def random_spot_away_from_hero(hero, mindist = 20.0):
"""Calculate a random spot that is at least mindist away from the hero."""
dist = 0.0
# We use a brute-force: while we have not found a good point, choose a random
# point and calculate its distance. Rinse and repeat until a good point is found.
while dist < mindist:
x, y = random(WIDTH), random(HEIGHT)
dist = distance(x, y, hero.x, hero.y)
return x, y
def update(self, hero, blobs):
# Increase and decrease the size based on the speed of the blob
self.size = abs(sin(self.seed+FRAME/(5.0-self.speed*2.0)) * 2.0+self.seed) + 4.0
# This code implements the chase behaviour of the blobs.
# First, calculate the angle between ourselves and the hero
self.angle = angle(self.x, self.y, hero.x, hero.y)
# Then, move in that direction using the moving speed
self.x, self.y = coordinates(self.x, self.y, self.speed, self.angle)
# Calculate if I'm not bumping into another blob. If I am, calculate a new
# jump to an empty spot on the board.
for blob in blobs:
if blob is not self and abs(distance(self.x, self.y, blob.x, blob.y)) < blob.size*2:
self.x, self.y = random_spot_away_from_hero(hero)
def draw():
global hero, blobs, gameover, starttime, endtime
# To make things a little more interesting, we rotate and scale the canvas while
# the game is running. For this to work, we need corner-mode transformations.
transform(CORNER)
# Move to the middle of the screen to set the rotation. This makes sure the rotation
# isn't applied from a corner, but from the middle of the screen.
translate(WIDTH/2, HEIGHT/2)
# The rotation amount and speed is linked to the current FRAME. The farther in the game,
# the faster and bigger the rotation gets
rotate(sin(FRAME/70.0)*FRAME/10.0)
# The speed of the saling is also linked to the current FRAME.
scale(0.6 + abs(sin(FRAME/100.0)*0.4))
# Move the canvas back. The rotation is now applied.
translate(-WIDTH/2, -HEIGHT/2)
# Draw a rectangle, defining the playing field
stroke(0)
nofill()
rect(0,0,WIDTH,HEIGHT-STATUS_BAR_HEIGHT)
nostroke()
# The following functions apply when the game is not over,
# in other words when we are still playing.
if not gameover:
# Check the keys and move the hero accordingly.
# The min and max lines keep the hero within the bounds
# of the playing field
if keydown:
if keycode == KEY_UP:
hero.y -= hero.speed
hero.y = max(hero.size, hero.y)
if keycode == KEY_DOWN:
hero.y += hero.speed
hero.y = min(WIDTH-hero.size, hero.y)
if keycode == KEY_LEFT:
hero.x -= hero.speed
hero.x = max(hero.size, hero.x)
if keycode == KEY_RIGHT:
hero.x += hero.speed
hero.x = min(WIDTH-hero.size, hero.x)
# Update the blobs. This part is the actual "intelligence" of the game.
# This routine also calculates if one of the blobs hits your hero, in
# which case the game is over.
for blob in blobs:
blob.update(hero, blobs)
if abs(distance(hero.x, hero.y, blob.x, blob.y)) < blob.size + hero.size:
gameover = True
# The endtime stores how long we survived.
endtime = time.time()
# Draw everything. This is done even when the game is over.
hero.draw()
for blob in blobs:
blob.draw()
# The status indicators are drawn on-screen without all the funky rotations
# and scaling. Reset the canvas.
reset()
# The time to display is either the endtime (on gameover), or the current time.
if endtime is not None:
t = endtime - starttime
else:
t = time.time()-starttime
# Draw the time
fontsize(12)
fill(0,0.6)
rect(0,HEIGHT-STATUS_BAR_HEIGHT, WIDTH, STATUS_BAR_HEIGHT)
fill(1)
text("%.2f seconds" % t, 5, HEIGHT-2)
# If the game is over, scale up the hero to get a black screen
# and draw the "GAME OVER" message
if gameover:
if hero.size < 500:
hero.size += 30.0
fill(1)
text("GAME OVER", (WIDTH/2.0)-textwidth("game over")/2.0, HEIGHT/2)
