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:

java.awt.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 static org.apache.commons.logging.Log	LOG
private java.util.List<ShadedTriangle>	triangleList	triangle list.

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

bitsPerColorComponent, bitsPerCoordinate, numberOfColorComponents

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected 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.
void	dispose()
private float	interpolate(float src, long srcMax, float dstMin, float dstMax)	Calculate the interpolation, see p.345 pdf spec 1.7.
protected boolean	isDataEmpty()	Returns true if the shading has an empty data stream.
protected Vertex	readVertex(javax.imageio.stream.ImageInputStream input, long maxSrcCoord, long maxSrcColor, PDRange rangeX, PDRange rangeY, PDRange[] colRangeTab, Matrix matrix, java.awt.geom.AffineTransform xform)	Read a vertex from the bit input stream performs interpolations.
(package private) void	setTriangleList(java.util.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 Detail

LOG

private static final org.apache.commons.logging.Log LOG

triangleList

private java.util.List<ShadedTriangle> triangleList

triangle list.

Constructor Detail

GouraudShadingContext

protected GouraudShadingContext(PDShading shading,
                                java.awt.image.ColorModel colorModel,
                                java.awt.geom.AffineTransform xform,
                                Matrix matrix)
                         throws java.io.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:

java.io.IOException - if something went wrong

Method Detail

readVertex

protected Vertex readVertex(javax.imageio.stream.ImageInputStream input,
                            long maxSrcCoord,
                            long maxSrcColor,
                            PDRange rangeX,
                            PDRange rangeY,
                            PDRange[] colRangeTab,
                            Matrix matrix,
                            java.awt.geom.AffineTransform xform)
                     throws java.io.IOException

Read a vertex from the bit input stream performs interpolations.

Parameters:

input - bit input stream

maxSrcCoord - max value for source coordinate (2^bits-1)

maxSrcColor - max value for source color (2^bits-1)

rangeX - dest range for X

rangeY - dest range for Y

colRangeTab - dest range array for colors

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

Returns:

a new vertex with the flag and the interpolated values

Throws:

java.io.IOException - if something went wrong

setTriangleList

final void setTriangleList(java.util.List<ShadedTriangle> triangleList)

calcPixelTable

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

java.io.IOException

dispose

public void dispose()

Specified by:

dispose in interface java.awt.PaintContext

Overrides:

dispose in class TriangleBasedShadingContext

interpolate

private float interpolate(float src,
                          long srcMax,
                          float dstMin,
                          float dstMax)

Calculate the interpolation, see p.345 pdf spec 1.7.

Parameters:

src - src value

srcMax - max src value (2^bits-1)

dstMin - min dst value

dstMax - max dst value

Returns:

interpolated value

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