org.eclipse.birt.chart.computation
Class BIRTChartComputation

java.lang.Object
  org.eclipse.birt.chart.computation.BIRTChartComputation

All Implemented Interfaces:

IChartComputation

public class BIRTChartComputation
extends java.lang.Object
implements IChartComputation

Constructor Summary

BIRTChartComputation()

Method Summary

void	applyWrapping(IDisplayServer xs, Label la, double dWrapping) Apply the wrapping to a label.
BoundingBox	computeBox(IDisplayServer xs, int iLabelLocation, Label la, double dX, double dY) Compute the bounding box ( location and size ) of a label.
double	computeFontHeight(IDisplayServer xs, Label la) Convenient method to compute the font's height of a label.
double	computeHeight(IDisplayServer xs, Label la) Compute the height of a label.
BoundingBox	computeLabelSize(IDisplayServer xs, Label la, double dWrapping, java.lang.Double fontHeight) Compute the size of a label.
RotatedRectangle	computePolygon(IDisplayServer xs, int iLabelLocation, Label la, double dX, double dY, java.lang.Double fontHeight) Compute the bounding polygon of a label.
double	computeWidth(IDisplayServer xs, Label la) Compute the width of a label.
void	dispose()
ITextMetrics	getTextMetrics(IDisplayServer xs, Label la, double wrapping) Returns a text metrics.
void	recycleTextMetrics(ITextMetrics itm) Dispose the text metrics.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BIRTChartComputation

public BIRTChartComputation()

Method Detail

computeFontHeight

public double computeFontHeight(IDisplayServer xs,
                                Label la)
                         throws ChartException

Description copied from interface: IChartComputation

Convenient method to compute the font's height of a label. This computation is costly, but in most case we do not change the font of a label, we just change the string value, so the font height will not changed. The purpose of the method is to get the font height overhead for reusing.

Specified by:

computeFontHeight in interface IChartComputation

Returns:

font height

Throws:

ChartException

getTextMetrics

public ITextMetrics getTextMetrics(IDisplayServer xs,
                                   Label la,
                                   double wrapping)

Description copied from interface: IChartComputation

Returns a text metrics.

Specified by:

getTextMetrics in interface IChartComputation

Returns:

computeLabelSize

public BoundingBox computeLabelSize(IDisplayServer xs,
                                    Label la,
                                    double dWrapping,
                                    java.lang.Double fontHeight)
                             throws ChartException

Description copied from interface: IChartComputation

Compute the size of a label.

Specified by:

computeLabelSize in interface IChartComputation

Returns:

Throws:

ChartException

computeBox

public BoundingBox computeBox(IDisplayServer xs,
                              int iLabelLocation,
                              Label la,
                              double dX,
                              double dY)
                       throws ChartException

Description copied from interface: IChartComputation

Compute the bounding box ( location and size ) of a label.

Specified by:

computeBox in interface IChartComputation

Returns:

Throws:

ChartException

computePolygon

public RotatedRectangle computePolygon(IDisplayServer xs,
                                       int iLabelLocation,
                                       Label la,
                                       double dX,
                                       double dY,
                                       java.lang.Double fontHeight)
                                throws ChartException

Description copied from interface: IChartComputation

Compute the bounding polygon of a label.

Specified by:

computePolygon in interface IChartComputation

Returns:

Throws:

ChartException

computeWidth

public double computeWidth(IDisplayServer xs,
                           Label la)
                    throws ChartException

Description copied from interface: IChartComputation

Compute the width of a label.

Specified by:

computeWidth in interface IChartComputation

Returns:

Throws:

ChartException

computeHeight

public double computeHeight(IDisplayServer xs,
                            Label la)
                     throws ChartException

Description copied from interface: IChartComputation

Compute the height of a label.

Specified by:

computeHeight in interface IChartComputation

Returns:

Throws:

ChartException

dispose

public void dispose()

Specified by:

dispose in interface IChartComputation

applyWrapping

public void applyWrapping(IDisplayServer xs,
                          Label la,
                          double dWrapping)
                   throws ChartException

Description copied from interface: IChartComputation

Apply the wrapping to a label.

Specified by:

applyWrapping in interface IChartComputation

Throws:

ChartException

recycleTextMetrics

public void recycleTextMetrics(ITextMetrics itm)

Description copied from interface: IChartComputation

Dispose the text metrics.

Specified by:

recycleTextMetrics in interface IChartComputation