midpointCircle

function scrMidpointCircle(xCentre, yCentre, radius){
	var arr = [];
	var _x = radius, _y = 0;

    array_push(arr, [_x + xCentre, _y + yCentre]);
    if (radius> 0) {
        array_push(arr, [_x + xCentre, -_y + yCentre]);
        array_push(arr, [_y + xCentre, _x + yCentre]);
        array_push(arr, [_y + xCentre, -_x + yCentre]);
        array_push(arr, [-_y + xCentre, _x + yCentre]);
        array_push(arr, [-_x + xCentre, _y + yCentre]);
    }

    var P = 1 - radius;
    while (_x > _y) {
        _y++;
        if (P <= 0)
            P = P + 2 * _y + 1;

        else {
            _x--;
            P = P + 2 * _y - 2 * _x + 1;
        }

        if (_x < _y) {
            break;
		}

        array_push(arr, [_x + xCentre, _y + yCentre]);
        array_push(arr, [-_x + xCentre, _y + yCentre]);
        array_push(arr, [_x + xCentre, -_y + yCentre]);
        array_push(arr, [-_x + xCentre, -_y + yCentre]);
        if (_x != _y) {

            array_push(arr, [_y + xCentre, _x + yCentre]);
            array_push(arr, [-_y + xCentre, _x + yCentre]);
            array_push(arr, [_y + xCentre, -_x + yCentre]);
            array_push(arr, [-_y + xCentre, -_x + yCentre]);
        }
    }

	return arr;
}