def getRay(self):
    self.rays,self.abcs,self.dots = [[],[],[]]
    sDot = self.source          #光源為第一個點
    sRay = rp.getABC(self.sourceDict['theta'],sDot)
    inPoint,outPoint,flec,frac = self.opti.singleReflect(sRay,sDot,1)
    if inPoint == []: return [] #無交點返回空list
    self.dots.append(inPoint)
    self.rays.append([sDot,inPoint])
    crossflec = self.crossRagion(flec,inPoint)
    if crossflec != []:
        self.dots.append(crossflec)
        self.rays.append([inPoint,crossflec])
        self.abcs.append(flec)
    if outPoint == []: return []
    self.dots.append(outPoint)
    self.rays.append([inPoint,outPoint])
    if frac == []: return []
    crossfrac = self.crossRagion(frac,outPoint)
    if crossflec != []:
        self.dots.append(crossfrac)
        self.rays.append([outPoint,crossfrac])
        self.abcs.append(frac)
##求光線與界面邊緣的交點
def crossRagion(self,ray,point):
    w,h = self.drawPanel.GetSize()
    edges = [[(0,0),(0,w)],[(0,h/2),(0,-h/2)],[(0,-h/2),(w,-h/2)],
            [(w,-h/2),(w,h/2)],[(w,h/2),(0,h/2)]]
    for dots in edges:
        cross=rp.getCross(ray,dots,point)
        if cross!=[]:
            return cross
    return []

def DrawPath(self):
    w,h = self.drawPanel.GetSize()      #獲取畫布尺寸
    dc = wx.ClientDC(self.drawPanel)
    dc.SetPen(wx.Pen('#666666'))
    dc.DrawRectangle(0,0,w,h)
    dc.SetDeviceOrigin(0,h/2)
    dc.SetAxisOrientation(True,True)    #坐標系翻轉(zhuǎn) 
    dc.SetPen(wx.Pen('#0000FF'))
    dc.DrawLine(0,0,w,0)
    dc.SetPen(wx.Pen('#00FF00'))
    ##繪制透鏡
    for edge in self.opti.edges:
        dots = edge['dots']
        if len(dots)==2:                #此時為平面
            dc.DrawLine(dots[0][0],dots[0][1],
                            dots[1][0],dots[1][1])
        elif len(dots)==3:              #此時為曲面
            x3,y3,_=rp.arc2cir(dots)
            if dots[1][0]>dots[2][0]:   #畫劣弧
                dc.DrawArc(dots[0][0],dots[0][1],
                           dots[1][0],dots[1][1],x3,y3)
            else:
                dc.DrawArc(dots[1][0],dots[1][1],
                           dots[0][0],dots[0][1],x3,y3)
    dc.SetPen(wx.Pen('#FF0000'))
    ##繪制光源
    dc.DrawCircle(self.source[0],self.source[1],10)
    ##繪制光線
    for ray in self.rays:
        dc.DrawLine(ray[0][0],ray[0][1],
                    ray[1][0],ray[1][1])
    ##繪制光線與物體表面的交點
    dc.SetPen(wx.Pen('#FF00FF'))
    for dot in self.dots:
        dc.DrawCircle(dot[0],dot[1],5)