arc2.pde

void arc2(float x, float y, float s1, float s2, float a1, float a2, int col, float alp1, float alp2) {
  float r1 = s1*0.5;
  float r2 = s2*0.5;
  float amp = (a2-a1);
  float ma = map(amp, 0, TWO_PI, 0, 1);
  int cc = max(2, int(max(r1, r2)*PI*ma));
  float da = amp/cc;
  for (int i = 0; i < cc; i++) {
    float ang = a1+da*i;
    beginShape();
    fill(col, alp1);
    vertex(x+cos(ang)*r1, y+sin(ang)*r1);
    vertex(x+cos(ang+da)*r1, y+sin(ang+da)*r1);
    fill(col, alp2);
    vertex(x+cos(ang+da)*r2, y+sin(ang+da)*r2);
    vertex(x+cos(ang)*r2, y+sin(ang)*r2);
    endShape(CLOSE);
  }
}