[pygame] Help : speed

[facelle@tiscali.it]

Hi,

I am just playing with pygame trying to build a simple 2D platform game
with characters moving along the horizontal axis.

I want to be able to move them at different speeds.
How to do that ?

Each character has a self.speed attribute, which contains the number of
pixels per second.
I set up a global clock (called "counter") ranging from 0 to 1 second and
then resetting to 0.
Since I want to keep the animation as smooth as possible, I think movements
must be always by one pixel at a time, so the question is WHEN to move
characters going at different speeds within the time unit.

For example, suppose I have the following characters :

-"Hero" moving at 2 pixels per seconds => it moves by one pixel when the
clock is at 0.5 seconds (or 500 milliseconds) and when it is at 1 second
(or 1000 milliseconds).

-"Villain" with speed of 5 pixels per seconds => it moves by one pixel when
clock is at 0.2 - 0.4 - 0.6 -  0.8 - 1.00


How to translate this approach in Python ?
I tried the following code ("move" is a function of the class "character")
:

--------------------------------------------------
def move(self):

      global counter

      self.sp = counter*self.speed

      if self.sp == int(self.sp) :
      # clock has reached the proper value to move the
      # character according to its speed

         self.pos = self.pos.move(1, 0)
      # moves by one pixel to the right

         self.sp = 0

      return

--------------------------------------
But it does not work.

Any help is appreciated. Thanks in advance.

Fabrizio

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