;; use nvgArcTo (bind-func xtm_draw_arc_stroke (lambda (path x1:i64 y1:i64 x2:i64 y2:i64 x3:i64 y3:i64 rad:i64 color:NVGcolor* width:i64) (nvgBeginPath path) (xtm_add_arc path x1 y1 x2 y2 x3 y3 rad) (xtm_stroke path color width)))