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/*
* 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.shading;
import java.awt.Color;
import java.util.ArrayList;
import java.util.List;
import org.apache.xmlgraphics.java2d.color.ColorUtil;
import org.apache.fop.pdf.PDFDeviceColorSpace;
import org.apache.fop.render.ps.svg.PSSVGGraphics2D;
public abstract class GradientFactory {
static GradientRegistrar registrar;
/**
* Constructor
* @param registrar The object used to register new embedded objects in the
* output format.
*/
public static GradientFactory newInstance(GradientRegistrar theRegistrar) {
registrar = theRegistrar;
if (registrar instanceof PSSVGGraphics2D) {
return new PSGradientFactory();
} else {
return new PDFGradientFactory();
}
}
/**
* Creates a new gradient
* @param radial Determines whether the gradient is radial
* @param theColorspace The colorspace used in PDF and Postscript
* @param theColors The colors to be used in the gradient
* @param theBounds The bounds of each color
* @param theCoords The co-ordinates of the gradient
* @param theMatrix The matrix for any transformations
* @return Returns the Pattern object of the gradient
*/
public abstract Pattern createGradient(boolean radial,
PDFDeviceColorSpace theColorspace, List<Color> theColors, List<Double> theBounds,
List<Double> theCoords, List<Double> theMatrix);
protected Pattern makeGradient(boolean radial, PDFDeviceColorSpace theColorspace,
List<Color> theColors, List<Double> theBounds,
List<Double> theCoords, List<Double> theMatrix) {
Shading myShad;
Function myfunky;
Function myfunc;
List<Double> theCzero;
List<Double> theCone;
double interpolation = 1.000;
List<Function> theFunctions = new ArrayList<Function>();
int currentPosition;
int lastPosition = theColors.size() - 1;
// if 5 elements, the penultimate element is 3.
// do not go beyond that, because you always need
// to have a next color when creating the function.
for (currentPosition = 0; currentPosition < lastPosition;
currentPosition++) { // for every consecutive color pair
Color currentColor = theColors.get(currentPosition);
Color nextColor = theColors.get(currentPosition + 1);
// colorspace must be consistent, so we simply convert to sRGB where necessary
if (!currentColor.getColorSpace().isCS_sRGB()) {
//Convert to sRGB
currentColor = ColorUtil.toSRGBColor(currentColor);
theColors.set(currentPosition, currentColor);
}
if (!nextColor.getColorSpace().isCS_sRGB()) {
//Convert to sRGB
nextColor = ColorUtil.toSRGBColor(nextColor);
theColors.set(currentPosition + 1, nextColor);
}
theCzero = toColorVector(currentColor);
theCone = toColorVector(nextColor);
myfunc = makeFunction(2, null, null, theCzero, theCone,
interpolation);
theFunctions.add(myfunc);
} // end of for every consecutive color pair
myfunky = makeFunction(3, null, null, theFunctions, theBounds,
null);
if (radial) {
if (theCoords.size() == 6) {
// make Shading of Type 2 or 3
myShad = makeShading(3, theColorspace, null, null, false, theCoords,
null, myfunky, null);
} else { // if the center x, center y, and radius specifiy
// the gradient, then assume the same center x, center y,
// and radius of zero for the other necessary component
List<Double> newCoords = new ArrayList<Double>();
newCoords.add(theCoords.get(0));
newCoords.add(theCoords.get(1));
newCoords.add(theCoords.get(2));
newCoords.add(theCoords.get(0));
newCoords.add(theCoords.get(1));
newCoords.add(Double.valueOf(0.0));
myShad = makeShading(3, theColorspace, null, null, false, newCoords,
null, myfunky, null);
}
} else {
myShad = makeShading(2, theColorspace, null, null, false, theCoords,
null, myfunky, null);
}
return makePattern(2, myShad, null, null, theMatrix);
}
public abstract Function makeFunction(int functionType, List<Double> theDomain,
List<Double> theRange, List<Function> theFunctions,
List<Double> theBounds, List<Double> theEncode);
public abstract Function makeFunction(int functionType, List<Double> theDomain,
List<Double> theRange, List<Double> theCZero, List<Double> theCOne,
double theInterpolationExponentN);
public abstract Shading makeShading(int theShadingType,
PDFDeviceColorSpace theColorSpace, List<Double> theBackground, List<Double> theBBox,
boolean theAntiAlias, List<Double> theCoords, List<Double> theDomain,
Function theFunction, List<Integer> theExtend);
public abstract Pattern makePattern(int thePatternType, Shading theShading, List theXUID,
StringBuffer theExtGState, List<Double> theMatrix);
private List<Double> toColorVector(Color nextColor) {
List<Double> vector = new java.util.ArrayList<Double>();
float[] comps = nextColor.getColorComponents(null);
for (int i = 0, c = comps.length; i < c; i++) {
vector.add(Double.valueOf(comps[i]));
}
return vector;
}
}
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