org.apache.fop.render.ps.Gradient Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render.ps;
import java.util.List;
import org.apache.fop.render.gradient.Function;
import org.apache.fop.render.gradient.Function.SubFunctionRenderer;
import org.apache.fop.render.gradient.GradientMaker.DoubleFormatter;
import org.apache.fop.render.gradient.Pattern;
import org.apache.fop.render.gradient.Shading;
/**
* Helper class to draw gradients in PostScript.
*/
public final class Gradient {
private Gradient() { }
public static String outputPattern(Pattern pattern, DoubleFormatter doubleFormatter) {
StringBuilder p = new StringBuilder(64);
p.append("/Pattern setcolorspace\n");
p.append("<< \n/Type /Pattern \n");
p.append("/PatternType " + pattern.getPatternType() + " \n");
if (pattern.getShading() != null) {
p.append("/Shading ");
outputShading(p, pattern.getShading(), doubleFormatter);
p.append(" \n");
}
p.append(">> \n");
List matrix = pattern.getMatrix();
if (matrix == null) {
p.append("matrix ");
} else {
p.append("[ ");
for (double m : pattern.getMatrix()) {
p.append(doubleFormatter.formatDouble(m));
p.append(" ");
}
p.append("] ");
}
p.append("makepattern setcolor\n");
return p.toString();
}
private static void outputShading(StringBuilder out, Shading shading, final DoubleFormatter doubleFormatter) {
final Function function = shading.getFunction();
Shading.FunctionRenderer functionRenderer = new Shading.FunctionRenderer() {
public void outputFunction(StringBuilder out) {
SubFunctionRenderer subFunctionRenderer = new Function.SubFunctionRenderer() {
public void outputFunction(StringBuilder out, int functionIndex) {
Function subFunction = function.getFunctions().get(functionIndex);
assert subFunction.getFunctions().isEmpty();
subFunction.output(out, doubleFormatter, null);
}
};
function.output(out, doubleFormatter, subFunctionRenderer);
}
};
shading.output(out, doubleFormatter, functionRenderer);
}
}