add distance calculation of points for future improved interpolation

render.py

     p_max = [points[0][0], points[0][1]]
 
     # find center
+    dist_min = float('inf')
+    dist_max = 0
+    p_prev = p_min
     for segment in path:
         p = [segment.end.real, segment.end.imag]
         for i in range(0, 2):
             if p[i] > p_max[i]:
                 p_max[i] = p[i]
 
+        dist_curr  = (p[0] - p_prev[0]) * (p[0] - p_prev[0])
+        dist_curr += (p[1] - p_prev[1]) * (p[1] - p_prev[1])
+        dist_curr  = math.sqrt(dist_curr)
+        p_prev = p
+        if dist_curr > dist_max:
+            dist_max = dist_curr
+        if dist_curr < dist_min:
+            dist_min = dist_curr
+
     p_center = [ p_min[0] + (p_max[0] - p_min[0] )/2  ,  p_min[1] + (p_max[1] - p_min[1] )/2]
 
     # find min max for all rotatations
 
     print("min={} max={}".format(p_min, p_max))
     print("center={} ".format(p_center))
+    print("dist ={} ={} ".format(dist_min, dist_max))
 
     data = bytearray()