Let there be light!

[DustyPorViva]

A little lighting effect I made for single levels. You simply put the code in an NPC in the level or place it in a class and join it, the choice is yours really. You can have more than one light source in a level, but it's not gonna do anything advanced, just merely overlaps(and when played with, you can get some nice looking effects out of it). I use it for just aesthetic reasons, not logical. Like in my screenshot I'm not using it to show light coming from a window, but just to create some nice looking effects.
I should note that even though it does a lot of looping, it only does so when you enter the level and it is not noticeable at all(at least in my experience, and I run on a pretty damn terrible computer, and in my level I'm using two).
Anyways, here's the code, and an image attachment of it in effect:

PHP Code:

//#CLIENTSIDE
function onPlayerenters() {
  // These are tiles that light will 'pass through'... add stuff like vases(that can change 
  // blocking) here. I also have the window tiles in there... so you can have a light source
  // coming from the windows, you might want to remove that
  temp.nonblocking={0x2AC,0x2AD,0x2BC,0x2BD,0x30C,0x30D,0x30E,0x30F,0x31C,0x31D,0x31E,0x31F};
  temp.opacity=.5; // how opaque the shadow will be
  temp.checks=300; // how many checks to perform, careful not to exceed limit loop

  // NOTHING TO EDIT BELOW THIS
  temp.seg=(pi*2)/checks;
  temp.poly={0,0,0,64,64,64,64,0,0,0};

  for (i=0;i<checks+1;i++) {
    for (j=0;j<64;j+=.5) {
      if (onwall(x-sin((i*seg))*j,y-cos((i*seg))*j)) {
        if (!(tiles[x-sin((i*seg))*j,y-cos((i*seg))*j] in nonblocking)) {
          this.newpoly={int((x-sin((i*seg))*j)+.5),int((y-cos((i*seg))*j)+.5)};
          break;
        }
      }
    }
    poly.add(this.newpoly[0]);
    poly.add(this.newpoly[1]);
  }
  poly.add(0);
  poly.add(0);

  showpoly(200,poly);
  changeimgcolors(200,0,0,0,opacity);
  changeimgvis(200,0);
} 


Sorry for the bad screenshot... I don't know how to do a full level screenshot in Graalv5.