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

Class PDMeshBasedShadingType

java.lang.Object

org.apache.pdfbox.pdmodel.graphics.shading.PDShading

org.apache.pdfbox.pdmodel.graphics.shading.PDTriangleBasedShadingType

org.apache.pdfbox.pdmodel.graphics.shading.PDShadingType4

org.apache.pdfbox.pdmodel.graphics.shading.PDMeshBasedShadingType

All Implemented Interfaces:

COSObjectable

Direct Known Subclasses:

PDShadingType6, PDShadingType7

abstract class PDMeshBasedShadingType
extends PDShadingType4

Common resources for shading types 6 and 7

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.apache.commons.logging.Log	LOG

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

SHADING_TYPE1, SHADING_TYPE2, SHADING_TYPE3, SHADING_TYPE4, SHADING_TYPE5, SHADING_TYPE6, SHADING_TYPE7

Constructor Summary

Constructors

Constructor	Description
PDMeshBasedShadingType(COSDictionary shadingDictionary)

Method Summary

Modifier and Type	Method	Description
(package private) final List<Patch>	collectPatches(AffineTransform xform, Matrix matrix, int controlPoints)	Create a patch list from a data stream, the returned list contains all the patches contained in the data stream.
(package private) abstract Patch	generatePatch(Point2D[] points, float[][] color)	Create a patch using control points and 4 corner color values, in Type6ShadingContext, a CoonsPatch is returned; in Type6ShadingContext, a TensorPatch is returned.
abstract Rectangle2D	getBounds(AffineTransform xform, Matrix matrix)	Calculate a bounding rectangle around the areas of this shading context.
(package private) Rectangle2D	getBounds(AffineTransform xform, Matrix matrix, int controlPoints)
protected Patch	readPatch(ImageInputStream input, boolean isFree, Point2D[] implicitEdge, float[][] implicitCornerColor, long maxSrcCoord, long maxSrcColor, PDRange rangeX, PDRange rangeY, PDRange[] colRange, Matrix matrix, AffineTransform xform, int controlPoints)	Read a single patch from a data stream, a patch contains information of its coordinates and color parameters.

Methods inherited from class org.apache.pdfbox.pdmodel.graphics.shading.PDShadingType4

collectTriangles, getBitsPerFlag, getShadingType, setBitsPerFlag, toPaint

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

getBitsPerComponent, getBitsPerCoordinate, getDecodeForParameter, getNumberOfColorComponents, interpolate, readVertex, setBitsPerComponent, setBitsPerCoordinate, setDecodeValues

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

create, evalFunction, evalFunction, getAntiAlias, getBackground, getBBox, getColorSpace, getCOSObject, getFunction, getType, setAntiAlias, setBackground, setBBox, setColorSpace, setFunction, setFunction, setShadingType

Methods inherited from class java.lang.Object

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

Field Details

LOG

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

Constructor Details

PDMeshBasedShadingType

PDMeshBasedShadingType(COSDictionary shadingDictionary)

Method Details

collectPatches

final List<Patch> collectPatches(AffineTransform xform,
 Matrix matrix,
 int controlPoints)
                          throws IOException

Create a patch list from a data stream, the returned list contains all the patches contained in the data stream.

Parameters:

xform - transformation for user to device space

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

controlPoints - number of control points, 12 for type 6 shading and 16 for type 7 shading

Returns:

the obtained patch list

Throws:

IOException - when something went wrong

readPatch

protected Patch readPatch(ImageInputStream input,
 boolean isFree,
 Point2D[] implicitEdge,
 float[][] implicitCornerColor,
 long maxSrcCoord,
 long maxSrcColor,
 PDRange rangeX,
 PDRange rangeY,
 PDRange[] colRange,
 Matrix matrix,
 AffineTransform xform,
 int controlPoints)
                   throws IOException

Read a single patch from a data stream, a patch contains information of its coordinates and color parameters.

Parameters:

input - the image source data stream

isFree - whether this is a free patch

implicitEdge - implicit edge when a patch is not free, otherwise it's not used

implicitCornerColor - implicit colors when a patch is not free, otherwise it's not used

maxSrcCoord - the maximum coordinate value calculated from source data

maxSrcColor - the maximum color value calculated from source data

rangeX - range for coordinate x

rangeY - range for coordinate y

colRange - range for color

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

xform - transformation for user to device space

controlPoints - number of control points, 12 for type 6 shading and 16 for type 7 shading

Returns:

a single patch

Throws:

IOException - when something went wrong

generatePatch

abstract Patch generatePatch(Point2D[] points,
 float[][] color)

Create a patch using control points and 4 corner color values, in Type6ShadingContext, a CoonsPatch is returned; in Type6ShadingContext, a TensorPatch is returned.

Parameters:

points - 12 or 16 control points

color - 4 corner colors

Returns:

a patch instance

getBounds

public abstract Rectangle2D getBounds(AffineTransform xform,
 Matrix matrix)
                               throws IOException

Description copied from class: PDShading

Calculate a bounding rectangle around the areas of this shading context.

Overrides:

getBounds in class PDTriangleBasedShadingType

Returns:

Bounding rectangle or null, if not supported by this shading type.

Throws:

IOException

getBounds

Rectangle2D getBounds(AffineTransform xform,
 Matrix matrix,
 int controlPoints)
               throws IOException

Throws:

IOException