package;

import openfl.display.Bitmap;
import openfl.display.BitmapData;
import openfl.display.Sprite;

class Main extends Sprite {
    var bitmap : Bitmap;

    public function new () {
        super ();

        stage.color = 0xFFCCCCCC;

        var bitmapData = new BitmapData(320, 240, true, 0xFF000000);
        bitmap = new Bitmap(bitmapData);
        bitmap.smoothing = false;

        line(1, 1, 320, 240);

        addChild(bitmap);
    }


    function line (fx : Int, fy : Int, x : Int, y : Int) {
        var dx = Std.int(Math.abs(x - fx));
        var dy = Std.int(Math.abs(y - fy));
        var sx = fx < x ? 1 : -1;
        var sy = fy < y ? 1 : -1;

        var error = Std.int((dx > dy ? dx : -dy) / 2);
        var e2 = 0;

        var _x = Std.int(fx);
        var _y = Std.int(fy);

        while(true) {
            if(_x  < 0 || _y < 0 || _x >= bitmap.width || _y >= bitmap.height) {
                break;
            }

            bitmap.bitmapData.setPixel(_x, _y, 0xFFFF0000);

            // We're done
            if(_x == x && _y == y) {
                break;
            }

            e2 = error;

            if(e2 > -dx) {
                error -= dy;
                _x += sx;
            }

            if(e2 < dy) {
                error += dx;
                _y += sy;
            }
        }
    }
}