Html_Graphics/pendulum.html at main · mertuarez/Html_Graphics · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<title>Hardcode</title>
<meta charset="utf-8"/>
<meta content="width=device-width, initial-scale=1" name="viewport"/>
<style>
 body {
  background: black;
 }
 canvas {
    display: block;
    margin: auto;
}
</style>
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script>
        var mIteration,canvas,l1,drawer;

        var v = 0; //velocity
        var t = 0; // time
        var L = 80; // pendulum length
        var g = 10; // gravity
        var m = 10; // mass
        var T = 2 * Math.PI * Math.sqrt(L/g); // period
        var k = g / m;
        var radian = Math.PI / 180;
        var theta0 = 50 * radian ; // amplitude

        function theta(theta0,t)
        {
            return theta0 * Math.cos(Math.sqrt(g / L) * t);

            //return theta0 * Math.pow(Math.E,t)
        }

        function draw() {

            t = t + 0.01;

            var theta1 = theta(theta0,-k*T*t/2);
            theta0 *= 0.999;

            var scX = canvas.width * 0.5;
            var scY = canvas.height * 0.5;
            var xO = L * Math.sin(theta1);
            var yO = L * Math.cos(theta1);


            var psX = scX + xO;
            var psY = scY + yO;

            l1.clearRect(0, 0, innerWidth, innerHeight);
            l1.fillStyle = "red";
            l1.strokeStyle = "#FF00ff";
            l1.beginPath();
            l1.moveTo(scX, scY);
            l1.lineTo(psX, psY);
            l1.stroke();
            l1.beginPath();
            l1.arc(psX, psY, m, 0, 2 * Math.PI);
            l1.stroke();
            l1.fill();
        }


    function init() {

        clearInterval(drawer);
        $("#mCanvas").remove();
        $(
        '<canvas id="mCanvas" width="640" height="480" style="">'
        ).appendTo($("body"));

        mIteration = 0;
        canvas = document.getElementById('mCanvas');
        l1 = canvas.getContext('2d');

        l1.font = "bold 80px Arial";
        l1.textAlign = 'center';
        l1.textBaseline = 'middle';
        l1.fillStyle = "#000000";
        l1.shadowOffsetX = 0;
        l1.shadowOffsetY = 0;
        l1.shadowColor = "#101010AA";
        l1.shadowBlur = 4;

        drawer=setInterval(draw, 10);
    }
/* --------------------------------- */


window.onclick = function (e) {
  //clearInterval(drawer);
  //$("#c").remove();
};

window.onload = init;
window.onresize = init;
</script>
</head>
<body>
</body>
</html>