Package org.apache.pdfbox.pdmodel.graphics.shading

Class GouraudShadingContext

java.lang.Object

org.apache.pdfbox.pdmodel.graphics.shading.ShadingContext

org.apache.pdfbox.pdmodel.graphics.shading.TriangleBasedShadingContext

org.apache.pdfbox.pdmodel.graphics.shading.GouraudShadingContext

All Implemented Interfaces:

PaintContext

Direct Known Subclasses:

Type4ShadingContext, Type5ShadingContext

abstract class GouraudShadingContext
extends TriangleBasedShadingContext

Shades Gouraud triangles for Type4ShadingContext and Type5ShadingContext.

Field Summary

Fields

Modifier and Type	Field	Description
private List<ShadedTriangle>	triangleList	triangle list.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GouraudShadingContext(PDShading shading, ColorModel colorModel, AffineTransform xform, Matrix matrix)	Constructor creates an instance to be used for fill operations.

Method Summary

Modifier and Type	Method	Description
protected Map<Point,Integer>	calcPixelTable(Rectangle deviceBounds)	Calculate every point and its color and store them in a Hash table.
void	dispose()
protected boolean	isDataEmpty()	Returns true if the shading has an empty data stream.
(package private) final void	setTriangleList(List<ShadedTriangle> triangleList)

Methods inherited from class org.apache.pdfbox.pdmodel.graphics.shading.TriangleBasedShadingContext

calcPixelTable, createPixelTable, getColorModel, getRaster

Methods inherited from class org.apache.pdfbox.pdmodel.graphics.shading.ShadingContext

convertToRGB, getBackground, getRgbBackground, getShading, getShadingColorSpace

Methods inherited from class java.lang.Object

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

Field Details

triangleList

private List<ShadedTriangle> triangleList

triangle list.

Constructor Details

GouraudShadingContext

protected GouraudShadingContext(PDShading shading,
 ColorModel colorModel,
 AffineTransform xform,
 Matrix matrix)
                         throws IOException

Constructor creates an instance to be used for fill operations.

Parameters:

shading - the shading type to be used

colorModel - the color model to be used

xform - transformation for user to device space

matrix - the pattern matrix concatenated with that of the parent content stream

Throws:

IOException - if something went wrong

Method Details

setTriangleList

final void setTriangleList(List<ShadedTriangle> triangleList)

calcPixelTable

protected Map<Point,Integer> calcPixelTable(Rectangle deviceBounds)
                                     throws IOException

Description copied from class: TriangleBasedShadingContext

Calculate every point and its color and store them in a Hash table.

Specified by:

calcPixelTable in class TriangleBasedShadingContext

Returns:

a Hash table which contains all the points' positions and colors of one image

Throws:

IOException

dispose

public void dispose()

Specified by:

dispose in interface PaintContext

Overrides:

dispose in class TriangleBasedShadingContext

isDataEmpty

protected boolean isDataEmpty()

Description copied from class: TriangleBasedShadingContext

Returns true if the shading has an empty data stream.

Specified by:

isDataEmpty in class TriangleBasedShadingContext