actionscript-3 - 什么是围绕一个点定位 8 个圆圈的优雅方式

Question

var circles:Array = new Array();


for(var i:int = 0; i < 8; i++)
{

    var ball:Ball = new Ball();
        ball.x = ???
        ball.y = ???
        circles.push(ball);
}

将球定位在某个点周围的最佳方法是什么，比如彼此相距 5-10 的距离，有什么公式吗？

Answer 1

for(var i:int = 0; i < 8; i++)
{
    var ball:Ball = new Ball();

    // Point has a useful static function for this, it takes two parameters
    // First, length, in other words how far from the center we want to be
    // Second, it wants the angle in radians, a complete circle is 2 * Math.PI
    // So, we're multiplying that with (i / 8) to place them equally far apart
    var pos:Point = Point.polar(50, (i / 8) * Math.PI * 2);

    // Finally, set the position of the ball
    ball.x = pos.x;
    ball.y = pos.y;

    circles.push(ball);
}