public static void RotatePoint2(ref Vector2 p, ref Vector2 location, float angle, ref Vector3 o)//a=绝对角度 d=直径
{
int a = (int)(p.x + angle);
if (a < 0)
{
a += 360;
}
if (a > 360)
{
a -= 360;
}
float d = p.y;
o.x = location.x - MathH.Sin(a) * d;
o.y = location.y + MathH.Cos(a) * d;
}
public static Vector2[] RotatePoint2(ref Vector2[] P, Vector2 location, float angle)//p[].x=绝对角度 p[].y=直径
{
Vector2[] temp = new Vector2[P.Length];
for (int i = 0; i < P.Length; i++)
{
int a = (int)(P[i].x + angle);//change angle to radin
if (a < 0)
{
a += 360;
}
if (a >= 360)
{
a -= 360;
}
temp[i].x = location.x - MathH.Sin(a) * P[i].y;
temp[i].y = location.y + MathH.Cos(a) * P[i].y;
}
return(temp);
}
public static Vector3 RotateVector3(Vector2 p, ref Vector3 location, float angle)//a=绝对角度 d=直径
{
int a = (int)(p.x + angle);
if (a < 0)
{
a += 360;
}
if (a > 360)
{
a -= 360;
}
float d = p.y;
Vector3 temp = location;
temp.x = location.x - MathH.Sin(a) * d;
temp.y = location.y + MathH.Cos(a) * d;
return(temp);
}
/// <summary>
/// 创建一个圆锥，返回顶点和三角形
/// </summary>
/// <param name="r">半径</param>
/// <param name="h">高度</param>
/// <param name="arc">三角形弧度，越小精度越高，范围0-360取整</param>
/// <returns>顶点，三角形</returns>
public static ConeData CreateCone(float r, float h, float arc)
{
int a = (int)arc;
int c = 360 / a;
int vc = c + 2;
Vector3[] vertex = new Vector3[vc];
int[] tri = new int[c * 6];
int o = c;
int s = 0;
int i = 0;
for (; i < c; i++)
{
vertex[i].x = -MathH.Sin(s) * r;
vertex[i].z = MathH.Cos(s) * r;
tri[i * 3] = i + 1;
tri[i * 3 + 1] = c;
tri[i * 3 + 2] = i;
tri[o * 3] = i;
tri[o * 3 + 1] = c + 1;
tri[o * 3 + 2] = i + 1;
o++;
s += a;
}
i--;
o--;
vertex[c + 1].y = h;
tri[i * 3] = 0;
tri[o * 3 + 2] = 0;
ConeData cd = new ConeData();
cd.Vertex = vertex;
cd.Tri = tri;
return(cd);
}
