Wt  3.3.9
Classes | Public Types | Public Member Functions | Static Public Attributes | Protected Types | Protected Member Functions | List of all members
Wt::Chart::WAxis Class Reference

Class which represents an axis of a cartesian chart. More...

#include <Wt/Chart/WAxis>

Classes

struct  TickLabel
 Represents a label/tick on the axis. More...
 

Public Types

typedef boost::function< double(double)> LabelTransform
 A label transform function. More...
 

Public Member Functions

 WAxis ()
 Constructor.
 
virtual ~WAxis ()
 Destructor.
 
Axis id () const
 Returns the axis id. More...
 
void setVisible (bool visible)
 Sets whether this axis is visible. More...
 
bool isVisible () const
 Returns whether this axis is visible. More...
 
void setLocation (AxisValue value)
 Sets the axis location. More...
 
AxisValue location () const
 Returns the axis location. More...
 
void setScale (AxisScale scale)
 Sets the scale of the axis. More...
 
AxisScale scale () const
 Returns the scale of the axis. More...
 
void setMinimum (double minimum)
 Sets the minimum value displayed on the axis. More...
 
double minimum () const
 Returns the minimum value displayed on the axis. More...
 
void setMaximum (double maximum)
 Sets the maximum value for the axis displayed on the axis. More...
 
double maximum () const
 Returns the maximum value displayed on the axis. More...
 
void setRange (double minimum, double maximum)
 Sets the axis range (minimum and maximum values) manually. More...
 
void setResolution (double resolution)
 Sets the axis resolution. More...
 
double resolution () const
 Returns the axis resolution. More...
 
void setAutoLimits (WFlags< AxisValue > locations)
 Let the minimum and/or maximum be calculated from the data. More...
 
WFlags< AxisValueautoLimits () const
 Returns the limits that are calculated automatically. More...
 
void setRoundLimits (WFlags< AxisValue > locations)
 Specifies whether limits should be rounded. More...
 
WFlags< AxisValueroundLimits () const
 Returns whether limits should be rounded. More...
 
void setBreak (double minimum, double maximum)
 Specifies a range that needs to be omitted from the axis. More...
 
void setLabelInterval (double labelInterval)
 Sets the label interval. More...
 
double labelInterval () const
 Returns the label interval. More...
 
void setLabelBasePoint (double point)
 Sets a point to be included as one of the labels (if possible). More...
 
double labelBasePoint () const
 Returns the base point for labels. More...
 
void setLabelFormat (const WString &format)
 Sets the label format. More...
 
WString labelFormat () const
 Returns the label format string. More...
 
void setLabelAngle (double angle)
 Sets the label angle. More...
 
double labelAngle () const
 Returns the label angle. More...
 
void setTitleOrientation (const Orientation &orientation)
 Sets the title orientation. More...
 
const OrientationtitleOrientation () const
 Returns the title orientation. More...
 
void setGridLinesEnabled (bool enabled)
 Sets whether gridlines are displayed for this axis. More...
 
bool isGridLinesEnabled () const
 Returns whether gridlines are displayed for this axis. More...
 
void setPen (const WPen &pen)
 Changes the pen used for rendering the axis and ticks. More...
 
const WPenpen () const
 Returns the pen used for rendering the axis and ticks. More...
 
void setTextPen (const WPen &pen)
 Changes the pen used for rendering labels for this axis. More...
 
const WPentextPen () const
 Returns the pen used for rendering labels for this axis. More...
 
void setGridLinesPen (const WPen &pen)
 Changes the pen used for rendering the grid lines. More...
 
const WPengridLinesPen () const
 Returns the pen used for rendering the grid lines. More...
 
void setMargin (int pixels)
 Sets the margin between the axis and the plot area. More...
 
int margin () const
 Returns the margin between the axis and the plot area. More...
 
void setTitle (const WString &title)
 Sets the axis title. More...
 
const WStringtitle () const
 Returns the axis title. More...
 
void setTitleFont (const WFont &titleFont)
 Sets the axis title font. More...
 
const WFonttitleFont () const
 Returns the axis title font. More...
 
void setTitleOffset (double offset)
 Sets the offset from the axis for the title label.
 
double titleOffset () const
 Returns the title offset.
 
void setLabelFont (const WFont &labelFont)
 Sets the axis label font. More...
 
const WFontlabelFont () const
 Returns the axis label font. More...
 
virtual WString label (double u) const
 Returns the label for a value. More...
 
void setZoomRange (double minimum, double maximum)
 Set the range to zoom to on this axis. More...
 
double zoomMinimum () const
 Get the zoom range minimum for this axis. More...
 
double zoomMaximum () const
 Get the zoom range maximum for this axis. More...
 
Signal< double, double > & zoomRangeChanged ()
 A signal triggered when the zoom range is changed on the client side. More...
 
void setZoom (double zoom)
 Sets the zoom level for this axis. More...
 
double zoom () const
 Get the zoom level for this axis. More...
 
void setMaxZoom (double maxZoom)
 Sets the maximum zoom level for this axis. More...
 
double maxZoom () const
 Get the maximum zoom level for this axis. More...
 
void setMinimumZoomRange (double size)
 Sets the minimum zoom range for this axis. More...
 
double minimumZoomRange () const
 Get the minimum zoom range for this axis. More...
 
void setPan (double pan)
 Sets the value to pan to for this axis. More...
 
double pan () const
 Get the value to pan to for this axis, when pan is enabled on the chart. More...
 
void setPadding (int padding)
 Sets the padding between the chart area and this axis. More...
 
int padding () const
 Returns the padding between the chart area and this axis. More...
 
void setTickDirection (TickDirection direction)
 Sets the direction that the axis ticks should point to. More...
 
TickDirection tickDirection () const
 Gets the direction that the axis ticks point to. More...
 
void setSoftLabelClipping (bool enabled)
 Enables soft clipping of axis labels. More...
 
bool softLabelClipping () const
 Returns whether soft label clipping is enabled. More...
 
void setInverted (bool inverted=true)
 Set whether this axis should be inverted. More...
 
bool inverted () const
 Get whether this axis is inverted. More...
 
void setLabelTransform (const LabelTransform &transform, AxisValue side)
 Set the transform function to apply to a given side. More...
 
LabelTransform labelTransform (AxisValue side) const
 Get the label transform configured for the given side. More...
 

Static Public Attributes

static const double AUTO_MINIMUM = -DBL_MAX
 Constant which indicates automatic minimum calculation. More...
 
static const double AUTO_MAXIMUM = DBL_MAX
 Constant which indicates automatic maximum calculation. More...
 

Protected Types

Protected Member Functions

virtual void getLabelTicks (std::vector< TickLabel > &ticks, int segment, AxisConfig config) const
 Returns the label (and ticks) information for this axis.
 
virtual WString autoDateFormat (const WDateTime &dt, DateTimeUnit unit, bool atTick) const
 Returns the Date format.
 

Detailed Description

Class which represents an axis of a cartesian chart.

A cartesian chart has two or three axes: an X axis (XAxis), a Y axis (YAxis) and optionally a second Y axis (Y2Axis). Each of the up to three axes in a cartesian chart has a unique id() that identifies which of these three axes it is in the enclosing chart().

Use setVisible() to change the visibility of an axis, setGridLinesEnabled() to show grid lines for an axis. The pen styles for rendering the axis or grid lines may be changed using setPen() and setGridLinesPen(). A margin between the axis and the main plot area may be configured using setMargin().

By default, the axis will automatically adjust its range so that all data will be visible. You may manually specify a range using setMinimum(), setMaximum or setRange(). The interval between labels is by default automatically adjusted depending on the axis length and the range, but may be manually specified using setLabelInterval().

The axis has support for being "broken", to support displaying data with a few outliers which would otherwise swamp the chart. This is not done automatically, but instead you need to use setBreak() to specify the value range that needs to be omitted from the axis. The omission is rendered in the axis and in bars that cross the break.

The labels are shown using a "%.4g" format string for numbers, and a suitable format for DateScale or DateTimeScale scales, based on heuristics. The format may be customized using setLabelFormat(). The angle of the label text may be changed using setLabelAngle(). By default, all labels are printed horizontally.

See also
WCartesianChart

Member Typedef Documentation

typedef boost::function<double (double)> Wt::Chart::WAxis::LabelTransform

A label transform function.

The label transform is a function from double to double.

See also
WAxis::setLabelTransform()

Member Function Documentation

WFlags< AxisValue > Wt::Chart::WAxis::autoLimits ( ) const

Returns the limits that are calculated automatically.

This returns the limits (Chart::MinimumValue and/or Chart::MaximumValue) that are calculated automatically from the data, rather than being specified manually using setMinimum() and/or setMaximum().

See also
setAutoLimits()
const WPen& Wt::Chart::WAxis::gridLinesPen ( ) const

Returns the pen used for rendering the grid lines.

See also
setGridLinesPen()
Axis Wt::Chart::WAxis::id ( ) const

Returns the axis id.

See also
chart(), WCartesianChart::axis()
bool Wt::Chart::WAxis::inverted ( ) const

Get whether this axis is inverted.

See also
setInverted()
bool Wt::Chart::WAxis::isGridLinesEnabled ( ) const

Returns whether gridlines are displayed for this axis.

See also
setGridLinesEnabled()
bool Wt::Chart::WAxis::isVisible ( ) const

Returns whether this axis is visible.

See also
setVisible()
WString Wt::Chart::WAxis::label ( double  u) const
virtual

Returns the label for a value.

This returns the label text that corresponds to a given value.

The default implementation uses the labelFormat() to properly represent the value.

double Wt::Chart::WAxis::labelAngle ( ) const

Returns the label angle.

See also
setLabelAngle()
double Wt::Chart::WAxis::labelBasePoint ( ) const

Returns the base point for labels.

See also
setLabelBasePoint()
const WFont& Wt::Chart::WAxis::labelFont ( ) const

Returns the axis label font.

See also
setLabelFont()
WString Wt::Chart::WAxis::labelFormat ( ) const

Returns the label format string.

See also
setLabelFormat()
double Wt::Chart::WAxis::labelInterval ( ) const

Returns the label interval.

See also
setLabelInterval()
WAxis::LabelTransform Wt::Chart::WAxis::labelTransform ( AxisValue  side) const

Get the label transform configured for the given side.

If no transform is configured for the given side, the identity function is returned.

See also
setLabelTransform()
AxisValue Wt::Chart::WAxis::location ( ) const

Returns the axis location.

See also
setLocation()
int Wt::Chart::WAxis::margin ( ) const

Returns the margin between the axis and the plot area.

See also
setMargin()
double Wt::Chart::WAxis::maximum ( ) const

Returns the maximum value displayed on the axis.

This returned the maximum value that was set using setMaximum(), or otherwise the automatically calculated (and rounded) maximum.

The numerical value corresponding to a data point is defined by it's AxisScale type.

See also
setMaximum(), setAutoLimits(), setRoundLimits()
double Wt::Chart::WAxis::maxZoom ( ) const

Get the maximum zoom level for this axis.

Only applies to a WCartesianChart in interactive mode.

See also
setMaxZoom()
Deprecated:
Use minimumZoomRange() instead
double Wt::Chart::WAxis::minimum ( ) const

Returns the minimum value displayed on the axis.

This returned the minimum value that was set using setMinimum(), or otherwise the automatically calculated (and rounded) minimum.

The numerical value corresponding to a data point is defined by it's AxisScale type.

See also
setMinimum(), setAutoLimits(), setRoundLimits()
double Wt::Chart::WAxis::minimumZoomRange ( ) const

Get the minimum zoom range for this axis.

Only applies to a WCartesianChart in interactive mode.

See also
setMinimumZoomRange()
int Wt::Chart::WAxis::padding ( ) const

Returns the padding between the chart area and this axis.

See also
setPadding()
double Wt::Chart::WAxis::pan ( ) const

Get the value to pan to for this axis, when pan is enabled on the chart.

Only applies to a WCartesianChart in interactive mode.

See also
setPan()
Deprecated:
Use zoomMinimum() instead.
const WPen& Wt::Chart::WAxis::pen ( ) const

Returns the pen used for rendering the axis and ticks.

See also
setPen()
double Wt::Chart::WAxis::resolution ( ) const

Returns the axis resolution.

See also
setResolution()
WFlags<AxisValue> Wt::Chart::WAxis::roundLimits ( ) const

Returns whether limits should be rounded.

See also
setRoundLimits()
AxisScale Wt::Chart::WAxis::scale ( ) const

Returns the scale of the axis.

See also
setScale()
void Wt::Chart::WAxis::setAutoLimits ( WFlags< AxisValue locations)

Let the minimum and/or maximum be calculated from the data.

Using this method, you can indicate that you want to have automatic limits, rather than limits set manually using setMinimum() or setMaximum().

locations can be Chart::MinimumValue and/or Chart::MaximumValue.

The default value is Chart::MinimumValue | Chart::MaximumValue.

void Wt::Chart::WAxis::setBreak ( double  minimum,
double  maximum 
)

Specifies a range that needs to be omitted from the axis.

This is useful to display data with a few outliers which would otherwise swamp the chart. This is not done automatically, but instead you need to use setBreak() to specify the value range that needs to be omitted from the axis. The omission is rendered in the axis and in BarSeries that cross the break.

Note
This feature is incompatible with the interactive features of WCartesianChart.
void Wt::Chart::WAxis::setGridLinesEnabled ( bool  enabled)

Sets whether gridlines are displayed for this axis.

When enabled, gird lines are drawn for each tick on this axis, using the gridLinesPen().

Unlike all other visual aspects of an axis, rendering of the gridlines is not controlled by setDisplayEnabled().

See also
setGridLinesPen(), isGridLinesEnabled()
void Wt::Chart::WAxis::setGridLinesPen ( const WPen pen)

Changes the pen used for rendering the grid lines.

The default value is a gray pen of 0 width.

See also
setPen(), gridLinesPen().
void Wt::Chart::WAxis::setInverted ( bool  inverted = true)

Set whether this axis should be inverted.

When inverted, the axis will be drawn in the opposite direction, e.g. if normally, the low values are on the left and high values on the right, when inverted, the low values will be on the right and high values on the left.

void Wt::Chart::WAxis::setLabelAngle ( double  angle)

Sets the label angle.

Sets the angle used for displaying the labels (in degrees). A 0 angle corresponds to horizontal text.

The default value is 0.0.

See also
labelAngle()
void Wt::Chart::WAxis::setLabelBasePoint ( double  point)

Sets a point to be included as one of the labels (if possible).

The given point will be included as one of the labels, by adjusting the minimum value on the axis, if that minimum is auto-computed. This is only applicable to a Linear scale axis.

The default value is 0.0.

See also
setRoundLimits()
void Wt::Chart::WAxis::setLabelFont ( const WFont labelFont)

Sets the axis label font.

The default label font is a 10 point Sans Serif font.

See also
labelFont()
void Wt::Chart::WAxis::setLabelFormat ( const WString format)

Sets the label format.

Sets a format string which is used to format values, both for the axis labels as well as data series values (see WDataSeries::setLabelsEnabled()).

For an axis with a LinearScale or LogScale scale, the format string must be a format string that is accepted by snprintf() and which formats one double. If the format string is an empty string, then WLocale::toString() is used.

For an axis with a DateScale scale, the format string must be a format string accepted by WDate::toString(), to format a date. If the format string is an empty string, a suitable format is chosen based on heuristics.

For an axis with a DateTimeScale scale, the format string must be a format string accepted by WDateTime::toString(), to format a date. If the format string is an empty string, a suitable format is chosen based on heuristics.

The default value is "%.4g" for a numeric axis, and a suitable format for date(time) scales based on a heuristic taking into account the current axis range.

See also
labelFormat()
void Wt::Chart::WAxis::setLabelInterval ( double  labelInterval)

Sets the label interval.

Specifies the interval for displaying labels (and ticks) on the axis. The default value is 0.0, and indicates that the interval should be computed automatically.

The unit for the label interval is in logical units (i.e. the same as minimum or maximum).

See also
setLabelFormat()
void Wt::Chart::WAxis::setLabelTransform ( const LabelTransform transform,
AxisValue  side 
)

Set the transform function to apply to a given side.

The label transform must be a function from double to double, and will be applied on the double value of the model coordinate of every axis tick.

The label transform will not move the position of the axis ticks, only change the labels displayed at the ticks.

This can be useful in combination with a location() set to BothSides, to show different labels on each side.

If DateScale or DateTimeScale are used, the double value will be in seconds since the Epoch (00:00:00 UTC, January 1, 1970).

Only MinimumValue, ZeroValue and MaximumValue are accepted for side. If you set a label transform for another side, the label transform will not be used.

The label transform will not be used if the scale() is CategoryScale.

void Wt::Chart::WAxis::setLocation ( AxisValue  value)

Sets the axis location.

Configures the location of the axis, relative to values on the other axis (i.e. Y values for the X axis, and X values for the Y axis).

The default value is Chart::MinimumValue.

See also
location()
void Wt::Chart::WAxis::setMargin ( int  pixels)

Sets the margin between the axis and the plot area.

The margin is defined in pixels.

The default value is 0.

See also
margin()
void Wt::Chart::WAxis::setMaximum ( double  maximum)

Sets the maximum value for the axis displayed on the axis.

By default, the minimum and maximum values are determined automatically so that all the data can be displayed.

The numerical value corresponding to a data point is defined by it's AxisScale type.

See also
setMinimum(), setAutoLimits()
void Wt::Chart::WAxis::setMaxZoom ( double  maxZoom)

Sets the maximum zoom level for this axis.

Only applies to a WCartesianChart in interactive mode. The zoom level should be >= 1 (1 = no zoom).

Note
This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
Deprecated:
Use setMinimumZoomRange(double) instead
void Wt::Chart::WAxis::setMinimum ( double  minimum)

Sets the minimum value displayed on the axis.

By default, the minimum and maximum values are determined automatically so that all the data can be displayed.

The numerical value corresponding to a data point is defined by it's AxisScale type.

See also
setMaximum(), setAutoLimits()
void Wt::Chart::WAxis::setMinimumZoomRange ( double  size)

Sets the minimum zoom range for this axis.

Only applies to a WCartesianChart in interactive mode.

This range is the smallest difference there can be between zoomMinimum() and zoomMaximum().

Note
This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
void Wt::Chart::WAxis::setPadding ( int  padding)

Sets the padding between the chart area and this axis.

See also
padding()
void Wt::Chart::WAxis::setPan ( double  pan)

Sets the value to pan to for this axis.

This sets the leftmost (horizontal axis) or bottom (vertical axis) value to be displayed on the chart.

Note that if this would cause the chart to go out of bounds, the panning of the chart will be automatically adjusted.

Only applies to a WCartesianChart in interactive mode.

Note
This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
If the pan position has been changed on the client side, this may not reflect the actual pan position.
Deprecated:
Use setZoomRange() instead.
void Wt::Chart::WAxis::setPen ( const WPen pen)

Changes the pen used for rendering the axis and ticks.

The default value is a black pen of 0 width.

See also
setGridLinesPen().
void Wt::Chart::WAxis::setRange ( double  minimum,
double  maximum 
)

Sets the axis range (minimum and maximum values) manually.

Specifies both minimum and maximum value for the axis. This automatically disables automatic range calculation.

The numerical value corresponding to a data point is defined by it's AxisScale type.

See also
setMinimum(), setMaximum()
void Wt::Chart::WAxis::setResolution ( double  resolution)

Sets the axis resolution.

Specifies the axis resolution, in case maximum-minimum < resolution minimum and maximum are modified so the maximum - minimum = resolution

The default resolution is 0, which uses a built-in epsilon.

See also
resolution()
void Wt::Chart::WAxis::setRoundLimits ( WFlags< AxisValue locations)

Specifies whether limits should be rounded.

When enabling rounding, this has the effect of rounding down the minimum value, or rounding up the maximum value, to the nearest label interval.

By default, rounding is enabled for an auto-calculated limited, and disabled for a manually specifed limit.

See also
setAutoLimits()
void Wt::Chart::WAxis::setScale ( AxisScale  scale)

Sets the scale of the axis.

For the X scale in a CategoryChart, the scale should be left unchanged to CategoryScale.

For all other axes, the default value is LinearScale, but this may be changed to LogScale or DateScale. DateScale is only useful for the X axis in a ScatterPlot which contains WDate values.

See also
scale()
void Wt::Chart::WAxis::setSoftLabelClipping ( bool  enabled)

Enables soft clipping of axis labels.

This is set to false by for a 3D chart and to true for a 2D chart.

This setting determines how labels should be clipped in case not the entire axis is visible due to clipping. "Hard" clipping is done by the paint device and may truncate labels. "Soft" clipping will determine if the corresponding tick is visible, and draw the label (unclipped), preventing labels from being truncated. For a 2D chart, this feature is only relevant when zoom is enabled on a WCartesianChart.

WAxis-partialLabelClipping-disabled.png
Soft clipping enabled (slower).
This is the default for WCartesianChart. The tick for 0 is visible, and the 0 is shown completely. The tick for 01/01/86 is not visible, so its label is not shown.
WAxis-partialLabelClipping-enabled.png
Soft clipping disabled (faster).
The tick of the 0 is visible, but the 0 is shown partially. Also, the tick of 01/01/86 is not visible, but the label is partially shown.
void Wt::Chart::WAxis::setTextPen ( const WPen pen)

Changes the pen used for rendering labels for this axis.

The default value is a black pen of 0 width.

See also
setGridLinesPen().
setPen().
WCartesianChart::setTextPen()
void Wt::Chart::WAxis::setTickDirection ( TickDirection  direction)

Sets the direction that the axis ticks should point to.

If set to Outwards, the axis ticks will point outside of the chart, and the labels will be on the outside.

If set to Inwards, the axis ticks will point inside of the chart, and the labels will be on the inside. Also, the padding() will be set to 25.

See also
tickDirection()
setPadding()
void Wt::Chart::WAxis::setTitle ( const WString title)

Sets the axis title.

The default title is empty.

See also
title()
void Wt::Chart::WAxis::setTitleFont ( const WFont titleFont)

Sets the axis title font.

The default title font is a 12 point Sans Serif font.

See also
titleFont()
void Wt::Chart::WAxis::setTitleOrientation ( const Orientation orientation)

Sets the title orientation.

Sets the orientation used for displaying the title.

The default value is Horizontal

See also
titleOrientation()
void Wt::Chart::WAxis::setVisible ( bool  visible)

Sets whether this axis is visible.

Changes whether the axis is displayed, including ticks and labels. The rendering of the grid lines is controlled seperately by setGridLinesEnabled().

The default value is true for the X axis and first Y axis, but false for the second Y axis.

See also
setGridLinesEnabled().
void Wt::Chart::WAxis::setZoom ( double  zoom)

Sets the zoom level for this axis.

Only applies to a WCartesianChart in interactive mode. The zoom level should be >= 1 and smaller than maxZoom()

Note
This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
Deprecated:
Use setZoomRange() instead.
void Wt::Chart::WAxis::setZoomRange ( double  minimum,
double  maximum 
)

Set the range to zoom to on this axis.

The minimum is the lowest value to be displayed, and the maximum is the highest value to be displayed.

If the difference between minimum and maximum is less than minimumZoomRange(), the zoom range will be made more narrow around the center of minimum and maximum.

If the given minimum is larger than the given maximum, the two values are swapped.

Only applies to a WCartesianChart in interactive mode.

Note
This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
bool Wt::Chart::WAxis::softLabelClipping ( ) const

Returns whether soft label clipping is enabled.

See also
setSoftLabelCLipping()
const WPen& Wt::Chart::WAxis::textPen ( ) const

Returns the pen used for rendering labels for this axis.

See also
setTextPen()
TickDirection Wt::Chart::WAxis::tickDirection ( ) const

Gets the direction that the axis ticks point to.

See also
setTickDirection()
const WString& Wt::Chart::WAxis::title ( ) const

Returns the axis title.

See also
setTitle()
const WFont& Wt::Chart::WAxis::titleFont ( ) const

Returns the axis title font.

See also
setTitleFont()
const Orientation& Wt::Chart::WAxis::titleOrientation ( ) const

Returns the title orientation.

See also
setTitleOrientation()
double Wt::Chart::WAxis::zoom ( ) const

Get the zoom level for this axis.

Only applies to a WCartesianChart in interactive mode.

See also
setZoom()
Deprecated:
Use zoomMinimum() and zoomMaximum() instead.
double Wt::Chart::WAxis::zoomMaximum ( ) const

Get the zoom range maximum for this axis.

Only applies to a WCartesianChart in interactive mode.

See also
setZoomRange()
double Wt::Chart::WAxis::zoomMinimum ( ) const

Get the zoom range minimum for this axis.

Only applies to a WCartesianChart in interactive mode.

See also
setZoomRange()
Signal<double, double>& Wt::Chart::WAxis::zoomRangeChanged ( )

A signal triggered when the zoom range is changed on the client side.

Only applies to a WCartesianChart in interactive mode.

Note
If you want to use this signal, you must connect a signal listener before the chart is rendered.

Member Data Documentation

const double Wt::Chart::WAxis::AUTO_MAXIMUM = DBL_MAX
static

Constant which indicates automatic maximum calculation.

See also
setMaximum()
const double Wt::Chart::WAxis::AUTO_MINIMUM = -DBL_MAX
static

Constant which indicates automatic minimum calculation.

See also
setMinimum()

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