/*
* Copyright (c) 2009 Piotr Piastucki
*
* This file is part of Patchca CAPTCHA library.
*
* Patchca 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 3 of the License, or
* (at your option) any later version.
*
* Patchca 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 Patchca. If not, see <http://www.gnu.org/licenses/>.
*/
package com.xiongyingqi.captcha.filter.library;
public class MarbleImageOp extends AbstractTransformImageOp {
double scale;
double amount;
double turbulence;
double[] tx;
double[] ty;
double randomX;
double randomY;
public MarbleImageOp() {
scale = 15;
amount = 1.1;
turbulence = 6.2;
randomX = 256 * Math.random();
randomY = 256 * Math.random();
}
public double getScale() {
return scale;
}
public void setScale(double scale) {
this.scale = scale;
}
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
public double getTurbulence() {
return turbulence;
}
public void setTurbulence(double turbulence) {
this.turbulence = turbulence;
}
@Override
protected synchronized void init() {
tx = new double[256];
ty = new double[256];
for (int i = 0; i < 256; i++) {
double angle = 2 * Math.PI * i * turbulence / 256;
tx[i] = amount * Math.sin(angle);
ty[i] = amount * Math.cos(angle);
}
}
@Override
protected void transform(int x, int y, double[] t) {
int d = limitByte((int) (127 * (1 + PerlinNoise.noise2D(((double) x) / scale + randomX, ((double) y) / scale + randomY))));
t[0] = x + tx[d];
t[1] = y + ty[d];
}
protected void filter2(int[] inPixels, int[] outPixels, int width, int height) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int pixel = limitByte((int) (127 * (1 + PerlinNoise.noise2D(((double) x) / scale + randomX, ((double) y) / scale + randomY))));
outPixels[x + y * width] = (limitByte((int) 255) << 24) | (limitByte((int) pixel) << 16) | (limitByte((int) pixel) << 8) | (limitByte((int) pixel));
}
}
}
}