[Pyode-user] Newb Problem with tut2!

[Matthias <Sta...@gm...>]

Hi!
I am very new to ODE! I had a look at tutorial 1 and 2, and i wanted to make
my own little test sample!

The program is very similar to tutorial2 but very selfmade, but it doesnt
work! Why? I dont know!! I think there is a problem with the coordinates! 
I wrote the following code:

#! /usr/bin/env python

import pygame
from pygame.locals import *
import ode

WIDTH = 800
HEIGHT = 600

def coord(x, y):
	x = x * (WIDTH / 4);
	y = HEIGHT - y * (HEIGHT / 4);
	return x, y

def initPygame():
	pygame.init()
	srf = pygame.display.set_mode( (WIDTH, HEIGHT) )
	pygame.display.set_caption('Kran Beispiel mittels ODE')

	return srf

def initOde():
	world = ode.World()
	world.setGravity( (0, -9.81, 0) )

	return world

def makeKugel(w):
	kugel = ode.Body(w)
	m = ode.Mass()
	m.setBox(7900, 0.2, 0.2, 0.3)	
	kugel.setMass(m)
	kugel.setPosition( (3, 3.8, 0) )

	return kugel

def drawKran(srf):
	
	srf.lock()
	
	pygame.draw.rect(srf, (100, 200, 40), (coord(0, 4), coord(2, 3.8)), 0)
	pygame.draw.rect(srf, (100, 200, 40), (coord(0, 4), coord(0.2, 0)), 0)

	srf.unlock()
	

if __name__ == '__main__':

	loop = True
	fps = 50
	dt = 1.0 / fps
	clk = pygame.time.Clock()

	srf = initPygame()
	world = initOde()

	kugel = makeKugel(world)
	bj = ode.BallJoint(world)
	bj.setAnchor( (2, 3.8, 0) )

	bj.attach(kugel, ode.environment)

	while (loop):

		for e in pygame.event.get():
			if (e.type == QUIT):
				loop = False


		srf.fill( (255,255,255) )

		drawKran(srf)

		kx, ky, kz = kugel.getPosition()
		print kx, ky, kz
		pygame.draw.line(srf, (0,0,0), coord(2, 3.8), coord(kx, ky), 3)

		pygame.draw.rect(srf, (0,100,50), (coord(kx, ky), coord(kx + 0.1, ky -
0.1)), 0)	
		
		pygame.display.flip()

		world.step(dt)
		clk.tick(fps)
	



if you find the bugs please talk to me like talking to a four year old child
(maybe some explanation would be nice ;) )! 

thanks,
Matthias

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