtPlotplot ()
const QwtPlotplot () const
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

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

Member Enumeration Documentation

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 53 of file qwt_plot_canvas.h.

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 77 of file qwt_plot_canvas.h.


Constructor & Destructor Documentation

QwtPlotCanvas::QwtPlotCanvas ( QwtPlot plot  )  [explicit]

Sets a cross cursor, enables QwtPlotCanvas::PaintCached.

Definition at line 50 of file qwt_plot_canvas.cpp.

References setPaintAttribute().

QwtPlotCanvas::~QwtPlotCanvas (  )  [virtual]

Destructor.

Definition at line 75 of file qwt_plot_canvas.cpp.


Member Function Documentation

QwtPlot * QwtPlotCanvas::plot (  ) 

Return parent plot widget.

Definition at line 81 of file qwt_plot_canvas.cpp.

Referenced by drawContents().

const QwtPlot * QwtPlotCanvas::plot (  )  const

Return parent plot widget.

Definition at line 91 of file qwt_plot_canvas.cpp.

void QwtPlotCanvas::setFocusIndicator ( FocusIndicator  focusIndicator  ) 

Set the focus indicator

See also:
FocusIndicator, focusIndicator

Definition at line 196 of file qwt_plot_canvas.cpp.

QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator (  )  const

Returns:
Focus indicator
See also:
FocusIndicator, setFocusIndicator

Definition at line 206 of file qwt_plot_canvas.cpp.

Referenced by drawContents().

void QwtPlotCanvas::setPaintAttribute ( PaintAttribute  attribute,
bool  on = 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()

Definition at line 110 of file qwt_plot_canvas.cpp.

Referenced by QwtPlotCanvas().

bool QwtPlotCanvas::testPaintAttribute ( PaintAttribute  attribute  )  const

Test wether a paint attribute is enabled

Parameters:
attribute Paint attribute
Returns:
true if the attribute is enabled
See also:
setPaintAttribute()

Definition at line 167 of file qwt_plot_canvas.cpp.

Referenced by QwtPlotCurve::draw(), and QwtPlot::replot().

QPixmap * QwtPlotCanvas::paintCache (  ) 

Return the paint cache, might be null.

Definition at line 173 of file qwt_plot_canvas.cpp.

Referenced by QwtPlotCurve::draw().

const QPixmap * QwtPlotCanvas::paintCache (  )  const

Return the paint cache, might be null.

Definition at line 179 of file qwt_plot_canvas.cpp.

void QwtPlotCanvas::invalidatePaintCache (  ) 

Invalidate the internal paint cache.

Definition at line 185 of file qwt_plot_canvas.cpp.

Referenced by QwtPlot::replot().

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

Paint event.

Definition at line 225 of file qwt_plot_canvas.cpp.

References drawContents().

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

Redraw the canvas, and focus rect.

Definition at line 250 of file qwt_plot_canvas.cpp.

References QwtPlot::autoReplot(), drawCanvas(), drawFocusIndicator(), focusIndicator(), plot(), and QwtPlot::setAutoReplot().

Referenced by paintEvent().

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

Draw the focus indication.

Definition at line 350 of file qwt_plot_canvas.cpp.

Referenced by drawContents().

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 281 of file qwt_plot_canvas.cpp.

Referenced by drawContents().


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