\pstTriangle[PointSymbol=none]
            (3.5,1){A}(1,4){B}(5,4.2){C}
\psset{linecolor=red, CodeFigColor=red, nodesep=-1}
\pstMediatorAB[PointSymbolA=none]{A}{B}{I}{M_I}
\psset{PointSymbol=none, PointNameB=none}
\pstMediatorAB[CodeFig=true]
        {A}{C}{J}{M_J}
\pstMediatorAB[PosAngleA=45, linecolor=blue]
        {C}{B}{K}{M_K}