*) very basic capcha class (see coding sections of forum for more details)

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3541 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/ymage/ymageCapcha.java

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+// ymageCapcha.java
+// -----------------------
+// part of YaCy
+// (C) by Michael Peter Christen; mc@anomic.de
+// first published on http://www.anomic.de
+// Frankfurt, Germany, 2004, 2005
+//
+// $LastChangedDate: 2007-03-24 17:51:19 +0100 (Sa, 24 Mär 2007) $
+// $LastChangedRevision: 3520 $
+// $LastChangedBy: hydrox $
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// Using this software in any meaning (reading, learning, copying, compiling,
+// running) means that you agree that the Author(s) is (are) not responsible
+// for cost, loss of data or any harm that may be caused directly or indirectly
+// by usage of this softare or this documentation. The usage of this software
+// is on your own risk. The installation and usage (starting/running) of this
+// software may allow other people or application to access your computer and
+// any attached devices and is highly dependent on the configuration of the
+// software which must be done by the user of the software; the author(s) is
+// (are) also not responsible for proper configuration and usage of the
+// software, even if provoked by documentation provided together with
+// the software.
+//
+// Any changes to this file according to the GPL as documented in the file
+// gpl.txt aside this file in the shipment you received can be done to the
+// lines that follows this copyright notice here, but changes must not be
+// done inside the copyright notive above. A re-distribution must contain
+// the intact and unchanged copyright notice.
+// Contributions and changes to the program code must be marked as such.
+
+package de.anomic.ymage;
+
+import java.util.Random;
+import javax.imageio.ImageIO;
+
+public class ymageCapcha extends ymageMatrix {
+
+    public ymageCapcha(int width, int height, String code) {
+        super(width, height, SUBTRACTIVE_WHITE);
+        this.create(code);
+    }
+
+    private void create(String code){
+
+        Random random = new Random();
+
+        int width = this.getWidth();
+        int height = this.getHeight();
+        int chars = code.length();
+
+        int x;
+        int y;
+        int ub = 0;
+        int widthPerChar = (int)(width/chars);
+        int pixels = width * height;
+
+
+        //printing code
+        for(int i=0;i<chars;i++){
+            y = random.nextInt((int)(height/2)) + (int)(height/4);
+            setColor(((random.nextInt(128)+64)<<16) + ((random.nextInt(128)+64)<<8) + random.nextInt(128)+64);
+            ymageToolPrint.print(this, widthPerChar*i+random.nextInt((int)(widthPerChar/2)) , y , 0, code.substring(i,i+1), true);
+        }
+
+        //adding some noise
+
+        //random pixels
+        ub = (int)(pixels/100);
+        for(int i=0;i<ub;i++){
+            setColor(((random.nextInt(128)+64)<<16) + ((random.nextInt(128)+64)<<8) + random.nextInt(128)+64);
+            x = random.nextInt(width);
+            y = random.nextInt(height);
+            plot(x, y);
+        }
+
+        //random lines
+        ub = (int)(pixels/1000);
+        for(int i=0;i<ub;i++){
+            setColor(((random.nextInt(128)+64)<<16) + ((random.nextInt(128)+64)<<8) + random.nextInt(128)+64);
+            x = random.nextInt(width);
+            y = random.nextInt(height);
+            line(x, y, x + random.nextInt(5), y + random.nextInt(5));
+        }
+
+    }
+
+    public static void main(String[] args) {
+        // go into headless awt mode
+        System.setProperty("java.awt.headless", "true");
+
+        ymageCapcha m = new ymageCapcha(200, 70, args[1]);
+        try {
+            ImageIO.write(m.getImage(), "png", new java.io.File(args[0]));
+        } catch (java.io.IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+}