UE4 draw a circle with spline

Known variables ： R： The radius of the circle
PointNum： The number of points （ Include initial point ）
StartPoint： The position of the first point
SingleArcLength： The arc length between points
CreateCurrentPointIndex： Index of the current point being created

1. First set the position of the first point , Because the root component is the center of the circle , So just set up X by R

2. After calculating the circumference , Number of passing points , Calculate the arc length between each point

3. Calculate the position of the point to be created by the arc length and the first point

4. Direct formula

effect ：

The equation used ：
x=√(a²+b²)·sin﹛[c/√(a²+b²)]-arcsin[a/√(a²+b²)]﹜
y=√(a²+b²)·cos﹛[c/√(a²+b²)]-arcsin[a/√(a²+b²)]﹜

The more points, the more correct , Number of general points >=5 when , The circle begins to correct