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Description
Bug summary
IfConnectionPatch zorder is not set to 0, the line drawn will always be on top of theinset_axes axes or the primary plot axes (in this example the x-axis on the plots) even if the zorder of the plot axes is higher than that of theConnectionPatch. In this example, the line draws on top of the x-axis text for both theinset_axesand the primary plot even if the zorder of the axis is changed withplt.setp to be higher than that of theConnectionPatch.
Code for reproduction
fig,ax=plt.subplots(1,1,figsize= (20,5),facecolor="k")#----- main axis -------#plot set upax.set_facecolor('k')ax.tick_params(axis='both',colors='w',labelsize=20,size=5,width=2)ax.spines[['left','right','top','bottom']].set_color('w')ax.spines[['left','right','top','bottom']].set_lw(3)ax.tick_params(axis='both',pad=5,labelfontfamily='sans-serif')#setting plot limitsax.set_xlim(15000,17000)ax.set_ylim(0,1.1)#changing unit of x-tick labelsax.set_xticklabels(ax.get_xticks()/10000)#----- end main axis -------#----- top plot -------#inset axis drawingx1,x2,y1,y2=16360,16555,0.45,1.06axins_1=ax.inset_axes([15850,1.22,1150,0.7],xlim=(x1,x2),ylim=(y1,y2),transform=ax.transData,facecolor='k')#setting tick paramsaxins_1.tick_params(axis='both',direction='inout',color='w',labelsize=14,size=7,width=2)axins_1.spines[['top','bottom','left','right']].set_linewidth(2)axins_1.spines[['left','right','top','bottom']].set_color('w')#changing unit of x-tick labelsaxins_1.set_xticklabels(axins_1.get_xticks()/10000)#drawing the connection to the area on the plotbox,connectors=ax.indicate_inset_zoom(axins_1,edgecolor="w",lw=2,alpha=0.75)#top box LHconnectors[0].set_visible(False)verts_box_top_LH=connectors[0].get_path().vertices#top axis LHconnectors[1].set_visible(False)verts_ax_bottom_LH=connectors[1].get_path().vertices#drawing the line from the bottom left corner of axins_1 to the top left hand corner of the inset boxcon_1=ConnectionPatch(xyA= (verts_box_top_LH[0]),xyB= (verts_ax_bottom_LH[2]),coordsA=ax.transData,coordsB=ax.transData,color="w",lw=2,alpha=0.75,zorder=1)#adding line to figurefig.add_artist(con_1)#top box RHconnectors[3].set_visible(False)verts_box_top_RH=connectors[3].get_path().vertices#bottom axis RHconnectors[2].set_visible(False)verts_ax_bottom_RH=connectors[2].get_path().vertices#drawing the line from the bottom right corner of axins_1 to the top right hand corner of the inset boxcon_2=ConnectionPatch(xyA= (verts_box_top_RH[2]),xyB= (verts_ax_bottom_RH[0]),coordsA=ax.transData,coordsB=ax.transData,color="w",lw=2,alpha=0.75,zorder=1)fig.add_artist(con_2)#----- end top plot -------#----- bottom plot -------#inset axis drawingx1,x2,y1,y2=15675,15850,0.57,1.06axins_2=ax.inset_axes([15000,-1.07,2000,0.7],xlim=(x1,x2),ylim=(y1,y2),transform=ax.transData,facecolor='k')#setting tick paramsaxins_2.tick_params(axis='both',direction='inout',color='w',labelsize=14,size=7,width=2)axins_2.spines[['top','bottom','left','right']].set_linewidth(2)axins_2.spines[['left','right','top','bottom']].set_color('w')#changing unit of x-tick labelsaxins_2.set_xticklabels(axins.get_xticks()/10000)#drawing the connection to the area on the plotbox,connectors=ax.indicate_inset_zoom(axins_2,edgecolor="w",lw=2,alpha=0.75)#bottom box LHconnectors[1].set_visible(False)verts_box_bottom_LH=connectors[1].get_path().vertices#top axis LHconnectors[0].set_visible(False)verts_ax_top_LH=connectors[0].get_path().vertices#drawing the line from the top left of axins_2 to the bottom left hand corner of the inset boxcon_3=ConnectionPatch(xyA= (verts_box_bottom_LH[0]),xyB= (verts_ax_top_LH[2]),coordsA=ax.transData,coordsB=ax.transData,color="w",lw=2,alpha=0.75,zorder=1)#adding line to figurefig.add_artist(con_3)#bottom box RHconnectors[2].set_visible(False)verts_box_bottom_RH=connectors[2].get_path().vertices#top axis RHconnectors[3].set_visible(False)verts_ax_top_RH=connectors[3].get_path().vertices#drawing the line from the bottom right of axins to the top horizontal x-axis ax linecon_4=ConnectionPatch(xyA= (verts_box_bottom_RH[2]),xyB= (verts_ax_top_RH[0]),coordsA=ax.transData,coordsB=ax.transData,color="w",lw=2,alpha=0.75,zorder=1)fig.add_artist(con_4)#----- end of bottom plot -------#----- surrounding the axes labels with a black box for each axis -----plt.setp(ax.get_yticklabels(),backgroundcolor="k",color='w')plt.setp(ax.get_xticklabels(),backgroundcolor="k",color='w')plt.setp(axins_1.get_yticklabels(),backgroundcolor="k",color='w')plt.setp(axins_1.get_xticklabels(),backgroundcolor="k",color='w')plt.setp(axins_2.get_yticklabels(),backgroundcolor="k",color='w')plt.setp(axins_2.get_xticklabels(),backgroundcolor="k",color='w')#----- end of surrounding the axes labels with a black box for each axis -----
Actual outcome
Expected outcome
When usingConnectionPatch to change the lines drawn between the box drawn withindicate_zoom_inset and theinset_axes I had hoped that there was a way have the line drawn in front of the box fromindicate_zoom_inset (e.g. on top of ax in the example) but behind the axis for the inset axis (e.g. behind the x-axis on axins_1 in the example). Like this:
Additional information
If zorder of theConnectionPatch(es) is set to 0, the line drawn is totally behind the axes which is expected, but when zorder = 1 theConnectionPatch(es) always moves to the very top of the figure even if the zorder of the axes for the primary plot or inset axes are higher (e.g. the x-axes in this example).
I also tried putting text over the labels that were intercepted with the line using plt.text and found the same issue, theConnectionPatch(es) always sit over the text, even when the zorder of the text was higher than theConnectionPatch. Additionally, I tried moving whereplt.setp adds the background color to the axes and/or changes the zorder axes for each of the plots, but found none of the places I put it in the code produced the result I wanted. Usually I would put theplt.setp commands where I am setting up the visuals of the axis, but in this case putting it at the end of the code produced the best results.
The only fix I could find for this was drawing two separate lines for each connection between the inset axes and the box from theindicate_zoom_inset (which is how I generated the plot for the expected outcome) but this adds a lot of code and requires a bit of fiddling to get the lines right. The first line I drew was zorder = 0 and disappears behind the primary plot axes (under the x-axes of the plots), the second line would sit on top of the primary axis and draw from the corner of the box fromindicate_zoom_inset to the x-axis line on the primary plot (either on the top or bottom depending on the inset axis I was drawing for--I can provide a code example of this if it is helpful but I didn't think it would be).
I'm not sure if this is intended behavior forConnectionPatch, I know the lines I am drawing are not typical forindicate_zoom_inset since the connected axes are not matching, but I thought I would raise it because I've been struggling with this for a little bit and didn't see any discussion of this behavior anywhere.
Operating system
Mac OS 15.5 (24F74)
Matplotlib Version
3.9.2
Matplotlib Backend
N/A
Python version
Python 3.9.23
Jupyter version
4.4.3
Installation
conda