/**

  * Wallpaper

  * 微信公众号：维度模态

  * 作者：Hewes

  */

 size(800, 800);  //画布尺寸

 background(0);  //背景色

 //相关参数的设定

 //double a = 0.50, b = 2.00, c = 0.00;

 //int mag=60;

 //double a = 0.4, b = 1, c = 0;

 //int mag=100;

 double a = 1, b = 4, c = 60;

 int mag=1;

 //double a = -1, b = -2, c = -3;

 //int mag=5;

 //double a = -1000, b = 0.1, c = -10;

 //int mag=10;

 double x1=0, y1=0, temp;  //涉及变量

 for (int i = 0; i < 2550000; i++) {

   //壁纸公式：

   //xn+1 = yn - sign(xn) | b xn - c |1/2

   //yn+1 = a - xn

   temp = x1;

   x1 = y1 - Math.signum(a * x1) * Math.sqrt(Math.abs(b * x1 - c));

   y1 = a - temp;

   //放大+平移

   int m = (int) (x1 * mag + width/2);

   int n = (int) (y1 * mag + height/2);

   //笔触颜色设置

   stroke(255, i/10000, i/10000);

   //stroke(255-i/10000,255-i/10000, 0);

   point(m, n);

 }