From a692bb65183234a97aba9a572632c8096302ec5b Mon Sep 17 00:00:00 2001
From: Chris Ball <cjb@pullcord.laptop.org>
Date: Sat, 08 Dec 2007 22:26:38 +0000
Subject: Add examples from Henry Holtzman:  bounce, jump, lines, pong.

---
(limited to 'data')

diff --git a/data/graphics/bounce b/data/graphics/bounce
new file mode 100644
index 0000000..94e5c8b
--- /dev/null
+++ b/data/graphics/bounce
@@ -0,0 +1,89 @@
+# bounce: move some text around the screen
+# 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 *
+
+# always need to init first thing
+pygame.init()
+
+# turn off cursor
+pygame.mouse.set_visible(False)
+
+# XO screen is 1200x900
+size = width, height = 1200, 900
+
+# we'll use 36 pixel high text
+fsize = 36
+
+# vector for motion, will control speed and angle
+mvect = [3,2]
+
+# create the window and keep track of the surface
+# for drawing into
+screen = pygame.display.set_mode(size)
+
+msg = "Hello!"
+
+# create a Font object from a file, or use the default
+# font if the file name is None. size param is height
+# in pixels
+
+# usage: pygame.font.Font(filename|object, size)
+font = pygame.font.Font(None, fsize)
+
+# Font.render draws text onto a new surface.
+#
+# usage: Font.render(text, antialias, color, bg=None)
+text = font.render(msg, True, (10,10,10))
+
+# the Rect object is used for positioning
+textRect = text.get_rect()
+
+# start at the top left
+textRect.left = 0;
+textRect.top = 0;
+
+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()
+
+  screen.fill((250,250,250))
+  
+  # draw the text
+  screen.blit(text, textRect)
+
+  # update the display
+  pygame.display.flip()
+
+  # move the text
+  #
+  # Rect.move returns a new Rect while
+  # Rect.move_ip moves in place, so we'll use
+  # the latter
+  textRect.move_ip(mvect)
+
+  # bounce off edges
+  if textRect.left < 0 :
+    textRect.left = 0
+    mvect[0] = -1 * mvect[0]
+  elif textRect.right >= size[0] :
+    textRect.right = size[0] - 1
+    mvect[0] = -1 * mvect[0]
+
+  if textRect.top < 0 :
+    textRect.top = 0
+    mvect[1] = -1 * mvect[1]
+  elif textRect.bottom >= size[1] :
+    textRect.bottom = size[1] - 1
+    mvect[1] = -1 * mvect[1]
diff --git a/data/graphics/image b/data/graphics/image
new file mode 100644
index 0000000..8ee1796
--- /dev/null
+++ b/data/graphics/image
@@ -0,0 +1,52 @@
+# image: take a picture
+#
+# any keypress to exit
+
+import sys, pygame, gst, time
+from random import *
+
+# XO screen is 1200 by 900
+size = width, height = 1200, 900
+
+# grey background
+bgcolor = (128,128,128)
+
+# grab a frame from camera to file
+pipeline = gst.parse_launch('v4l2src ! ffmpegcolorspace ! jpegenc ! filesink location=/tmp/pippypic.jpg')
+pipeline.set_state(gst.STATE_PLAYING)
+
+# pygame always needs to be initialized as the first call
+pygame.init()
+
+# turn off cursor
+pygame.mouse.set_visible(False)
+
+# create the pygame window at the desired size and return a Surface object for
+# drawing in that window.
+screen = pygame.display.set_mode(size)
+
+time.sleep(1)
+pipeline.set_state(gst.STATE_NULL)
+
+# load in previously grabbed frame
+image = pygame.image.load("/tmp/pippypic.jpg")
+
+angle = 0.0
+scale = 2.0
+
+while 1:
+  for event in pygame.event.get():
+    if event.type == pygame.QUIT: sys.exit()
+    elif event.type == pygame.KEYDOWN: sys.exit()
+
+  newImage = pygame.transform.rotozoom(image, angle,scale)
+  newImageRect = newImage.get_rect()
+  newImageRect.centerx = screen.get_rect().centerx
+  newImageRect.centery = screen.get_rect().centery
+
+  screen.fill(bgcolor)
+  screen.blit(newImage, newImageRect)
+  pygame.display.flip()
+
+  angle = angle + 5.0
+  scale = scale * 0.95
diff --git a/data/graphics/jump b/data/graphics/jump
index db7c347..ed08950 100644
--- a/data/graphics/jump
+++ b/data/graphics/jump
@@ -1,14 +1,10 @@
-# From C. Scott Ananian
-# both of these functions should be in the 'basic' package or some such
 def clear_scr():
-    print '\x1B[H\x1B[J' # clear screen, the hard way.
+    print '\x1B[H\x1B[J' # clear screen
+
 def wait():
     import time
     time.sleep(0.1)
 
-# jumping man!
-# having to escape the backslash is rather unfortunate
-# i didn't have to do that in C64 BASIC
 for i in xrange(0,50):
     clear_scr()
     print "\\o/"
@@ -33,4 +29,3 @@ for i in xrange(0,50):
     print " | "
     print "/ \\"
     wait()
-    
diff --git a/data/graphics/lines b/data/graphics/lines
new file mode 100644
index 0000000..1885d61
--- /dev/null
+++ b/data/graphics/lines
@@ -0,0 +1,105 @@
+# 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))
diff --git a/data/graphics/pong b/data/graphics/pong
new file mode 100644
index 0000000..351f7ce
--- /dev/null
+++ b/data/graphics/pong
@@ -0,0 +1,151 @@
+# pong: hit the ball with the paddle
+#
+# 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 *
+
+# 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)
+
+# turn on key repeating (repeat 40 times per second)
+pygame.key.set_repeat(25,25)
+
+# start the screen all black
+bgcolor = (0,0,0)
+screen.fill(bgcolor)
+
+# paddle constants
+paddle_width = 20
+paddle_length = 100
+paddle_radius = paddle_length / 2
+paddle_color = (250,250,250)
+step = 6 # paddle moves 3 pixels at a go
+
+# ball constants
+ball_color = (250,250,250)
+ball_radius = 25
+
+# game constants
+fsize = 48
+msg = "Press 'g' to start game"
+
+font=pygame.font.Font(None, fsize)
+text = font.render(msg, True, (250,250,250))
+textRect = text.get_rect()
+textRect.centerx = screen.get_rect().centerx
+textRect.centery = screen.get_rect().centery
+
+while 1:
+
+  # display msg
+  screen.fill(bgcolor)
+  screen.blit(text, textRect)
+  pygame.display.flip()
+
+  # chill until a key is pressed
+  for idle_event in pygame.event.get():
+    if idle_event.type == QUIT:
+      sys.exit()
+
+    if idle_event.type == KEYDOWN:
+      if idle_event.key == K_ESCAPE:
+        sys.exit()
+
+      if idle_event.key == 103: # g key
+
+        # play a game!
+
+        # start the paddle in the center
+        paddle_location = height / 2
+
+        # number of balls to a game
+        balls = 4
+
+        while balls > 0:
+
+          ball_position = [ball_radius, ball_radius]
+          ball_mvect = [randint(3,5), randint(3,5)]
+          ball_limit = size
+          balls = balls - 1
+
+          while ball_position[0] + ball_radius < ball_limit[0]: # in play
+
+            for event in pygame.event.get():
+              if event.type == QUIT:
+                sys.exit()
+
+              elif event.type == KEYDOWN:
+                if event.key == K_ESCAPE:
+                  sys.exit()
+                elif event.key == 273 \
+                or event.key == 265 \
+                or event.key == 264: # up
+                  paddle_location = paddle_location - step
+                elif event.key == 274 \
+                or event.key == 259 \
+                or event.key == 258: # down
+                  paddle_location = paddle_location + step
+  
+            # make sure the paddle is in-bounds
+            if paddle_location - paddle_radius < 0:
+              paddle_location = paddle_radius
+            elif paddle_location + paddle_radius >= height:
+              paddle_location = height - 1 - paddle_radius
+
+            # clear the screen
+            screen.fill(bgcolor)
+
+            # draw the paddle on the right side of the screen
+            pygame.draw.line(screen,
+  	                     paddle_color,
+                             (width - paddle_width, paddle_location - 
+                              paddle_radius),
+                             (width - paddle_width,
+                              paddle_location+paddle_radius),
+                             paddle_width)
+
+            # draw the ball
+            pygame.draw.circle(screen, ball_color, ball_position, ball_radius)
+
+            # draw the unused balls
+            for i in range(balls):
+              pygame.draw.circle(screen, ball_color, (30+i*ball_radius*2.4, 30), 
+                                 ball_radius)
+
+            # update the display
+            pygame.display.flip()
+
+            # update the ball
+            for i in range(2):
+              ball_position[i] = ball_position[i] + ball_mvect[i]
+
+              # bounce on top and left
+              if ball_position[i] < ball_radius:
+                ball_position[i] = ball_radius
+                ball_mvect[i] = -1 * ball_mvect[i]
+              # bounce on bottom
+              elif i == 1 \
+              and ball_position[i] >= ball_limit[i] - ball_radius:
+                ball_position[i] = ball_limit[i] - ball_radius - 1
+                ball_mvect[i] = -1 * ball_mvect[i]
+              elif i == 0 \
+              and ball_position[i] >= ball_limit[i] - ball_radius - paddle_width \
+              and ball_position[1] > paddle_location - paddle_radius \
+              and ball_position[1] < paddle_location + paddle_radius :
+                ball_position[i] = ball_limit[i] - ball_radius - paddle_width - 1
+                ball_mvect[i] = -1 * ball_mvect[i]
--
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