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This OSGi bundle wraps poi, poi-contrib, poi-ooxml, poi-ooxml-schemas and poi-scratchpad ${pkgVersion} jar files.
/*
* ====================================================================
* 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.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import java.io.*;
import javax.imageio.ImageIO;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
/**
* 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, PICT can be rendered using Apple QuickTime API for Java:
*
*
*
* public class MyImageRendener extends ImageRendener {
* InputStream data;
*
* public boolean drawImage(Graphics2D graphics,Rectangle2D anchor,Insets clip) {
* // draw image
* DataInputStream is = new DataInputStream(data);
* org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore wmfStore =
* new org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore();
* try {
* wmfStore.read(is);
* } catch (IOException e){
* return;
* }
*
* float scale = (float)anchor.width/wmfStore.getWidthPixels();
*
* org.apache.batik.transcoder.wmf.tosvg.WMFPainter painter =
* new org.apache.batik.transcoder.wmf.tosvg.WMFPainter(wmfStore, 0, 0, scale);
* graphics.translate(anchor.x, anchor.y);
* painter.paint(graphics);
* }
*
* public void loadImage(InputStream data, String contentType) throws IOException {
* if ("image/wmf".equals(contentType)) {
* this.data = data;
* // use Apache Batik to handle WMF
* } else {
* super.loadImage(data,contentType);
* }
* }
* }
*
*
*
* and then pass this class to your instance of java.awt.Graphics2D:
*
*
*
* graphics.setRenderingHint(Drawable.IMAGE_RENDERER, new MyImageRendener());
*
*
*/
public class ImageRenderer {
private final static POILogger LOG = POILogFactory.getLogger(ImageRenderer.class);
protected BufferedImage img;
/**
* Load and buffer the image
*
* @param data the raw image stream
* @param contentType the content type
*/
public void loadImage(InputStream data, String contentType) throws IOException {
img = convertBufferedImage(ImageIO.read(data), contentType);
}
/**
* Load and buffer the image
*
* @param data the raw image stream
* @param contentType the content type
*/
public void loadImage(byte data[], String contentType) throws IOException {
img = convertBufferedImage(ImageIO.read(new ByteArrayInputStream(data)), contentType);
}
/**
* Add alpha channel to buffered image
*/
private static BufferedImage convertBufferedImage(BufferedImage img, String contentType) {
if (img == null) {
LOG.log(POILogger.WARN, "Content-type: "+contentType+" is not support. Image ignored.");
return null;
}
BufferedImage bi = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics g = bi.getGraphics();
g.drawImage(img, 0, 0, null);
g.dispose();
return bi;
}
/**
* @return the buffered image
*/
public BufferedImage getImage() {
return img;
}
/**
* @return the dimension of the buffered image
*/
public Dimension getDimension() {
return (img == null)
? new Dimension(0,0)
: new Dimension(img.getWidth(),img.getHeight());
}
/**
* @param alpha the alpha [0..1] to be added to the image (possibly already containing an alpha channel)
*/
public void setAlpha(double alpha) {
if (img == null) return;
Dimension dim = getDimension();
BufferedImage newImg = new BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g = newImg.createGraphics();
RescaleOp op = new RescaleOp(new float[]{1.0f, 1.0f, 1.0f, (float)alpha}, new float[]{0,0,0,0}, null);
g.drawImage(img, op, 0, 0);
g.dispose();
img = newImg;
}
/**
* Render picture data into the supplied graphics
*
* @return true if the picture data was successfully rendered
*/
public boolean drawImage(
Graphics2D graphics,
Rectangle2D anchor) {
return drawImage(graphics, anchor, null);
}
/**
* Render picture data into the supplied graphics
*
* @return true if the picture data was successfully rendered
*/
public boolean drawImage(
Graphics2D graphics,
Rectangle2D anchor,
Insets clip) {
if (img == null) return false;
boolean isClipped = true;
if (clip == null) {
isClipped = false;
clip = new Insets(0,0,0,0);
}
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;
}
}