Anuvab Ghosh:
Please give some response about this matter.
Hello Anuvab Ghosh,
Liferay Using simple captcha simplecaptcha.jar , it have only 2 classes for noise in image , so default no way to do
1) nl.captcha.noise.CurvedLineNoiseProducer.class
2) nl.captcha.noise.StraightLineNoiseProducer.class
So you can write your own java class and extend StraightLineNoiseProducer class and then create jar file and copy into tomcat/webapps/root/lib/
I have added sample code ,It may help you ,I have only changed line width to 0.
In portal-ext.properties you have to add your own captcha class.
captcha.engine.simplecaptcha.noise.producers=com.nl.captcha.noise.WithOutAnyNoise
I'm adding sample code for your help
package com.nl.captcha.noise;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.security.SecureRandom;
import nl.captcha.noise.StraightLineNoiseProducer;
public class WithOutAnyNoise extends StraightLineNoiseProducer{
private final Color _color;
private final int _thickness;
private final SecureRandom _gen = new SecureRandom();
/**
* I have changed value from default value 4 to 0, so it will not show any line in captcha
*/
public WithOutAnyNoise() {
this(Color.BLACK, 0);
}
public WithOutAnyNoise(Color color, int thickness) {
_color = color;
_thickness = thickness;
}
public void makeNoise(BufferedImage image) {
Graphics2D graphics = image.createGraphics();
int height = image.getHeight();
int width = image.getWidth();
int y1 = _gen.nextInt(height) + 1;
int y2 = _gen.nextInt(height) + 1;
drawLine(graphics, y1, width, y2);
}
private void drawLine(Graphics g, int y1, int x2, int y2) {
int X1 = 0;
// The thick line is in fact a filled polygon
g.setColor(_color);
int dX = x2 - X1;
int dY = y2 - y1;
// line length
double lineLength = Math.sqrt(dX * dX + dY * dY);
double scale = _thickness / (2 * lineLength);
// The x and y increments from an endpoint needed to create a
// rectangle...
double ddx = -scale * dY;
double ddy = scale * dX;
ddx += (ddx > 0) ? 0.5 : -0.5;
ddy += (ddy > 0) ? 0.5 : -0.5;
int dx = (int) ddx;
int dy = (int) ddy;
// Now we can compute the corner points...
int xPoints[] = new int[4];
int yPoints[] = new int[4];
xPoints[0] = X1 + dx;
yPoints[0] = y1 + dy;
xPoints[1] = X1 - dx;
yPoints[1] = y1 - dy;
xPoints[2] = x2 - dx;
yPoints[2] = y2 - dy;
xPoints[3] = x2 + dx;
yPoints[3] = y2 + dy;
g.fillPolygon(xPoints, yPoints, 4);
}
}
you can use this attached jar as well, you have to only copy below jar into your tomcat/webapss/ROOT/lib folder and add below line into your portal-ext.properites
captcha.engine.simplecaptcha.noise.producers=com.nl.captcha.noise.WithOutAnyNoise
