 false;	var snap_to_f_down = false;

	function all_not_over() {
		linear_scale_over = false;
		atan_scale_over = false;
		scale_dec_over = false;
		scale_inc_over = false;
		reset_xy_over = false;
		reset_scale_over = false;
		snap_to_f_over = false;
	}

	function all_not_down() {
		linear_scale_down = false;
		atan_scale_down = false;
		scale_dec_down = false;
		scale_inc_down = false;
		reset_xy_down = false;
		reset_scale_down = false;
		snap_to_f_down = false;
	}

	function linear_real_to_screen (x, dx,