Prevent grabcut, houghcircles and houghlines python2 demos from running automatically while browsing demos in the demo list viewer

samples/python2/houghlines.py

@@ -9,35 +9,37 @@ import numpy as np
 import sys
 import math
 
-try:
-    fn = sys.argv[1]
-except:
-    fn = "../data/pic1.png"
-print __doc__
-src = cv2.imread(fn)
-dst = cv2.Canny(src, 50, 200)
-cdst = cv2.cvtColor(dst, cv2.COLOR_GRAY2BGR)
+if __name__ == '__main__':
 
-if True: # HoughLinesP
-    lines = cv2.HoughLinesP(dst, 1, math.pi/180.0, 40, np.array([]), 50, 10)
-    a,b,c = lines.shape
-    for i in range(a):
-        cv2.line(cdst, (lines[i][0][0], lines[i][0][1]), (lines[i][0][2], lines[i][0][3]), (0, 0, 255), 3, cv2.LINE_AA)
+    try:
+        fn = sys.argv[1]
+    except:
+        fn = "../data/pic1.png"
+    print __doc__
+    src = cv2.imread(fn)
+    dst = cv2.Canny(src, 50, 200)
+    cdst = cv2.cvtColor(dst, cv2.COLOR_GRAY2BGR)
 
-else:    # HoughLines
-    lines = cv2.HoughLines(dst, 1, math.pi/180.0, 50, np.array([]), 0, 0)
-    a,b,c = lines.shape
-    for i in range(a):
-        rho = lines[i][0][0]
-        theta = lines[i][0][1]
-        a = math.cos(theta)
-        b = math.sin(theta)
-        x0, y0 = a*rho, b*rho
-        pt1 = ( int(x0+1000*(-b)), int(y0+1000*(a)) )
-        pt2 = ( int(x0-1000*(-b)), int(y0-1000*(a)) )
-        cv2.line(cdst, pt1, pt2, (0, 0, 255), 3, cv2.LINE_AA)
+    if True: # HoughLinesP
+        lines = cv2.HoughLinesP(dst, 1, math.pi/180.0, 40, np.array([]), 50, 10)
+        a,b,c = lines.shape
+        for i in range(a):
+            cv2.line(cdst, (lines[i][0][0], lines[i][0][1]), (lines[i][0][2], lines[i][0][3]), (0, 0, 255), 3, cv2.LINE_AA)
+
+    else:    # HoughLines
+        lines = cv2.HoughLines(dst, 1, math.pi/180.0, 50, np.array([]), 0, 0)
+        a,b,c = lines.shape
+        for i in range(a):
+            rho = lines[i][0][0]
+            theta = lines[i][0][1]
+            a = math.cos(theta)
+            b = math.sin(theta)
+            x0, y0 = a*rho, b*rho
+            pt1 = ( int(x0+1000*(-b)), int(y0+1000*(a)) )
+            pt2 = ( int(x0-1000*(-b)), int(y0-1000*(a)) )
+            cv2.line(cdst, pt1, pt2, (0, 0, 255), 3, cv2.LINE_AA)
 
 
-cv2.imshow("source", src)
-cv2.imshow("detected lines", cdst)
-cv2.waitKey(0)
+    cv2.imshow("source", src)
+    cv2.imshow("detected lines", cdst)
+    cv2.waitKey(0)