193 lines
6.3 KiB
Java
193 lines
6.3 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ====================================================================
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*/
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package org.apache.poi.sl.draw;
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import java.awt.*;
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import java.awt.geom.AffineTransform;
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import java.awt.geom.Rectangle2D;
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import java.awt.image.BufferedImage;
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import java.awt.image.RescaleOp;
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import java.io.*;
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import javax.imageio.ImageIO;
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/**
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* For now this class renders only images supported by the javax.imageio.ImageIO
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* framework. Subclasses can override this class to support other formats, for
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* example, use Apache Batik to render WMF, PICT can be rendered using Apple QuickTime API for Java:
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*
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* <pre>
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* <code>
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* public class MyImageRendener extends ImageRendener {
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* InputStream data;
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*
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* public boolean drawImage(Graphics2D graphics,Rectangle2D anchor,Insets clip) {
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* // draw image
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* DataInputStream is = new DataInputStream(data);
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* org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore wmfStore =
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* new org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore();
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* try {
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* wmfStore.read(is);
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* } catch (IOException e){
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* return;
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* }
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*
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* float scale = (float)anchor.width/wmfStore.getWidthPixels();
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*
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* org.apache.batik.transcoder.wmf.tosvg.WMFPainter painter =
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* new org.apache.batik.transcoder.wmf.tosvg.WMFPainter(wmfStore, 0, 0, scale);
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* graphics.translate(anchor.x, anchor.y);
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* painter.paint(graphics);
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* }
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*
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* public void loadImage(InputStream data, String contentType) throws IOException {
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* if ("image/wmf".equals(contentType)) {
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* this.data = data;
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* // use Apache Batik to handle WMF
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* } else {
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* super.loadImage(data,contentType);
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* }
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* }
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* }
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* </code>
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* </pre>
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*
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* and then pass this class to your instance of java.awt.Graphics2D:
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*
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* <pre>
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* <code>
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* graphics.setRenderingHint(Drawable.IMAGE_RENDERER, new MyImageRendener());
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* </code>
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* </pre>
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*/
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public class ImageRenderer {
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protected BufferedImage img;
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/**
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* Load and buffer the image
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*
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* @param data the raw image stream
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* @param contentType the content type
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*/
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public void loadImage(InputStream data, String contentType) throws IOException {
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img = convertBufferedImage(ImageIO.read(data));
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}
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/**
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* Load and buffer the image
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*
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* @param data the raw image stream
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* @param contentType the content type
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*/
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public void loadImage(byte data[], String contentType) throws IOException {
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img = convertBufferedImage(ImageIO.read(new ByteArrayInputStream(data)));
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}
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protected static BufferedImage convertBufferedImage(BufferedImage img) {
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BufferedImage bi = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
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Graphics g = bi.getGraphics();
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g.drawImage(img, 0, 0, null);
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g.dispose();
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return bi;
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}
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/**
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* @return the buffered image
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*/
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public BufferedImage getImage() {
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return img;
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}
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/**
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* @return the dimension of the buffered image
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*/
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public Dimension getDimension() {
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return (img == null)
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? new Dimension(0,0)
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: new Dimension(img.getWidth(),img.getHeight());
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}
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/**
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* @param alpha the alpha [0..1] to be added to the image (possibly already containing an alpha channel)
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*/
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public void setAlpha(double alpha) {
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if (img == null) return;
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Dimension dim = getDimension();
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BufferedImage newImg = new BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_INT_ARGB);
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Graphics2D g = newImg.createGraphics();
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RescaleOp op = new RescaleOp(new float[]{1.0f, 1.0f, 1.0f, (float)alpha}, new float[]{0,0,0,0}, null);
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g.drawImage(img, op, 0, 0);
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g.dispose();
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img = newImg;
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}
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/**
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* Render picture data into the supplied graphics
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*
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* @return true if the picture data was successfully rendered
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*/
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public boolean drawImage(
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Graphics2D graphics,
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Rectangle2D anchor) {
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return drawImage(graphics, anchor, null);
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}
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/**
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* Render picture data into the supplied graphics
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*
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* @return true if the picture data was successfully rendered
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*/
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public boolean drawImage(
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Graphics2D graphics,
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Rectangle2D anchor,
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Insets clip) {
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if (img == null) return false;
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boolean isClipped = true;
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if (clip == null) {
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isClipped = false;
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clip = new Insets(0,0,0,0);
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}
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int iw = img.getWidth();
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int ih = img.getHeight();
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double cw = (100000-clip.left-clip.right) / 100000.0;
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double ch = (100000-clip.top-clip.bottom) / 100000.0;
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double sx = anchor.getWidth()/(iw*cw);
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double sy = anchor.getHeight()/(ih*ch);
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double tx = anchor.getX()-(iw*sx*clip.left/100000.0);
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double ty = anchor.getY()-(ih*sy*clip.top/100000.0);
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AffineTransform at = new AffineTransform(sx, 0, 0, sy, tx, ty) ;
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Shape clipOld = graphics.getClip();
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if (isClipped) graphics.clip(anchor.getBounds2D());
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graphics.drawRenderedImage(img, at);
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graphics.setClip(clipOld);
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return true;
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}
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}
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