?? renderinghelper.java
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/* ================================================================
* Cewolf : Chart enabling Web Objects Framework
* ================================================================
*
* Project Info: http://cewolf.sourceforge.net
* Project Lead: Guido Laures (guido@laures.de);
*
* (C) Copyright 2002, by Guido Laures
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
package de.laures.cewolf.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Enumeration;
import java.util.StringTokenizer;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* Some methods to render messages or exceptions into an image.
* @author glaures
*/
public class RenderingHelper {
private final static int PADDING_X = 5;
public static String renderMessage(String msg, int width, int height, OutputStream out) throws IOException {
BufferedImage image = ImageHelper.createImage(width, height);
Graphics gr = image.getGraphics();
gr.setColor(Color.white);
gr.fillRect(0, 0, width, height);
gr.setColor(Color.black);
gr.drawString(msg, PADDING_X, height/2 - 7);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
param.setQuality(1.0f, true);
encoder.encode(image, param);
return "image/jpeg";
}
public static String renderException(Throwable ex, int width, int height, OutputStream out) throws IOException {
BufferedImage image = ImageHelper.createImage(width, height);
Graphics gr = image.getGraphics();
gr.setColor(Color.white);
gr.fillRect(0, 0, width, height);
gr.setColor(Color.red);
gr.drawString(ex.getClass().getName() + " raised:", PADDING_X, 15);
gr.drawString(String.valueOf(ex.getMessage()), PADDING_X, 30);
gr.setColor(Color.black);
Font stFont = gr.getFont().deriveFont(9f);
gr.setFont(stFont);
drawStackTrace(gr, PADDING_X, 50, ex);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
param.setQuality(1.0f, true);
encoder.encode(image, param);
return "image/jpeg";
}
private static void drawStackTrace(Graphics gr, int x, int y, Throwable ex) {
final int linePadding = 4;
int lineHeight = gr.getFont().getSize() + linePadding;
int currY = y;
Enumeration lines = new StringTokenizer(getStackTrace(ex), "\n", false);
while (lines.hasMoreElements()) {
gr.drawString(((String)lines.nextElement()).trim(), x, currY);
currY += lineHeight;
}
}
private static String getStackTrace(Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
t.printStackTrace(pw);
pw.close();
return sw.getBuffer().toString();
}
}
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