Source Code for Script script-demo_helloJoy_py

 1  from joy import * 
 2   
 3 -class HelloJoyApp( JoyApp ): 
 4    """HelloJoyApp 
 5     
 6       The "hello world" of JoyApp programming. 
 7       This JoyApp pipes the y coordinate of mouse positions (while left 
 8       button is pressed) to a specified setter. By default this setter is 
 9       given by "#output " -- i.e. it is a debug message.  
10        
11       See JoyApp.setterOf() for a specification of possible outputs 
12    """ 
13 -  def __init__(self,spec,*arg,**kw): 
14      # This is a "constructor". It initializes the JoyApp object. 
15      # Because we added an additional parameter, we extend the  
16      # JoyApp constructor. The first step is to call the superclass 
17      # constructor so that we'll have a valid JoyApp instance. 
18      JoyApp.__init__(self, *arg,**kw) 
19      # Store output specifier for later use 
20      self.spec = spec 
21       
22 -  def onStart(self): 
23      # This function is called when the JoyApp is ready to start up, 
24      # i.e. after all PyGame devices have been activated, robot Cluster 
25      # is populated, scratch interface is live, etc. 
26      self.output = self.setterOf(self.spec) 
27   
28 -  def onEvent(self,evt): 
29      # All unknown events --> punt to superclass 
30      if evt.type != MOUSEMOTION or evt.buttons[0] == 0: 
31        return JoyApp.onEvent(self,evt) 
32      # If we reach this line, it was a MOUSEMOTION with button pressed 
33      #   so we send the value out to the output 
34      self.output( evt.pos[1] ) 
35  if __name__=="__main__":   
36    app = HelloJoyApp("#output ") 
37    app.run() 
38