How can i draw line on jetson tx2

In tegra_multimedia_api code,
nvosd.h define NvOSD_LineParams /NvOSD_ArrowParams,and nvosd_draw_arrows funcation,but not nvosd_draw_line,how can i draw line ?

Hi,
You may consider to upgrade to r32 releases. On r28 releases, please check
NvOSD_LineParams in L4T Multimedia API Reference 28.2 Release - #4 by DaneLLL