__main__.PVector instead of Processing.core.PVector

via @GoToLoop suggestion:
https://discourse.processing.org/t/main-pvector-vs-processing-core-pvector/22940

2020/sketch_2020_07_30d/sketch_2020_07_30d.pyde

@@ -15,13 +15,15 @@ def draw():
     image(video, 0, 0)
     stroke(255,0,0); strokeWeight(1)
     opencv.drawOpticalFlow()
-    ave_flow = opencv.getAverageFlow()
-    scale_up = 20
+    ave_flow = PVector().set(opencv.getAverageFlow())
+    ave_flow *= 20
     stroke(255); strokeWeight(3)
     line(video.width / 2,
          video.height / 2,
-         video.width / 2 + ave_flow.x * scale_up,
-         video.height / 2 + ave_flow.y * scale_up)
+         video.width / 2 + ave_flow.x,
+         video.height / 2 + ave_flow.y)
+    print type(ave_flow)
+
     
 def captureEvent(c):
     c.read()