Various implementations

[juanmanzanero]

Dear @brenocq

Thank you for this very nice plotting library. I'd like to contribute with some features that me and others might benefit from:

• Possibility to choose ZBuffer for items, since sometimes you want to force something to be back/front of other items
• Legend Popup (as in ImPlot)
• Legend Custom Font: sometimes you'd want a custom font (e.g. monospaced) for a legend. This something I also have in my own copy of ImPlot but since that repository is not very active, I have not contributed to it.
• Annotations (as in ImPlot)
• Auto Scale the Box: move the NDC Scalings to best fit the box while making sure the labels are seen
• Stretch to Fit the box: this is something that matlab has in its "axis normal" mode. It conflicts with axis equal, but hey.

To implement these I had to:

• Edit the way the axis labels are positioned: delta position in pixel rather than in NDC
• Edit the way the ticks are measured: size in pixels rather than NDC

And also:

• I have changed the way the number of ticks are computed because for small sizes I was getting 33.3333 66.6666 and so on.

Thank you for your time.

[brenocq]

Hi @juanmanzanero! That's a lot of features hahahha thank you for pouring so much time into ImPlot3D

I suggest you to create 6 feature requests issues (one for each feature that you implemented), and create one separate PR for each feature. Each feature PR should also contain a demo for the new feature (this helps me test the PR, and quite nice for people exploring the ImPlot3D demos to see your feature in action).

I probably need to document a bit better the feature contribution process kkkkk

[brenocq]

Oh, I think this needs to change:

-IMPLOT3D_API void Annotation(double x, double y, double z, const ImVec4& col, const ImVec2& pix_offset, bool clamp, const char* fmt, ...)           IM_FMTARGS(6);
-IMPLOT3D_API void AnnotationV(double x, double y, double z, const ImVec4& col, const ImVec2& pix_offset, bool clamp, const char* fmt, va_list args) IM_FMTLIST(6);
+IMPLOT3D_API void Annotation(double x, double y, double z, const ImVec4& col, const ImVec2& pix_offset, bool clamp, const char* fmt, ...)           IM_FMTARGS(7);
+IMPLOT3D_API void AnnotationV(double x, double y, double z, const ImVec4& col, const ImVec2& pix_offset, bool clamp, const char* fmt, va_list args) IM_FMTLIST(7);