notlion/cinder-nanovg

A C++11 wrapper for NanoVG meant for use with Cinder

cinder-nanovg's Issues

Context handling in multi-window?

Is an NV context coupled to a GL context? I'm trying to use Cinder-NanoVG for general UI components and want to better understand the scope and management of the NV Context being drawn into.

Font rendering with Cinder-imGui

I'm compiling some code with both Cinder-NanoVG and Cinder-imGui blocks, but the font rendering in imGui became solid blocks as soon as NanoVG is rendering stuff.

Do you have any ideas on resolving this problem?

Best,
origamidance.

position of text drawn

When I draw a string(text) using : ctx->text(pos,text) and choose for example
(0,0) as the position the resulting text rect drawn does not have that position.
In case of (0,0) it gets negative x,y values.

To force the text to be drawn at the intended position I can do:

    // setup preferred position and text
    vec2 intendedPos{0,0};
    string text{"this is a test"};
    Rectf r = ctx->textBounds(0, 0, text);

    // correct text pos
    vec2 correctedPos{intendedPos.x - r.x1, intendedPos.y - r.y1} ;
    // correct rect
    r = ctx->textBounds(correctedPos.x, correctedPos.y, text);

    // draw Text
    ctx->beginPath();
    ctx->fillColor(ColorAf{0.2, 0.2, 0.2});
    ctx->text(correctedPos,text);

Is this intended behaviour or a bug? I believe what's confusing about this is that it behaves
unexpected in context of other cinder stuff.

Texture Proxy Motivation

This is a great wrapper! The shapes look so nice. I'm really looking forward to diving in deeper.

I added a simple ci::Timer to get the number of milliseconds spent per frame in the RenderToTexture sample, and found that the NanoVG performance is generally better than the Texture Proxy performance (on a Mac Pro w/ AMD Firepro card). When running in Release with 512 shapes, I see the following frame times:

Texture Proxies: ~10.0 ms
NanoVG:          ~ 2.8 ms

My guess is that the proxies aren't really worth it unless the underlying shape is very complex.