ztv.py 文件源码

def redraw_overview_image(self, msg=None):
        if msg is True or self.ztv_frame._pause_redraw_image:
            return
        if hasattr(self, 'axes_image'):
            if self.axes_image in self.axes.images:
                self.axes.images.remove(self.axes_image)
        # note that following is not an actual rebin, but a sub-sampling, which is what matplotlib ultimately
        # would do on its own anyway if we gave it the full image.  But, matplotlib takes longer.  For a 2Kx2K
        # image, this saves almost 0.3sec on a ~2014 MacBookProRetina
        max_rebin_x = float(self.ztv_frame.display_image.shape[1]) / self.size.x
        max_rebin_y = float(self.ztv_frame.display_image.shape[0]) / self.size.y
        rebin_factor = max(1, np.int(np.floor(min([max_rebin_x, max_rebin_y]))))
        self.axes_image = self.axes.imshow(self.ztv_frame.normalize(self.ztv_frame.display_image)[::rebin_factor, 
                                                                                                  ::rebin_factor],
                                           interpolation='Nearest', vmin=0., vmax=1.,
                                           extent=[0., self.ztv_frame.display_image.shape[1], 
                                                   self.ztv_frame.display_image.shape[0], 0.],
                                           cmap=self.ztv_frame.get_cmap_to_display(), zorder=0)
        clear_ticks_and_frame_from_axes(self.axes)
        self.set_xy_limits()
        self.figure.canvas.draw()