【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

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

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<LineRenderer> ();
//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;
}

}