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import Image, ImageDraw, ImageTk

# Klasse, um einfach mit pil auf ein tk.Canvas zu zeichnen
class PILCanvas(tk.Canvas): 
    def __init__(self,master,pilx,pily, width, height,pilw, pilh,  bg):
        self.pilx, self.pily = pilx, pily
        tk.Canvas.__init__(self,master, width = width, height = height, bg = bg)
        self.im =  Image.new("1", size = (pilw,pilh), color = bg)
        self.draw = ImageDraw.Draw(self.im)
        image = ImageTk.PhotoImage(self.im) 
        self.create_image(pilx,pily,image=image,tags="image1", anchor = "nw") 
    def pilpoint(self, pos, fill):
        self.draw.point(pos, fill = fill)

    def _update(self):
        print "update"
        self.delete("image1")
        image = ImageTk.PhotoImage(self.im)
        self.create_image(self.pilx, self.pily,image=image,tags="image1", anchor = "nw")
        self.update()
#        self.im.show()

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# in der __init__:
self.can=PILCanvas(self.mf,height=300,width=300,bg="black", pilx = 0, pily = 0, pilw = 300, pilh = 300)
        self.can.grid(row=1,column=1,rowspan=3)

#später:

def calculate(self):   
        a,b,c = float(self.entrys["a"].get()), float(self.entrys["b"].get()), float(self.entrys["c"].get())
        n=int( self.entrys["num"].get())
        if self.x  and self.y:
            x,y=self.x,self.y
        else:
            x,y=0,0
        self.color="red"
        ci=2500
        for i in range(n):
            if not (i%10):
                self.nvar.set(("%i"% (int(self.nvar.get())+10)).rjust(5))
                if 2*ci > i >= 1*ci:
                    self.color='#ff4242'
                elif 3*ci > i >= 2*ci:
                    self.color='#f5ff42'
                elif 4*ci > i >= 3*ci:
                    self.color='#4bff42'
                elif 5*ci > i >= 4*ci:
                    self.color='#42f5ff'
                elif 6*ci > i >= 5*ci:
                    self.color='#4448fd'
                elif 8*ci > i >= 6*ci:
                    self.color='#d943fe'
                elif 9*ci > i >= 7*ci:
                    self.color='#fe4356'                  
            self.can.pilpoint((self.f(x),self.f(y)), fill=self.color)
#            self.can.update()
            if self.algoname.get() == "1. Hopalong":
                xx=y-sign(x)*(abs(b*x-c))**0.5
                yy=a-x
            elif self.algoname.get()== "2. Gingerbreadman":
                xx=1-y+abs(x)
                yy=x
            elif self.algoname.get() == "3. Kamtor3D":
                xx=x*cos(a)+(x*x-y)*sin(a)
                yy=x*sin(a)-(x*x-y)*cos(a)
            else:
                xx=eval(self.algox)
                yy=eval(self.algoy)
            x,y=xx,yy
        self.x,self.y=x,y
        self.can._update()

    def f(self,x):
        return ((x*10)+150)

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image = ImageTk.PhotoImage(self.im)

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        self.im =  Image.new("1", size = (pilw,pilh), color = bg)