2D HUD drawing. Only valid inside a renderOverlay / HUD trigger, where JIM sets graphics to the frame's draw target (the 26.1.2 GuiGraphicsExtractor, i.e. the renamed GuiGraphics).
renderOverlay
GuiGraphicsExtractor
Coordinates are integers; colours are packed ARGB (use color).
Set by the HUD render hook for the duration of each frame's overlay dispatch.
Horizontal or vertical line (diagonals aren't supported by the HUD draw target).