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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.
- ==================================================================== */
-
- package org.apache.poi.sl.draw;
-
- import java.awt.AlphaComposite;
- import java.awt.BasicStroke;
- import java.awt.Color;
- import java.awt.Graphics2D;
- import java.awt.LinearGradientPaint;
- import java.awt.MultipleGradientPaint.ColorSpaceType;
- import java.awt.MultipleGradientPaint.CycleMethod;
- import java.awt.Paint;
- import java.awt.PaintContext;
- import java.awt.Rectangle;
- import java.awt.RenderingHints;
- import java.awt.Shape;
- import java.awt.geom.AffineTransform;
- import java.awt.geom.Area;
- import java.awt.geom.IllegalPathStateException;
- import java.awt.geom.Point2D;
- import java.awt.geom.Rectangle2D;
- import java.awt.image.BufferedImage;
- import java.awt.image.ColorModel;
- import java.awt.image.Raster;
- import java.awt.image.WritableRaster;
-
- import org.apache.poi.util.Internal;
-
- @Internal
- public class PathGradientPaint implements Paint {
-
- // http://asserttrue.blogspot.de/2010/01/how-to-iimplement-custom-paint-in-50.html
- private final Color[] colors;
- private final float[] fractions;
- private final int capStyle;
- private final int joinStyle;
- private final int transparency;
-
-
- PathGradientPaint(float[] fractions, Color[] colors) {
- this(fractions,colors,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
- }
-
- private PathGradientPaint(float[] fractions, Color[] colors, int capStyle, int joinStyle) {
- this.colors = colors.clone();
- this.fractions = fractions.clone();
- this.capStyle = capStyle;
- this.joinStyle = joinStyle;
-
- // determine transparency
- boolean opaque = true;
- for (Color c : colors) {
- if (c != null) {
- opaque = opaque && (c.getAlpha() == 0xff);
- }
- }
- this.transparency = opaque ? OPAQUE : TRANSLUCENT;
- }
-
- @Override
- public PathGradientContext createContext(ColorModel cm,
- Rectangle deviceBounds,
- Rectangle2D userBounds,
- AffineTransform transform,
- RenderingHints hints) {
- return new PathGradientContext(cm, deviceBounds, userBounds, transform, hints);
- }
-
- public int getTransparency() {
- return transparency;
- }
-
- public class PathGradientContext implements PaintContext {
- final Rectangle deviceBounds;
- final Rectangle2D userBounds;
- protected final AffineTransform xform;
- final RenderingHints hints;
-
- /**
- * for POI: the shape will be only known when the subclasses determines the concrete implementation
- * in the draw/-content method, so we need to postpone the setting/creation as long as possible
- **/
- protected final Shape shape;
- final PaintContext pCtx;
- final int gradientSteps;
- WritableRaster raster;
-
- PathGradientContext(
- ColorModel cm
- , Rectangle deviceBounds
- , Rectangle2D userBounds
- , AffineTransform xform
- , RenderingHints hints
- ) {
- shape = (Shape)hints.get(Drawable.GRADIENT_SHAPE);
- if (shape == null) {
- throw new IllegalPathStateException("PathGradientPaint needs a shape to be set via the rendering hint Drawable.GRADIANT_SHAPE.");
- }
-
- this.deviceBounds = deviceBounds;
- this.userBounds = userBounds;
- this.xform = xform;
- this.hints = hints;
-
- gradientSteps = getGradientSteps(shape);
-
- Point2D start = new Point2D.Double(0, 0);
- Point2D end = new Point2D.Double(gradientSteps, 0);
- LinearGradientPaint gradientPaint = new LinearGradientPaint(start, end, fractions, colors, CycleMethod.NO_CYCLE, ColorSpaceType.SRGB, new AffineTransform());
-
- Rectangle bounds = new Rectangle(0, 0, gradientSteps, 1);
- pCtx = gradientPaint.createContext(cm, bounds, bounds, new AffineTransform(), hints);
- }
-
- public void dispose() {}
-
- public ColorModel getColorModel() {
- return pCtx.getColorModel();
- }
-
- public Raster getRaster(int xOffset, int yOffset, int w, int h) {
- ColorModel cm = getColorModel();
- raster = createRaster();
-
- // TODO: eventually use caching here
- WritableRaster childRaster = cm.createCompatibleWritableRaster(w, h);
- Rectangle2D childRect = new Rectangle2D.Double(xOffset, yOffset, w, h);
- if (!childRect.intersects(deviceBounds)) {
- // usually doesn't happen ...
- return childRaster;
- }
-
- Rectangle2D destRect = new Rectangle2D.Double();
- Rectangle2D.intersect(childRect, deviceBounds, destRect);
- int dx = (int)(destRect.getX()-deviceBounds.getX());
- int dy = (int)(destRect.getY()-deviceBounds.getY());
- int dw = (int)destRect.getWidth();
- int dh = (int)destRect.getHeight();
- Object data = raster.getDataElements(dx, dy, dw, dh, null);
- dx = (int)(destRect.getX()-childRect.getX());
- dy = (int)(destRect.getY()-childRect.getY());
- childRaster.setDataElements(dx, dy, dw, dh, data);
-
- return childRaster;
- }
-
- int getGradientSteps(Shape gradientShape) {
- Rectangle rect = gradientShape.getBounds();
- int lower = 1;
- int upper = (int)(Math.max(rect.getWidth(),rect.getHeight())/2.0);
- while (lower < upper-1) {
- int mid = lower + (upper - lower) / 2;
- BasicStroke bs = new BasicStroke(mid, capStyle, joinStyle);
- Area area = new Area(bs.createStrokedShape(gradientShape));
- if (area.isSingular()) {
- upper = mid;
- } else {
- lower = mid;
- }
- }
-
- // always report at least one gradient step
- return Math.max(upper, 1);
- }
-
- public WritableRaster createRaster() {
- if (raster != null) {
- return raster;
- }
-
- ColorModel cm = getColorModel();
- raster = cm.createCompatibleWritableRaster((int)deviceBounds.getWidth(), (int)deviceBounds.getHeight());
- BufferedImage img = new BufferedImage(cm, raster, false, null);
- Graphics2D graphics = img.createGraphics();
- graphics.setRenderingHints(hints);
- graphics.translate(-deviceBounds.getX(), -deviceBounds.getY());
- graphics.transform(xform);
-
- Raster img2 = pCtx.getRaster(0, 0, gradientSteps, 1);
- int[] rgb = new int[cm.getNumComponents()];
-
- for (int i = gradientSteps-1; i>=0; i--) {
- img2.getPixel(gradientSteps-i-1, 0, rgb);
- Color c = new Color(rgb[0],rgb[1],rgb[2]);
- if (rgb.length == 4) {
- // it doesn't work to use just a color with transparency ...
- graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, rgb[3]/255.0f));
- }
- graphics.setStroke(new BasicStroke(i+1F, capStyle, joinStyle));
- graphics.setColor(c);
- if (i == gradientSteps-1) {
- graphics.fill(shape);
- }
- graphics.draw(shape);
- }
-
- graphics.dispose();
- return raster;
- }
- }
- }
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