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Author: anserwaseem

ex11_3ZoomingInAndOut.pyde

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+''' Rule 30 was introduced by Stephan Wolfram in 1983.
+    This is an extension of Rule 30 with following changes;
+    - Changing 30 to 90
+    - Adding functionality to increase and decrease
+      the value of w using UP and Down key respectively.
+    Change the value of w, rows, cols, and value of w in keyPressed() to explore the design.
+'''
+
+w = 4 #width of each cell
+rows = 400
+cols = 400
+#--snip--
+ruleset = [0,1,0,1,1,0,1,0] #rule 90
+
+def setup():
+    global cells
+    size(600,600)
+    noStroke()
+    #first row:
+    cells = []
+    for r in range(rows):
+        cells.append([])
+        for c in range(cols):
+            cells[r].append(0)
+        cells[0][cols//2] = 1
+    cells = generate()
+
+def draw():
+    background(255) #white
+    #draw the CA
+    for i, cell in enumerate(cells): #rows
+        for j, v in enumerate(cell): #columns
+            if v == 1:
+                fill(0)
+            else:
+                fill(255)
+            rect(j*w-(cols*w-width)/2,w*i,w,w)
+
+#connverting from binary to decimal
+#the indices are in reverse order, so we subtract the total from 7 to get the proper index of the ruleset.
+def rules(a,b,c):
+       return ruleset[7 - (4*a + 2*b + c)]
+
+def generate():
+       for i, row in enumerate(cells): #look at first row
+           for j in range(1,len(row)-1):
+               left = row[j-1]
+               me = row[j]
+               right = row[j+1]
+               if i < len(cells) - 1:
+                    cells[i+1][j] = rules(left,me,right)
+       return cells
+
+def keyPressed():
+    global w
+    if key == CODED:
+        if keyCode == UP:
+            w += 0.1
+        if keyCode == DOWN:
+            w -= 0.1