def step(self, scrollPosition): #tight physics v_step = 0.5 v_target = 6.0 # max. speed relative to screen # translate movement boundary self.boundsRect.y = scrollPosition # determine speed def towards(current,expected): if abs(expected-current) < v_step: return expected if current > expected: return current - v_step return current + v_step # continue to determine speed if self.DOWN and not self.UP: self.v_y = towards(self.v_y,v_target-constants.SCROLL_RATE) elif self.UP and not self.DOWN: self.v_y = towards(self.v_y,-v_target-constants.SCROLL_RATE) elif not self.UP and not self.DOWN: self.v_y = towards(self.v_y,-constants.SCROLL_RATE) if self.LEFT and not self.RIGHT: self.v_x = towards(self.v_x,-v_target-constants.SCROLL_RATE) elif self.RIGHT and not self.LEFT: self.v_x = towards(self.v_x,v_target-constants.SCROLL_RATE) elif not self.LEFT and not self.RIGHT: self.v_x = towards(self.v_x,0) # update position PhysicalObject.step(self, scrollPosition) #hard bounds fix if self.physicsRect.x + self.physicsRect.width > self.boundsRect.x + self.boundsRect.width: self.setX(self.boundsRect.x + self.boundsRect.width - self.physicsRect.width) if self.r_x < self.boundsRect.x: self.setX(self.boundsRect.x) if self.r_y + self.physicsRect.height > self.boundsRect.y + self.boundsRect.height: self.setY(self.boundsRect.y + self.boundsRect.height - self.physicsRect.height) if self.r_y < self.boundsRect.y: self.setY(self.boundsRect.y) #update image if 0 < self.v_x < (v_target / 2.0): self.action = "right-center" elif (v_target / 2.0) <= self.v_x <= v_target: self.action = "right" elif self.v_x==0: self.action = "center" elif -(v_target / 2.0) < self.v_x < 0: self.action = "left-center" elif -(v_target) < self.v_x < -(v_target/2.0): self.action = "left" self.area = pygame.rect.Rect(self.actions[self.action]) # update weapon if self.timeUntilWeaponCanFireAgain > 0: self.timeUntilWeaponCanFireAgain -= 1
def step(self, scrollPosition):
# translate movement boundary
self.boundsRect.y = scrollPosition
# update self
PhysicalObject.step(self, scrollPosition)
if self.timeLeftToCharge < (1 / 5.0) * GUN_CHARGEUP_TIME:
self.action = "charged 100"
elif self.timeLeftToCharge < (3 / 5.0) * GUN_CHARGEUP_TIME:
self.action = "charged 50"
else:
self.action = "charged 0"
self.area = pygame.rect.Rect(self.actions[self.action])
if self.physicsRect.colliderect(self.boundsRect):
turretSeesShip = False
target = None
for o in self.level.physicalObjects:
if (
o.controllingPlayer == physical_object.OWNER_ATTACKER
and o.targetType == physical_object.TARGET_TYPE_SHIP
):
turretSeesShip = True
target = o
if turretSeesShip:
self.timeLeftToCharge -= 1
if self.timeLeftToCharge <= 0:
# it's the ship! get it!
soundEfx = pygame.mixer.Sound(constants.TURRET_BULLET_SFX)
soundEfx.set_volume(0.5)
play_sound.PlaySounds(soundEfx, 2)
theBullet = bullet.Bullet(
(
self.rect.x + TURRET_WIDTH / 2 - bullet.BULLET_WIDTH / 2,
self.rect.y + (bullet.BULLET_HEIGHT + 6),
),
"tur",
)
theBullet.controllingPlayer = self.controllingPlayer
# old velocity code
# deltaX = o.r_x - self.r_x
# deltaY = o.r_y - self.r_y
# distance = math.hypot(deltaX, deltaY)
# theBullet.v_x = bullet.DEFAULT_SPEED*(deltaX/distance) # v_x = speed*cos
# theBullet.v_y = bullet.DEFAULT_SPEED*(deltaY/distance) # v_y = speed*sin
# new velocity code; apparently tries to divide by zero and take the square root of a negative number
# timeToImpact = ((o.r_x*o.v_x + o.r_y*o.v_y + math.sqrt(-pow(o.r_y,2)*(-1 + pow(o.v_x, 2)) + o.r_x*(o.r_x + 2*o.r_y*o.v_x*o.v_y - o.r_x*pow(o.v_y, 2))))/(-1 + pow(o.v_x, 2) + pow(o.v_y, 2)))
# theBullet.v_x = (o.r_x + timeToImpact*o.v_x)/timeToImpact
# theBullet.v_y = (o.r_y + timeToImpact*o.v_y)/timeToImpact
# new velocity code, mk. II
futurepos = (
target.r_x,
target.r_y,
) # Guess that where they'll be in the future is where they are now
MY_SPEED = 1.5 + constants.SCROLL_RATE
for i in range(0, 4):
dist = (futurepos[0] - self.r_x, futurepos[1] - self.r_y)
timetotarget = math.hypot(dist[0], dist[1]) / bullet.DEFAULT_SPEED
distcovered = (target.v_x * timetotarget, target.v_y * timetotarget)
futurepos = (target.r_x + distcovered[0], target.r_y + distcovered[1])
dirNotNormalized = (futurepos[0] - self.r_x, futurepos[1] - self.r_y)
dirNormalized = (
dirNotNormalized[0] / math.hypot(dirNotNormalized[0], dirNotNormalized[1]),
dirNotNormalized[1] / math.hypot(dirNotNormalized[0], dirNotNormalized[1]),
)
theBullet.v_x = MY_SPEED * dirNormalized[0]
theBullet.v_y = MY_SPEED * dirNormalized[1]
# end of velocity code
self.childObjects.append(theBullet)
self.timeLeftToCharge = GUN_CHARGEUP_TIME
else: # if the turret doesn't see the ship,
self.timeLeftToCharge = GUN_CHARGEUP_TIME # then the turret should power down
def step(self, scrollPosition): PhysicalObject.step(self, scrollPosition) self.timeToLive -= 1 if(self.timeToLive <= 0): self.destroyed = True;
