zoom=2.0
zoom_scale_step=math.pow(zoom,1./20.)

while 1:
        
        #Now... WHEN A POINT IS CLICKED,
        #TRANSLATE THE scene.center TO THE CLICKED POINT, WHILE ZOOMING

        if scene.mouse.events:

            MOUSE_EVENT=scene.mouse.getevent()
            if (MOUSE_EVENT.press=='left' or
               MOUSE_EVENT.press=='right' or MOUSE_EVENT.press=='middle'):
                if MOUSE_EVENT.press=='left': #ZOOM IN
                    scale_factor=zoom
                    scale_step=zoom_scale_step
                elif MOUSE_EVENT.press=='right': #ZOOM OUT
                    scale_factor=1./zoom
                    scale_step=1./zoom_scale_step
                else: #NO ZOOM
                    scale_factor=1.0
                    scale_step=1.0

                target=MOUSE_EVENT.pos
                c=complex(target[0], target[1])

                
                scene.title="a=(%10.7f,%10.7f) c=(%10.7f,%10.7f) MAX=%10.7f" % (a.real,a.imag, c.real,c.imag,MAX)
                MAX /= scale_factor
                if scale_factor>=1:
                    bins=julia(a,c,MAX,bins)
                    draw_region(c,MAX,bins)
                
                step=(target-scene.center)/20.
                for i in arange(0,20):
                        rate(50)
                        scene.center +=step
                        scene.scale *= scale_step  #(zoom_scale_step**20.=2.0)
                scene.center=target