From 9ebab046878bb95c4eddf5d9e0a4211c21c8948f Mon Sep 17 00:00:00 2001
From: Chris Ball <cjb@laptop.org>
Date: Wed, 21 May 2008 16:51:49 +0000
Subject: Add "tree" and "snow", by Dafydd Harries.

---
(limited to 'data')

diff --git a/data/graphics/snow b/data/graphics/snow
new file mode 100644
index 0000000..4fc30f2
--- /dev/null
+++ b/data/graphics/snow
@@ -0,0 +1,73 @@
+
+import pippy, pygame, sys
+from pygame.locals import *
+from random import *
+
+# always need to init first thing
+pygame.init()
+
+# XO screen is 1200x900
+size = width, height = 1200, 900
+
+# create the window and keep track of the surface
+# for drawing into
+screen = pygame.display.set_mode(size)
+
+# turn off the cursor
+pygame.mouse.set_visible(False)
+
+bg_color = (0,0,0)
+
+xs = []
+ys = []
+dxs = []
+dys = []
+sizes = []
+nflakes = 1000
+
+while pippy.pygame.next_frame():
+  # if we don't have enough flakes, add one
+  if len(xs) < nflakes:
+    xs.append(randint(0, width))
+    ys.append(0)
+    dxs.append(randint(-2, 2))
+    size = expovariate(1) * 5
+    sizes.append(int(size))
+    dys.append(size * 2)
+
+  # clear the screen
+  screen.fill(bg_color)
+
+  for event in pygame.event.get():
+    if event.type == QUIT:
+      sys.exit()
+    elif event.type == KEYDOWN:
+      if event.key == K_ESCAPE:
+        sys.exit()
+
+  for x, y, size in zip(xs, ys, sizes):
+     c = 40 + int(float(y) / height * 215)
+     pygame.draw.circle(
+       screen, (c, c, c), (x, y), size)
+
+  xs_ = []
+  ys_ = []
+  dxs_ = []
+  dys_ = []
+  sizes_ = []
+
+  for x, y, dx, dy, size in zip(xs, ys, dxs, dys, sizes):
+    if 0 <= x + dx <= width and 0 <= y + dy <= height:
+       xs_.append(x + dx)
+       ys_.append(y + int(dy))
+       dxs_.append(dx)
+       dys_.append(dy)
+       sizes_.append(size)
+
+  xs = xs_
+  ys = ys_
+  dxs = dxs_
+  dys = dys_
+  sizes = sizes_
+
+  pygame.display.flip()
diff --git a/data/graphics/tree b/data/graphics/tree
new file mode 100644
index 0000000..ab1c906
--- /dev/null
+++ b/data/graphics/tree
@@ -0,0 +1,71 @@
+
+import pippy, pygame, sys
+from pygame.locals import *
+from random import *
+import math
+
+# always need to init first thing
+pygame.init()
+
+# XO screen is 1200x900
+size = width, height = 1200, 900
+
+# create the window and keep track of the surface
+# for drawing into
+screen = pygame.display.set_mode(size)
+
+# turn off the cursor
+pygame.mouse.set_visible(False)
+
+color = (250,250,250)
+min_factor = 0.8
+max_factor = 0.9
+start_length = 130
+min_length = 40
+min_angle_delta = 0.4
+max_angle_delta = 0.5
+
+# start the screen all black
+bgcolor = (0,0,0)
+screen.fill(bgcolor)
+
+def draw_tree(x, y, length, angle):
+  x2 = x + length * math.sin(angle)
+  y2 = y - length * math.cos(angle)
+  pygame.draw.line(screen, color, (x, y), (x2, y2))
+
+  if length > min_length:
+    # draw left branch
+    left_angle = angle - \\
+      uniform(min_angle_delta, max_angle_delta)
+    left_length = length * \\
+      uniform(min_factor, max_factor)
+    draw_tree(x2, y2, left_length, left_angle)
+    # draw middle branch
+    middle_length = length * \\
+      uniform(min_factor, max_factor)
+    draw_tree(x2, y2, middle_length, angle)
+    # draw right branch
+    right_angle = angle + \\
+      uniform(min_angle_delta, max_angle_delta)
+    right_length = length * \\
+      uniform(min_factor, max_factor)
+    draw_tree(x2, y2, right_length, right_angle)
+
+# clear the screen
+screen.fill(bgcolor)
+
+# draw a tree, starting at the bottom centre of the
+# screen
+draw_tree((width / 2), height - 20, start_length, 0)
+pygame.display.flip()
+
+while pippy.pygame.next_frame():
+  # chill until a key is pressed
+  for event in pygame.event.get():
+    if event.type == QUIT:
+        sys.exit()
+
+    if event.type == KEYDOWN:
+      if event.key == K_ESCAPE:
+        sys.exit()
--
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