QwtPlotGrid(3) Qwt User's Guide QwtPlotGrid(3)NAMEQwtPlotGrid-
A class which draws a coordinate grid.
SYNOPSIS
#include <qwt_plot_grid.h>
Inherits QwtPlotItem.
Public Types
enum ItemAttribute { Legend = 1, AutoScale = 2 }
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 &rect) const
void enableX (bool tf)
void enableXMin (bool tf)
void enableY (bool tf)
void enableYMin (bool tf)
void hide ()
QwtDoubleRect invTransform (const QwtScaleMap &, const QwtScaleMap &,
const QRect &) const
bool isVisible () const
virtual void itemChanged ()
virtual QWidget * legendItem () const
const QPen & majPen () const
const QPen & minPen () const
QRect paintRect (const QwtScaleMap &, const QwtScaleMap &) const
QwtPlot * plot () const
QwtPlotGrid ()
virtual int rtti () const
QwtDoubleRect scaleRect (const QwtScaleMap &, const QwtScaleMap &)
const
void setAxis (int xAxis, int yAxis)
void setItemAttribute (ItemAttribute, bool on=true)
void setMajPen (const QPen &p)
void setMinPen (const QPen &p)
void setPen (const QPen &p)
void setRenderHint (RenderHint, bool on=true)
void setTitle (const QString &title)
void setTitle (const QwtText &title)
virtual void setVisible (bool)
void setXAxis (int axis)
void setXDiv (const QwtScaleDiv &sx)
void setYAxis (int axis)
void setYDiv (const QwtScaleDiv &sy)
void setZ (double z)
void show ()
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 &xMap, const QwtScaleDiv
&yMap)
int xAxis () const
bool xEnabled () const
bool xMinEnabled () const
const QwtScaleDiv & xScaleDiv () const
int yAxis () const
bool yEnabled () const
bool yMinEnabled () const
const QwtScaleDiv & yScaleDiv () const
double z () const
virtual ~QwtPlotGrid ()
Detailed Description
A class which draws a coordinate grid.
The QwtPlotGrid class can be used to draw a coordinate grid. A
coordinate grid consists of major and minor vertical and horizontal
gridlines. The locations of the gridlines are determined by the X and Y
scale divisions which can be assigned with setXDiv() and setYDiv(). The
draw() member draws the grid within a bounding rectangle.
Member Enumeration Documentation
enum QwtPlotItem::ItemAttribute [inherited] Plot Item Attributes
· Legend
The item is represented on the legend.
· AutoScale
The boundingRect() of the item is included in the autoscaling
calculation.
See also:
setItemAttribute(), testItemAttribute()
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.
Constructor & Destructor Documentation
QwtPlotGrid::QwtPlotGrid () [explicit]
Enables major grid, disables minor grid.
QwtPlotGrid::~QwtPlotGrid () [virtual]
Destructor.
Member Function Documentation
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.
Parameters:
plot Plot widget
See also:
QwtPlotItem::detach()
QwtDoubleRect QwtPlotItem::boundingRect () const [virtual, inherited]
Returns:
An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)
Reimplemented in QwtPlotCurve, QwtPlotMarker, QwtPlotSpectrogram, and
QwtPlotSvgItem.
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 )
See also:
attach( QwtPlot* plot )
void QwtPlotGrid::draw (QPainter *painter, const QwtScaleMap &xMap, const
QwtScaleMap &yMap, const QRect &canvasRect) const [virtual]
Draw the grid. The grid is drawn into the bounding rectangle such that
gridlines begin and end at the rectangle's borders. The X and Y maps
are used to map the scale divisions into the drawing region screen.
Parameters:
painter Painter
xMap X axis map
yMap Y axis
canvasRect Contents rect of the plot canvas
Implements QwtPlotItem.
void QwtPlotGrid::enableX (booltf)
Enable or disable vertical gridlines. Parameters:
tf Enable (true) or disable
See also:
Minor gridlines can be enabled or disabled with enableXMin()
void QwtPlotGrid::enableXMin (booltf)
Enable or disable minor vertical gridlines. Parameters:
tf Enable (true) or disable
See also:
enableX()
void QwtPlotGrid::enableY (booltf)
Enable or disable horizontal gridlines. Parameters:
tf Enable (true) or disable
See also:
Minor gridlines can be enabled or disabled with enableYMin()
void QwtPlotGrid::enableYMin (booltf)
Enable or disable minor horizontal gridlines. Parameters:
tf Enable (true) or disable
See also:
enableY()
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
Parameters:
xMap X map
yMap Y map
rect Rectangle in paint coordinates
Returns:
Rectangle in scale coordinates
See also:
transform()
bool QwtPlotItem::isVisible () const [inherited] Returns:
true if visible
See also:
setVisible(), show(), hide()
void QwtPlotItem::itemChanged () [virtual, inherited] Update the legend and
call QwtPlot::autoRefresh for the parent plot.
See also:
updateLegend()
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().
Returns:
QwtLegendItem()
See also:
updateLegend()QwtLegend()
Implements QwtLegendItemManager.
const QPen & QwtPlotGrid::majPen () const Returns:
the pen for the major gridlines
See also:
setMajPen(), setMinPen(), setPen()
const QPen & QwtPlotGrid::minPen () const Returns:
the pen for the minor gridlines
See also:
setMinPen(), setMajPen(), setPen()
QRect QwtPlotItem::paintRect (const QwtScaleMap &xMap, const QwtScaleMap
&yMap) const [inherited]
Calculate the bounding paint rect of 2 maps. Parameters:
xMap X map
yMap X map
Returns:
Bounding rect of the scale maps
QwtPlot * QwtPlotItem::plot () const [inherited]
Return attached plot.
int QwtPlotGrid::rtti () const [virtual] Returns:
QwtPlotItem::Rtti_PlotGrid
Reimplemented from QwtPlotItem.
QwtDoubleRect QwtPlotItem::scaleRect (const QwtScaleMap &xMap, const
QwtScaleMap &yMap) const [inherited]
Calculate the bounding scale rect of 2 maps. Parameters:
xMap X map
yMap X map
Returns:
Bounding rect of the scale maps
void QwtPlotItem::setAxis (intxAxis, intyAxis) [inherited] Set X and Y axis
The item will painted according to the coordinates its Axes.
Parameters:
xAxis X Axis
yAxis Y Axis
See also:
setXAxis(), setYAxis(), xAxis(), yAxis()
void QwtPlotItem::setItemAttribute (ItemAttributeattribute, boolon = true)
[inherited] Toggle an item attribute
Parameters:
attribute Attribute type
on true/false
See also:
testItemAttribute(), ItemAttribute
void QwtPlotGrid::setMajPen (const QPen &pen) Assign a pen for the major
gridlines
The width of non cosmetic pens is scaled according to the resolution of
the paint device.
Parameters:
pen Pen
See also:
majPen(), setMinPen(), setPen(), QwtPainter::scaledPen()
void QwtPlotGrid::setMinPen (const QPen &pen) Assign a pen for the minor
gridlines
The width of non cosmetic pens is scaled according to the resolution of
the paint device.
Parameters:
pen Pen
See also:
minPen(), setMajPen(), setPen(), QwtPainter::scaledPen()
void QwtPlotGrid::setPen (const QPen &pen) Assign a pen for both major and
minor gridlines
The width of non cosmetic pens is scaled according to the resolution of
the paint device.
Parameters:
pen Pen
See also:
setMajPen(), setMinPen(), QwtPainter::scaledPen()
void QwtPlotItem::setRenderHint (RenderHinthint, boolon = true) [inherited]
Toggle an render hint
Parameters:
hint Render hint
on true/false
See also:
testRenderHint(), RenderHint
void QwtPlotItem::setTitle (const QwtText &title) [inherited] Set a new
title
Parameters:
title Title
See also:
title()
void QwtPlotItem::setTitle (const QString &title) [inherited] Set a new
title
Parameters:
title Title
See also:
title()
void QwtPlotItem::setVisible (boolon) [virtual, inherited] Show/Hide the
item
Parameters:
on Show if true, otherwise hide
See also:
isVisible(), show(), hide()
void QwtPlotItem::setXAxis (intaxis) [inherited] Set the X axis
The item will painted according to the coordinates its Axes.
Parameters:
axis X Axis
See also:
setAxis(), setYAxis(), xAxis()
void QwtPlotGrid::setXDiv (const QwtScaleDiv &scaleDiv) Assign an x axis
scale division
Parameters:
scaleDiv Scale division
void QwtPlotItem::setYAxis (intaxis) [inherited] Set the Y axis
The item will painted according to the coordinates its Axes.
Parameters:
axis Y Axis
See also:
setAxis(), setXAxis(), yAxis()
void QwtPlotGrid::setYDiv (const QwtScaleDiv &scaleDiv) Assign a y axis
division
Parameters:
scaleDiv Scale division
void QwtPlotItem::setZ (doublez) [inherited]
Set the z value. Plot items are painted in increasing z-order.
Parameters:
z Z-value
See also:
z(), QwtPlotDict::itemList()
void QwtPlotItem::show () [inherited]
Show the item.
bool QwtPlotItem::testItemAttribute (ItemAttributeattribute) const
[inherited] Test an item attribute
Parameters:
attribute Attribute type
Returns:
true/false
See also:
setItemAttribute(), ItemAttribute
bool QwtPlotItem::testRenderHint (RenderHinthint) const [inherited] Test a
render hint
Parameters:
hint Render hint
Returns:
true/false
See also:
setRenderHint(), RenderHint
const QwtText & QwtPlotItem::title () const [inherited] Returns:
Title of the item
See also:
setTitle()
QRect QwtPlotItem::transform (const QwtScaleMap &xMap, const QwtScaleMap
&yMap, const QwtDoubleRect &rect) const [inherited] Transform a
rectangle
Parameters:
xMap X map
yMap Y map
rect Rectangle in scale coordinates
Returns:
Rectangle in paint coordinates
See also:
invTransform()
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().
Parameters:
legend Legend
See also:
legendItem(), itemChanged(), QwtLegend()
Implements QwtLegendItemManager.
Reimplemented in QwtPlotCurve.
void QwtPlotGrid::updateScaleDiv (const QwtScaleDiv &xScaleDiv, const
QwtScaleDiv &yScaleDiv) [virtual] Update the grid to changes of the
axes scale division
Parameters:
xScaleDiv Scale division of the x-axis
yScaleDiv Scale division of the y-axis
See also:
QwtPlot::updateAxes()
Reimplemented from QwtPlotItem.
int QwtPlotItem::xAxis () const [inherited]
Return xAxis.
bool QwtPlotGrid::xEnabled () const Returns:
true if vertical gridlines are enabled
See also:
enableX()
bool QwtPlotGrid::xMinEnabled () const Returns:
true if minor vertical gridlines are enabled
See also:
enableXMin()
const QwtScaleDiv & QwtPlotGrid::xScaleDiv () const Returns:
the scale division of the x axis
int QwtPlotItem::yAxis () const [inherited]
Return yAxis.
bool QwtPlotGrid::yEnabled () const Returns:
true if horizontal gridlines are enabled
See also:
enableY()
bool QwtPlotGrid::yMinEnabled () const Returns:
true if minor horizontal gridlines are enabled
See also:
enableYMin()
const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const Returns:
the scale division of the y axis
double QwtPlotItem::z () const [inherited] Plot items are painted in
increasing z-order.
Returns:
setZ(), QwtPlotDict::itemList()Author
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Version 5.2.2 Mon Aug 1 2011 QwtPlotGrid(3)
