How easy would be to change the looking angle?

stratosgear commented 5 years ago

Bear with me while I try to explain...

Some kind of angle where:

0: The point of view would be at sea level
45: Almost the point of view we have now
90: Looking directly down on the map. That would be the least helpful of all values, as the lines would look almost parallel, with no elevation info.

But tweaking this param would allow you to better frame your points of interest.

ColCarroll commented 5 years ago

That's a good idea! I am a little nervous about tackling it myself, as I am afraid we'll accidentally build a 3d rendering engine, but probably something like https://en.wikipedia.org/wiki/Perspective_(graphical) would work. Right now, we use a grid and manually control the y offsets. If we did the math on how perspective works, we could change that as the y value gets closer to the top of the screen.

anttimc commented 3 years ago

Hi and thanks the authors for this cool package! I I played around with it a bit and happened to find this issue. By a simple linear scaling of x-values towards the top, I could add quite a satisfying illusion of perspective:

(the elevation data is from Finland, which is not included in the srtm data base apart from the very southern part, so I had to fetch it externally.)

I don't know about fixing the height to the perspective angle. It's conceptually different of what plot_map does currently, so maybe it should be a new function itself (+ some refactoring of the current code, so definitely it could be relatively big feature).

ColCarroll / ridge_map

How easy would be to change the looking angle? #8