Okay, so I\'m supposed to write a program that draws out the Julia set in cool c

Question

Okay, so I'm supposed to write a program that draws out the Julia set in cool colors from a mouse click using stddraw. The first problem that I am running into, is I can't get the mouse click to pick up the x and y coordinates and the second problem is I can't get the colors to work but I am positive that my math is correct. Here is what I have so far, I hope you can help. This program requires Complex.java located here http://introcs.cs.princeton.edu/java/32class/Complex.java.html and the standard input/output libraries here http://introcs.cs.princeton.edu/java/stdlib/. Hope this helps!

import java.awt.Color;
public class ColorJulia {
static int julia(Complex c, Complex z, int max) {
for (int t = 0; t < max; t++) {
if (z.abs() > 2.0) return t;
z = z.times(z).plus(c);
}
return max - 1;
}

public static void main(String[] args) {
StdDraw.setCanvasSize(512,512);
StdDraw.setXscale(-2,2);
StdDraw.setYscale(-2,2);
double real = StdDraw.mouseX();
double imag = StdDraw.mouseY();
System.out.println(real+","+imag);
Complex c = new Complex((double) real, (double) imag);
double xmin = -2.0;
double ymin = -2.0;
double width = 4.0;
double height = 4.0;
int N = 512;
int max = 256;
StdDraw.setPenRadius(0.01);
StdDraw.show(0);
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
double x = xmin + i * width / N;
double y = ymin + j * height / N;
Complex a = new Complex(y, x);
Complex z = new Complex(x, y);
int r = julia(a,z,max);
int g = julia(z,a,max);
int b = julia(a,a,max);
Color[] colors = new Color(r,g,b);
StdDraw.setPenColor(colors);
StdDraw.point(x, y);
}
}
StdDraw.show(0);
}

}

Explanation / Answer

If your colors aren't working, you need to make sure that your jawa.awt.color file is not corrupt and will show up properly. Otherwise, your math looks correct.

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