makescreenshot2() selection.

[Emera]

I'm trying to code a selection tool for using makescreenshot2(), so I don't have to keep using snipping tool to make images of tiles. I've got an idea of what needs to be done, but I'm not 100% sure if I'm getting the maths right.

Basically, the player left clicks to set the x and y and then they right click to find the difference between the first click and the last click, the script does the maths and takes a screen shot of the selected tiles, or that's what it's supposed to do.

Attached below are the results of the script so far, and they're close to what I want, but obviously it's not working.

PHP Code:

//#CLIENTSIDE

function onCreated() {
  setTimer(0.05);
  !this.capture;
  client.capturedata = {0,0,0,0};
}

function onKeyPressed(code,Key) {
  if (Key == "H") {
    this.capture = !this.capture;
  }
}  

function onTimeout() {
  if (this.capture) {
    with(findimg(200)) {
      temp.poly = {
        int(mousex), int(mousey),
        int(mousex) + 1, int(mousey),
        int(mousex) + 1, int(mousey) + 1,
        int(mousex), int(mousey) + 1
      };
      showpoly(200, temp.poly);
    }
  } else {
    hideimg(200);
  }
  setTimer(0.05);
}

function onMouseDown(mode) {
  if (mode == "left" && this.capture) {
    client.capturedata[0] = int(mousex);
    client.capturedata[1] = int(mousey);
    
    player.chat = client.capturedata;
  }
  
  if (mode == "right" && this.capture) {
    temp.distancex = client.capturedata[0] - int(mousex);
    temp.distancey = client.capturedata[1] - int(mousey);

    client.capturedata[2] = client.capturedata[0] + temp.distancex;
    client.capturedata[3] = client.capturedata[1] + temp.distancey;

    makescreenshot2("leveltest.png", 0x3f, client.capturedata[0], client.capturedata[1], player.z, client.capturedata[2], client.capturedata[3]);
    player.chat = client.capturedata;
  }
} 


Could somebody help me out?