1 files changed, 105 insertions, 0 deletions
diff --git a/data/graphics/lines b/data/graphics/lines
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index 0000000..1885d61
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+++ b/data/graphics/lines
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+# lines: make lots of lines on the screen, just for fun!
+# use the escape key to exit
+# 
+# on the XO, the escape key is the top lefthand key,
+# circle with an x in it.
+
+import sys,pygame
+from pygame.locals import *
+from random import *
+
+# XO screen is 1200x900
+size = width, height = 1200, 900
+
+# always need to init first thing
+pygame.init()
+
+# turn off the cursor
+pygame.mouse.set_visible(False)
+
+# create the window and keep track of the surface
+# for drawing into
+screen = pygame.display.set_mode(size)
+# start the screen all black
+screen.fill((0,0,0))
+
+# we need starting endpoints for the line and seed motion vectors
+start=[randint(0,size[0]), randint(0,size[1])]
+end  =[randint(0,size[0]), randint(0,size[1])]
+
+# randomize the motion, 1..3 in each direction, positive or negative, but
+# never 0
+mvect_start = [choice((-1,1)) * randint(1,3), choice((-1,1)) * randint(1,3)]
+mvect_end   = [choice((-1,1)) * randint(1,3), choice((-1,1)) * randint(1,3)]
+
+# start with a random color and color direction
+color = [randint(0,255), randint(0,255), randint(0,255)]
+direction = [choice((-1,1)), choice((-1,1)), choice((-1,1))]
+
+while 1:
+
+  for event in pygame.event.get():
+    if event.type == QUIT:
+      sys.exit()
+
+    elif event.type == KEYDOWN:
+      if event.key == K_ESCAPE:
+        sys.exit()
+
+  # draw the line using the current values and width=3
+  pygame.draw.line(screen, color, start, end, 3)
+
+  # update the display
+  pygame.display.flip()
+
+  # update the end points and the color
+  for i in range(2): 
+    start[i] = start[i] + mvect_start[i]
+    end[i]   = end[i]   + mvect_end[i]
+
+  for i in range(3):
+    color[i] = color[i] + direction[i]
+
+  # check if anything has gone out of range and
+  # if so, bring back to edge and reverse the
+  # corresponding motion vector
+  if start[0] < 0 :
+    start[0] = 0
+    mvect_start[0] = -1 * mvect_start[0]
+  elif start[0] >= size[0] :
+    start[0] = size[0] - 1
+    mvect_start[0] = -1 * mvect_start[0]
+
+  if start[1] < 0 :
+    start[1] = 0
+    mvect_start[1] = -1 * mvect_start[1]
+  elif start[1] >= size[1] :
+    start[1] = size[1] - 1
+    mvect_start[1] = -1 * mvect_start[1]
+
+  if end[0] < 0 :
+    end[0] = 0
+    mvect_end[0] = -1 * mvect_end[0]
+  elif end[0] >= size[0] :
+    end[0] = size[0] - 1
+    mvect_end[0] = -1 * mvect_end[0]
+
+  if end[1] < 0 :
+    end[1] = 0
+    mvect_end[1] = -1 * mvect_end[1]
+  elif end[1] >= size[1] :
+    end[1] = size[1] - 1
+    mvect_end[1] = -1 * mvect_end[1]
+
+  for i in range(3) :
+    if color[i] < 0:
+      color[i] = 0
+      direction[i] = direction[i] * -1
+    elif color[i] >= 255 :
+      color[i] = 255
+      direction[i] = direction[i] * -1
+
+  # randomly change the color directon on occasion
+  if randint(0,511) == 128:
+      for i in range(3):
+         direction[i] = choice((-1,1))