function draw_arc(_x, _y, _r, _as, _at, _th = 1, _pr = 32) {
	var ox, oy, nx, ny;
	var ast = 360 / _pr;
	var sgn = sign(_at - _as);
	var ar  = abs(_at - _as) / 360 * _pr;
	
	for( var i = 0; i < ar; i++ ) {
		var a = _as + ast * i * sgn;
		
		nx = _x + lengthdir_x(_r, a);
		ny = _y + lengthdir_y(_r, a);
		
		if(i) draw_line_round(ox, oy, nx, ny, _th);
		
		ox = nx;
		oy = ny;
	}
}

function draw_arc_fast(_x, _y, _r, _as, _at, _th = 1, _pr = 8) {
	var ox, oy, nx, ny;
	var ast = 360 / _pr;
	var sgn = sign(_at - _as);
	var ar  = abs(_at - _as) / 360 * _pr;
	
	for( var i = 0; i < ar; i++ ) {
		var a = _as + ast * i * sgn;
		
		nx = _x + lengthdir_x(_r, a);
		ny = _y + lengthdir_y(_r, a);
		
		if(i) draw_line(ox, oy, nx, ny);
		
		ox = nx;
		oy = ny;
	}
}