\psset{CodeFig=true, PointSymbol=none} \pstTriangle[PosAngleA=180] (-1,0){A}(3,-1){B}(3,2){C} \pstProjection[PosAngle=-90]{B}{A}{C} \pstProjection{B}{C}{A} \pstProjection[PosAngle=90]{A}{C}{B} \pstInterLL[PosAngle=135,PointSymbol=square] {A}{A'}{B}{B'}{H}