de.intarsys.pdf.pd.PDFunctionBasedShading Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * - Redistributions in binary form must reproduce the above copyright notice,
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package de.intarsys.pdf.pd;

import de.intarsys.pdf.cds.CDSMatrix;
import de.intarsys.pdf.cos.COSArray;
import de.intarsys.pdf.cos.COSBasedObject;
import de.intarsys.pdf.cos.COSDictionary;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.cos.COSNumber;
import de.intarsys.pdf.cos.COSObject;

/**
 * Evaluate a function when filling the shape.
 * 
 */
public class PDFunctionBasedShading extends PDShading {
	/**
	 * The meta class implementation
	 */
	static public class MetaClass extends PDShading.MetaClass {
		protected MetaClass(Class paramInstanceClass) {
			super(paramInstanceClass);
		}

		@Override
		protected COSBasedObject doCreateCOSBasedObject(COSObject object) {
			return new PDFunctionBasedShading(object);
		}
	}

	public static final COSName DK_Domain = COSName.constant("Domain"); //$NON-NLS-1$
	public static final COSName DK_Function = COSName.constant("Function"); //$NON-NLS-1$
	private static final COSName DK_Matrix = COSName.constant("Matrix"); //$NON-NLS-1$

	/** The meta class instance */
	static public final MetaClass META = new MetaClass(MetaClass.class
			.getDeclaringClass());

	private float[] domain;

	private PDFunction function;

	protected PDFunctionBasedShading(COSObject object) {
		super(object);

		COSArray cosDomain;

		cosDomain = (COSArray) ((COSDictionary) object).get(DK_Domain);
		if (domain == null) {
			domain = new float[] { 0, 1, 0, 1 };
		} else {
			domain = new float[4];
			for (int index = 0; index < 4; index++) {
				domain[index] = ((COSNumber) cosDomain.get(index)).floatValue();
			}
		}
	}

	public float[] getDomain() {
		return domain;
	}

	public PDFunction getFunction() {
		if (function == null) {
			function = (PDFunction) PDFunction.META
					.createFromCos(((COSDictionary) cosGetObject())
							.get(DK_Function));
		}
		return function;
	}

	public CDSMatrix getMatrix() {
		return CDSMatrix.createFromCOS(cosGetField(DK_Matrix).asArray());
	}

	@Override
	public int getShadingType() {
		return SHADING_TYPE_FUNCTIONBASED;
	}

}