IChartComputation (BIRT Chart Engine API)

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org.eclipse.birt.chart.computation
Interface IChartComputation

All Known Implementing Classes:: BIRTChartComputation

public interface IChartComputation

Method Summary
`void`	`applyWrapping(IDisplayServer xs, Label la, double dWapping)` 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.

Method Detail

dispose

void dispose()

getTextMetrics

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

Returns a text metrics.

Parameters:: xs -; la -; wrapping -
Returns:

recycleTextMetrics

void recycleTextMetrics(ITextMetrics itm)

Dispose the text metrics.

Parameters:: itm -

computeFontHeight

double computeFontHeight(IDisplayServer xs,
                         Label la)
                         throws ChartException

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.

Parameters:: xs -; la -
Returns:: font height
Throws:: ChartException

computeLabelSize

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

Compute the size of a label.

Parameters:: xs -; la -; dWrapping -; fontHeight -
Returns:
Throws:: ChartException

computeBox

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

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

Parameters:: xs -; iLabelLocation -; la -; dX -; dY -
Returns:
Throws:: ChartException

computePolygon

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

Compute the bounding polygon of a label.

Parameters:: xs -; iLabelLocation -; la -; dX -; dY -; fontHeight -
Returns:
Throws:: ChartException

computeWidth

double computeWidth(IDisplayServer xs,
                    Label la)
                    throws ChartException

Compute the width of a label.

Parameters:: xs -; la -
Returns:
Throws:: ChartException

computeHeight

double computeHeight(IDisplayServer xs,
                     Label la)
                     throws ChartException

Compute the height of a label.

Parameters:: xs -; la -
Returns:
Throws:: ChartException

applyWrapping

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

Apply the wrapping to a label.

Parameters:: xs -; la -; dWapping -
Throws:: ChartException