//This transparent point function is also from Jared Tarbell (complexification.net)

void tpoint(int x1, int y1, color myc, float a) {
  if ((x1>=0) && (x1<width) && (y1>=0) && (y1<height)) {
    if (a>=1.0) {
      stroke(myc);
      point(x1,y1);
    } else {
      int r, g, b;
      color c;

      c = get(x1, y1);

      r = int(red(c) + (red(myc) - red(c)) * a);
      g = int(green(c) +(green(myc) - green(c)) * a);
      b = int(blue(c) + (blue(myc) - blue(c)) * a);
      color nc = color(r, g, b);
      stroke(nc);
      point(x1,y1);
    }
  }
}

//Here's my transparent streak function. 
void tstreak(int x, int y, float a, float l, color c) {
    float xx = x;
    float yy = y;
    float alph = 0.2;
    for (int i=0; i< l * 5; i++) {
     tpoint(int(xx), int(yy), c, alph);
     a += 0.0001 * (i * i);
     alph *= 0.96;
     xx += sin(a) * 1.2;
     yy += cos(a) * 1.2;
    };
};