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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.
*/
/* $Id: ImageViewer.java 750418 2009-03-05 11:03:54Z vhennebert $ */
package image.loader;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.IOException;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageManager;
import org.apache.xmlgraphics.image.loader.ImageSessionContext;
import org.apache.xmlgraphics.image.loader.ImageSize;
import org.apache.xmlgraphics.image.loader.impl.DefaultImageContext;
import org.apache.xmlgraphics.image.loader.impl.DefaultImageSessionContext;
import org.apache.xmlgraphics.image.loader.impl.ImageGraphics2D;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
/**
* Very simple image viewer application that demonstrates the use of the image loader framework.
*/
public class ImageViewer {
private ImageManager imageManager;
public ImageViewer() {
//The ImageManager is set up for the whole application
this.imageManager = new ImageManager(new DefaultImageContext());
}
public void display(File f) throws IOException {
//The ImageSessionContext might for each processing run
ImageSessionContext sessionContext = new DefaultImageSessionContext(
this.imageManager.getImageContext(), null);
//Construct URI from filename
String uri = f.toURI().toASCIIString();
ImageGraphics2D g2dImage = null;
try {
//Preload image
ImageInfo info = this.imageManager.getImageInfo(uri, sessionContext);
//Load image and request Graphics2D image
g2dImage = (ImageGraphics2D)this.imageManager.getImage(
info, ImageFlavor.GRAPHICS2D, sessionContext);
} catch (ImageException e) {
e.printStackTrace();
//Create "error image" if the image cannot be displayed
g2dImage = createErrorImage();
}
//Display frame with image
ViewerFrame frame = new ViewerFrame(g2dImage);
frame.setVisible(true);
}
private ImageGraphics2D createErrorImage() {
Graphics2DImagePainter painter = new Graphics2DImagePainter() {
public Dimension getImageSize() {
return new Dimension(10, 10);
}
public void paint(Graphics2D g2d, Rectangle2D area) {
g2d.translate(area.getX(), area.getY());
double w = area.getWidth();
double h = area.getHeight();
//Fit in paint area
Dimension imageSize = getImageSize();
double sx = w / imageSize.getWidth();
double sy = h / imageSize.getHeight();
if (sx != 1.0 || sy != 1.0) {
g2d.scale(sx, sy);
}
g2d.setColor(Color.RED);
g2d.setStroke(new BasicStroke(0));
g2d.drawRect(0, 0, imageSize.width, imageSize.height);
g2d.drawLine(0, 0, imageSize.width, imageSize.height);
g2d.drawLine(0, imageSize.height, imageSize.width, 0);
}
};
Dimension dim = painter.getImageSize();
ImageSize size = new ImageSize();
size.setSizeInMillipoints(dim.width, dim.height);
size.setResolution(imageManager.getImageContext().getSourceResolution());
size.calcPixelsFromSize();
ImageInfo info = new ImageInfo(null, null);
info.setSize(size);
return new ImageGraphics2D(info, painter);
}
/**
* The application's main method.
* @param args the command-line arguments
*/
public static void main(String[] args) {
try {
ImageViewer app = new ImageViewer();
if (args.length < 1) {
throw new IllegalArgumentException("No filename given as application argument");
}
app.display(new File(args[0]));
} catch (Throwable t) {
t.printStackTrace();
System.exit(-1);
}
}
}
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