tree.pde

int W = 1024;
int H = 700;
float K1 = 0.4;
float K2 = 0.6;
float LEN_DEC1 = 0.66;
float LEN_DEC2 = 0.5;
float ANGLE1 = PI/6;
float ANGLE2 = -PI/6;
int STEPS = 14;

void setup() {
  size(W, H);
  stroke(255);
  background(0, 0, 0);
  //forkLine(W/2, H-50, 300, PI/2.0, 0);
}

void draw() {
   clear();
   forkLine(W/2, H-50, 400, (2*mouseX-W)/float(W) + PI/2, 0, int((H-mouseY)/64.0));
}
 
void forkLine(float x, float y, float len, float deg, int c, int steps) {
  //if (c >= steps) return;
  if (len < 2) return;
  
  float xd = x - cos(deg) * len;
  float yd = y - sin(deg) * len;
  line(x, y, xd, yd);

  float len1 = len * LEN_DEC1;
  float deg1 = deg - ANGLE1 + (2*mouseX-W)/float(W);
  float x1 = x - cos(deg) * K1 * len;
  float y1 = y - sin(deg) * K1 * len;

  forkLine(x1, y1, len1, deg1, c+1, steps);

  float len2 = len * LEN_DEC2;
  float deg2 = deg - ANGLE2 + (2*mouseX-W)/float(W);
  float x2 = x - cos(deg) * K2 * len;
  float y2 = y - sin(deg) * K2 * len;

  forkLine(x2, y2, len2, deg2, c+1, steps);
   
}