drawStairs

pict = makeEmptyPicture(500,500,white)
color = makeColor(pickAColor())

def drawStairs(pict,a,b,c,d,color):
#@param:
#  pict: picture;
#  a: initial width;
#  b: initial height;
#  c: horizontal component lenth;
#  d: vertical component lenth;
#  color: stairs color;
  width = getWidth(pict)
  height = getHeight(pict)
  for i in range(a,width,c):
    drawHorizontalLineGen(pict,a,b,c,color)
    a = a+c
    drawVerticalLineGen(pict,a,b,d,color)
    b = b+d
    repaint(pict)

def drawHorizontalLineGen(pict,x,y,w,color):
# @param:
#  x: int, starting point on x axis;
#  y: int, starting point on y axis;
#  w: int, lenght of the line
  for x in range(x,min(x+w,getWidth(pict))):
    setColor(getPixel(pict,x,min(-1+getHeight(pict),y)),color)

def drawVerticalLineGen(pict,x,y,w,color):
# @param:
#  x: int, starting point on x axis;
#  y: int, starting point on y axis;
#  w: int, lenght of the line

  for y in range(y,min(y+w,getHeight(pict))):
    setColor(getPixel(pict,min(x,(-1+getWidth(pict))),y),color)
#------------------------------------------------------------------