Design Patterns

Command.py

'''
This is my implementation of the Command design pattern.
It decouples simple actions into a "Command" class that is
inherited by FireCommand, etc. 

Written in python for simplicity sake.

For more info >> http://gameprogrammingpatterns.com/command.html
'''

class Command:
	def execute(self, actor):
		pass

class FireCommand(Command):
	def execute(self, actor):
		actor.fire()

class JumpCommand(Command):
	def execute(self, actor):
		actor.jump()

class YellCommand(Command):
	def execute(self, actor):
		actor.yell()

class GameActor():
	def __init__(self, name=None, hp=100):
		self.name , self.hp = name , hp

	def fire(self):
		print "Pew pew pew!"
	
	def jump(self):
		print "I jumped!"

	def yell(self):
		print "I AM "+str(self.name)+"!"

#Setup our command handlers
fire = FireCommand()
jump = JumpCommand()
yell = YellCommand()

#Make a game actor object
actor = GameActor("Tom", 200)


#Fire off some commands to an actor
fire.execute(actor)
jump.execute(actor)
yell.execute(actor)

'''
Output:

Pew pew pew!
I jumped!
I AM Tom!

'''

Flyweight.py

'''
Flyweight. A design pattern used solely for efficiency with
large arrays of nearly indentical objects. 

A simple world generator 

Written in python for simplicity sake.

For more info >> http://gameprogrammingpatterns.com/command.html
'''
from random import *

class World:
	def __init__(self, width, height):
		self.grass = Terrain(1, False, "grass.png")
		self.hill  = Terrain(3, False, "hill.png")
		self.water = Terrain(2, True, "water.png")

		self.WIDTH, self.HEIGHT = width, height
		self.grid = [[None for i in range(height)] for j in range(width)]

	def __str__(self):
		output = ""
		for x in xrange(0, self.WIDTH):
			for y in xrange(0, self.HEIGHT):
				output+= "["+str(self.grid[x][y].get_movement_cost())+"]"
			output+= "\n"
		return output

	def paint_terrain(self):
		for x in range(self.WIDTH):
			for y in range(self.HEIGHT):
				if randint(1,10) == 10:
					self.grid[x][y] = self.hill
				else:
					self.grid[x][y] = self.grass

	def get_movement_cost(self,x,y):
		return self.grid[x][x].get_movement_cost()

class Terrain:

	def __init__(self, movement_cost, is_water, texture):
		self.movement_cost, self.is_water, self.texture = movement_cost , is_water, texture

	def get_movement_cost(self):
		return self.movement_cost

	def is_water(self):
		return is_water


new_world = World(20, 15)
new_world.paint_terrain()

print new_world

'''
Output:

[1][1][3][1][3][1][1][3][1][3][1][1][3][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[1][1][1][1][3][1][1][1][1][1][3][1][1][1][1]
[1][3][3][1][3][1][1][1][1][1][1][1][1][3][1]
[1][1][1][1][1][1][1][3][1][1][1][1][1][1][1]
[1][1][1][1][3][1][3][1][1][1][1][3][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][3]
[1][1][1][3][1][1][1][1][1][1][1][3][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[3][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[3][1][3][1][1][3][1][1][1][1][1][1][1][1][1]
[1][3][3][1][3][3][1][1][1][1][1][1][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[1][1][1][3][3][3][1][1][1][1][1][1][1][1][1]
[1][1][1][3][1][3][1][1][3][1][1][1][1][1][1]
[1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]
[1][1][1][1][1][1][1][3][1][1][1][1][1][1][1]
[1][1][1][3][1][1][1][1][1][3][1][1][1][1][1]

'''