QwtPlotGrid man page

QwtPlotGrid —

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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Info

Mon Aug 1 2011 Version 5.2.2 Qwt User's Guide