npTUIOClient Tracker Example

https://github.com/fajran/npTuioClient/blob/master/example/tracker.html

by bman654

HTML

<script src="https://github.com/fajran/npTuioClient/raw/master/example/tuio.js"></script>
<canvas id="canvas" width="300" height="300" style="top:0px; left:0px; width: 300px; height: 300px;"></canvas>
<object id="tuio" type="application/x-tuio">Plugin FAILED to load</object>

CSS

canvas { border: 1px solid black; }

JavaScript

var canvas;
var ctx;
var w = 0;
var h = 0;

var timer;
var updateStarted = false;

function update() {
    if (updateStarted) return;
    updateStarted = true;

    var nw = window.innerWidth;
    var nh = window.innerHeight;

    if ((w != nw) || (h != nh)) {
        w = nw;
        h = nh;
        canvas.style.width = w+'px';
        canvas.style.height = h+'px';
        canvas.width = w;
        canvas.height = h;
    }

    ctx.clearRect(0, 0, w, h);

    var i, len = tuio.cursors.length;
    for (i=0; i<len; i++) {
        var obj = tuio.cursors[i];
        var x = obj.x;
        var y = obj.y;
        var px = x * w;
        var py = y * h;

        ctx.beginPath();
        ctx.arc(px, py, 20, 0, 2*Math.PI, true);

        ctx.fillStyle = "rgba(0, 0, 200, 0.2)";
        ctx.fill();

        ctx.lineWidth = 2.0;
        ctx.strokeStyle = "rgba(0, 0, 200, 0.8)";
        ctx.stroke();
    }

    updateStarted = false;
}

function ol() {
    canvas = document.getElementById('canvas');
    ctx = canvas.getContext('2d');
    timer = setInterval(update, 15);
};

$(ol);