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22
23 package de.laures.cewolf.util;
24
25 import java.awt.Color  ;
26 import java.awt.Font ;
27 import java.awt.Graphics ;
28 import java.awt.image.BufferedImage ;
29 import java.io.IOException ;
30 import java.io.OutputStream ;
31 import java.io.PrintWriter ;
32 import java.io.StringWriter ;
33 import java.util.Enumeration ;
34 import java.util.StringTokenizer ;
35
36 import com.sun.image.codec.jpeg.JPEGCodec;
37 import com.sun.image.codec.jpeg.JPEGEncodeParam;
38 import com.sun.image.codec.jpeg.JPEGImageEncoder;
39
40
44 public class RenderingHelper {
45
46 private final static int PADDING_X = 5;
47
48 public static String renderMessage(String msg, int width, int height, OutputStream out) throws IOException {
49 BufferedImage image = ImageHelper.createImage(width, height);
50 Graphics gr = image.getGraphics();
51 gr.setColor(Color.white);
52 gr.fillRect(0, 0, width, height);
53 gr.setColor(Color.black);
54 gr.drawString(msg, PADDING_X, height/2 - 7);
55 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
56 JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
57 param.setQuality(1.0f, true);
58 encoder.encode(image, param);
59 return "image/jpeg";
60 }
61
62 public static String renderException(Throwable ex, int width, int height, OutputStream out) throws IOException {
63 BufferedImage image = ImageHelper.createImage(width, height);
64 Graphics gr = image.getGraphics();
65 gr.setColor(Color.white);
66 gr.fillRect(0, 0, width, height);
67 gr.setColor(Color.red);
68 gr.drawString(ex.getClass().getName() + " raised:", PADDING_X, 15);
69 gr.drawString(String.valueOf(ex.getMessage()), PADDING_X, 30);
70 gr.setColor(Color.black);
71 Font stFont = gr.getFont().deriveFont(9f);
72 gr.setFont(stFont);
73 drawStackTrace(gr, PADDING_X, 50, ex);
74 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
75 JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
76 param.setQuality(1.0f, true);
77 encoder.encode(image, param);
78 return "image/jpeg";
79 }
80
81 private static void drawStackTrace(Graphics gr, int x, int y, Throwable ex) {
82 final int linePadding = 4;
83 int lineHeight = gr.getFont().getSize() + linePadding;
84 int currY = y;
85 Enumeration lines = new StringTokenizer (getStackTrace(ex), "\n", false);
86 while (lines.hasMoreElements()) {
87 gr.drawString(((String )lines.nextElement()).trim(), x, currY);
88 currY += lineHeight;
89 }
90 }
91
92 private static String getStackTrace(Throwable t) {
93 StringWriter sw = new StringWriter ();
94 PrintWriter pw = new PrintWriter (sw);
95 t.printStackTrace(pw);
96 pw.close();
97 return sw.getBuffer().toString();
98 }
99
100 }
101 |
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