From 3008484e5374e08af6892686e0a55cc47af25170 Mon Sep 17 00:00:00 2001
From: Alexandre B A Villares <abav@lugaralgum.com>
Date: Thu, 19 Sep 2019 23:37:23 -0300
Subject: [PATCH] Create sketch_190919a.pyde

---
 2019/sketch_190919a/sketch_190919a.pyde | 108 ++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 2019/sketch_190919a/sketch_190919a.pyde

diff --git a/2019/sketch_190919a/sketch_190919a.pyde b/2019/sketch_190919a/sketch_190919a.pyde
new file mode 100644
index 00000000..1bc6561a
--- /dev/null
+++ b/2019/sketch_190919a/sketch_190919a.pyde
@@ -0,0 +1,108 @@
+cell_size = 10
+from random import choice
+
+clr = 255
+# ngbs_list = ((-1,  0), ( 1,  0),
+#             (-1, -1), ( 0, -1),
+#             ( 1, -1), (-1,  1),
+#             ( 0,  1), ( 0,  0)) 
+ngbs_list = ((-1,  0), ( 1,  0),
+            (-1, -1), ( 0, -1),
+            ( 1, -1), (-1,  1),
+            ( 0,  1), ( 1,  1)) 
+
+def rule(s, v):
+    if v < 2 or v > 3:
+        return 0
+    elif v == 3:
+        return 1
+    else:
+        return s
+
+play = False
+
+def setup():
+    global grid, next_grid, rows, cols
+    size(800, 500)
+    colorMode(HSB)
+    rows = height / cell_size
+    cols = width / cell_size
+    grid = empty_grid()
+    next_grid = empty_grid()
+    noStroke()
+
+def draw():
+    # background(0)
+
+    for i in range(cols):
+        x = i * cell_size
+        for j in range(rows):
+            y  = j * cell_size
+            current_state = grid[i][j]
+            # fill(clr, 255, current_state * 255, 100) # translucent
+        
+            ngbs_alive = calc_ngbs_alive(i, j)
+            result = rule(current_state, ngbs_alive)
+            next_grid[i][j] = result  
+            if current_state:
+                # circle(x, y, cell_size * 2) # overlapping circles
+                fill((clr+ next_grid[i][j]*128)%255, 255, current_state * 255)
+            else:
+                fill(0, 100)
+            square(x, y, cell_size)
+
+    
+    if play:
+        step()
+
+def calc_ngbs_alive(i, j):
+    alive = 0
+    for iv, jv  in ngbs_list:
+        alive += grid[(i + iv) % cols][(j + jv) % rows]
+    return alive
+
+def empty_grid():
+    grid = []
+    for _ in range(cols):
+        grid.append([0] * rows)
+    return grid
+
+def randomize_grid():
+    global clr
+    clr = random(255)
+    for i in range(cols):
+        for j in range(rows):
+            grid[i][j] = choice((0, 1))
+
+def step():
+    global grid, next_grid
+    grid = next_grid
+    next_grid = empty_grid()
+
+def keyPressed():
+    global grid
+    if key == "e":
+        grid = empty_grid()
+    if key == "r":
+        randomize_grid()
+    if key == " ":
+        global play
+        play = not play
+        
+def mouseReleased():
+    invert_on_mouse()
+
+def mouseDragged():    
+    invert_on_mouse()
+    
+def invert_on_mouse():    
+    for i in range(cols):
+        x = i * cell_size
+        for j in range(rows):
+            y  = j * cell_size
+            current_state = grid[i][j]
+            if mouse_over(x, y):
+                grid[i][j] = (1, 0)[current_state]
+                
+def mouse_over(x, y):
+    return x < mouseX < x + cell_size and y < mouseY < y + cell_size