/* | |
* ==================================================================== | |
* 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; | |
/** | |
* 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: | |
* | |
* <pre> | |
* <code> | |
* 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); | |
* } | |
* } | |
* } | |
* </code> | |
* </pre> | |
* | |
* and then pass this class to your instance of java.awt.Graphics2D: | |
* | |
* <pre> | |
* <code> | |
* graphics.setRenderingHint(Drawable.IMAGE_RENDERER, new MyImageRendener()); | |
* </code> | |
* </pre> | |
*/ | |
public class ImageRenderer { | |
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)); | |
} | |
/** | |
* 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))); | |
} | |
protected static BufferedImage convertBufferedImage(BufferedImage img) { | |
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; | |
} | |
} |