数学基础知识之Sin、cos画圆

void DrawCircle()
{
float x = obj.transform.localPosition.x;
float y = obj.transform.localPosition.y;

float radir = 200;
for (int i = 0; i < 90; i++)
{
//第一象限
Vector3 vc = Vector3.zero;
vc.x = x + radir * Mathf.Cos(Mathf.PI / 180 * i);
vc.y = y + radir * Mathf.Sin(Mathf.PI / 180 * i);
GameObject tmpObj = Instantiate(obj.gameObject);
tmpObj.transform.parent = obj.transform.parent;
tmpObj.transform.localPosition = vc;
tmpObj.transform.localScale = Vector3.one;
//第四象限
vc.y = y - radir * Mathf.Sin(Mathf.PI / 180 * i);
tmpObj = Instantiate(obj.gameObject);
tmpObj.transform.parent = obj.transform.parent;
tmpObj.transform.localPosition = vc;
tmpObj.transform.localScale = Vector3.one;
//第二象限
vc = Vector3.zero;
vc.x = x - radir * Mathf.Cos(Mathf.PI / 180 * i);
vc.y = y + radir * Mathf.Sin(Mathf.PI / 180 * i);
tmpObj = Instantiate(obj.gameObject);
tmpObj.transform.parent = obj.transform.parent;
tmpObj.transform.localPosition = vc;
tmpObj.transform.localScale = Vector3.one;

//第三象限
vc.y = y - radir * Mathf.Sin(Mathf.PI / 180 * i);
tmpObj = Instantiate(obj.gameObject);
tmpObj.transform.parent = obj.transform.parent;
tmpObj.transform.localPosition = vc;
tmpObj.transform.localScale = Vector3.one;

}

}