Add Primitives

[antongit]

https://github.com/ocornut/imgui/blob/cb48c81a448aa0a4867e327c0a045a708ff3842e/imgui.h#L2529

[azeno]

@antongit I've just added the Line, the other primitives should be doable the same way. See also my comments in code, there's some room for thought regarding the coordinate system one would assume when drawing and also how effective we can apply a transformation. But when we think about modifying the render matrix directly we'll also need to take other rendering backends like Stride into account.

[antongit]

@azeno I'm getting an Exception (.5 related not ImGui). The patch was working, I've saved it under another name. Exception came. I've restarted VL, still exception. The Patch is attached.

HowTo Make Window's Background Multicolor.zip

[antongit]

TODO:

• Forward ImDrawFlags, when Ctrl+J will work again
• NGon is actually called Segment in vvvv, should we name it this way or stick to ImGui namings?: Segment tag
• Strangely, this overload is missing in .net for AddText, although it would be good to be able to set the wrap_width: https://github.com/ocornut/imgui/blob/cb48c81a448aa0a4867e327c0a045a708ff3842e/imgui.h#L2549
• AddPolyline, AddConvexPolyFilled can't be added at the moment without clarifying how to deal with the Offset
  https://github.com/ocornut/imgui/blob/cb48c81a448aa0a4867e327c0a045a708ff3842e/imgui.h#L2550
• Image Primitives are missing. Do we need them? If so, first is @azeno's part about the ImTextureID
  https://github.com/ocornut/imgui/blob/cb48c81a448aa0a4867e327c0a045a708ff3842e/imgui.h#L2555
• Uh-oh, it looks like these Anti-Alias settings, that are Turned On/Off via Styles are not implemented in .net wrapper:
  https://github.com/ocornut/imgui/blob/cb48c81a448aa0a4867e327c0a045a708ff3842e/imgui.h#L1867
  As we're drawing with Skia, can't we do something about it on Skia side, probably not, right?

[azeno]

@azeno I'm getting an Exception (.5 related not ImGui). The patch was working, I've saved it under another name.

Culprit is the apostrophe in the name. Upcoming versions will fix this.