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

Class TriangleBasedShadingContext

java.lang.Object

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

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

All Implemented Interfaces:

java.awt.PaintContext

Direct Known Subclasses:

GouraudShadingContext, PatchMeshesShadingContext

abstract class TriangleBasedShadingContext
extends ShadingContext

Intermediate class extended by the shading types 4,5,6 and 7 that contains the common methods used by these classes.

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.Map<java.awt.Point,java.lang.Integer>	pixelTable

Constructor Summary

Constructors

Constructor	Description
TriangleBasedShadingContext(PDShading shading, java.awt.image.ColorModel cm, java.awt.geom.AffineTransform xform, Matrix matrix)	Constructor.

Method Summary

Modifier and Type	Method	Description
(package private) abstract java.util.Map<java.awt.Point,java.lang.Integer>	calcPixelTable(java.awt.Rectangle deviceBounds)	Calculate every point and its color and store them in a Hash table.
protected void	calcPixelTable(java.util.List<ShadedTriangle> triangleList, java.util.Map<java.awt.Point,java.lang.Integer> map, java.awt.Rectangle deviceBounds)	Get the points from the triangles, calculate their color and add point-color mappings.
protected void	createPixelTable(java.awt.Rectangle deviceBounds)	Creates the pixel table.
private int	evalFunctionAndConvertToRGB(float[] values)	Convert color to RGB color value, using function if required, then convert from the shading color space to an RGB value, which is encoded into an integer.
java.awt.image.Raster	getRaster(int x, int y, int w, int h)
(package private) abstract boolean	isDataEmpty()	Returns true if the shading has an empty data stream.

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

convertToRGB, dispose, getBackground, getColorModel, getRgbBackground, getShading, getShadingColorSpace

Methods inherited from class java.lang.Object

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

Field Detail

pixelTable

private java.util.Map<java.awt.Point,java.lang.Integer> pixelTable

Constructor Detail

TriangleBasedShadingContext

TriangleBasedShadingContext(PDShading shading,
                            java.awt.image.ColorModel cm,
                            java.awt.geom.AffineTransform xform,
                            Matrix matrix)
                     throws java.io.IOException

Constructor.

Parameters:

shading - the shading type to be used

cm - 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:

java.io.IOException - if there is an error getting the color space or doing background color conversion.

Method Detail

createPixelTable

protected final void createPixelTable(java.awt.Rectangle deviceBounds)
                               throws java.io.IOException

Creates the pixel table.

Throws:

java.io.IOException

calcPixelTable

abstract java.util.Map<java.awt.Point,java.lang.Integer> calcPixelTable(java.awt.Rectangle deviceBounds)
                                                                       throws java.io.IOException

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

Returns:

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

Throws:

java.io.IOException

calcPixelTable

protected void calcPixelTable(java.util.List<ShadedTriangle> triangleList,
                              java.util.Map<java.awt.Point,java.lang.Integer> map,
                              java.awt.Rectangle deviceBounds)
                       throws java.io.IOException

Get the points from the triangles, calculate their color and add point-color mappings.

Throws:

java.io.IOException

evalFunctionAndConvertToRGB

private int evalFunctionAndConvertToRGB(float[] values)
                                 throws java.io.IOException

Convert color to RGB color value, using function if required, then convert from the shading color space to an RGB value, which is encoded into an integer.

Throws:

java.io.IOException

isDataEmpty

abstract boolean isDataEmpty()

Returns true if the shading has an empty data stream.

getRaster

public final java.awt.image.Raster getRaster(int x,
                                             int y,
                                             int w,
                                             int h)