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Visualiser des lignes de champs de forces (gravité, etc…) sur un objet.
Utiliser Ok pour opposer la gravité de l’objet

from kandinsky import *
from ion import *
from time import *

px,py=0,0
sens=1
#===/\
#set it to 1 or -1
#and test 0, -2, 3, 2.5...
space=32
#===/\
#set also it to 20 or 40 to test
color=(128+(127*sens),0,128-(127*sens))


try:
  draw_line(0,0,0,0,(0,0,0))
except:
  def draw_line(x1,y1,x2,y2,c):
    width=x2-x1
    height=y2-y1
    if abs(width)>=abs(height):
      div=height/width
      for i in range(0,width,(width>0)*2-1):
        set_pixel(x1+i,y1+int(div*i),c)
    else:
      div=width/height
      for i in range(0,height,(height>0)*2-1):
        set_pixel(x1+int(div*i),y1+i,c)


def dist(x,y):
  return ((x-px)**2+(y-py)**2)**0.5

def draw_all():
  for x in range(space//2,330,space):
    for y in range(space//2,230,space):
      d=int(dist(x,y))
      try:
        i_d=sens/d**2*1000
      except:
        i_d=0

      fill_rect(x-1,y-1,3,3,(180,)*3)
      if i_d:
        draw_line(x,y,x+int((px-x)*i_d),y+int((py-y)*i_d),(180,)*3)
  fill_rect(px-3,py-3,7,7,color)


while True:
  for i in range(4):
    if keydown(i):
      fill_rect(0,0,320,222,(255,)*3)
      px+=[-1,0,0,1][i]*5
      py+=[0,-1,1,0][i]*5
      px%=320
      py%=220
  if keydown(KEY_OK):
    fill_rect(0,0,320,222,(255,)*3)
    sens*=-1
    color=(128+(127*sens),0,128-(127*sens))
  draw_all()
  sleep(0.05)