#include <qwt_plot_canvas.h>
List of all members.
Detailed Description
Canvas of a QwtPlot.
Canvas is the widget where all plot items are displayed
- See also:
- QwtPlot
Member Enumeration Documentation
Focus indicator The default setting is NoFocusIndicator.
- See also:
- setFocusIndicator(), focusIndicator(), paintFocus()
- Enumerator:
NoFocusIndicator |
Don't paint a focus indicator.
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CanvasFocusIndicator |
The focus is related to the complete canvas. Paint the focus indicator using paintFocus()
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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.
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Paint attributes.
The default setting enables BackingStore and Opaque.
- See also:
- setPaintAttribute(), testPaintAttribute()
- Enumerator:
BackingStore |
Paint double buffered reusing the content of the pixmap buffer when possible.
Using a backing store might improve the performance significantly, when workin with widget overlays ( like rubberbands ). Disabling the cache might improve the performance for incremental paints (using QwtPlotDirectPainter ).
- See also:
- backingStore(), invalidateBackingStore()
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Opaque |
Try to fill the complete contents rectangle of the plot canvas.
When using styled backgrounds Qt assumes, that the canvas doesn't fill its area completely ( f.e because of rounded borders ) and fills the area below the canvas. When this is done with gradients it might result in a serious performance bottleneck - depending on the size.
When the Opaque attribute is enabled the canvas tries to identify the gaps with some heuristics and to fill those only.
- Warning:
- Will not work for semitransparent backgrounds
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HackStyledBackground |
Try to improve painting of styled backgrounds.
QwtPlotCanvas supports the box model attributes for customizing the layout with style sheets. Unfortunately the design of Qt style sheets has no concept how to handle backgrounds with rounded corners - beside of padding.
When HackStyledBackground is enabled the plot canvas tries to seperate the background from the background border by reverse engeneering to paint the background before and the border after the plot items. In this order the border gets prefectly antialiased and you can avoid some pixel artifacts in the corners.
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ImmediatePaint |
When ImmediatePaint is set replot() calls repaint() instead of update().
- See also:
- replot(), QWidget::repaint(), QWidget::update()
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Constructor & Destructor Documentation
QwtPlotCanvas::QwtPlotCanvas |
( |
QwtPlot * |
plot | ) |
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explicit |
Member Function Documentation
const QPixmap * QwtPlotCanvas::backingStore |
( |
| ) |
const |
- Returns:
- Backing store, might be null
QBitmap QwtPlotCanvas::borderMask |
( |
const QSize & |
size | ) |
const |
Calculate a mask, that can be used to clip away the border frame
- Parameters:
-
size | Size including the frame |
QPainterPath QwtPlotCanvas::borderPath |
( |
const QRect & |
rect | ) |
const |
Calculate the painter path for a styled or rounded border
When the canvas has no styled background or rounded borders the painter path is empty.
- Parameters:
-
rect | Bounding rectangle of the canvas |
- Returns:
- Painter path, that can be used for clipping
double QwtPlotCanvas::borderRadius |
( |
| ) |
const |
void QwtPlotCanvas::drawBorder |
( |
QPainter * |
painter | ) |
|
|
protectedvirtual |
Draw the border of the plot canvas
- Parameters:
-
- See also:
- setBorderRadius(), QFrame::drawFrame()
void QwtPlotCanvas::drawFocusIndicator |
( |
QPainter * |
painter | ) |
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protectedvirtual |
Draw the focus indication
- Parameters:
-
bool QwtPlotCanvas::event |
( |
QEvent * |
event | ) |
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virtual |
Qt event handler for QEvent::PolishRequest and QEvent::StyleChange
- Parameters:
-
void QwtPlotCanvas::paintEvent |
( |
QPaintEvent * |
event | ) |
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protectedvirtual |
void QwtPlotCanvas::replot |
( |
| ) |
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Invalidate the paint cache and repaint the canvas
- See also:
- invalidatePaintCache()
void QwtPlotCanvas::resizeEvent |
( |
QResizeEvent * |
event | ) |
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protectedvirtual |
void QwtPlotCanvas::setBorderRadius |
( |
double |
radius | ) |
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Set the radius for the corners of the border frame
- Parameters:
-
radius | Radius of a rounded corner |
- See also:
- borderRadius()
void QwtPlotCanvas::setFocusIndicator |
( |
FocusIndicator |
focusIndicator | ) |
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void QwtPlotCanvas::setPaintAttribute |
( |
PaintAttribute |
attribute, |
|
|
bool |
on = true |
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) |
| |
bool QwtPlotCanvas::testPaintAttribute |
( |
PaintAttribute |
attribute | ) |
const |
Test wether a paint attribute is enabled
- Parameters:
-
- Returns:
- true if the attribute is enabled
- See also:
- setPaintAttribute()