# Difference between revisions of "Euler line source code"

Here is the source code cited in the paper Interactive Geometry for the web and mobile devices by Matthias Ehmann, Michael Gerhäuser, Carsten Miller, Heiko Vogel, Alfred Wassermann (2012).

The final construction looks like this

### JSXGraph code

<html>
<title>Euler line with JSXGraph</title>
href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript"
src="http://jsxgraph.uni-bayreuth.de/latest/jsxgraphcore.js"></script>
<body>
<div id="box_euler_line" class='jxgbox' style='width:600px; height:600px;'></div>
<script type='text/javascript'>

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

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

// Perpendiculars and orthocenter i1
var pABC = board.create('perpendicular', [pol.borders[0], C]),
pBCA = board.create('perpendicular', [pol.borders[1], A]),
pCAB = board.create('perpendicular', [pol.borders[2], B]),
i1 = board.create('intersection', [pABC, pCAB, 0]);

// Midpoints of segments
var mAB = board.create('midpoint', [A, B]),
mBC = board.create('midpoint', [B, C]),
mCA = board.create('midpoint', [C, A]);

// Line bisectors and and centroid i2
var ma = board.create('segment', [mBC, A]),
mb = board.create('segment', [mCA, B]),
mc = board.create('segment', [mAB, C]),
i2 = board.create('intersection', [ma, mc, 0]);

// Circum circle and circum center
var c = board.create('circumcircle', [A, B, C], {
strokeColor: '#000000',
dash: 3,
strokeWidth: 1,
center: {
name: 'i_3',
withlabel:true,
visible: true
}
});

// Euler line
var euler = board.create('line', [i1, i2], {
dash:1,
strokeWidth: 2,
strokeColor:'#901B77'
});

</script>
</body>
</html>


### JessieCode code

The smae example with JessieCode:

<html>
<title>Euler line with JSXGraph</title>
href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript"
src="http://jsxgraph.uni-bayreuth.de/latest/jsxgraphcore.js"></script>
<body>
<script type='text/jessiecode'>

\$board.setView([-1.5, 2, 1.5, -1]);

// Triangle ABC
A = point(1, 0);
B = point(-1, 0);
C = point(0.2, 1.5);
pol = polygon(A,B,C) <<
fillColor: '#FFFF00',
borders: <<
strokeWidth: 2,
strokeColor: '#009256'
>>
>>;

// Perpendiculars and orthocenter i1
pABC = perpendicular(pol.borders[0], C);
pBCA = perpendicular(pol.borders[1], A);
pCAB = perpendicular(pol.borders[2], B);
i1 = intersection(pABC, pCAB, 0);

// Midpoints of segments
mAB = midpoint(A, B);
mBC = midpoint(B, C);
mCA = midpoint(C, A);

// Line bisectors and centroid i2
ma = segment(mBC, A);
mb = segment(mCA, B);
mc = segment(mAB, C);
i2 = intersection(ma, mc, 0);

// Circum circle and circum center
c = circumcircle(A, B, C) <<
strokeColor: '#000000',
dash: 3,
strokeWidth: 1,
center: <<
name: 'i_3',
withlabel:true,
visible: true
>>
>>;

// Euler line
euler = line(i1, i2) <<
dash:1,
strokeWidth: 2,
strokeColor:'#901B77'
>>;

</script>
</body>
</html>