def podzial_odcinka():
a = 100.0
b = (a ** 2 + (a / 2) ** 2) ** 0.5
c = b - a / 2
p = PS()
p.translate(200, 200)
p.newpath()
p.moveto(0, 0)
p.rline(a, 0)
p.colour(1, 0, 0)
p.stroke()
p.newpath()
p.moveto(a, 0)
p.rline(c, 0)
p.colour(0, 1, 0)
p.stroke()
p.newpath()
p.moveto(0, 0)
p.rline(0, a)
p.rline(a, 0)
p.rline(0, -a)
p.moveto(a / 2, 0)
p.rline(0, a)
p.colour(0, 0, 0)
p.stroke()
p.newpath()
p.moveto(a / 2, 0)
p.line(a, a)
p.dash()
p.colour(0, 0, 0)
p.stroke()
p.newpath()
a2 = math.degrees(math.atan(a / (a / 2)))
p.arc(a / 2, 0, b, 0, a2)
p.stroke()
p.setfont()
p.newpath()
p.moveto(-5, -10)
p.text("A")
p.moveto(a / 2 - 5, -10)
p.text("B")
p.moveto(a - 5, -10)
p.text("C")
p.moveto(a + c - 5, -10)
p.text("D")
p.moveto(a - 5, a + 5)
p.text("E")
print p.gen()
odcinek = open("odcinek.ps", "w")
odcinek.write(p.gen())
odcinek.close()
def pole(a, b, c):
return (b[0] - a[0]) * (c[1] - a[1]) - (c[0] - a[0]) * (b[1] - a[1])
n = int(raw_input("POdaj liczbe wierzcholkow: "))
w = []
for i in range(n):
tmp = raw_input("Podaj w%d w formacie x,y np: 6,8: ")
tmp = tmp.split(',')
print tmp
w.append((float(tmp[0].strip()), float(tmp[1].strip())))
suma = 0
for i in range(n - 1):
suma += pole(w[0], w[i], w[i + 1])
suma /= 2.0
print suma
p = PS()
p.setfont()
p.translate(200, 200)
p.newpath()
p.moveto(*w[0])
for i in w:
p.line(*i)
p.line(*w[0])
p.stroke()
p.moveto(0,-50)
p.text("Pole = %f" % suma)
with open("pole.ps", "w") as pole:
pole.write(p.gen())
