Qwt User's Guide 5.2.2
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A class for drawing markers. More...
#include <qwt_plot_marker.h>
Public Types | |
enum | ItemAttribute { Legend = 1, AutoScale = 2 } |
enum | LineStyle { NoLine, HLine, VLine, Cross } |
enum | RenderHint { RenderAntialiased = 1 } |
enum | RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotUserItem = 1000 } |
Public Member Functions | |
void | attach (QwtPlot *plot) |
virtual QwtDoubleRect | boundingRect () const |
void | detach () |
virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const |
void | hide () |
QwtDoubleRect | invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const |
bool | isVisible () const |
virtual void | itemChanged () |
QwtText | label () const |
Qt::Alignment | labelAlignment () const |
Qt::Orientation | labelOrientation () const |
virtual QWidget * | legendItem () const |
const QPen & | linePen () const |
LineStyle | lineStyle () const |
QRect | paintRect (const QwtScaleMap &, const QwtScaleMap &) const |
QwtPlot * | plot () const |
QwtPlotMarker () | |
virtual int | rtti () const |
QwtDoubleRect | scaleRect (const QwtScaleMap &, const QwtScaleMap &) const |
void | setAxis (int xAxis, int yAxis) |
void | setItemAttribute (ItemAttribute, bool on=true) |
void | setLabel (const QwtText &) |
void | setLabelAlignment (Qt::Alignment) |
void | setLabelOrientation (Qt::Orientation) |
void | setLinePen (const QPen &p) |
void | setLineStyle (LineStyle st) |
void | setRenderHint (RenderHint, bool on=true) |
void | setSpacing (int) |
void | setSymbol (const QwtSymbol &s) |
void | setTitle (const QString &title) |
void | setTitle (const QwtText &title) |
void | setValue (double, double) |
void | setValue (const QwtDoublePoint &) |
virtual void | setVisible (bool) |
void | setXAxis (int axis) |
void | setXValue (double) |
void | setYAxis (int axis) |
void | setYValue (double) |
void | setZ (double z) |
void | show () |
int | spacing () const |
const QwtSymbol & | symbol () const |
bool | testItemAttribute (ItemAttribute) const |
bool | testRenderHint (RenderHint) const |
const QwtText & | title () const |
QRect | transform (const QwtScaleMap &, const QwtScaleMap &, const QwtDoubleRect &) const |
virtual void | updateLegend (QwtLegend *) const |
virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) |
QwtDoublePoint | value () const |
int | xAxis () const |
double | xValue () const |
int | yAxis () const |
double | yValue () const |
double | z () const |
virtual | ~QwtPlotMarker () |
Protected Member Functions | |
void | drawAt (QPainter *, const QRect &, const QPoint &) const |
A class for drawing markers.
A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.
The QwtPlotMarker::setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.
With QwtPlotMarker::setLabel(), a label can be assigned to the marker. The QwtPlotMarker::setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to AlignLeft|AlignTop.
enum QwtPlotItem::ItemAttribute [inherited] |
Plot Item Attributes
Line styles.
enum QwtPlotItem::RenderHint [inherited] |
Render hints.
enum QwtPlotItem::RttiValues [inherited] |
Runtime type information.
RttiValues is used to cast plot items, without having to enable runtime type information of the compiler.
QwtPlotMarker::QwtPlotMarker | ( | ) | [explicit] |
Sets alignment to Qt::AlignCenter, and style to NoLine.
QwtPlotMarker::~QwtPlotMarker | ( | ) | [virtual] |
Destructor.
void QwtPlotItem::attach | ( | QwtPlot * | plot | ) | [inherited] |
Attach the item to a plot.
This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to.
plot | Plot widget |
QwtDoubleRect QwtPlotMarker::boundingRect | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
void QwtPlotItem::detach | ( | ) | [inline, inherited] |
This method detaches a QwtPlotItem from any QwtPlot it has been associated with.
detach() is equivalent to calling attach( NULL )
void QwtPlotMarker::draw | ( | QPainter * | painter, |
const QwtScaleMap & | xMap, | ||
const QwtScaleMap & | yMap, | ||
const QRect & | canvasRect | ||
) | const [virtual] |
Draw the marker
painter | Painter |
xMap | x Scale Map |
yMap | y Scale Map |
canvasRect | Contents rect of the canvas in painter coordinates |
Implements QwtPlotItem.
void QwtPlotMarker::drawAt | ( | QPainter * | painter, |
const QRect & | canvasRect, | ||
const QPoint & | pos | ||
) | const [protected] |
Draw the marker at a specific position
painter | Painter |
canvasRect | Contents rect of the canvas in painter coordinates |
pos | Position of the marker in painter coordinates |
void QwtPlotItem::hide | ( | ) | [inherited] |
Hide the item.
QwtDoubleRect QwtPlotItem::invTransform | ( | const QwtScaleMap & | xMap, |
const QwtScaleMap & | yMap, | ||
const QRect & | rect | ||
) | const [inherited] |
Transform a rectangle from paint to scale coordinates
xMap | X map |
yMap | Y map |
rect | Rectangle in paint coordinates |
bool QwtPlotItem::isVisible | ( | ) | const [inherited] |
void QwtPlotItem::itemChanged | ( | ) | [virtual, inherited] |
Update the legend and call QwtPlot::autoRefresh for the parent plot.
QwtText QwtPlotMarker::label | ( | ) | const |
Qt::Alignment QwtPlotMarker::labelAlignment | ( | ) | const |
Qt::Orientation QwtPlotMarker::labelOrientation | ( | ) | const |
QWidget * QwtPlotItem::legendItem | ( | ) | const [virtual, inherited] |
Allocate the widget that represents the item on the legend.
The default implementation is made for QwtPlotCurve and returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().
Implements QwtLegendItemManager.
const QPen & QwtPlotMarker::linePen | ( | ) | const |
QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle | ( | ) | const |
QRect QwtPlotItem::paintRect | ( | const QwtScaleMap & | xMap, |
const QwtScaleMap & | yMap | ||
) | const [inherited] |
Calculate the bounding paint rect of 2 maps.
xMap | X map |
yMap | X map |
QwtPlot * QwtPlotItem::plot | ( | ) | const [inherited] |
Return attached plot.
int QwtPlotMarker::rtti | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
QwtDoubleRect QwtPlotItem::scaleRect | ( | const QwtScaleMap & | xMap, |
const QwtScaleMap & | yMap | ||
) | const [inherited] |
Calculate the bounding scale rect of 2 maps.
xMap | X map |
yMap | X map |
void QwtPlotItem::setAxis | ( | int | xAxis, |
int | yAxis | ||
) | [inherited] |
Set X and Y axis
The item will painted according to the coordinates its Axes.
xAxis | X Axis |
yAxis | Y Axis |
void QwtPlotItem::setItemAttribute | ( | ItemAttribute | attribute, |
bool | on = true |
||
) | [inherited] |
Toggle an item attribute
attribute | Attribute type |
on | true/false |
void QwtPlotMarker::setLabel | ( | const QwtText & | label | ) |
void QwtPlotMarker::setLabelAlignment | ( | Qt::Alignment | align | ) |
Set the alignment of the label.
In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.
In all other styles the alignment is relative to the marker's position.
align | Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter. |
void QwtPlotMarker::setLabelOrientation | ( | Qt::Orientation | orientation | ) |
Set the orientation of the label.
When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).
orientation | Orientation of the label |
void QwtPlotMarker::setLinePen | ( | const QPen & | pen | ) |
Specify a pen for the line.
The width of non cosmetic pens is scaled according to the resolution of the paint device.
pen | New pen |
void QwtPlotMarker::setLineStyle | ( | QwtPlotMarker::LineStyle | st | ) |
Set the line style.
st | Line style. Can be one of QwtPlotMarker::NoLine, HLine, VLine or Cross |
void QwtPlotItem::setRenderHint | ( | RenderHint | hint, |
bool | on = true |
||
) | [inherited] |
Toggle an render hint
hint | Render hint |
on | true/false |
void QwtPlotMarker::setSpacing | ( | int | spacing | ) |
Set the spacing.
When the label is not centered on the marker position, the spacing is the distance between the position and the label.
spacing | Spacing |
void QwtPlotMarker::setSymbol | ( | const QwtSymbol & | s | ) |
void QwtPlotItem::setTitle | ( | const QString & | title | ) | [inherited] |
void QwtPlotItem::setTitle | ( | const QwtText & | title | ) | [inherited] |
void QwtPlotMarker::setValue | ( | const QwtDoublePoint & | pos | ) |
Set Value.
void QwtPlotMarker::setValue | ( | double | x, |
double | y | ||
) |
Set Value.
void QwtPlotItem::setVisible | ( | bool | on | ) | [virtual, inherited] |
void QwtPlotItem::setXAxis | ( | int | axis | ) | [inherited] |
Set the X axis
The item will painted according to the coordinates its Axes.
axis | X Axis |
void QwtPlotMarker::setXValue | ( | double | x | ) |
Set X Value.
void QwtPlotItem::setYAxis | ( | int | axis | ) | [inherited] |
Set the Y axis
The item will painted according to the coordinates its Axes.
axis | Y Axis |
void QwtPlotMarker::setYValue | ( | double | y | ) |
Set Y Value.
void QwtPlotItem::setZ | ( | double | z | ) | [inherited] |
Set the z value.
Plot items are painted in increasing z-order.
z | Z-value |
void QwtPlotItem::show | ( | ) | [inherited] |
Show the item.
int QwtPlotMarker::spacing | ( | ) | const |
const QwtSymbol & QwtPlotMarker::symbol | ( | ) | const |
bool QwtPlotItem::testItemAttribute | ( | ItemAttribute | attribute | ) | const [inherited] |
Test an item attribute
attribute | Attribute type |
bool QwtPlotItem::testRenderHint | ( | RenderHint | hint | ) | const [inherited] |
Test a render hint
hint | Render hint |
const QwtText & QwtPlotItem::title | ( | ) | const [inherited] |
QRect QwtPlotItem::transform | ( | const QwtScaleMap & | xMap, |
const QwtScaleMap & | yMap, | ||
const QwtDoubleRect & | rect | ||
) | const [inherited] |
Transform a rectangle
xMap | X map |
yMap | Y map |
rect | Rectangle in scale coordinates |
void QwtPlotItem::updateLegend | ( | QwtLegend * | legend | ) | const [virtual, inherited] |
Update the widget that represents the item on the legend.
updateLegend() is called from itemChanged() to adopt the widget representing the item on the legend to its new configuration.
The default implementation is made for QwtPlotCurve and updates a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().
legend | Legend |
Implements QwtLegendItemManager.
Reimplemented in QwtPlotCurve.
void QwtPlotItem::updateScaleDiv | ( | const QwtScaleDiv & | , |
const QwtScaleDiv & | |||
) | [virtual, inherited] |
Update the item to changes of the axes scale division.
Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()
xScaleDiv | Scale division of the x-axis |
yScaleDiv | Scale division of the y-axis |
Reimplemented in QwtPlotGrid, and QwtPlotScaleItem.
QwtDoublePoint QwtPlotMarker::value | ( | ) | const |
Return Value.
int QwtPlotItem::xAxis | ( | ) | const [inherited] |
Return xAxis.
double QwtPlotMarker::xValue | ( | ) | const |
Return x Value.
int QwtPlotItem::yAxis | ( | ) | const [inherited] |
Return yAxis.
double QwtPlotMarker::yValue | ( | ) | const |
Return y Value.
double QwtPlotItem::z | ( | ) | const [inherited] |
Plot items are painted in increasing z-order.