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serial_n_scan.py

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+#-------------------------------------------------------------------------------
+# Name:        serial n scan
+#
+# Purpose:      1.To scan a image n divide into least possible number of lines
+#               2.Send required commands in the serial port(maybe, 2 will be better) as tuples
+#                 (permitted values are -1,0,1 for both wheels)
+#
+# Author:      bendtherules
+#
+# Created:     21-12-2012
+#-------------------------------------------------------------------------------
+
+import pygame
+from pygame.locals import *
+pygame.init();
+milli_start=pygame.time.get_ticks()
+surf=pygame.display.set_mode((1,1));
+img=pygame.image.load("a.png").convert_alpha();
+pygame.Surface.lock(img);
+arr_3d=pygame.surfarray.pixels3d(img);
+arr_2d=pygame.surfarray.pixels_alpha(img);
+pygame.Surface.unlock(img);
+#loop here
+start_x=start_y=None;
+all_lists=[];
+count_list=0;
+counted=[[False]*arr_2d]*arr_2d[0];#used as an array of the same dimensions as arr_2d to know whether it has been scanned
+for x in range(len(arr_2d)):
+    for y in range(len(arr_2d[0])):
+        if arr_2d[x][y]>=128:
+            arr_2d[x][y]=255;
+            if start_x==None:
+                start_x=x;
+                start_y=y;
+                counted[x][y]=True;
+        else:
+            arr_2d[x][y]=0;
+def scan(start_x=start_x,start_y=start_y,new=True):
+    #new should be true when it is a new line or new sub-line
+    #start_x and start_y needs to be passed in this recursive function in later recursion calls
+    #Default values are passed to make the function friendlier, but they should be overridden in later calls
+    global arr_2d;
+    global counted;
+    global count_list;
+    global all_lists;
+    if new==True:
+        temp_list=[];
+    for count_x in (-1,0,1):
+        for count_y in (-1,0,1):
+            if arr_2d[x+count_x][y+count_y]==255 and counted[x][y]==False:
+                #counted[x][y] check eliminated the (start_x,start_y) pixel
+                counted[x+count_x][y+count_y]=True;
+                all_lists.append((x+count_x,y+count_y))
+
+#the end
+milli_end=pygame.time.get_ticks()
+print(milli_end-milli_start);