Aspect ratio meta-issue

[mkborregaard]

Would be nice to work over and consider how aspect ratio works in Plots.
The main issue being the relationship between plot aspect ratio and data aspect, and how they behave in layouts.
Relevant issues:

• Keep colorbar next to contour plot when aspect ratio is changed in PyPlot Keep colorbar next to contour plot when aspect ratio is changed in PyPlot #484
• Match plot and image aspect ratios Match plot and image aspect ratios #1238
• aspect_ratio = :equal with legend = false not correct for plotlyjs() aspect_ratio = :equal with legend = false not correct for plotlyjs() #1603
• use equal aspect ratio by default for images? use equal aspect ratio by default for images? #1898
• aspect_ratio=:equal in 3d plots doesn't always work? aspect_ratio=:equal in 3d plots doesn't always work? #1949
• aspect_ratio breaks link aspect_ratio breaks link #1990
• aspect_ratio does not fully work with pgfplots() aspect_ratio does not fully work with pgfplots() #2037

[rjpower4]

Does this merge assist in any way?

Apparently as of matplotlib 3.3.0, this will give correct equal aspect ratio in 3D (taken from here):

import numpy as np

xs, ys, zs = <your data>
ax = <your axes>

# Option 1: aspect ratio is 1:1:1 in data space
ax.set_box_aspect((np.ptp(xs), np.ptp(ys), np.ptp(zs)))

# Option 2: aspect ratio 1:1:1 in view space
ax.set_box_aspect((1, 1, 1))

[FelixBenning]

It seems like aspect_ratio=1 breaks layouts:

losssurface = plot(-5:0.1:5, -5:0.1:5, f, st=:contour, title="Losssurface")
plot!(
	losssurface,
	decent_steps[1,:], 
	decent_steps[2,:],
	markershape=:circle,
	arrow=:arrow,
	label="Path of Gradient Decent",
	aspect_ratio=1
)
loss = plot(
	mapslices(f, decent_steps;dims=(1))', 
	st=:scatter, 
	label=missing, 
	title="Loss", 
	xlabel="Iteration",
)
plot(losssurface, loss, layout=grid(1,2, widths=[0.7,0.3]))

Without the aspect_ratio=1 the plots are well aligned

using the keyword heights did not seem to have an effect, but I still might be missing some options

[toma-vlad]

It seems like aspect_ratio=1 breaks layouts:

losssurface = plot(-5:0.1:5, -5:0.1:5, f, st=:contour, title="Losssurface")
plot!(
	losssurface,
	decent_steps[1,:], 
	decent_steps[2,:],
	markershape=:circle,
	arrow=:arrow,
	label="Path of Gradient Decent",
	aspect_ratio=1
)
loss = plot(
	mapslices(f, decent_steps;dims=(1))', 
	st=:scatter, 
	label=missing, 
	title="Loss", 
	xlabel="Iteration",
)
plot(losssurface, loss, layout=grid(1,2, widths=[0.7,0.3]))

Without the aspect_ratio=1 the plots are well aligned

using the keyword heights did not seem to have an effect, but I still might be missing some options

I have had a similar issues, mine manifested whenever i was trying to look at the axes limits.

See #3479 (comment)