\starttext

\startMPpage[offset=1mm]

    draw image (
        drawarrow (1cm,0cm) -- (0cm,0cm) withcolor .5red withtransparency(1,.5)  ;
    ) shifted (0,-0mm) ;

    draw image (
        drawarrow (1cm,0cm) -- (0cm,0cm) withcolor .5green withtransparency(1,.5)  ;
    ) shifted (0,-2mm) asgroup "" ;

    draw image (
        drawarrow (1cm,0cm) -- (0cm,0cm) withcolor .5blue withtransparency(1,.5)  ;
    ) shifted (0,-4mm) asgroup "isolated" ;

    draw image (
        drawarrow (1cm,0cm) -- (0cm,0cm) withcolor .5cyan withtransparency(1,.5)  ;
    ) shifted (0,-6mm) asgroup "knockout" ;

    draw image (
        drawarrow (1cm,0cm) -- (0cm,0cm) withcolor .5magenta withtransparency(1,.5)  ;
    ) shifted (0,-8mm) asgroup "isolated,knockout" ;

    addbackground withcolor .5white ;

\stopMPpage

\stoptext
