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QwtPlot Class Reference

List of all members.

Detailed Description

A 2-D plotting widget.

QwtPlot is a widget for plotting two-dimensional graphs. An unlimited number of data pairs can be displayed as curves in different styles and colors. A plot can have up to four axes, with each curve attached to an x- and a y axis. The scales at the axes are dimensioned automatically using an algorithm which can be configured separately for each axis. Linear and logarithmic scaling is supported. Markers of different styles can be added to the plot.

Curves and markers are identified by unique keys which are generated automatically when a curve or a marker is inserted. These keys are used to access the properties of the corresponding curves and markers.

A QwtPlot widget can have up to four axes which are indexed by the constants QwtPlot::yLeft, QwtPlot::yRight, QwtPlot::xTop, and QwtPlot::xBottom. Curves, markers, and the grid must be attached to an x axis and a y axis (Default: yLeft and xBottom).

Example
The following example shows (schematically) the most simple way to use QwtPlot. By default, only the left and bottom axes are visible and their scales are computed automatically.
#include "../include/qwt_plot.h>

QwtPlot *myPlot;
long curve1, curve2;                    // keys
double x[100], y1[100], y2[100];        // x and y values

myPlot = new QwtPlot("Two Graphs", parent, name);

// add curves
curve1 = myPlot->insertCurve("Graph 1");
curve2 = myPlot->insertCurve("Graph 2");

getSomeValues(x, y1, y2);

// copy the data into the curves
myPlot->setCurveData(curve1, x, y1, 100);
myPlot->setCurveData(curve2, x, y2, 100);

// finally, refresh the plot
myPlot->replot();


Public Types

enum  Axis {
  yLeft,
  yRight,
  xBottom,
  xTop,
  axisCnt
}

Public Member Functions

 QwtPlot (QWidget *p=0, const char *name=0)
 QwtPlot (const QString &title, QWidget *p=0, const char *name=0)
virtual ~QwtPlot ()
void enableXBottomAxis (bool b)
bool xBottomAxisEnabled () const
void enableXTopAxis (bool b)
bool xTopAxisEnabled () const
void enableYRightAxis (bool b)
bool yRightAxisEnabled () const
void enableYLeftAxis (bool b)
bool yLeftAxisEnabled () const
void setAutoReplot (bool tf=TRUE)
bool autoReplot () const
void print (QPaintDevice &p, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const
virtual void print (QPainter *, const QRect &rect, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const
void clear ()
void enableOutline (bool tf)
bool outlineEnabled () const
void setOutlineStyle (Qwt::Shape os)
Qwt::Shape outlineStyle () const
void setOutlinePen (const QPen &pn)
const QPen & outlinePen () const
QwtPlotLayoutplotLayout ()
const QwtPlotLayoutplotLayout () const
void setMargin (int margin)
int margin () const
void setTitle (const QString &t)
QString title () const
void setTitleFont (const QFont &f)
QFont titleFont () const
QLabel * titleLabel ()
const QLabel * titleLabel () const
QwtPlotCanvascanvas ()
const QwtPlotCanvascanvas () const
void setCanvasBackground (const QColor &c)
const QColor & canvasBackground () const
void setCanvasLineWidth (int w)
int canvasLineWidth () const
QwtPlotCurveIterator curveIterator () const
QwtPlotMarkerIterator markerIterator () const
QwtDiMap canvasMap (int axis) const
double invTransform (int axis, int pos) const
int transform (int axis, double value) const
long insertCurve (QwtPlotCurve *)
long insertCurve (const QString &title, int xAxis=xBottom, int yAxis=yLeft)
QwtPlotCurvecurve (long key)
const QwtPlotCurvecurve (long key) const
bool removeCurve (long key)
void removeCurves ()
QwtArray< long > curveKeys () const
long closestCurve (int xpos, int ypos, int &dist) const
long closestCurve (int xpos, int ypos, int &dist, double &xval, double &yval, int &index) const
bool setCurveBaseline (long key, double ref)
double curveBaseline (long key) const
bool setCurveRawData (long key, const double *x, const double *y, int size)
bool setCurveData (long key, const double *x, const double *y, int size)
bool setCurveData (long key, const QwtArray< double > &x, const QwtArray< double > &y)
bool setCurveData (long key, const QwtArray< QwtDoublePoint > &data)
bool setCurveData (long key, const QwtData &data)
bool setCurveOptions (long key, int t)
int curveOptions (long key) const
bool setCurvePen (long key, const QPen &pen)
QPen curvePen (long key) const
bool setCurveBrush (long key, const QBrush &brush)
QBrush curveBrush (long key) const
bool setCurveSplineSize (long key, int s)
int curveSplineSize (long key) const
bool setCurveStyle (long key, int s, int options=0)
int curveStyle (long key) const
bool setCurveSymbol (long key, const QwtSymbol &s)
QwtSymbol curveSymbol (long key) const
bool setCurveTitle (long key, const QString &s)
QString curveTitle (long key) const
bool setCurveXAxis (long key, int axis)
int curveXAxis (long key) const
bool setCurveYAxis (long key, int axis)
int curveYAxis (long key) const
void drawCurve (long key, int from=0, int to=-1)
void enableGridX (bool tf=TRUE)
void enableGridXMin (bool tf=TRUE)
void enableGridY (bool tf=TRUE)
void enableGridYMin (bool tf=TRUE)
void setGridXAxis (int axis)
int gridXAxis () const
void setGridYAxis (int axis)
int gridYAxis () const
void setGridPen (const QPen &p)
void setGridMajPen (const QPen &p)
const QPen & gridMajPen () const
void setGridMinPen (const QPen &p)
const QPen & gridMinPen () const
QwtPlotGridgrid ()
const QwtPlotGridgrid () const
void setAxisAutoScale (int axis)
bool axisAutoScale (int axis) const
void enableAxis (int axis, bool tf=TRUE)
bool axisEnabled (int axis) const
void changeAxisOptions (int axis, int opt, bool value)
void setAxisOptions (int axis, int opt)
int axisOptions (int axis) const
void setAxisFont (int axis, const QFont &f)
QFont axisFont (int axis) const
void setAxisMargins (int axis, double mlo, double mhi)
bool axisMargins (int axis, double &mlo, double &mhi) const
void setAxisScale (int axis, double min, double max, double step=0)
void setAxisScaleDraw (int axis, QwtScaleDraw *)
const QwtScaleDivaxisScale (int axis) const
const QwtScaleDrawaxisScaleDraw (int axis) const
const QwtScaleaxis (int axis) const
void setAxisLabelFormat (int axis, char f, int prec, int fieldwidth=0)
void axisLabelFormat (int axis, char &f, int &prec, int &fieldwidth) const
void setAxisLabelAlignment (int axis, int alignment)
void setAxisLabelRotation (int axis, double rotation)
void setAxisTitle (int axis, const QString &t)
QString axisTitle (int axis) const
void setAxisTitleFont (int axis, const QFont &f)
QFont axisTitleFont (int axis) const
void setAxisTitleAlignment (int axis, int align)
int axisTitleAlignment (int axis) const
void setAxisMaxMinor (int axis, int maxMinor)
int axisMaxMajor (int axis) const
void setAxisMaxMajor (int axis, int maxMajor)
int axisMaxMinor (int axis) const
void setAxisReference (int axis, double value)
double axisReference (int axis) const
long insertMarker (QwtPlotMarker *)
long insertMarker (const QString &label=QString::null, int xAxis=xBottom, int yAxis=yLeft)
long insertLineMarker (const QString &label, int axis)
QwtPlotMarkermarker (long key)
const QwtPlotMarkermarker (long key) const
bool removeMarker (long key)
void removeMarkers ()
long closestMarker (int xpos, int ypos, int &dist) const
QwtArray< long > markerKeys () const
bool setMarkerXAxis (long key, int axis)
int markerXAxis (long key) const
bool setMarkerYAxis (long key, int axis)
int markerYAxis (long key) const
bool setMarkerPos (long key, double xval, double yVal)
bool setMarkerXPos (long key, double val)
bool setMarkerYPos (long key, double val)
void markerPos (long key, double &mx, double &my) const
bool setMarkerFont (long key, const QFont &f)
QFont markerFont (long key) const
bool setMarkerPen (long key, const QPen &p)
bool setMarkerLabel (long key, const QString &text, const QFont &font=QFont(), const QColor &color=QColor(), const QPen &pen=QPen(Qt::NoPen), const QBrush &brush=QBrush(Qt::NoBrush))
bool setMarkerLabelText (long key, const QString &text)
const QString markerLabel (long key) const
bool setMarkerLabelAlign (long key, int align)
int markerLabelAlign (long key) const
bool setMarkerLabelPen (long key, const QPen &p)
QPen markerLabelPen (long key) const
bool setMarkerLinePen (long key, const QPen &p)
QPen markerLinePen (long key) const
bool setMarkerLineStyle (long key, QwtMarker::LineStyle st)
QwtMarker::LineStyle markerLineStyle (long key) const
bool setMarkerSymbol (long key, const QwtSymbol &s)
QwtSymbol markerSymbol (long key) const
void setAutoLegend (bool enabled)
bool autoLegend () const
void enableLegend (bool tf, long curveKey=-1)
bool legendEnabled (long curveKey) const
void setLegendPos (int pos, double ratio=0.0)
int legendPos () const
void setLegendFont (const QFont &f)
const QFont legendFont () const
void setLegendFrameStyle (int st)
int legendFrameStyle () const
QwtLegendlegend ()
const QwtLegendlegend () const
void setLegendDisplayPolicy (QwtLegend::LegendDisplayPolicy, int mode=-1)
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
virtual QSizePolicy sizePolicy () const
virtual bool event (QEvent *)
virtual void replot ()

Protected Member Functions

virtual void lgdClicked ()
void plotMousePressed (const QMouseEvent &e)
void plotMouseReleased (const QMouseEvent &e)
void plotMouseMoved (const QMouseEvent &e)
void legendClicked (long key)
void autoRefresh ()
virtual void drawCanvas (QPainter *)
virtual void drawCanvasItems (QPainter *, const QRect &, const QwtArray< QwtDiMap > &, const QwtPlotPrintFilter &) const
virtual void drawContents (QPainter *p)
virtual void updateTabOrder ()
void updateAxes ()
void updateLayout ()
virtual void resizeEvent (QResizeEvent *e)
virtual void insertLegendItem (long curveKey)
virtual void updateLegendItem (long curveKey)
virtual void printLegendItem (QPainter *, const QWidget *, const QRect &) const
void updateLegendItem (const QwtPlotCurve *, QwtLegendItem *)
virtual void printTitle (QPainter *, const QRect &) const
virtual void printScale (QPainter *, int axis, int startDist, int endDist, int baseDist, const QRect &) const
virtual void printCanvas (QPainter *, const QRect &, const QwtArray< QwtDiMap > &, const QwtPlotPrintFilter &) const
virtual void printLegend (QPainter *, const QRect &) const

Static Protected Member Functions

bool axisValid (int axis)

Friends

class QwtPlotItem
class QwtPlotCanvas
class QwtPlotPrintFilter


Member Enumeration Documentation

enum QwtPlot::Axis
 

Axis index.


Constructor & Destructor Documentation

QwtPlot::QwtPlot QWidget *  parent = 0,
const char *  name = 0
 

Constructor.

Parameters:
parent Parent widget
name Widget name

QwtPlot::QwtPlot const QString &  title,
QWidget *  parent = 0,
const char *  name = 0
 

Constructor.

Parameters:
title Title text
parent Parent widget
name Widget name

QwtPlot::~QwtPlot  )  [virtual]
 

Destructor.


Member Function Documentation

bool QwtPlot::autoLegend  )  const
 

Returns:
TRUE if the autoLegend option is set.

void QwtPlot::autoRefresh  )  [protected]
 

Replots the plot if QwtPlot::autoReplot() is TRUE.

bool QwtPlot::autoReplot  )  const
 

Returns:
TRUE if the autoReplot option is set.

const QwtScale * QwtPlot::axis int  axis  )  const
 

Returns:
specified axis, or NULL if the axis is not enabled.
Parameters:
axis axis index

bool QwtPlot::axisAutoScale int  axis  )  const
 

Returns:
TRUE if autoscaling is enabled
Parameters:
axis axis index

bool QwtPlot::axisEnabled int  axis  )  const
 

Returns:
TRUE if a specified axis is enabled
Parameters:
axis axis index

QFont QwtPlot::axisFont int  axis  )  const
 

Returns:
the font of the scale labels for a specified axis
Parameters:
axis axis index

void QwtPlot::axisLabelFormat int  axis,
char &  f,
int &  prec,
int &  fieldwidth
const
 

Returns:
the number format for the major scale labels of a specified axis
Parameters:
axis axis index
Return values:
f format character
prec precision
fieldwidth minimum fieldwidth
See also:
QString::sprintf in the Qt manual

bool QwtPlot::axisMargins int  axis,
double &  mlo,
double &  mhi
const
 

Determine the scale margins for a specified axis.

Parameters:
axis axis index
Return values:
mlo Margin at the lower limit
mhi Margin at the upper limit
See also:
QwtAutoScale::margins()

int QwtPlot::axisMaxMajor int  axis  )  const
 

Returns:
the maximum number of major ticks for a specified axis
Parameters:
axis axis index

int QwtPlot::axisMaxMinor int  axis  )  const
 

Returns:
the maximum number of minor ticks for a specified axis
Parameters:
axis axis index

int QwtPlot::axisOptions int  axis  )  const
 

Returns:
the autoscaling options of a specified axis
Parameters:
axis axis index
See also:
QwtAutoScale::options

double QwtPlot::axisReference int  axis  )  const
 

The reference value is needed if the autoscaling options QwtAutoScale::Symmetric or QwtAutoScale::IncludeRef are set.

Returns:
the reference value of an axis
Parameters:
axis axis index
See also:
QwtAutoScale, QwtPlot::setAxisOptions

const QwtScaleDiv * QwtPlot::axisScale int  axis  )  const
 

Returns:
the scale division of a specified axis
Parameters:
axis axis index
See also:
QwtScaleDiv

const QwtScaleDraw * QwtPlot::axisScaleDraw int  axis  )  const
 

Returns:
the scale draw of a specified axis
Parameters:
axis axis index
Returns:
specified scaleDraw for axis, or NULL if axis is invalid.
See also:
QwtScaleDraw

QString QwtPlot::axisTitle int  axis  )  const
 

Returns:
the title of a specified axis
Parameters:
axis axis index

int QwtPlot::axisTitleAlignment int  axis  )  const
 

Returns:
the title alignment of a specified axis
Parameters:
axis axis index
See also:
QwtPlot::setAxisTitleAlignment

QFont QwtPlot::axisTitleFont int  axis  )  const
 

Returns:
the title font of a specified axis
Parameters:
axis axis index

bool QwtPlot::axisValid int  axis  )  [static, protected]
 

Returns:
TRUE if the specified axis exists, otherwise FALSE
Parameters:
axis axis index

const QwtPlotCanvas * QwtPlot::canvas  )  const
 

Returns:
the plot's canvas

QwtPlotCanvas * QwtPlot::canvas  ) 
 

Returns:
the plot's canvas

const QColor & QwtPlot::canvasBackground  )  const
 

Nothing else than: canvas()->palette().color( QPalette::Normal, QColorGroup::Background);

Returns:
the background color of the plotting area.

int QwtPlot::canvasLineWidth  )  const
 

Nothing else than: canvas()->lineWidth(), left for compatibility only.

Returns:
the border width of the plotting area

QwtDiMap QwtPlot::canvasMap int  axis  )  const
 

Parameters:
axis Axis
Returns:
Map for the axis on the canvas. With this map pixel coordinates can translated to plot coordinates and vice versa.
See also:
QwtDiMap, QwtPlot::transform, QwtPlot::invTransform

void QwtPlot::changeAxisOptions int  axis,
int  opt,
bool  value
 

Change specified autoscaling options of an axis.

Parameters:
axis axis index
opt Set of or'ed options
value Value to be assigned to all the specified options (TRUE or FALSE)
See also:
QwtAutoScale::changeOptions

void QwtPlot::clear  ) 
 

Remove all curves and markers.

long QwtPlot::closestCurve int  xpos,
int  ypos,
int &  dist,
double &  xval,
double &  yval,
int &  index
const
 

Find the curve which is closest to a point in the plotting area.

Determines the position and index of the closest data point.

Parameters:
xpos 
ypos coordinates of a point in the plotting region
Return values:
xval 
yval values of the closest point in the curve's data array
dist -- distance in points between (xpos, ypos) and the closest data point
index -- index of the closest point in the curve's data array
Returns:
Key of the closest curve or 0 if no curve was found.

long QwtPlot::closestCurve int  xpos,
int  ypos,
int &  dist
const
 

Find the curve which is closest to a specified point in the plotting area.

Parameters:
xpos 
ypos position in the plotting region
Return values:
dist distance in points between (xpos, ypos) and the closest data point
Returns:
Key of the closest curve or 0 if no curve was found.

long QwtPlot::closestMarker int  xpos,
int  ypos,
int &  dist
const
 

Find the marker which is closest to a given point.

Parameters:
xpos 
ypos coordinates of a point in the plotting region
Return values:
dist Distance in points between the marker and the specified point.
Returns:
Key of the closest marker or 0 if no marker was found

const QwtPlotCurve * QwtPlot::curve long  key  )  const
 

Find and return an existing curve.

Parameters:
key Key of the curve
Returns:
The curve for the given key or 0 if key is not valid.

QwtPlotCurve * QwtPlot::curve long  key  ) 
 

Find and return an existing curve.

Parameters:
key Key of the curve
Returns:
The curve for the given key or 0 if key is not valid.

double QwtPlot::curveBaseline long  key  )  const
 

Return the baseline offset for a specified curve.

Parameters:
key curve key
Returns:
Baseline offset of the specified curve, or 0 if the curve doesn't exist
See also:
setCurveBaseline()

QBrush QwtPlot::curveBrush long  key  )  const
 

Returns:
the pen of the curve indexed by key
Parameters:
key Key of the curve
See also:
QwtPlot::setCurveBrush(), QwtCurve::setBrush()

QwtPlotCurveIterator QwtPlot::curveIterator  )  const
 

Return an iterator for the plot curves.

QwtArray< long > QwtPlot::curveKeys  )  const
 

Returns:
an array containing the keys of all curves

int QwtPlot::curveOptions long  key  )  const
 

Returns:
the drawing options of the curve indexed by key
Parameters:
key Key of the curve

QPen QwtPlot::curvePen long  key  )  const
 

Returns:
the brush of the curve indexed by key
Parameters:
key Key of the curve

int QwtPlot::curveSplineSize long  key  )  const
 

Returns:
the spline size of the curve indexed by key
Parameters:
key Key of the curve

int QwtPlot::curveStyle long  key  )  const
 

Returns:
the style of the curve indexed by key
Parameters:
key Key of the curve
See also:
setCurveStyle()

QwtSymbol QwtPlot::curveSymbol long  key  )  const
 

the symbol of the curve indexed by key

Parameters:
key Key of the curve
Returns:
The symbol of the specified curve. If the key is invalid, a symbol of type 'NoSymbol'.

QString QwtPlot::curveTitle long  key  )  const
 

Returns:
the title of the curve indexed by key
Parameters:
key Key of the curve

int QwtPlot::curveXAxis long  key  )  const
 

Return the index of the x axis to which a curve is mapped.

Parameters:
key Key of the curve
Returns:
x axis of the curve or -1 if the key is invalid.

int QwtPlot::curveYAxis long  key  )  const
 

the index of the y axis to which a curve is mapped

Parameters:
key Key of the curve
Returns:
y axis of the curve or -1 if the key is invalid.

void QwtPlot::drawCanvas QPainter *  painter  )  [protected, virtual]
 

Redraw the canvas.

Parameters:
painter Painter used for drawing
Warning:
drawCanvas calls drawCanvasItems what is also used for printing. Applications that like to add individual plot items better overload QwtPlot::drawCanvasItems
See also:
QwtPlot::drawCanvasItems

void QwtPlot::drawCanvasItems QPainter *  painter,
const QRect &  rect,
const QwtArray< QwtDiMap > &  map,
const QwtPlotPrintFilter pfilter
const [protected, virtual]
 

Redraw the canvas items.

Parameters:
painter Painter used for drawing
rect Bounding rectangle where to paint
map QwtPlot::axisCnt maps, mapping between plot and paint device coordinates
pfilter Plot print filter

void QwtPlot::drawContents QPainter *  p  )  [protected, virtual]
 

drawContents

void QwtPlot::drawCurve long  key,
int  from = 0,
int  to = -1
 

Draw a set of points of a curve. When observing an measurement while it is running, new points have to be added to an existing curve. drawCurve can be used to display them avoiding a complete redraw of the canvas.

Parameters:
key curve key
from index of the first point to be painted
to index of the last point to be painted. If to < 0 the curve will be painted to its last point.
See also:
QwtCurve::draw

void QwtPlot::enableAxis int  axis,
bool  tf = TRUE
 

Enable or disable a specified axis.

When an axis is disabled, this only means that it is not visible on the screen. Curves, markers and can be attached to disabled axes, and transformation of screen coordinates into values works as normal.

Only xBottom and yLeft are enabled by default.

Parameters:
axis axis index
tf TRUE (enabled) or FALSE (disabled)

void QwtPlot::enableGridX bool  tf = TRUE  ) 
 

Enable or disable vertical gridlines.

Parameters:
tf Enable (TRUE) or disable (FALSE). Defaults to TRUE.

void QwtPlot::enableGridXMin bool  tf = TRUE  ) 
 

Enable or disable vertical gridlines for the minor scale marks.

Parameters:
tf enable (TRUE) or disable (FALSE). Defaults to TRUE.

void QwtPlot::enableGridY bool  tf = TRUE  ) 
 

Enable or disable horizontal gridlines.

Parameters:
tf Enable (TRUE) or disable (FALSE). Defaults to TRUE.

void QwtPlot::enableGridYMin bool  tf = TRUE  ) 
 

Enable or disable horizontal gridlines for the minor scale marks.

Parameters:
tf enable (TRUE) or disable (FALSE). Defaults to TRUE.

void QwtPlot::enableLegend bool  enable,
long  curveKey = -1
 

Enable or disable the legend.

Parameters:
enable TRUE (enabled) or FALSE (disabled)
curveKey Key of a existing curve. If curveKey < 0 the legends for all curves will be updated.
See also:
QwtPlot::setAutoLegend()

QwtPlot::setLegendPos()

void QwtPlot::enableOutline bool  tf  ) 
 

Enables or disables outline drawing. When the outline feature is enabled, a shape will be drawn in the plotting region when the user presses or drags the mouse. It can be used to implement crosshairs, mark a selected region, etc.

Parameters:
tf TRUE (enabled) or FALSE (disabled)
Warning:
An outline style has to be specified.
See also:
setOutlineStyle()

bool QwtPlot::event QEvent *  e  )  [virtual]
 

Adds handling of QEvent::LayoutHint.

const QwtPlotGrid & QwtPlot::grid  )  const
 

Return the canvas grid.

QwtPlotGrid & QwtPlot::grid  ) 
 

Return the canvas grid.

const QPen & QwtPlot::gridMajPen  )  const
 

Returns:
pen of the major grid
See also:
QwtPlot::setGridMajPen, QwtPlot::gridMinPen

const QPen & QwtPlot::gridMinPen  )  const
 

Returns:
pen of the minor grid
See also:
QwtPlot::setGridMinPen, QwtPlot::gridMajPen

int QwtPlot::gridXAxis  )  const
 

Returns:
x-axis where the grid is attached to.
See also:
QwtPlot::setGridXAxis

int QwtPlot::gridYAxis  )  const
 

Returns:
y-axis where the grid is attached to.
See also:
QwtPlot::setGridYAxis

long QwtPlot::insertCurve const QString &  title,
int  xAxis = xBottom,
int  yAxis = yLeft
 

Insert a new curve and return a unique key.

Parameters:
title title of the new curve
xAxis x axis to be attached. Defaults to xBottom.
yAxis y axis to be attached. Defaults to yLeft.
Returns:
The key of the new curve or 0 if no new key could be found or if no new curve could be allocated.

long QwtPlot::insertCurve QwtPlotCurve curve  ) 
 

Insert a curve.

Parameters:
curve Curve
Returns:
The key of the new curve or 0 if no new key could be found or if no new curve could be allocated.

void QwtPlot::insertLegendItem long  curveKey  )  [protected, virtual]
 

Insert a QwtLegendItem for a specified curve.

In case of legend()->isReadOnly the item will be a QwtLegendLabel, otherwise a QwtLegendButton.

Parameters:
curveKey curve key
See also:
QwtLegendButton, QwtLegendItem, QwtLegend, updateLegendItem(), printLegendItem()

long QwtPlot::insertLineMarker const QString &  label,
int  axis
 

This function is a shortcut to insert a horizontal or vertical line marker, dependent on the specified axis.

Parameters:
label Label
axis Axis to be attached
Returns:
New key if the marker could be inserted, 0 if not.

long QwtPlot::insertMarker const QString &  label = QString::null,
int  xAxis = xBottom,
int  yAxis = yLeft
 

Insert a new marker.

Parameters:
label Label
xAxis X axis to be attached
yAxis Y axis to be attached
Returns:
New key if the marker could be inserted, 0 if not.

long QwtPlot::insertMarker QwtPlotMarker marker  ) 
 

Insert a new marker.

Parameters:
marker Marker
Returns:
New key if the marker could be inserted, 0 if not.

double QwtPlot::invTransform int  axis,
int  pos
const
 

Transform the x or y coordinate of a position in the drawing region into a value.

Parameters:
axis axis index
pos position
Warning:
The position can be an x or a y coordinate, depending on the specified axis.

const QwtLegend * QwtPlot::legend  )  const
 

Returns:
the plot's legend
See also:
insertLegendItem(), updateLegendItem(), printLegendItem()

QwtLegend * QwtPlot::legend  ) 
 

Returns:
the plot's legend
See also:
insertLegendItem(), updateLegendItem(), printLegendItem()

void QwtPlot::legendClicked long  key  )  [protected]
 

A signal which is emitted when legend()->isReadOnly() and the user has clicked on a legend item,

Parameters:
key Key of the curve corresponding to the selected legend item
Note:
To enable clicks legend()->setReadOnly(TRUE) has to be set before the items have been inserted.
See also:
QwtLegend::setReadOnly, QwtLegend::isReadOnly

bool QwtPlot::legendEnabled long  curveKey  )  const
 

Parameters:
curveKey Curve key.
Returns:
TRUE if legend is enabled, otherwise FALSE

const QFont QwtPlot::legendFont  )  const
 

Returns:
the font of the legend items

int QwtPlot::legendFrameStyle  )  const
 

Returns:
the frame style of the legend

int QwtPlot::legendPos  )  const
 

Returns:
position of the legend
See also:
QwtPlot::setLegendPos, QwtPlotLayout::legendPos()

void QwtPlot::lgdClicked  )  [protected, virtual]
 

Called internally when the legend has been clicked on. Emits a legendClicked() signal.

int QwtPlot::margin  )  const
 

Returns:
margin
See also:
QwtPlot::setMargin(), QwtPlotLayout::margin(), QwtPlot::plotLayout()

const QwtPlotMarker * QwtPlot::marker long  key  )  const
 

Find and return an existing marker.

Parameters:
key Key of the marker
Returns:
The marker for the given key or 0 if key is not valid.

QwtPlotMarker * QwtPlot::marker long  key  ) 
 

Find and return an existing marker.

Parameters:
key Key of the marker
Returns:
The marker for the given key or 0 if key is not valid.

QFont QwtPlot::markerFont long  key  )  const
 

Returns:
the font of a marker

QwtPlotMarkerIterator QwtPlot::markerIterator  )  const
 

Return an iterator for the plot curves.

QwtArray< long > QwtPlot::markerKeys  )  const
 

Returns:
an array containing the keys of all markers

const QString QwtPlot::markerLabel long  key  )  const
 

Returns:
a marker's label
Parameters:
key Marker key

int QwtPlot::markerLabelAlign long  key  )  const
 

Returns:
a marker's label alignment
Parameters:
key Marker key

QPen QwtPlot::markerLabelPen long  key  )  const
 

Returns:
the pen of a marker's label
Parameters:
key Marker key

QPen QwtPlot::markerLinePen long  key  )  const
 

Returns:
a marker's line pen
Parameters:
key Marker key

QwtMarker::LineStyle QwtPlot::markerLineStyle long  key  )  const
 

Returns:
a marker's line style
Parameters:
key Marker key

void QwtPlot::markerPos long  key,
double &  mx,
double &  my
const
 

Get the position of a marker.

Parameters:
key Marker key
Return values:
mx 
my Marker position

QwtSymbol QwtPlot::markerSymbol long  key  )  const
 

Returns:
a marker's symbol
Parameters:
key Marker key

int QwtPlot::markerXAxis long  key  )  const
 

Returns:
the x axis to which a marker is attached
Parameters:
key Marker key

int QwtPlot::markerYAxis long  key  )  const
 

Returns:
the y axis to which a marker is attached
Parameters:
key Marker key

QSize QwtPlot::minimumSizeHint  )  const [virtual]
 

Return a minimum size hint.

bool QwtPlot::outlineEnabled  )  const
 

Returns:
TRUE if the outline feature is enabled

const QPen & QwtPlot::outlinePen  )  const
 

Returns:
the pen used to draw outlines

Qwt::Shape QwtPlot::outlineStyle  )  const
 

Returns:
the outline style
See also:
setOutlineStyle()

const QwtPlotLayout * QwtPlot::plotLayout  )  const
 

Returns:
the plot's layout

QwtPlotLayout * QwtPlot::plotLayout  ) 
 

Returns:
the plot's layout

void QwtPlot::plotMouseMoved const QMouseEvent &  e  )  [protected]
 

A signal which is emitted when the mouse is moved in the plot canvas. The coordinates are pixel values referring to the plot canvas. They can be translated using the canvasMaps.

Parameters:
e Mouse event object
See also:
QwtPlot::canvasMap()

void QwtPlot::plotMousePressed const QMouseEvent &  e  )  [protected]
 

A signal which is emitted when the mouse is pressed in the plot canvas. The coordinates are pixel values referring to the plot canvas. They can be translated using the canvasMaps.

Parameters:
e Mouse event object
See also:
QwtPlot::canvasMap()

void QwtPlot::plotMouseReleased const QMouseEvent &  e  )  [protected]
 

A signal which is emitted when a mouse button has been released in the plot canvas. The coordinates are pixel values referring to the plot canvas. They can be translated using the canvasMaps.

Parameters:
e Mouse event object, event coordinates referring to the plot canvas
See also:
QwtPlot::canvasMap()

void QwtPlot::print QPainter *  painter,
const QRect &  plotRect,
const QwtPlotPrintFilter pfilter = QwtPlotPrintFilter()
const [virtual]
 

Paint the plot into a given rectangle. Paint the contents of a QwtPlot instance into a given rectangle.

Parameters:
painter Painter
plotRect Bounding rectangle
pfilter Print filter
See also:
QwtPlotPrintFilter

void QwtPlot::print QPaintDevice &  paintDev,
const QwtPlotPrintFilter pfilter = QwtPlotPrintFilter()
const
 

Print the plot to a QPaintDevice (QPrinter) This function prints the contents of a QwtPlot instance to QPaintDevice object. The size is derived from its device metrics.

Parameters:
paintDev device to paint on, often a printer
pfilter print filter
See also:
QwtPlot::print

QwtPlotPrintFilter

Warning:
Printing on a QPrinter(QPrinter::HighResolution) printer may expose a nasty bug in Qt. The problem concerns scaling of fonts: a given font should use 8 times more pixels on a 600 dpi paint device than on a 75 dpi paint device.
High resolution print tests on a Mandrake-8.2 system with a 75 dpi screen show (test program available on request):
  • Qt finds more fonts with the X Font Server enabled than disabled (use qtconfig). On the test system this has no consequences for the print quality.
  • Qt-3.0.7 finds significantly more fonts than its successors and printing works fine.
  • Qt-3.1.2 finds less fonts than Qt-3.0.7 with the X Font Server enabled and printing fine.
  • Qt-3.2.0 finds less fonts than Qt-3.0.7 and printing only works for rich text. All plain text is printed at 75 dpi instead of 600 dpi. Some standard X Window fonts as "Helvetica [Adobe]" do not print well as rich text.
  • Qt-3.2.1 finds a few more fonts than Qt-3.2.0 and some standard non-scalable X Window fonts as "Helvetica [Adobe]" do not print well as rich and plain text.
  • Qt-3.2.2 still has problems with the same fonts as Qt-3.2.1, but there is improvement (text printed with non-scalable X Windows fonts is barely readable and looks ugly, because Qt gets the font metrics wrong).

Recommendations:

  • Do not use Qt-3.2.0.
  • Do not use non-scalable fonts for printing, especially if you print to postscript files that are to be included in other documents.

We will continue to report the bug.

void QwtPlot::printCanvas QPainter *  painter,
const QRect &  canvasRect,
const QwtArray< QwtDiMap > &  map,
const QwtPlotPrintFilter pfilter
const [protected, virtual]
 

Print the canvas into a given rectangle.

Parameters:
painter Painter
map Maps mapping between plot and paint device coordinates
canvasRect Bounding rectangle
pfilter Print filter
See also:
QwtPlotPrintFilter

void QwtPlot::printLegend QPainter *  painter,
const QRect &  rect
const [protected, virtual]
 

Print the legend into a given rectangle.

Parameters:
painter Painter
rect Bounding rectangle

void QwtPlot::printScale QPainter *  painter,
int  axis,
int  startDist,
int  endDist,
int  baseDist,
const QRect &  rect
const [protected, virtual]
 

Paint a scale into a given rectangle. Paint the scale into a given rectangle.

Parameters:
painter Painter
axis Axis
startDist Start border distance
endDist End border distance
baseDist Base distance
rect Bounding rectangle

void QwtPlot::printTitle QPainter *  painter,
const QRect &  rect
const [protected, virtual]
 

Print the title into a given rectangle.

Parameters:
painter Painter
rect Bounding rectangle

bool QwtPlot::removeCurve long  key  ) 
 

remove the curve indexed by key

Parameters:
key Key of the curve

void QwtPlot::removeCurves  ) 
 

Remove all curves.

bool QwtPlot::removeMarker long  key  ) 
 

Remove the marker indexed by key.

Parameters:
key unique key

void QwtPlot::removeMarkers  ) 
 

Remove all markers.

void QwtPlot::replot  )  [virtual]
 

Redraw the plot If the autoReplot option is not set (which is the default) or if any curves are attached to raw data, the plot has to be refreshed explicitly in order to make changes visible.

See also:
setAutoReplot()

void QwtPlot::resizeEvent QResizeEvent *  e  )  [protected, virtual]
 

Resize and update internal layout.

void QwtPlot::setAutoLegend bool  tf  ) 
 

Set or reset the autoLegend option If the autoLegend option is set, a item will be added to the legend whenever a curve is inserted.

The autoLegend option is set to FALSE by default, which means that the user has to call enableLegend.

Parameters:
tf TRUE or FALSE. Defaults to FALSE.
See also:
QwtPlot::enableLegend()

void QwtPlot::setAutoReplot bool  tf = TRUE  ) 
 

Set or reset the autoReplot option If the autoReplot option is set, the plot will be updated implicitly by manipulating member functions. Since this may be time-consuming, it is recommended to leave this option switched off and call replot() explicitly if necessary.

The autoReplot option is set to FALSE by default, which means that the user has to call replot() in order to make changes visible.

Parameters:
tf TRUE or FALSE. Defaults to TRUE.
See also:
replot()

void QwtPlot::setAxisAutoScale int  axis  ) 
 

Enable autoscaling for a specified axis.

This member function is used to switch back to autoscaling mode after a fixed scale has been set. Autoscaling is enabled by default.

Parameters:
axis axis index
See also:
QwtPlot::setAxisScale()

void QwtPlot::setAxisFont int  axis,
const QFont &  f
 

Change the font of an axis.

Parameters:
axis axis index
f font
Warning:
This function changes the font of the tick labels, not of the axis title.

void QwtPlot::setAxisLabelFormat int  axis,
char  f,
int  prec,
int  fieldwidth = 0
 

Change the number format for the major scale of a selected axis.

Parameters:
axis axis index
f format
prec precision
fieldwidth minimum fieldwidth
See also:
QString::sprintf in the Qt manual

void QwtPlot::setAxisMargins int  axis,
double  mlo,
double  mhi
 

Assign margins to a specified axis.

Parameters:
axis axis index
mlo margin at the lower end of the scale
mhi margin at the upper end of the scale
Warning:
If the scale is logarithmic, the margins are measured in decades
See also:
QwtAutoScale::setMargins

void QwtPlot::setAxisMaxMajor int  axis,
int  maxMajor
 

Set the maximum number of major scale intervals for a specified axis.

Parameters:
axis axis index
maxMajor maximum number of major steps
See also:
QwtAutoScale::setMaxMajor

void QwtPlot::setAxisMaxMinor int  axis,
int  maxMinor
 

Set the maximum number of minor scale intervals for a specified axis.

Parameters:
axis axis index
maxMinor maximum number of minor steps
See also:
QwtAutoScale::setMaxMinor

void QwtPlot::setAxisOptions int  axis,
int  opt
 

Reset scale options and set specified options for a specified axis.

Parameters:
axis axis index
opt set of options
See also:
QwtAutoScale::setOptions

void QwtPlot::setAxisReference int  axis,
double  value
 

Set a reference value for a specified axis.

The reference value is used by some autoscaling modes.

Parameters:
axis axis index
value reference value
See also:
QwtAutoScale::setReference, QwtPlot::setAxisOptions()

void QwtPlot::setAxisScale int  axis,
double  min,
double  max,
double  step = 0
 

Disable autoscaling and specify a fixed scale for a selected axis.

Parameters:
axis axis index
min 
max minimum and maximum of the scale
step Major step size. If step == 0, the step size is calculated automatically using the maxMajor setting.
See also:
QwtPlot::setAxisMaxMajor()

void QwtPlot::setAxisScaleDraw int  axis,
QwtScaleDraw scaleDraw
 

Set a scale draw.

Parameters:
axis axis index
scaleDraw object responsible for drawing scales.
By passing scaleDraw it is possible to extend QwtScaleDraw functionality and let it take place in QwtPlot. Please note that scaleDraw has to be created with new and will be deleted by the corresponding QwtScale member ( like a child object ).

See also:
QwtScaleDraw, QwtScale
Warning:
The attributes of scaleDraw will be overwritten by those of the previous QwtScaleDraw.

void QwtPlot::setAxisTitle int  axis,
const QString &  t
 

Change the title of a specified axis.

Parameters:
axis axis index
t axis title

void QwtPlot::setAxisTitleAlignment int  axis,
int  align
 

Change the title alignment of a selected axis.

Parameters:
axis axis index
align or'd Qt::Alignment flags.
See also:
QwtScale::setTitleAlignment

void QwtPlot::setAxisTitleFont int  axis,
const QFont &  f
 

Change the title font of a selected axis.

Parameters:
axis axis index
f font

void QwtPlot::setCanvasBackground const QColor &  c  ) 
 

Change the background of the plotting area.

Sets c to QColorGroup::Background of all colorgroups of the palette of the canvas. Using canvas()->setPalette() is a more powerful way to set these colors.

Parameters:
c new background color

void QwtPlot::setCanvasLineWidth int  w  ) 
 

Change the border width of the plotting area Nothing else than canvas()->setLineWidth(w), left for compatibility only.

Parameters:
w new border width

bool QwtPlot::setCurveBaseline long  key,
double  ref
 

Set the baseline for a specified curve.

The baseline is needed for the curve style QwtCurve::Sticks,

Parameters:
key curve key
ref baseline offset from zero
See also:
QwtCurve::setBaseline

bool QwtPlot::setCurveBrush long  key,
const QBrush &  brush
 

Assign a brush to a curve indexed by key The brush will be used to fill the area between the curve and the baseline.

Parameters:
key Key of the curve
brush new brush
Returns:
TRUE if the curve exists
See also:
QwtCurve::setBrush for further details.

QwtPlot::brush(), QwtPlot::setCurveBaseline

bool QwtPlot::setCurveData long  key,
const QwtData data
 

Initialize curve data with any QwtData object.

Parameters:
key curve key
data Data
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveData long  key,
const QwtArray< QwtDoublePoint > &  data
 

Initialize curve data with a array of points (explicitly shared).

Parameters:
key curve key
data Data
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveData long  key,
const QwtArray< double > &  xData,
const QwtArray< double > &  yData
 

Initialize curve data with x- and y-arrays (data is explicitly shared).

Parameters:
key curve key
xData array with x-values
yData array with y-values
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveData long  key,
const double *  xData,
const double *  yData,
int  size
 

Set curve data by copying x- and y-values from specified blocks. Contrary to QwtPlot::setCurveRawData, this function makes a 'deep copy' of the data.

Parameters:
key curve key
xData pointer to x values
yData pointer to y values
size size of xData and yData
Returns:
TRUE if the curve exists
See also:
setCurveRawData(), QwtCurve::setData

bool QwtPlot::setCurveOptions long  key,
int  opt
 

Set the style options of a curve indexed by key.

Parameters:
key The curve's key
opt curve options
Returns:
TRUE if the specified curve exists.
See also:
QwtCurve::setOptions for a detailed description of valid options.

bool QwtPlot::setCurvePen long  key,
const QPen &  pen
 

Assign a pen to a curve indexed by key.

Parameters:
key Key of the curve
pen new pen
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveRawData long  key,
const double *  xData,
const double *  yData,
int  size
 

Initialize the curve data by pointing to memory blocks which are not managed by QwtPlot.

Parameters:
key Key of the curve
xData pointer to x data
yData pointer to y data
size size of x and y
Returns:
TRUE if the curve exists
Warning:
setRawData is provided for efficiency. The programmer should not delete the data during the lifetime of the underlying QwtCPointerData class.
See also:
QwtPlot::setCurveData(), QwtCurve::setRawData

bool QwtPlot::setCurveSplineSize long  key,
int  s
 

Set the number of interpolated points of a curve indexed by key.

Parameters:
key key of the curve
s size of the spline
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveStyle long  key,
int  s,
int  options = 0
 

Change a curve's style.

Parameters:
key Key of the curve
s display style of the curve
options style options
Returns:
TRUE if the curve exists
See also:
QwtCurve::setStyle() for a detailed description of valid styles.

bool QwtPlot::setCurveSymbol long  key,
const QwtSymbol s
 

Assign a symbol to a curve indexed by key.

Parameters:
key Key of the curve
s 
Returns:
TRUE if the curve exists

bool QwtPlot::setCurveTitle long  key,
const QString &  s
 

Parameters:
key 
s 
:

bool QwtPlot::setCurveXAxis long  key,
int  axis
 

Attach a curve to an x axis.

Parameters:
key key of the curve
axis x axis to be attached

bool QwtPlot::setCurveYAxis long  key,
int  axis
 

Attach a curve to an y axis.

Parameters:
key key of the curve
axis y axis to be attached

void QwtPlot::setGridMajPen const QPen &  p  ) 
 

Change the pen for the major gridlines.

Parameters:
p new pen

void QwtPlot::setGridMinPen const QPen &  p  ) 
 

Change the pen for the minor gridlines.

Parameters:
p new pen

void QwtPlot::setGridPen const QPen &  p  ) 
 

Change the grid's pens for major and minor gridlines.

Parameters:
p new pen

void QwtPlot::setGridXAxis int  axis  ) 
 

Attach the grid to an x axis.

Parameters:
axis x axis to be attached

void QwtPlot::setGridYAxis int  axis  ) 
 

Attach the grid to an y axis.

Parameters:
axis y axis to be attached

void QwtPlot::setLegendDisplayPolicy QwtLegend::LegendDisplayPolicy  policy,
int  mode = -1
 

Set the identifier display policy of the legend.

Parameters:
policy new policy.
mode new mode.
See also:
QwtLegend::setDisplayPolicy, QwtLegend::LegendDisplayPolicy

void QwtPlot::setLegendFont const QFont &  f  ) 
 

Change the font of the legend items.

Parameters:
f new font

void QwtPlot::setLegendFrameStyle int  st  ) 
 

Change the legend's frame style.

Parameters:
st Frame Style. See Qt manual on QFrame.

void QwtPlot::setLegendPos int  pos,
double  ratio = 0.0
 

Specify the position of the legend within the widget. If the position legend is Qwt::Left or Qwt::Right the legend will be organized in one column from top to down. Otherwise the legend items will be placed be placed in a table with a best fit number of columns from left to right.

Parameters:
pos The legend's position. Valid values are Qwt::Left, Qwt::Right, Qwt::Top, QwtBottom.
ratio Ratio between legend and the bounding rect of title, canvas and axes. The legend will be shrinked if it would need more space than the given ratio. The ratio is limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The default vertical/horizontal ratio is 0.33/0.5.
See also:
QwtPlot::legendPos(), QwtPlotLayout::setLegendPos()

void QwtPlot::setMargin int  margin  ) 
 

Change the margin of the plot. The margin is the space around all components.

Parameters:
margin new margin
See also:
QwtPlotLayout::setMargin(), QwtPlot::margin(), QwtPlot::plotLayout()

bool QwtPlot::setMarkerFont long  key,
const QFont &  f
 

Specify a font for a marker's label.

Parameters:
key Marker key
f New font
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLabel long  key,
const QString &  text,
const QFont &  font = QFont(),
const QColor &  color = QColor(),
const QPen &  pen = QPen(Qt::NoPen),
const QBrush &  brush = QBrush(Qt::NoBrush)
 

Set the marker label.

Parameters:
key Marker key
text the label text
font the font of the label text
color the color of the label text
pen the pen of the bounding box of the label text
brush the brush of the bounding box of the label text
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLabelAlign long  key,
int  align
 

Specify the alignment of a marker's label.

The alignment determines the position of the label relative to the marker's position. The default setting is AlignCenter.

Parameters:
key Marker key
align Alignment: AlignLeft, AlignRight, AlignTop, AlignBottom, AlignHCenter, AlignVCenter, AlignCenter or a combination of them.
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLabelPen long  key,
const QPen &  p
 

Specify a pen for a marker's label.

Parameters:
key Marker key
p Label pen
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLabelText long  key,
const QString &  text
 

Assign a text to the label of a marker.

Parameters:
key Marker key
text Label text
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLinePen long  key,
const QPen &  p
 

Specify a pen for a marker's line.

Parameters:
key Marker key
p New pen
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerLineStyle long  key,
QwtMarker::LineStyle  st
 

Specify the line style for a marker.

Parameters:
key Marker key
st Line style: QwtMarker::HLine, QwtMarker::VLine, QwtMarker::NoLine or a combination of them.
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerPen long  key,
const QPen &  p
 

Specify a pen for a marker's label.

Parameters:
key Marker key
p New pen
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerPos long  key,
double  xval,
double  yval
 

Change the position of a marker.

Parameters:
key Marker key
xval 
yval Position of the marker in axis coordinates.
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerSymbol long  key,
const QwtSymbol s
 

Assign a symbol to a specified marker.

Parameters:
key Marker key
s new symbol
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerXAxis long  key,
int  axis
 

Attach the marker to an x axis.

Returns:
TRUE if the specified marker exists.

bool QwtPlot::setMarkerXPos long  key,
double  val
 

Specify the X position of a marker.

Parameters:
key Marker key
val X position of the marker
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerYAxis long  key,
int  axis
 

Attach the marker to a Y axis.

Parameters:
key Marker key
axis Axis to be attached
Returns:
TRUE if the specified marker exists

bool QwtPlot::setMarkerYPos long  key,
double  val
 

Specify the Y position of the marker.

Parameters:
key Marker key
val Y position of the marker
Returns:
TRUE if the specified marker exists

void QwtPlot::setOutlinePen const QPen &  pn  ) 
 

Specify a pen for the outline.

Parameters:
pn new pen

void QwtPlot::setOutlineStyle Qwt::Shape  os  ) 
 

Specify the style of the outline.

The outline style determines which kind of shape is drawn in the plotting region when the user presses a mouse button or drags the mouse. Valid Styles are:

Parameters:
os Outline Style. Valid values are: Qwt::HLine, Qwt::VLine, Qwt::Cross, Qwt::Rect, Qwt::Ellipse
Qwt::Cross
Cross hairs are drawn across the plotting area when the user presses a mouse button. The lines intersect at the point where the mouse was pressed and move with the mouse pointer.
Qwt::HLine, Qwt::VLine
A horizontal or vertical line appears when the user presses a mouse button. This is useful for moving line markers.
Qwt::Rect
A rectangle is displayed when the user drags the mouse. One corner is fixed at the point where the mouse was pressed, and the opposite corner moves with the mouse pointer. This can be used for selecting regions.
Qwt::Ellipse
Similar to Qwt::Rect, but with an ellipse inside a bounding rectangle.
See also:
enableOutline()

void QwtPlot::setTitle const QString &  t  ) 
 

Change the plot's title.

Parameters:
t new title

void QwtPlot::setTitleFont const QFont &  f  ) 
 

Change the title font.

Parameters:
f new title font

QSize QwtPlot::sizeHint  )  const [virtual]
 

Return sizeHint

See also:
QwtPlot::minimumSizeHint()

QSizePolicy QwtPlot::sizePolicy  )  const [virtual]
 

Return MinimumExpanding/MinimumExpanding.

QString QwtPlot::title  )  const
 

Returns:
the plot's title

QFont QwtPlot::titleFont  )  const
 

Returns:
the plot's title font

const QLabel * QwtPlot::titleLabel  )  const
 

Returns:
the plot's titel label.

QLabel * QwtPlot::titleLabel  ) 
 

Returns:
the plot's titel label.

int QwtPlot::transform int  axis,
double  value
const
 

Transform a value into a coordinate in the plotting region.

Parameters:
axis axis index
value value
Returns:
X or y coordinate in the plotting region corresponding to the value.

void QwtPlot::updateAxes  )  [protected]
 

Rebuild the scales and maps.

void QwtPlot::updateLayout  )  [protected]
 

Adjust plot content to its current size.

See also:
QwtPlot::resizeEvent

void QwtPlot::updateLegendItem long  curveKey  )  [protected, virtual]
 

Update a QwtLegendButton for a specified curve.

Parameters:
curveKey curve key
See also:
QwtLegendButton, QwtLegend, insertLegendItem(), printLegendItem()

void QwtPlot::updateTabOrder  )  [protected, virtual]
 

Update the focus tab order.


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