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#!/usr/bin/python
"""
This file is part of the 'Bridge' Project
Code: http://git.sugarlabs.org/bridge
git clone git://git.sugarlabs.org/bridge/mainline.git
This file was originally part of the 'Physics' Project
Physics is a 2D Physics Playground for Kids (supporting Box2D2)
Physics Copyright (C) 2008, Alex Levenson, Brian Jordan
Elements Copyright (C) 2008, The Elements Team, <elements@linuxuser.at>
Wiki: http://wiki.laptop.org/wiki/Physics
IRC: #olpc-physics on irc.freenode.org
Code: http://git.sugarlabs.org/physics
git clone git://git.sugarlabs.org/physics/mainline.git
License: GPLv3 http://gplv3.fsf.org/
"""
# Many unused imports, should investigate why
#import sys
#import math
import pygame
from pygame.locals import *
from pygame.color import *
import olpcgames
import elements
#from elements import Elements
import tools
from bridge import Bridge
#from helpers import *
from gettext import gettext as _
class PhysicsGame:
"""
This class is the actual game that runs. It sets up the resources needed to run
and has the loop that handles drawing updates to the screen.
"""
def __init__(self, screen):
"""
The constructor for the class.
"""
# screen is provided from main() below
self.screen = screen
# get everything set up
self.clock = pygame.time.Clock()
self.font = pygame.font.Font(None, 24) # font object
self.canvas = olpcgames.ACTIVITY.canvas # canvas object
self.joystickobject = None # TODO Figure out why this exists
self.debug = True # TODO Figure out what this does.
self.running = False
# create the name --> instance map for components
self.toollist = {}
for tool in tools.ALLTOOLS:
self.toollist[tool.name] = tool(self)
self.currenttool = self.toollist[tools.ALLTOOLS[0].name]
# set up the world (instance of Elements)
self.world = elements.Elements(self.screen.get_size())
self.world.renderer.set_surface(self.screen)
# set up static environment
#self.world.add.ground()
self.world.run_physics = False
self.bridge = Bridge(self)
self.bridge.create_world()
def run(self):
"""This method starts the simulation and provides the loop mechanism.
"""
self.running = True
ticks = pygame.time.get_ticks()
while self.running:
if (pygame.time.get_ticks() - ticks) > 1500:
# bridge.create_train(self)
ticks = pygame.time.get_ticks()
for event in pygame.event.get():
# Handles events like button clicks
self.currenttool.handleEvents(event)
# Clear Display
self.screen.fill((80, 160, 240)) #255 for white
# Update & Draw World
self.world.update()
self.world.draw()
# This is True if the simulation is active, meaning
# the user has requested a train attempt to drive across the bridge.
if self.world.run_physics:
self.bridge.for_each_frame()
# draw output from tools
self.currenttool.draw()
#Print all the text on the screen
# The underscore function will do translations
# to native languages if available.
text = self.font.render(_("Total Cost: %d") % self.bridge.cost,
True, (0, 0, 0))
textpos = text.get_rect(left=100, top=7)
self.screen.blit(text, textpos)
ratio = self.bridge.stress*100/self.bridge.capacity
text = self.font.render(_("Stress: %d%%") % ratio, True, (0, 0, 0))
textpos = text.get_rect(left=100, top=25)
self.screen.blit(text, textpos)
if self.bridge.train_off_screen:
text = self.font.render(
_("Train fell off the screen, press R to try again!"),
True, (0, 0, 0))
elif self.bridge.level_completed:
text = self.font.render(
_("Level completed, well done!! Press T to send another train."),
True, (0, 0, 0))
else:
text = self.font.render(
_("Press the Spacebar to start/pause."),
True, (0, 0, 0))
textpos = text.get_rect(left=100, top=43)
self.screen.blit(text, textpos)
# Flip Display
pygame.display.flip()
# Try to stay at 30 FPS
self.clock.tick(30) # originally 50
def settool(self, tool):
"""Deactivates the previously selected tool, and then sets
the currenttool to be the specified tool.
"""
self.currenttool.cancel()
self.currenttool = self.toolList[tool]
# main() is a function, by itself. It is not in a class.
def main():
"""Runs the activity if the file is ran independently.
See longer comment below.
"""
toolbarheight = 75 # number of pixels
tabheight = 45 # number of pixels
pygame.init()
pygame.display.init()
xsize, ysize = pygame.display.list_modes()[0] # function returns an array
# where the first element [0] is probably the largest resolution.
screen = pygame.display.set_mode((xsize, ysize-toolbarheight-tabheight))
# screen uses the full width, x
# set the screen height less the space needed for the toolbar and tab.
# create an instance of the game
# PhysicsGame is a class (see above in this file)
game = PhysicsGame(screen)
# start the main loop
# This is where the game actually runs. This method is defined in this file.
game.run()
# end of main()
# make sure that main() get's called
# This means that the program was run from the command line as
# python physics.py or ./physics.py or similar.
# if the file was loaded from another .py file using the import keyword
# than main() would not be called.
# This is a handy way to provide a classes and functions to a larger program
# while still performing a smaller action on its own usage.
# Also can be handy for testing code.
if __name__ == '__main__':
main()
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