def activeMovement(self, sprite, action, speed=None):
""" Here the assumption is that the controls determine the direction of
acceleration of the sprite. """
if speed is None:
speed = sprite.speed
v1 = action[0] / float(sprite.mass) + sprite.orientation[0] * speed
v2 = action[1] / float(sprite.mass) + sprite.orientation[1] * speed
sprite.orientation = unitVector((v1, v2))
sprite.speed = vectNorm((v1, v2)) / vectNorm(sprite.orientation)
def activeMovement(self, sprite, action, speed=None):
""" Here the assumption is that the controls determine the direction of
acceleration of the sprite. """
if speed is None:
speed = sprite.speed
v1 = action[0] / float(sprite.mass) + sprite.orientation[0] * speed
v2 = action[1] / float(sprite.mass) + sprite.orientation[1] * speed
sprite.orientation = unitVector((v1, v2))
sprite.speed = vectNorm((v1, v2)) / vectNorm(sprite.orientation)
def killIfSlow(sprite, partner, game, limitspeed=1):
""" Take a decision based on relative speed. """
if sprite.is_static:
relspeed = partner.speed
elif partner.is_static:
relspeed = sprite.speed
else:
relspeed = vectNorm((sprite._velocity()[0] - partner._velocity()[0],
sprite._velocity()[1] - partner._velocity()[1]))
if relspeed < limitspeed:
killSprite(sprite, partner, game)
def killIfSlow(sprite, partner, game, limitspeed=1):
""" Take a decision based on relative speed. """
if sprite.is_static:
relspeed = partner.speed
elif partner.is_static:
relspeed = sprite.speed
else:
relspeed = vectNorm((sprite._velocity()[0] - partner._velocity()[0],
sprite._velocity()[1] - partner._velocity()[1]))
if relspeed < limitspeed:
killSprite(sprite, partner, game)
def wallStop(sprite, partner, game, friction=0):
""" Stop just in front of the wall, removing that velocity component,
but possibly sliding along it. """
if not oncePerStep(sprite, game, 'laststop'):
return
stepBack(sprite, partner, game)
if abs(sprite.rect.centerx - partner.rect.centerx) > abs(sprite.rect.centery - partner.rect.centery):
sprite.orientation = (0, sprite.orientation[1] * (1. - friction))
else:
sprite.orientation = (sprite.orientation[0] * (1. - friction), 0)
sprite.speed = vectNorm(sprite.orientation) * sprite.speed
sprite.orientation = unitVector(sprite.orientation)
def wallStop(sprite, partner, game, friction=0):
""" Stop just in front of the wall, removing that velocity component,
but possibly sliding along it. """
if not oncePerStep(sprite, game, 'laststop'):
return
stepBack(sprite, partner, game)
if abs(sprite.rect.centerx -
partner.rect.centerx) > abs(sprite.rect.centery -
partner.rect.centery):
sprite.orientation = (0, sprite.orientation[1] * (1. - friction))
else:
sprite.orientation = (sprite.orientation[0] * (1. - friction), 0)
sprite.speed = vectNorm(sprite.orientation) * sprite.speed
sprite.orientation = unitVector(sprite.orientation)