- Added actions to our helloWorld example

Author: SteveClement

helloWorldActions.py

@@ -1,31 +1,49 @@
 #!/usr/bin/env python3
 
-# try to import the cocos module
+# try to import the cocos module and import to our namespace the .actions from the cocos module
 try:
 	import cocos
+	from cocos.actions import *
 except:
 	print('Cannot import cocos. Did you run \'pip install cocos2d\' ?')
 
-# define a simple HelloWorld() class that inherits from cocos.layer.Layer (making it a sub-class of it)
-class HelloWorld(cocos.layer.Layer):
+# define a simple HelloWorld() class that inherits from cocos.layer.ColorLayer (making it a sub-class of it)
+# Difference between .Layer and .ColorLayer is, well, you can Colorize
+class HelloWorld(cocos.layer.ColorLayer):
 	# __init__ is run every time you instantiate the class
 	def __init__(self):
-		# Always call super in the constructor
-		super(HelloWorld, self).__init__()
+		# Always call super in the constructor, we taint the layer with r:64 g:64 b:224 alpha:255
+		super(HelloWorld, self).__init__(64,64,224,255)
 		# label will become an object with all the necessary to display a text, with font TimesNewRoman and it will be center-anchored
 		# Note: .Label is a subclass of CocosNode
 		label = cocos.text.Label('Hello, world', font_name='Times New Roman', font_size=32, anchor_x='center', anchor_y='center')
 		# set the position of our text to x:320 y:240
 		label.position = (320, 240)
 		# add our label as a child. It is a CocosNode object, which know how to render themselves. 
 		self.add(label)
+		# sprite becomes a .Sprite object with our molecule picture
+		sprite = cocos.sprite.Sprite('sprites/molecule.png')
+		# set the position of our sprite to x:320 y;240 the default position is x:0 y:0
+		sprite.position = (320,240)
+		# scale the sprite 2x
+		sprite.scale = 2
+		# add our sprite as a child and make sure it is on top by defining the z-axis, default is z: 0
+		self.add(sprite, z=1)
+		# create a ScaleBy action object that scales our sprite 3x during 2 seconds
+		scale = ScaleBy(3, duration=2)
+		# Repeat the scale action plus the revers of the scale action to our label
+		label.do(Repeat(scale + Reverse(scale)))
+		# Repeat the reverse of our scale action plus the scale action to our sprite
+		sprite.do(Repeat(Reverse(scale) + scale))
 
 # our main funciton
 def main():
 	# We initialize the director, that takes care of our main window
 	cocos.director.director.init()
 	# We instantiate hello_layer with our HelloWorld() class
 	hello_layer = HelloWorld()
+	# All CocosNode objects can execute actions, so we can execute ONE rotate action on ALL of our layers. 360deg-turn in 10 seconds
+	hello_layer.do(RotateBy(360, duration=10))
 	# Now we create a .Scene and pass our HelloWorld() object stored in hello_layer, as a child
 	main_scene = cocos.scene.Scene(hello_layer)
 	# All setup now. Let's run our main_scene