Author: tyrell
Date: Sun Feb 10 06:54:37 2008
New Revision: 13521
Log:
Minor change. Adding internal documentation.
Modified:
trunk/mashup/java/modules/www/captcha.jsp
Modified: trunk/mashup/java/modules/www/captcha.jsp
==============================================================================
--- trunk/mashup/java/modules/www/captcha.jsp (original)
+++ trunk/mashup/java/modules/www/captcha.jsp Sun Feb 10 06:54:37 2008
@@ -29,8 +29,7 @@
response.setContentType("image/" + imageFormat);
try {
- // you can pass in fontSize, width, height via the request
-
+ //It is possible to pass the font size, image width and height with
the request as well
Color backgroundColor = Color.gray;
Color borderColor = Color.black;
Color textColor = Color.white;
@@ -41,8 +40,8 @@
int height = paramInt(request, "height", 80);
int circlesToDraw = 6;
float horizMargin = 20.0f;
- float imageQuality = 0.95f; // max is 1.0 (this is for jpeg)
- double rotationRange = 0.7; // this is radians
+ float imageQuality = 0.95f; // max is 1.0 (for jpeg)
+ double rotationRange = 0.7; // in radians
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
@@ -50,7 +49,7 @@
g.setColor(backgroundColor);
g.fillRect(0, 0, width, height);
- // lets make some noisey circles
+ //Generating some circles for background noise
g.setColor(circleColor);
for (int i = 0; i < circlesToDraw; i++) {
int circleRadius = (int) (Math.random() * height / 2.0);
@@ -66,20 +65,13 @@
int maxAdvance = fontMetrics.getMaxAdvance();
int fontHeight = fontMetrics.getHeight();
- // i removed 1 and l and i because there are confusing to users...
- // Z, z, and N also get confusing when rotated
- // 0, O, and o are also confusing...
- // lowercase G looks a lot like a 9 so i killed it
- // this should ideally be done for every language...
- // i like controlling the characters though because it helps prevent
confusion
+ //We are not using certain characters, which might confuse users
String elegibleChars =
"ABCDEFGHJKLMPQRSTUVWXYabcdefhjkmnpqrstuvwxy23456789";
char[] chars = elegibleChars.toCharArray();
float spaceForLetters = -horizMargin * 2 + width;
float spacePerChar = spaceForLetters / (charsToPrint - 1.0f);
- AffineTransform transform = g.getTransform();
-
StringBuffer finalString = new StringBuffer();
for (int i = 0; i < charsToPrint; i++) {
@@ -90,8 +82,6 @@
// this is a separate canvas used for the character so that
// we can rotate it independently
- int charImageWidth = maxAdvance * 2;
- int charImageHeight = fontHeight * 2;
int charWidth = fontMetrics.charWidth(characterToShow);
int charDim = Math.max(maxAdvance, fontHeight);
int halfCharDim = (int) (charDim / 2);
@@ -119,11 +109,11 @@
charGraphics.dispose();
}
- // let's do the border
+ // Drawing the image border
g.setColor(borderColor);
g.drawRect(0, 0, width - 1, height - 1);
- //Write the image as a jpg
+ // Gnerating the jpg
Iterator iter = ImageIO.getImageWritersByFormatName(imageFormat);
if (iter.hasNext()) {
ImageWriter writer = (ImageWriter) iter.next();
@@ -139,7 +129,7 @@
throw new RuntimeException("no encoder found for jsp");
}
- // let's stick the final string in the session
+ // Storing the string value contained in the image to the session. The
verifier will have to get it from there
request.getSession().setAttribute("captcha", finalString.toString());
g.dispose();
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