private void DrawOneLine(AirPort start, AirPort end)
{
LineRenderer lineRender;
if (_lines.ContainsKey(end.GetHashCode()))
{
lineRender = _lines[end.GetHashCode()];
}
else
{
lineRender = new GameObject("linerender").AddComponent <LineRenderer>();
lineRender.transform.parent = obj;
_lines[end.GetHashCode()] = lineRender;
lineRender.startWidth = 0.05f;
lineRender.endWidth = 0.05f;
lineRender.material = new Material(Shader.Find("Legacy Shaders/Particles/Additive"));
lineRender.receiveShadows = false;
lineRender.shadowCastingMode = ShadowCastingMode.Off;
lineRender.startColor = Color.yellow;
lineRender.endColor = Color.yellow;
}
float angle = Vector3.Angle(start.position, end.position);
float k = 1f; //角度太大曲线会穿过地球。
if (angle <= 60)
{
k = 1.1f;
}
else if (angle > 60 && angle < 120)
{
k = 1.3f;
}
else if (angle >= 120 && angle < 160)
{
k = 1.5f;
}
else if (angle >= 160)
{
k = 1.8f;
}
//确定bezier中间的两个点， 曲线不能太直会穿过地面，也不能太弯会不美观，所以用 k 调整一下。
Vector3 p1 = Quaternion.AngleAxis(angle * 0.3f, Vector3.Cross(start.position, end.position)) * start.position * k;
Vector3 p2 = Quaternion.AngleAxis(-angle * 0.3f, Vector3.Cross(start.position, end.position)) * end.position * k;
lineRender.positionCount = 100;
for (int i = 1; i <= 100; i++)
{
//参数的取值范围 0 - 1 返回曲线没一点的位置
//为了精确这里使用i * 0.01 得到当前点的坐标
Vector3 vec = Bezier.Bezier_3(start.position, p1, p2, end.position, (float)(i * 0.01));
//把每条线段绘制出来 完成白塞尔曲线的绘制
lineRender.SetPosition(i - 1, vec);
}
}