【Unity3d】如何绘制椭圆

今天偶然看到一篇关于如何画椭圆的帖子 随即就整理了下

	/// 

	/// 首先绘制椭圆的公式
	/// 椭圆的参数方程x=acosθ,y=bsinθ；
	/// 

	public Transform trans;
	public float w;//椭圆长
	public float h; //椭圆高
	public int angle = 360;
	[Range(0,360)]
	public int speed = 0;
	private Vector3[] vec;
	private int index = 0;
	private LineRenderer line;

	float x, y;

	void Start()
	{
		

		vec = new Vector3[angle];

		for (int i = 0; i < angle; i++)
		{
			// Mathf.Deg2Rad 单位角度的弧 相当于 1° 的弧度
			x = w * Mathf.Cos(i * Mathf.Deg2Rad);

			y = h * Mathf.Sin(i * Mathf.Deg2Rad);

			vec [i] = trans.position + new Vector3 (x,0,y);

		}

		SetLine ();
	}

	void SetLine()
	{
		line = gameObject.AddComponent ();
		//设置线由多少个点构成
		line.SetVertexCount (angle);
		//绘制点的坐标
		line.SetPositions (vec);
	}


	void Update()
	{
		trans.position = vec [index];

		if ((index += speed) >= vec.Length)
		{
			index = 0;
		}

	}