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              <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <title>Html page</title>
    <script src="https://cdn.rawgit.com/lingtalfi/simpledrag/master/simpledrag.js"></script>
    <style>
        body {
            position: fixed;
            width: 100%;
            height: 100%;
            background: #eee;
        }

        .ui {
            display: flex;
        }

        .ui > div {
            margin: 0 10px;
        }

        .ui .controls input {
            vertical-align: middle;
        }

        #circle1, #circle2 {
            cursor: pointer;
        }

        svg {
            background: #ddd;
        }
    </style>
</head>

<body>
<div class="ui">
    <div class="controls">
        Radius X: <input id="rx" type="range" min="0" max="500"/><br>
        Radius Y: <input id="ry" type="range" min="0" max="500"/><br>
        Rotation: <input id="rot" type="range" min="0" max="360" value="0"/><br>
        Large arc flag: <input id="laf" type="checkbox"/><br>
        Sweep flag: <input id="sf" type="checkbox"/><br>
        Arc command: <span id="arcvalue"></span><br>
    </div>
    <div class="results">
        mouse: pageX <span id="pagex"></span>, <span pageY id="pagey"></span><br>
        A: <span id="axvalue"></span>, <span id="ayvalue"></span><br>
        B: <span id="bxvalue"></span>, <span id="byvalue"></span><br>
        m: <span id="mvalue"></span><br>
        b(A): <span id="bavalue"></span><br>
        b(B): <span id="bbvalue"></span><br>
        contextWidth: <span id="cwvalue"></span><br>

    </div>
</div>

<svg width="100%" height="100%" id="svgcontext">

    <path id="arc2" d=""
          fill="none" stroke="green" stroke-width="2"
    ></path>
    <path id="arc3" d=""
          fill="none" stroke="green" stroke-width="2"
    ></path>
    <path id="arc4" d=""
          fill="none" stroke="green" stroke-width="2"
    ></path>

    <path id="arc" d="M100 100 A 100 100 0 1 0 200 100"
          fill="none" stroke="red" stroke-width="4"
    ></path>

    <line id="line0" x1="0" y1="0" x2="0" y2="0" fill="none" stroke="black" stroke-width="2"></line>
    <line id="line" x1="0" y1="0" x2="0" y2="0" fill="none" stroke="black" stroke-width="2"></line>
    <line id="line2" x1="0" y1="0" x2="0" y2="0" fill="none" stroke="black" stroke-width="2"></line>

    <circle id="circle1" cx="100" cy="100" r="5"
            fill="red"
            stroke="red"
            stroke-width="2"
    ></circle>

    <circle id="circle2" cx="200" cy="100" r="5"
            fill="red"
            stroke="red"
            stroke-width="2"
    ></circle>


</svg>

<script type="text/javascript">









    var svgContext = document.getElementById('svgcontext');
    var rect = svgContext.getBoundingClientRect(); // helper to enclose mouse coordinates into svg box


    var pagexEl = document.getElementById('pagex');
    var pageyEl = document.getElementById('pagey');
    var mEl = document.getElementById('mvalue');
    var rxEl = document.getElementById('rx');
    var ryEl = document.getElementById('ry');
    var rotEl = document.getElementById('rot');
    var lafEl = document.getElementById('laf');
    var sfEl = document.getElementById('sf');
    var axEl = document.getElementById('axvalue');
    var ayEl = document.getElementById('ayvalue');
    var bxEl = document.getElementById('bxvalue');
    var byEl = document.getElementById('byvalue');
    var baEl = document.getElementById('bavalue');
    var bbEl = document.getElementById('bbvalue');
    var circle1 = document.getElementById('circle1');
    var circle2 = document.getElementById('circle2');
    var line = document.getElementById('line');
    var line0 = document.getElementById('line0');
    var line2 = document.getElementById('line2');
    var cwEl = document.getElementById('cwvalue');
    var arcCmdEl = document.getElementById('arcvalue');
    var arcEl = document.getElementById('arc');
    var arc2El = document.getElementById('arc2');
    var arc3El = document.getElementById('arc3');
    var arc4El = document.getElementById('arc4');


    function updatePaths(pageX, pageY) {

        pagexEl.textContent = pageX;
        pageyEl.textContent = pageY;


//        cwEl.textContent = pageY;


        // line between two points
        line.setAttribute("x1", circle1.getAttribute('cx'));
        line.setAttribute("y1", circle1.getAttribute('cy'));
        line.setAttribute("x2", circle2.getAttribute('cx'));
        line.setAttribute("y2", circle2.getAttribute('cy'));


        axEl.textContent = circle1.getAttribute('cx');
        ayEl.textContent = circle1.getAttribute('cy');
        bxEl.textContent = circle2.getAttribute('cx');
        byEl.textContent = circle2.getAttribute('cy');


        // y = mx + b
        var m, b, run; // m = rise/run = (y2-y1) / (x2-x1)
        if (circle1.getAttribute('cx') <= circle2.getAttribute('cx')) {
            run = (circle2.getAttribute('cx') - circle1.getAttribute('cx'));
            if (0 !== run) {
                m = (circle2.getAttribute('cy') - circle1.getAttribute('cy')) / run;
            }
        }
        else {
            run = (circle1.getAttribute('cx') - circle2.getAttribute('cx'));
            if (0 !== run) {
                m = (circle1.getAttribute('cy') - circle2.getAttribute('cy')) / run;
            }
        }

        if (0 !== run) {
            // b = y - mx
            b = circle1.getAttribute('cy') - m * circle1.getAttribute('cx');
            b2 = circle2.getAttribute('cy') - m * circle2.getAttribute('cx');
            baEl.textContent = b;
            bbEl.textContent = b2;
            mEl.textContent = m;

            // draw segment from the left vertical axis (x=0) to the left most point (A or B).
            // x=0 ----> y = b
            var leftMost, rightMost;
            if (circle1.getAttribute('cx') <= circle2.getAttribute('cx')) {
                leftMost = circle1;
                rightMost = circle2;
            }
            else {
                leftMost = circle2;
                rightMost = circle1;
            }


            line0.setAttribute("x1", 0);
            line0.setAttribute("y1", b);
            line0.setAttribute("x2", leftMost.getAttribute('cx'));
            line0.setAttribute("y2", leftMost.getAttribute('cy'));

            // draw segment from point B to the right vertical axis (x=rect.width) representing the end of the svg box.
            // y = mx + b
            var y = m * rect.width + b;
            line2.setAttribute("x1", rightMost.getAttribute('cx'));
            line2.setAttribute("y1", rightMost.getAttribute('cy'));
            line2.setAttribute("x2", rect.width);
            line2.setAttribute("y2", y);

            // now update the arc
            var arcCmd = getArcCommand(leftMost, rightMost, lafEl.checked, sfEl.checked);
            arcCmdEl.textContent = arcCmd;
            arcEl.setAttribute('d', arcCmd);

            // now update the other helper arcs
            var combo = [
                [true, true],
                [true, false],
                [false, true],
                [false, false],
            ].filter(function (item) {
                if (item[0] === lafEl.checked && item[1] === sfEl.checked) {
                    return false;
                }
                return true;
            });
            arc2El.setAttribute('d', getArcCommand(leftMost, rightMost, combo[0][0], combo[0][1]));
            arc3El.setAttribute('d', getArcCommand(leftMost, rightMost, combo[1][0], combo[1][1]));
            arc4El.setAttribute('d', getArcCommand(leftMost, rightMost, combo[2][0], combo[2][1]));


        }
    }

    function getArcCommand(leftMost, rightMost, lafChecked, sfChecked) {
        return "M" + leftMost.getAttribute('cx') + " " + leftMost.getAttribute('cy')
                + " A " + rxEl.value + " " + ryEl.value + " " + rotEl.value + " "
                + (true === lafChecked ? "1" : "0") + " " + (true === sfChecked ? "1" : "0")
                + " " + rightMost.getAttribute('cx') + " " + rightMost.getAttribute('cy');
    }

    function updateScreen() {
        rect = svgContext.getBoundingClientRect();
        cwEl.textContent = rect.width;
    }


    circle1.sdrag(function (el, pageX, startX, pageY, startY) {

        pageX -= rect.left;
        pageY -= rect.top;

        el.setAttribute('cx', pageX);
        el.setAttribute('cy', pageY);
        updatePaths(pageX, pageY);
    });

    circle2.sdrag(function (el, pageX, startX, pageY, startY) {

        pageX -= rect.left;
        pageY -= rect.top;

        el.setAttribute('cx', pageX);
        el.setAttribute('cy', pageY);
        updatePaths(pageX, pageY);
    });

    window.addEventListener('resize', updateScreen);


    // sliders
    ['rx', 'ry', 'rot'].forEach(function (id) {
        document.getElementById(id).addEventListener('input', function (e) {
            updatePaths();
        });
    });

    // checkboxes
    ['laf', 'sf'].forEach(function (id) {
        document.getElementById(id).addEventListener('change', function (e) {
            updatePaths();
        });
    });


    updatePaths();
    updateScreen();


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