#--------------------------------------------------------------------
# animat4.py - by C.Fin 3/2008 - For Python 2
#--------------------------------------------------------------------

import Tkinter
from random import randint

#---------------------------------------------------------------------

class Screensaver:
    def __init__ (self,canvas,numrighe):
        self.vx=[0]*4
        self.vy=[0]*4
        self.x=[0]*4
        self.y=[0]*4
        self.linea=[None]*4*numrighe
        self.lineapunt=0
        self.max_linea_punt=numrighe-1
        self.minx=2
        self.miny=2
        self.maxx=int(canvas["width"])
        self.maxy=int(canvas["height"])
        self.tela=canvas
        for p in xrange(4):
            self.vx[p]=randint(5,15)
            self.vy[p]=randint(5,10)
            self.x[p]=randint(self.minx,self.maxx)
            self.y[p]=randint(self.miny,self.maxy)
        for p in xrange(numrighe):
            for i in xrange(3):
                self.linea[i+p*4]=canvas.create_line(
                    self.x[i],self.y[i],self.x[1+i],self.y[1+i],
                    dash=1,width=1,fill="yellow")
            self.linea[3+p*4]=canvas.create_line(
                self.x[3],self.y[3],self.x[0],self.y[0],
                dash=1,width=1,fill="yellow")

    def disegna(self):
        for i in xrange(4):
            x2=self.x[i]+self.vx[i]
            y2=self.y[i]+self.vy[i]
            if x2>self.maxx:
                x2=self.maxx ; self.vx[i]=-randint(5,15)
            if y2>self.maxy:
                y2=self.maxy ; self.vy[i]=-randint(5,15)
            if x2<self.minx:
                x2=self.minx ; self.vx[i]=randint(5,10)
            if y2<self.miny:
                y2=self.miny ; self.vy[i]=randint(5,10)
            self.x[i]=x2
            self.y[i]=y2
        a=self.lineapunt*4         
        colore="#%2x%2x%2x" % (
            randint(0,255), randint(0,255), randint(0,255) )
        self.tela.coords(
            self.linea[a],self.x[0],self.y[0],self.x[1],self.y[1])
        self.tela.itemconfig(self.linea[a], fill=colore)
        self.tela.coords(
            self.linea[a+1],self.x[1],self.y[1],self.x[2],self.y[2])
        self.tela.itemconfig(self.linea[a+1], fill=colore)
        self.tela.coords(
            self.linea[a+2],self.x[2],self.y[2],self.x[3],self.y[3])
        self.tela.itemconfig(self.linea[a+2], fill=colore)
        self.tela.coords(
            self.linea[a+3],self.x[3],self.y[3],self.x[0],self.y[0])
        self.tela.itemconfig(self.linea[a+3], fill=colore)
        self.lineapunt+=1
        if self.lineapunt>self.max_linea_punt: self.lineapunt=0
        
#---------------------------------------------------------------------

class Applicazione:
    def __init__ (self):
        self.form1=Tkinter.Tk()
        self.form1.title("Animazione4")
        self.form1.resizable(0,0)
        self.canvas1=Tkinter.Canvas(
            self.form1, width=500,height=400, bg="black")
        self.canvas1.pack()
        self.screensaver=Screensaver(self.canvas1,30)
        self.animazione()

    def animazione(self):
        self.screensaver.disegna()
        self.canvas1.after(10, self.animazione)
            
#---------------------------------------------------------------------

applicazione=Applicazione()
applicazione.form1.mainloop()