gnu.apdf

Class PDFShadingGouraudFreeform

java.lang.Object

gnu.apdf.PDFObject

gnu.apdf.PDFStream

gnu.apdf.PDFShading

gnu.apdf.PDFShadingGouraudFreeform

All Implemented Interfaces:

Serializable

public class PDFShadingGouraudFreeform
extends PDFShading

Class for the PDF Gouraud free-form shading object, used in implementing the drawVertices method in PDFCanvas.

Author:

jsevy

See Also:

Serialized Form

Field Summary

Fields inherited from class gnu.apdf.PDFShading

backgroundColor, boundingBox, colorSpace, shadingType

Constructor Summary

Constructors

Constructor and Description
PDFShadingGouraudFreeform(Canvas.VertexMode vertexMode, int vertexCount, float[] vertices, int vertexOffset, int[] colors, int colorOffset) Constructor for Gouraud free-form triangular mesh shading pattern, type 4.

Method Summary

Modifier and Type	Method and Description
String	getStreamDataString() Method used for debugging - prints the information in the shading data stream.
void	writeDictionary(OutputStream os) Write relevant parameters to dictionary - here, BitsPerCoordinate, BitsPerComponent, BitsPerFlag, and the Decode array.

Methods inherited from class gnu.apdf.PDFShading

write

Methods inherited from class gnu.apdf.PDFStream

getDeflate, getOutputStream, getStream, getWriter, setDeflate, writeStream

Methods inherited from class gnu.apdf.PDFObject

getGeneration, getName, getPDFDocument, getSerialID, getType, setName, toArray, toString, writeEnd, writeStart

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PDFShadingGouraudFreeform

public PDFShadingGouraudFreeform(Canvas.VertexMode vertexMode,
                                 int vertexCount,
                                 float[] vertices,
                                 int vertexOffset,
                                 int[] colors,
                                 int colorOffset)

Constructor for Gouraud free-form triangular mesh shading pattern, type 4. Used to implement drawVertices method of PDFCanvas. The vertices array specifies the x,y pairs for each vertex. The colors array specifies the color at each vertex; the colors at each vertex are interpolated across the corresponding triangle in a gradient.

The VertexMode determines how the subsequent points in the sequence of vertices are interpreted.

• TRIANGLES In this mode each triple of points (6 successive coordinates) is treated as a separate triangle. This is the most general mode; no assumption is made about triangle adjacency.
• TRIANGLE_STRIP In this mode each successive vertex is combined with the two before it to form a new triangle, giving a "strip" of triangles where each shares an edge with the triangle before it
• TRIANGLE_FAN In this mode the first point is assumed to be the center vertex for all of the triangles, with subsequent points defining the "outer" vertices of the fan arranged radially around the center. The triangles are thus "pie wedges" with the first point at the center of the pie, and each "wedge" sharing an edge and vertex. Note that the first and last outer vertices are not automatically joined.

Parameters:

vertexMode - Indicates how successive coordinate pairs are to be interpreted, as described above

vertexCount - Number of vertices to include in the mesh

vertices - Array of vertex coordinates, as a sequence of x,y pairs

vertexOffset - Offset in vertex array of first coordinate to use for mesh

colors - Array of colors specifying the color for each vertex

colorOffset - Offset in color array for starting element

Method Detail

writeDictionary

public void writeDictionary(OutputStream os)
                     throws IOException

Write relevant parameters to dictionary - here, BitsPerCoordinate, BitsPerComponent, BitsPerFlag, and the Decode array.

Overrides:

writeDictionary in class PDFShading

Parameters:

os -

Throws:

IOException

getStreamDataString

public String getStreamDataString()

Method used for debugging - prints the information in the shading data stream.

Overrides:

getStreamDataString in class PDFStream

Returns:

Human-readable string with stream contents in hex