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Qwt User's Guide
6.1.4
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A plot item, which displays a text label. More...
#include <qwt_plot_textlabel.h>

Public Member Functions | |
| QwtPlotTextLabel () | |
| Constructor. More... | |
| virtual | ~QwtPlotTextLabel () |
| Destructor. | |
| virtual int | rtti () const |
| void | setText (const QwtText &) |
| QwtText | text () const |
| void | setMargin (int margin) |
| int | margin () const |
| virtual QRectF | textRect (const QRectF &, const QSizeF &) const |
| Align the text label. More... | |
Public Member Functions inherited from QwtPlotItem | |
| QwtPlotItem (const QwtText &title=QwtText()) | |
| virtual | ~QwtPlotItem () |
| Destroy the QwtPlotItem. | |
| void | attach (QwtPlot *plot) |
| Attach the item to a plot. More... | |
| void | detach () |
| This method detaches a QwtPlotItem from any QwtPlot it has been associated with. More... | |
| QwtPlot * | plot () const |
| Return attached plot. | |
| void | setTitle (const QString &title) |
| void | setTitle (const QwtText &title) |
| const QwtText & | title () const |
| void | setItemAttribute (ItemAttribute, bool on=true) |
| bool | testItemAttribute (ItemAttribute) const |
| void | setItemInterest (ItemInterest, bool on=true) |
| bool | testItemInterest (ItemInterest) const |
| void | setRenderHint (RenderHint, bool on=true) |
| bool | testRenderHint (RenderHint) const |
| void | setRenderThreadCount (uint numThreads) |
| uint | renderThreadCount () const |
| void | setLegendIconSize (const QSize &) |
| QSize | legendIconSize () const |
| double | z () const |
| void | setZ (double z) |
| Set the z value. More... | |
| void | show () |
| Show the item. | |
| void | hide () |
| Hide the item. | |
| virtual void | setVisible (bool) |
| bool | isVisible () const |
| void | setAxes (int xAxis, int yAxis) |
| void | setXAxis (int axis) |
| int | xAxis () const |
| Return xAxis. | |
| void | setYAxis (int axis) |
| int | yAxis () const |
| Return yAxis. | |
| virtual void | itemChanged () |
| virtual void | legendChanged () |
| virtual QRectF | boundingRect () const |
| virtual void | getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const |
| Calculate a hint for the canvas margin. More... | |
| virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) |
| Update the item to changes of the axes scale division. More... | |
| virtual void | updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &) |
| Update the item to changes of the legend info. More... | |
| QRectF | scaleRect (const QwtScaleMap &, const QwtScaleMap &) const |
| Calculate the bounding scale rectangle of 2 maps. More... | |
| QRectF | paintRect (const QwtScaleMap &, const QwtScaleMap &) const |
| Calculate the bounding paint rectangle of 2 maps. More... | |
| virtual QList< QwtLegendData > | legendData () const |
| Return all information, that is needed to represent the item on the legend. More... | |
| virtual QwtGraphic | legendIcon (int index, const QSizeF &) const |
Protected Member Functions | |
| virtual void | draw (QPainter *, const QwtScaleMap &, const QwtScaleMap &, const QRectF &) const |
| void | invalidateCache () |
| Invalidate all internal cache. | |
Protected Member Functions inherited from QwtPlotItem | |
| QwtGraphic | defaultIcon (const QBrush &, const QSizeF &) const |
| Return a default icon from a brush. More... | |
Additional Inherited Members | |
Public Types inherited from QwtPlotItem | |
| enum | RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotTradingCurve, Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel, Rtti_PlotZone, Rtti_PlotUserItem = 1000 } |
| Runtime type information. More... | |
| enum | ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 } |
| Plot Item Attributes. More... | |
| enum | ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 } |
| Plot Item Interests. More... | |
| enum | RenderHint { RenderAntialiased = 0x1 } |
| Render hints. More... | |
| typedef QFlags< ItemAttribute > | ItemAttributes |
| Plot Item Attributes. | |
| typedef QFlags< ItemInterest > | ItemInterests |
| Plot Item Interests. | |
| typedef QFlags< RenderHint > | RenderHints |
| Render hints. | |
A plot item, which displays a text label.
QwtPlotTextLabel displays a text label aligned to the plot canvas.
In opposite to QwtPlotMarker the position of the label is unrelated to plot coordinates.
As drawing a text is an expensive operation the label is cached in a pixmap to speed up replots.
| QwtPlotTextLabel::QwtPlotTextLabel | ( | ) |
Constructor.
Initializes an text label with an empty text
Sets the following item attributes:
The z value is initialized by 150
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protectedvirtual |
Draw the text label
| painter | Painter |
| xMap | x Scale Map |
| yMap | y Scale Map |
| canvasRect | Contents rectangle of the canvas in painter coordinates |
Implements QwtPlotItem.
| int QwtPlotTextLabel::margin | ( | ) | const |
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virtual |
Reimplemented from QwtPlotItem.
| void QwtPlotTextLabel::setMargin | ( | int | margin | ) |
Set the margin
The margin is the distance between the contentsRect() of the plot canvas and the rectangle where the label can be displayed.
| margin | Margin |
| void QwtPlotTextLabel::setText | ( | const QwtText & | text | ) |
Set the text
The label will be aligned to the plot canvas according to the alignment flags of text.
| text | Text to be displayed |
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virtual |
Align the text label.
| rect | Canvas rectangle with margins subtracted |
| textSize | Size required to draw the text |