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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.gradient;
-
- 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 final class GradientMaker {
-
- public interface DoubleFormatter {
-
- String formatDouble(double d);
- }
-
- private GradientMaker() { }
-
- public static Pattern makeLinearGradient(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(Double.valueOf(startPoint.getX()));
- coords.add(Double.valueOf(startPoint.getY()));
- coords.add(Double.valueOf(endPoint.getX()));
- coords.add(Double.valueOf(endPoint.getY()));
- return makeGradient(gp, coords, baseTransform, transform);
- }
-
- public static Pattern makeRadialGradient(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 makeGradient(gradient, coords, baseTransform, transform);
- }
-
- private static Pattern makeGradient(MultipleGradientPaint gradient, List<Double> coords,
- AffineTransform baseTransform, AffineTransform transform) {
- List<Double> matrix = makeTransform(gradient, baseTransform, transform);
- List<Float> bounds = makeBounds(gradient);
- List<Function> functions = makeFunctions(gradient);
- // Gradients are currently restricted to sRGB
- PDFDeviceColorSpace colorSpace = new PDFDeviceColorSpace(PDFDeviceColorSpace.DEVICE_RGB);
- Function function = new Function(null, null, functions, bounds, null);
- int shadingType = gradient instanceof LinearGradientPaint ? 2 : 3;
- Shading shading = new Shading(shadingType, colorSpace, coords, function);
- return new Pattern(2, shading, matrix);
- }
-
- private static List<Double> makeTransform(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 static 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 static List<Float> makeBounds(MultipleGradientPaint gradient) {
- float[] fractions = gradient.getFractions();
- List<Float> bounds = new java.util.ArrayList<Float>(fractions.length);
- for (float offset : fractions) {
- if (0f < offset && offset < 1f) {
- bounds.add(offset);
- }
- }
- return bounds;
- }
-
- private static List<Function> makeFunctions(MultipleGradientPaint gradient) {
- List<Color> colors = makeColors(gradient);
- 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);
- float[] c0 = currentColor.getColorComponents(null);
- float[] c1 = nextColor.getColorComponents(null);
- Function function = new Function(null, null, c0, c1, 1.0);
- functions.add(function);
- }
- return functions;
- }
-
- private static List<Color> makeColors(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;
- }
-
- static void outputDoubles(StringBuilder out, DoubleFormatter doubleFormatter,
- List<? extends Number> numbers) {
- out.append("[ ");
- for (Number n : numbers) {
- out.append(doubleFormatter.formatDouble(n.doubleValue()));
- out.append(" ");
- }
- out.append("]");
- }
-
- }
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