<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/arrows-for-technical-drawings" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Arrows for technical drawings" 
    allowfullscreen
></iframe>

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 12 / 10; width: 100%;" data-ar="12 / 10"></div>
</div>


 <textarea id="output" cols="70" rows="20"></textarea>
<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution 4.0 International License.
    https://creativecommons.org/licenses/by/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-8, 7, 4, -3],
        axis: true
    });
    
        var l = 5,
            insetRatio,
            tipAngle,
            wingCurve,
            tailCurve;
    
        insetRatio = board.create('slider', [[-6, 5.5], [0, 5.5], [0, 1, 2]], {name: 'inset ratio', snapWidth: 0.1});
        tipAngle = board.create('slider',   [[-6, 5],   [0, 5],   [0, 30, 90]], {name: 'tip angle', snapWidth: 1});
        wingCurve = board.create('slider',  [[-6, 4.5], [0, 4.5], [0, 0, 30]], {name: 'wing curve', snapWidth: 1});
        tailCurve = board.create('slider',  [[-6, 4],   [0, 4],   [0, 0, 40]], {name: 'tail curve', snapWidth: 1});
    
        var arrowhead = board.create('curve', [[], []], {strokeColor: 'blue', strokeOpacity: 0.4,
            fillColor: 'blue', fillOpacity: 0.4, strokeWidth: 10, lineCap: 'square'});
    
        arrowhead.updateDataArray = function() {
            var p = [],
                p2, f,
                ang, res,
                ang1, ang2,
                arr = [], arr2 = [],
                controls,
                ir = insetRatio.Value(),
                ta = tipAngle.Value(),
                wc = wingCurve.Value(),
                tc = tailCurve.Value();
    
            p.push([0, 0]);
            ang = 0.5 * ta * Math.PI / 180;
            p.push([-l / ir, l * Math.sin(ang) / Math.cos(ang)]);
            p.push([-l, 0]);
            p.push([p[1][0], -p[1][1]]);
    
            ang1 = Math.atan2(p[2][1] - p[1][1], p[2][0] - p[1][0]) * 180 / Math.PI + tc;
            if (tc === 0) {
                ang2 = [ang1, 180 - ang1];
            } else {
                ang2 = -90;
            }
            controls = {
                tension: 1,
                0: {direction: [0.5 * ta - wc, 180 - 0.5 * ta + wc]},
                1: {direction: [180 - 0.5 * ta - wc, ang1]},
                2: {direction: ang2},
                3: {direction: [180 - ang1, 0.5 * ta + wc]},
                isClosed: true
            };
    
            res = JXG.Math.Metapost.curve(p, controls);
            this.bezierDegree = 3;
            this.dataX = res[0];
            this.dataY = res[1];
    
            f = 10 / (p[0][0] - p[1][0]);
            p2 = p.map( z => [f * (z[0] - p[3][0]), f * (z[1] - p[3][1])] );
            res = JXG.Math.Metapost.curve(p2, controls);
            arr = res[0].map( (x, i) => [x.toFixed(2) + ',' + res[1][i].toFixed(2)] );
            arr2 = res[0].map( (x, i) => [(10-x).toFixed(2) + ',' + res[1][i].toFixed(2)] );
    
            document.getElementById('output').value =
                'insetRatio:' + ir + ' ' +
                'tipAngle:' + ta + ' ' +
                'wingCurve:' + wc + ' ' +
                'tailCurve:' + tc + '\n\n' +
                arr.join(' C ') + '\n\n' +
                arr2.join(' C ');
        };
    
        var li = board.create('segment', [[-10, 0], [0,0]], {strokeWidth: 10, strokeOpacity: 0.4});
        board.update();
    
 </script>