# Python Cocos2d Game Development

# Part 2: Scrollable Map

# Tutorial: http://jpwright.net/writing/python-cocos2d-game-2/

# Github: http://github.com/jpwright/cocos2d-python-tutorials

# Jason Wright (jpwright0@gmail.com)

# Imports

import pyglet

from pyglet.window import key

import cocos

from cocos import actions, layer, sprite, scene, tiles

from cocos.director import director

# Player class

class Me(actions.Move):

# step() is called every frame.

# dt is the number of seconds elapsed since the last call.

def step(self, dt):

super(Me, self).step(dt) # Run step function on the parent class.

# Determine velocity based on keyboard inputs.

velocity_x = 100 * (keyboard[key.RIGHT] - keyboard[key.LEFT])

velocity_y = 100 * (keyboard[key.UP] - keyboard[key.DOWN])

# Set the object's velocity.

self.target.velocity = (velocity_x, velocity_y)

scroller.set_focus(self.target.x, self.target.y)

# Main class

def main():

# Declare these as global so they can be accessed within class methods.

global keyboard

global scroller

# Initialize the window.

director.init(width=800, height=600, do_not_scale=True, resizable=True)

# Create a layer and add a sprite to it.

player_layer = layer.ScrollableLayer()

me = sprite.Sprite('human-female.png')

player_layer.add(me)

# Set initial position and velocity.

me.position = (100, 100)

me.velocity = (0, 0)

# Set the sprite's movement class.

me.do(Me())

# Create scroller object and load tiles.

scroller = layer.ScrollingManager()

map_layer = tiles.load('tiles/map.xml')['map0']

# Add map and player layers.

scroller.add(map_layer)

scroller.add(player_layer)

# Create a scene and set its initial layer.

main_scene = scene.Scene(scroller)

# Attach a KeyStateHandler to the keyboard object.

keyboard = key.KeyStateHandler()

director.window.push_handlers(keyboard)

# Play the scene in the window.

director.run(main_scene)

if __name__ == '__main__':

main()