保存图形时，无法完全显示颜色条

Question

以我从PyHOGS学到的代码为例：

 cmap = plt.cm.Spectral

 # Generate some fake data
 N = 100
 nlines = 10
 x = np.linspace(-np.pi, np.pi, N) 
 y = np.linspace(-np.pi, np.pi, nlines)

 # Use np.newaxis to create [N,1] and [1,Nlines] x and y arrays
 # Then broadcasting to generate Z with shape [N,Nlines]
 z = np.sin(x[:,np.newaxis] + y[np.newaxis,:]/4)

 # Use 0-1 values to generate the colors with the linspace method
 line_colors = cmap(np.linspace(0,1,nlines))


 # because the custom axes generation is the only way I've
 # figured out.
 from matplotlib.gridspec import GridSpec
 fig = plt.figure(figsize = (12,6))
 nrows = 2
 gs = GridSpec(nrows,2,width_ratios=[50,1])
 ax = [plt.subplot(gs[i,0]) for i in range(nrows)]
 cbax1 = plt.subplot(gs[1,1])

 # First, plot lines w/ legend
 a = ax[0]
 a.set_title('Labeling with a legend')

 for i in range(nlines):
      a.plot(x, z[:,i], c=line_colors[i],lw=3,label='{:4.1f}'.format(y[i]))
      leg = a.legend(loc='center left', bbox_to_anchor=(1, 0.5), ncol=2)
      leg.set_title('Y')

 # Next, plot with colorbar
 a = ax[1]
 a.set_title('Labeling with a "continuous" colorbar')

 for i in range(nlines):
     a.plot(x, z[:,i], c=line_colors[i],lw=3,label='{:3.1f}'.format(y[i]))

 # Generate fake ScalarMappable for colorbar
 sm = plt.cm.ScalarMappable(cmap=cmap,     norm=plt.Normalize(vmin=y[0],vmax=y[-1]))
 sm.set_array([])  # You have to set a dummy-array for this to work...
 cbar = plt.colorbar(sm, cax=cbax1)
 cbar.set_label('Y')
 cbar.set_ticks(y)
 cbar.set_ticklabels(['{:4.1f}'.format(yi) for yi in y]) # Make 'em nicer-looking

 # Moves colorbar closer to main axis by adjusting width-spacing between subplot     axes.
 fig.subplots_adjust(wspace=0.05, hspace=0.4)

 # Set axis limits
 for a in ax:
     a.set_xlim(-np.pi, np.pi)

 plt.savefig("./POP_LULC/example_colorbar.png")

当我将其保存为.png或.pdf时，图形无法完全显示，彩条（a）上的某些信息丢失，如下所示：
http://i5.tietuku.com/1701d9dcd4e5f24a.png

那就是我的问题，希望你的亲切指导！

使用后

    plt.tight_layout().        

这是我的下一个例子：

• jupyter笔记本中的屏幕切换 http://i12.tietuku.com/f43490f03407695d.png

• 保存png：
  http://i12.tietuku.com/f9faed607cac0a7a.png

图中右侧的图例即使放大了L / h也无法完全显示？

Answer 1

您需要在右侧为两列图例创建一些空间。您可以通过此处已有的subplots_adjust来拨打电话。除了设置hspace和wspace之外，subplots_adjust还可以使用kwargs left，right，{{1}更改子图位置和边距}和bottom。

您只需设置top参数即可。在这种情况下，我发现将其设置为right效果很好。

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