indicate_inset_zoom not working on some projections #2482
Comments
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Matplotlib has two versions of I doubt either way will work with Cartopy transforms but, to understand what needs to be done to make it work, we should start with an example that uses the right pair of functions. I suggest that |
Thanks, unfortunately the version with the right map_proj = ccrs.TransverseMercator(
)
fig, ax = plt.subplots(
figsize=(15, 15),
subplot_kw={
"projection": map_proj
},
)
ax.set_extent([-50, 15, 50, 70], crs=ccrs.PlateCarree())
ax.add_feature(cfeature.OCEAN.with_scale('50m'), facecolor="lightsteelblue", zorder=1)
ax.coastlines(linewidth=0.2, zorder=2)
inset_ax = ax.inset_axes(
(0.05, 0.05, 0.3, 0.3),
projection=map_proj
)
inset_extent = [-44, -38, 63, 66]
inset_ax.set_extent(inset_extent, crs=ccrs.PlateCarree())
inset_ax.add_feature(cfeature.OCEAN, facecolor="lightsteelblue", zorder=1)
x = [inset_extent[0], inset_extent[1], inset_extent[1], inset_extent[0], inset_extent[0]]
y = [inset_extent[2], inset_extent[2], inset_extent[3], inset_extent[3], inset_extent[2]]
ax.plot(x, y, color='k', alpha=0.5, transform=ccrs.PlateCarree())
# # Draw lines between inset map and box on main map
rect, connectors = ax.indicate_inset_zoom(inset_ax, edgecolor="black", alpha=0.5, transform=ax.transAxes)
I just tried to remove the the
Just for context, I was using this example https://predictablysunny.com/posts/inset_map_cartopy/ which was also using the |
Actually I think this is the correct behaviour: since both your main axes and your inset axes are in the same projection, the indicator box should not be transformed. The indicator box is showing the actual extent of the inset axes, which encompasses (but does not match) what you set with |
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With a few tweaks in Matplotlib, we can have more interesting combinations matplotlib/matplotlib#29174 |
Description
On most non-standard projections (like
TransverseMercator) the connectors to an inset axis are not drawn correctly.Code to reproduce
produces this
However, for some projections like
MercatororPlateCarree, it worksFull environment definition
Cartopy version
0.24.0
conda list
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