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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.xslf.usermodel;
-
- import java.awt.Graphics2D;
- import java.awt.Insets;
- import java.awt.Shape;
- import java.awt.geom.AffineTransform;
- import java.awt.geom.Rectangle2D;
- import java.awt.image.BufferedImage;
- import java.io.IOException;
-
- import javax.imageio.ImageIO;
-
- import org.apache.poi.openxml4j.opc.PackagePart;
- import org.apache.poi.util.Beta;
-
- /**
- * For now this class renders only images supported by the javax.imageio.ImageIO
- * framework. Subclasses can override this class to support other formats, for
- * example, Use Apache batik to render WMF:
- *
- * <pre>
- * <code>
- * public class MyImageRendener extends XSLFImageRendener{
- * public boolean drawImage(Graphics2D graphics, XSLFPictureData data, Rectangle2D anchor){
- * boolean ok = super.drawImage(graphics, data, anchor);
- * if(!ok){
- * // see what type of image we are
- * String contentType = data.getPackagePart().getContentType();
- * if(contentType.equals("image/wmf")){
- * // use Apache Batik to handle WMF
- * // see http://xmlgraphics.apache.org/batik/
- * }
- *
- * }
- * return ok;
- * }
- * }
- * </code>
- * </pre>
- *
- * and then pass this class to your instance of java.awt.Graphics2D:
- *
- * <pre>
- * <code>
- * graphics.setRenderingHint(XSLFRenderingHint.IMAGE_RENDERER, new MyImageRendener());
- * </code>
- * </pre>
- *
- * @author Yegor Kozlov
- */
- @Beta
- public class XSLFImageRenderer {
-
- /**
- * Render picture data into the supplied graphics
- *
- * @return true if the picture data was successfully rendered
- */
- public boolean drawImage(Graphics2D graphics, XSLFPictureData data,
- Rectangle2D anchor) {
- return drawImage(graphics, data, anchor, null);
- }
-
- /**
- * Render picture data into the supplied graphics
- *
- * @return true if the picture data was successfully rendered
- */
- public boolean drawImage(Graphics2D graphics, XSLFPictureData data,
- Rectangle2D anchor, Insets clip) {
- boolean isClipped = true;
- if (clip == null) {
- isClipped = false;
- clip = new Insets(0,0,0,0);
- }
-
- BufferedImage img;
- try {
- img = ImageIO.read(data.getPackagePart().getInputStream());
- } catch (Exception e) {
- return false;
- }
-
- if(img == null) {
- return false;
- }
-
- int iw = img.getWidth();
- int ih = img.getHeight();
-
- double cw = (100000-clip.left-clip.right) / 100000.0;
- double ch = (100000-clip.top-clip.bottom) / 100000.0;
- double sx = anchor.getWidth()/(iw*cw);
- double sy = anchor.getHeight()/(ih*ch);
- double tx = anchor.getX()-(iw*sx*clip.left/100000.0);
- double ty = anchor.getY()-(ih*sy*clip.top/100000.0);
- AffineTransform at = new AffineTransform(sx, 0, 0, sy, tx, ty) ;
-
- Shape clipOld = graphics.getClip();
- if (isClipped) graphics.clip(anchor.getBounds2D());
- graphics.drawRenderedImage(img, at);
- graphics.setClip(clipOld);
-
- return true;
- }
-
- /**
- * Create a buffered image from the supplied package part.
- * This method is called to create texture paints.
- *
- * @return a <code>BufferedImage</code> containing the decoded
- * contents of the input, or <code>null</code>.
- */
- public BufferedImage readImage(PackagePart packagePart) throws IOException {
- return ImageIO.read(packagePart.getInputStream());
- }
- }
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