Euler line

The JavaScript code

(function () {

    var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-1.5, 2, 1.5, -1], keepaspectratio:true});

    var cerise = {
            strokeColor: '#901B77',
            fillColor: '#CA147A'
        },

        grass = {
            strokeColor: '#009256',
            fillColor: '#65B72E',
            visible: true,
            withLabel: true
        },

        perpendicular = {
            strokeColor: 'black',
            dash: 1,
            strokeWidth: 1,
            point: JXG.deepCopy(cerise, {
                visible: true,
                withLabel: true
            })
        },

        median = {
            strokeWidth: 1,
            strokeColor: '#333333',
            dash:2
        },

        A = board.create('point', [1, 0], cerise),
        B = board.create('point', [-1, 0], cerise),
        C = board.create('point', [0.2, 1.5], cerise),
        pol = board.create('polygon',[A,B,C], {
            fillColor: '#FFFF00',
            lines: {
                strokeWidth: 2,
                strokeColor: '#009256'
            }
        });

    var pABC, pBCA, pCAB, i1;
    perpendicular.point.name = 'H_c';
    pABC = board.create('perpendicular', [pol.borders[0], C], perpendicular);
    perpendicular.point.name = 'H_a';
    pBCA = board.create('perpendicular', [pol.borders[1], A], perpendicular);
    perpendicular.point.name = 'H_b';
    pCAB = board.create('perpendicular', [pol.borders[2], B], perpendicular);
    grass.name = 'H';
    i1 = board.create('intersection', [pABC, pCAB, 0], grass);

    var mAB, mBC, mCA;
    cerise.name = 'M_c';
    mAB = board.create('midpoint', [A, B], cerise);
    cerise.name = 'M_a';
    mBC = board.create('midpoint', [B, C], cerise);
    cerise.name = 'M_b';
    mCA = board.create('midpoint', [C, A], cerise);

    var ma, mb, mc, i2;
    ma = board.create('segment', [mBC, A], median);
    mb = board.create('segment', [mCA, B], median);
    mc = board.create('segment', [mAB, C], median);
    grass.name = 'S';
    i2 = board.create('intersection', [ma, mc, 0], grass);

    var c;
    grass.name = 'U';
    c = board.create('circumcircle',[A, B, C], {
        strokeColor: '#000000',
        dash: 3,
        strokeWidth: 1,
        point: grass
    });

    var euler;
    euler = board.create('line', [i1, i2], {
        strokeWidth: 2,
        strokeColor:'#901B77'
    });
    board.update();
})();