snow-crystal2.pde

void setup() {
  size(500, 500);
  noLoop();
}

void draw() {
  stroke(#ffffff);
  strokeWeight(20);
  snow(width/2, height/2, 0.8 * min(width, height));
}

void cedarLeaf(float len) {
  float unit = len/4;
  float rx = cos(PI/6) * unit;     // == √3/2 * unit
  float ry = sin(PI/6) * unit;     // ==   0.5 * unit
  line(0, 0, 0, len);
  for (int i = 1; i < 4; i++) {
    line(0, i * unit,  rx, i * unit + ry);
    line(0, i * unit, -rx, i * unit + ry); 
  }
}

void snow(float x, float y, float len) {
  pushMatrix();
  translate(x, y);
  for (int i = 0; i < 6; i++) {
    rotate(PI/3);
    cedarLeaf(len / 2);
  }
  popMatrix();
}