vdgfx where can i find more info

Hardware MKR Family MKRVIDOR4000
1

// vdgfx.fillCircle(225,225,100 ,vdgfx.lightBlue());
// vdgfx.fillCircle(415,225,100 ,vdgfx.lightBlue());
// vdgfx.fillCircle(225,225,90 ,vdgfx.White());
// vdgfx.fillCircle(415,225,90 ,vdgfx.White());
// vdgfx.fillRect(175,220,100,10 ,vdgfx.lightBlue());
// vdgfx.fillRect(365,220,100,10 ,vdgfx.lightBlue());
// vdgfx.fillRect(410,175,10,100 ,vdgfx.lightBlue());

all this works
now looking how do i draw a line for example