Limit the zoom and panning area

[tad-lispy]

Hi! Thanks for this useful plugin.

Is there a way to limit how much the camera can zoom in or out? Or how far it can pan away?

[johanhelsing]

Not currently, but it would probably be a useful feature to support.

Implementation-wise, we could just add two fields, max_scale and min_scale to the PanCam struct, and update the line here to use clamp instead of max:

bevy_pancam/src/lib.rs

Line 36 in 109d72e

projection.scale = (projection.scale * (1. + -scroll * 0.001)).max(0.00001);

Let me know if you want to have a go at it, or I might do it myself once I'm done with a couple of other projects.

Sorry for the slow response time.

[johanhelsing]

Since I implemented the zooming part of this, I created a new issue for the remaining panning/viewable area part. I wont be picking it up now, so feel free to have a go at it if you need the feature.