canvas.py 文件源码

def draw_ruler(self, dc):
        dc.SetPen(wx.Pen((255,255,255), width=2, style=wx.SOLID))
        x1 = max(self.imgbox[0], self.box[0])+5
        x2 = min(self.imgbox[2], self.box[2])+x1-10
        pixs = (x2-x1+10)*self.ips.size[1]/10.0/self.imgbox[2]
        h = min(self.imgbox[1]+self.imgbox[3],self.box[3])-5
        dc.DrawLineList([(x1,h,x2,h)])
        dc.DrawLineList([(i,h,i,h-8) for i in np.linspace(x1, x2, 3)])
        dc.DrawLineList([(i,h,i,h-5) for i in np.linspace(x1, x2, 11)])

        dc.SetTextForeground((255,255,255))
        k, unit = self.ips.unit
        text = 'Unit = %.1f %s'%(k*pixs, unit)
        dw,dh = dc.GetTextExtent(text)
        dc.DrawText(text, (x2-dw, h-10-dh))