Grid control NOTE: Returns grid mouse-hover selected cell About drawing lines at subpixel spacing, simple put, not easy solution: https://stackoverflow.com/questions/4435450/2d-opengl-drawing-lines-that-dont-exactly-fit-pixel-raster
See Implementation
Grid control NOTE: Returns grid mouse-hover selected cell About drawing lines at subpixel spacing, simple put, not easy solution: https://stackoverflow.com/questions/4435450/2d-opengl-drawing-lines-that-dont-exactly-fit-pixel-raster