optimize section fw/bw by row

python/hit_return_evaluation.py

@@ -72,10 +72,10 @@ class HitReturnEval:
     #  | |     | | | |   | | | | | |
     #  1-2     1-2 1-2   1-2 1-2 1-2
 
-    m=0
-    x0,y0,n=0,-1,0   # counter well in region
+    r=0             #row
+    x0,y0,n=0,-1,0  # counter well in region
     dx,dy=0,1       # motion pitch
-    x1,y1=0,0      #counter region start
+    x1,y1=0,0       #counter region start
     mv=list()
     while(True):
       x0+=dx;y0+=dy
@@ -94,10 +94,12 @@ class HitReturnEval:
           dx,dy=0,1 #(4)
       elif y0==0:
         if n==1 and x0==1: #(7 or 8)
-          if x1+2*sx<=nx:#(7)
+          if r%2==0 and x1+2*sx<=nx:#(7 even)
             x1+=sx
+          elif r%2==1 and x1>0:#(7 odd)
+            x1-=sx
           elif y1+2*sy<=ny:#(8)
-            x1=0;y1+=sy
+            y1+=sy;r+=1
           else:
             break #finished whole grid
           print('next regionA')