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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.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import org.apache.batik.ext.awt.LinearGradientPaint;
import org.apache.batik.ext.awt.MultipleGradientPaint;
import org.apache.batik.ext.awt.RadialGradientPaint;
import org.apache.xmlgraphics.java2d.color.ColorUtil;
import org.apache.fop.pdf.PDFDeviceColorSpace;
public abstract class GradientFactory<P extends Pattern> {
public P createLinearGradient(LinearGradientPaint gp,
AffineTransform baseTransform, AffineTransform transform) {
Point2D startPoint = gp.getStartPoint();
Point2D endPoint = gp.getEndPoint();
List<Double> coords = new java.util.ArrayList<Double>(4);
coords.add(new Double(startPoint.getX()));
coords.add(new Double(startPoint.getY()));
coords.add(new Double(endPoint.getX()));
coords.add(new Double(endPoint.getY()));
return createGradient(gp, coords, baseTransform, transform);
}
public P createRadialGradient(RadialGradientPaint gradient,
AffineTransform baseTransform, AffineTransform transform) {
double radius = gradient.getRadius();
Point2D center = gradient.getCenterPoint();
Point2D focus = gradient.getFocusPoint();
double dx = focus.getX() - center.getX();
double dy = focus.getY() - center.getY();
double d = Math.sqrt(dx * dx + dy * dy);
if (d > radius) {
// The center point must be within the circle with
// radius radius centered at center so limit it to that.
double scale = (radius * .9999) / d;
dx *= scale;
dy *= scale;
}
List<Double> coords = new java.util.ArrayList<Double>(6);
coords.add(Double.valueOf(center.getX() + dx));
coords.add(Double.valueOf(center.getY() + dy));
coords.add(Double.valueOf(0));
coords.add(Double.valueOf(center.getX()));
coords.add(Double.valueOf(center.getY()));
coords.add(Double.valueOf(radius));
return createGradient(gradient, coords, baseTransform, transform);
}
private P createGradient(MultipleGradientPaint gradient, List<Double> coords,
AffineTransform baseTransform, AffineTransform transform) {
List<Double> matrix = createTransform(gradient, baseTransform, transform);
List<Color> colors = createColors(gradient);
List<Double> bounds = createBounds(gradient);
//Gradients are currently restricted to sRGB
PDFDeviceColorSpace colSpace = new PDFDeviceColorSpace(PDFDeviceColorSpace.DEVICE_RGB);
List<Function> functions = createFunctions(colors);
Function function = makeFunction(3, null, null, functions, bounds, null);
Shading shading = makeShading(gradient instanceof LinearGradientPaint ? 2 : 3,
colSpace, null, null, false, coords, null, function, null);
return makePattern(2, shading, null, null, matrix);
}
private List<Double> createTransform(MultipleGradientPaint gradient,
AffineTransform baseTransform, AffineTransform transform) {
AffineTransform gradientTransform = new AffineTransform(baseTransform);
gradientTransform.concatenate(transform);
gradientTransform.concatenate(gradient.getTransform());
List<Double> matrix = new ArrayList<Double>(6);
double[] m = new double[6];
gradientTransform.getMatrix(m);
for (double d : m) {
matrix.add(Double.valueOf(d));
}
return matrix;
}
private List<Color> createColors(MultipleGradientPaint gradient) {
Color[] svgColors = gradient.getColors();
List<Color> gradientColors = new ArrayList<Color>(svgColors.length + 2);
float[] fractions = gradient.getFractions();
if (fractions[0] > 0f) {
gradientColors.add(getsRGBColor(svgColors[0]));
}
for (Color c : svgColors) {
gradientColors.add(getsRGBColor(c));
}
if (fractions[fractions.length - 1] < 1f) {
gradientColors.add(getsRGBColor(svgColors[svgColors.length - 1]));
}
return gradientColors;
}
private Color getsRGBColor(Color c) {
// Color space must be consistent, so convert to sRGB if necessary
// TODO really?
return c.getColorSpace().isCS_sRGB() ? c : ColorUtil.toSRGBColor(c);
}
private List<Double> createBounds(MultipleGradientPaint gradient) {
// TODO is the conversion to double necessary?
float[] fractions = gradient.getFractions();
List<Double> bounds = new java.util.ArrayList<Double>(fractions.length);
for (float offset : fractions) {
if (0f < offset && offset < 1f) {
bounds.add(Double.valueOf(offset));
}
}
return bounds;
}
private List<Function> createFunctions(List<Color> colors) {
List<Function> functions = new ArrayList<Function>();
for (int currentPosition = 0, lastPosition = colors.size() - 1;
currentPosition < lastPosition;
currentPosition++) {
Color currentColor = colors.get(currentPosition);
Color nextColor = colors.get(currentPosition + 1);
List<Double> c0 = toColorVector(currentColor);
List<Double> c1 = toColorVector(nextColor);
Function function = makeFunction(2, null, null, c0, c1, 1.0);
functions.add(function);
}
return functions;
}
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 P 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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