113 lines
3.9 KiB
Java
113 lines
3.9 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.xslf.usermodel;
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import org.apache.poi.openxml4j.opc.PackagePart;
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import org.apache.poi.util.Beta;
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import javax.imageio.ImageIO;
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import java.awt.Graphics2D;
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import java.awt.Image;
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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.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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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:
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*
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* <pre>
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* <code>
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* @Override
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* public class MyImageRendener extends XSLFImageRendener{
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* public boolean drawImage(Graphics2D graphics, XSLFPictureData data, Rectangle2D anchor){
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* boolean ok = super.drawImage(graphics, data, anchor);
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* if(!ok){
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* // see what type of image we are
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* String contentType = data.getPackagePart().getContentType();
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* if(contentType.equals("image/wmf")){
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* // use Apache Batik to handle WMF
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* // see http://xmlgraphics.apache.org/batik/
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* }
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*
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* }
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* return ok;
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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(XSLFRenderingHint.IMAGE_RENDERER, new MyImageRendener());
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* </code>
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* </pre>
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*
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* @author Yegor Kozlov
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*/
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@Beta
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public class XSLFImageRendener {
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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 succesfully renderered
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*/
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public boolean drawImage(Graphics2D graphics, XSLFPictureData data,
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Rectangle2D anchor) {
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try {
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BufferedImage img = ImageIO.read(data.getPackagePart().getInputStream());
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Number groupScale = (Number)graphics.getRenderingHint(XSLFRenderingHint.GROUP_SCALE);
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if(groupScale != null) {
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double sx = anchor.getWidth()/img.getWidth();
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double sy = anchor.getHeight()/img.getHeight();
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double tx = anchor.getX();
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double ty = anchor.getY();
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AffineTransform at = new AffineTransform(sx, 0, 0, sy, tx, ty) ;
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graphics.drawRenderedImage(img, at);
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} else {
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graphics.drawImage(img,
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(int) anchor.getX(), (int) anchor.getY(),
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(int) anchor.getWidth(), (int) anchor.getHeight(), null);
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}
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return true;
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} catch (Exception e) {
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return false;
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}
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}
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/**
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* Create a buffered image from the supplied package part.
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* This method is called to create texture paints.
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*
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* @return a <code>BufferedImage</code> containing the decoded
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* contents of the input, or <code>null</code>.
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*/
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public BufferedImage readImage(PackagePart packagePart) throws IOException {
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return ImageIO.read(packagePart.getInputStream());
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}
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} |