IN_IDLE = 0

#################################
## Stereogramm mit Blümchentapete
#################################

DPI     = 75 # inch  resolution of display media

OBSDIST = DPI*20    # inch  distance of observer to media
EYESEP = DPI*2.5    # eye separation

MINDEPTH = DPI*1   
MAXDEPTH = DPI*6   
DEPTHSTEPS = 10     # so viele Tiefenstufen zulassen
        
WIDTH = DPI*10      # Bildbreite
HEIGHT = DPI*8      # Bildhöhe

LINES = 12
DY = HEIGHT/(LINES+1)

from Tkinter import *

class Bluemchentapete:

    def __init__(self):
        self.root = Tk()
        self.c = Canvas(self.root, width=WIDTH+6,height=HEIGHT+6)
        self.c.pack()
        self.MID = WIDTH/2+3

    # maximal separation EYESET/2 als Musterbreite,
    # dahinterliegende Muster enger setzen
    def plotline(self,y,depth):
        y = y*DY    # y position on canvas
        depth = DEPTHSTEPS-depth 
        z = MINDEPTH+float(depth)/DEPTHSTEPS*(MAXDEPTH-MINDEPTH)
        separation = 0.5*EYESEP*float(OBSDIST)/(z+OBSDIST)
        # make smaller pattern by this factor
        resize = 1.0/OBSDIST*(z+OBSDIST)

        d = self.MID/separation
        for k in range(-d+1,d+1):
            xpos = self.MID-separation/2+k*separation
            # plot pattern at (x/y), max size, with depth resize 
            self.stamp(xpos,y,EYESEP/2.0,resize) 

    # plot a single pattern
    def stamp(self,x,y,maxsize,scale):
        # s = maxsize/8.0 	# alles gleich groß
        s = maxsize/8.0*scale  # mit Verkleinerung nach Hinten
        self.c.create_oval(x-s,y-s,x+s,y+s,width=4,
                           outline="#0000ff",fill="#ff0000")
        d = s/2.5
        for x1 in (-s/1.4,s/1.4):
            for y1 in (-s/1.4,s/1.4):
                self.c.create_oval(x+x1-d,y+y1-d,x+x1+d,y+y1+d,fill="#00ff00")

    def test(self):
        self.plotline(1,0)
        self.plotline(2,2)
        self.plotline(3,4)
        self.plotline(4,6)
        self.plotline(5,8)
        self.plotline(6,10)
        self.plotline(7,10)
        self.plotline(8,8)
        self.plotline(9,6)
        self.plotline(10,4)
        self.plotline(11,2)
        self.plotline(12,0)


        if not IN_IDLE: self.root.mainloop()

        
b = Bluemchentapete()
b.test()