/usr/share/games/slingshot/particle.py is in slingshot 0.9-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Slingshot is a two-dimensional strategy game where two players attempt to shoot one
# another through a section of space populated by planets. The main feature of the
# game is that the shots, once fired, are affected by the gravity of the planets.
# Slingshot is Copyright 2007 Jonathan Musther and Bart Mak. It is released under the
# terms of the GNU General Public License version 2, or later if applicable.
# Slingshot is free software; you can redistribute it and/or modify it under the terms
# of the GNU General Public License as published by the Free Software Foundation; either
# version 2 of the License, or any later version.
# Slingshot is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with Slingshot;
# if not, write to
# the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# Copyright (C) 2009 Marcus Dreier <m-rei@gmx.net>
# Copyright (C) 2010 Ryan Kavanagh <ryanakca@kubuntu.org>
from slingshot.settings import *
from slingshot.general import *
import pygame
import math
from math import sqrt
from random import randint
class Particle(pygame.sprite.Sprite):
def __init__(self, pos = (0.0, 0.0), size = 10):
''' Initialize the particle. '''
pygame.sprite.Sprite.__init__(self)
if size == 5:
self.image = Settings.particle_image5
else:
self.image = Settings.particle_image10
self.rect = self.image.get_rect()
# self.image, self.rect = load_image("explosion-10.png", (0,0,0))
self.pos = pos
self.impact_pos = pos
self.size = size
angle = randint(0, 359)
if size == 5:
speed = randint(Settings.PARTICLE_5_MINSPEED,Settings.PARTICLE_5_MAXSPEED)
else:
speed = randint(Settings.PARTICLE_10_MINSPEED,Settings.PARTICLE_10_MAXSPEED)
# (x velocity, y velocity)
self.v = (0.1 * speed * math.sin(angle), -0.1 * speed * math.cos(angle))
self.flight = Settings.MAX_FLIGHT
def max_flight(self):
if self.flight < 0:
return True
else:
return False
def update(self, planets):
"""
Updates information about ourselves, namely our location.
@param planets: list of planets
@type planets: [Planet]
@return: -1 if we've hit a black hole
0 if we've hit a planet
1 otherwise
@rtype: int
"""
self.flight = self.flight - 1
self.last_pos = self.pos
for p in planets:
p_pos = p.get_pos()
mass = p.get_mass()
dx = self.pos[0] - p_pos[0]
dy = self.pos[1] - p_pos[1]
d = dx**2 + dy**2
# a is the acceleration in pixels/tick
# -> [ G * m_p * \delta d_x G * m_p * \delta d_y ]
# a = [ ---------------------- , ---------------------- ]
# [ r ^ (1/3) r ^ (1/3) ]
try:
a = ((Settings.g * mass * dx) / (d * math.sqrt(d)), (Settings.g * mass * dy) / (d * math.sqrt(d)))
except ZeroDivisionError:
# Hackishly take any silly particles out of the game.
a = (10000, 10000)
# It's been a tick, update our velocity according to our
# acceleration
self.v = (self.v[0] - a[0], self.v[1] - a[1])
self.pos = (self.pos[0] + self.v[0], self.pos[1] + self.v[1])
if not self.in_range():
return 0
for p in planets:
p_pos = p.get_pos()
r = p.get_radius()
# d is not the distance from the planet, it's the distance squared.
d = (self.pos[0] - p_pos[0])**2 + (self.pos[1] - p_pos[1])**2
if p.type == "Blackhole":
min_dist = p.get_mass()
if d <= min_dist:
self.impact_pos = p_pos
self.pos = self.impact_pos
return -1
elif d <= (r)**2:
# This is a planet
self.impact_pos = get_intersect(p_pos, r, self.last_pos, self.pos)
self.pos = self.impact_pos
return 0
if Settings.BOUNCE:
if self.pos[0] > 799:
d = self.pos[0] - self.last_pos[0]
self.pos = (799, self.last_pos[1] + (self.pos[1] - self.last_pos[1]) * (799 - self.last_pos[0]) / d)
self.v = (-self.v[0], self.v[1])
if self.pos[0] < 0:
d = self.last_pos[0] - self.pos[0]
self.pos = (0,self.last_pos[1] + (self.pos[1] - self.last_pos[1]) * self.last_pos[0] / d)
self.v = (-self.v[0], self.v[1])
if self.pos[1] > 599:
d = self.pos[1] - self.last_pos[1]
self.pos = (self.last_pos[0] + (self.pos[0] - self.last_pos[0]) * (599 - self.last_pos[1]) / d, 599)
self.v = (self.v[0], -self.v[1])
if self.pos[1] < 0:
d = self.last_pos[1] - self.pos[1]
self.pos = (self.last_pos[0] + (self.pos[0] - self.last_pos[0]) * self.last_pos[1] / d, 0)
self.v = (self.v[0], -self.v[1])
# print self.pos
# print self.last_pos
self.rect.center = (round(self.pos[0]), round(self.pos[1]))
return 1
def in_range(self):
if pygame.Rect(-800, -600, 2400, 1800).collidepoint(self.pos):
return True
else:
return False
def visible(self):
"""
Returns whether or not the particle is within the playing area.
"""
if pygame.Rect(0, 0, 800, 600).collidepoint(self.pos):
return True
else:
return False
def get_pos(self):
return self.pos
def get_impact_pos(self):
return self.impact_pos
def get_size(self):
return self.size
class Missile(Particle):
def __init__(self, trail_screen):
Particle.__init__(self) #call Sprite intializer
self.image, self.rect = load_image("shot.png", (0,0,0))
self.rect = self.image.get_rect()
self.trail_screen = trail_screen
self.last_pos = (0.0, 0.0)
def launch(self, player):
self.flight = Settings.MAX_FLIGHT
self.pos = player.get_launchpoint()
speed = player.get_power()
angle = math.radians(player.get_angle())
self.v = (0.1 * speed * math.sin(angle), -0.1 * speed * math.cos(angle))
self.trail_color = player.get_color()
self.score = -Settings.PENALTY_FACTOR * speed
def update_players(self, players):
result = 1
for i in xrange(10):
pos = (self.last_pos[0] + i * 0.1 * self.v[0], self.last_pos[1] + i * 0.1 * self.v[1])
if players[1].hit(pos):
result = 0
if players[2].hit(pos):
result = 0
if result == 0:
self.impact_pos = pos
self.pos = pos
break
return result
def draw_status(self, screen):
txt = Settings.font.render("Power penalty: %d" %(-self.score), 1, (255,255,255))
rect = txt.get_rect()
rect.midtop = (399, 5)
screen.blit(txt, rect.topleft)
if self.flight >= 0:
txt = Settings.font.render("Timeout in %d" %(self.flight), 1,(255,255,255))
else:
txt = Settings.font.render("Shot timed out...", 1, (255,255,255))
rect = txt.get_rect()
rect.midbottom = (399, 594)
screen.blit(txt, rect.topleft)
def update(self, planets, players):
result = Particle.update(self, planets)
result = result * self.update_players(players)
# Draws the missile's trajectory only if we haven't entered a black hole.
if result != -1:
pygame.draw.aaline(self.trail_screen, self.trail_color, self.last_pos, self.pos)
return result
def get_image(self):
return self.image
def get_score(self):
return self.score
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