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Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <canvas id="space"></canvas>
<div id="info">
  <h1>StringArt avec FESC</h1>
  <p>
    Devenez vous aussi un artiste numérique ;)<br>
    Rr: <span id="r"></span> G: <span id="g"></span> B: <span id="b"></span> x: <span id="x"></span> y: <span id="y"></span><br>
    Cliquez sur l'image pour générer votre oeuvre d'art numérique interactive !
  </p>
</div>
              
            
!

CSS

              
                html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body{
  position: relative;
  background-color: #333333;
}

#info {
  position: absolute;
  top: 0px;
  left: 0px;
  margin: 12px 0 0 12px;
}
h1 {
  color: #eeeeee;
  font-size: 21px;
  font-weight: normal;
  margin: 0;
}
p, a {
  margin: 3px 0 0 0;
  color: #cccccc;
  font-size: 13px;
  line-height: 20px;
}
p span {
  display: inline-block;
  width: 25px;
  color: #ffffff;
}
              
            
!

JS

              
                var main = (function () {
	
	var canvas, ctx;
	var deg360 = Math.PI*2;
  var r, g, b;
  var dom = {};
  var count = 0;
  var last = 5;
	var latency = 5;
  var points = [];
  
	var randomRange = function (min, max) {
		return min + Math.random() * (max - min);
	};
    
	var randomRangeInt = function (min, max) {
		return Math.round(randomRange(min, max));
	}
	
	var cropInt = function (min, max, int) {
		return Math.min(max, Math.max(min, int));
	}
	
	var colorCompChange = function (colorComp) {
		return cropInt(50, 200, colorComp + randomRangeInt(-15, 15));
	}
  
  var circle = function (x, y, r, c) {
    ctx.beginPath();
    ctx.moveTo(x,y);
    ctx.arc(x, y, r, 0, deg360, false);
    ctx.fillStyle = 'rgb(' + c.join(',') + ')';
    ctx.fill();
  };
  
  var line = function (sx, sy, ex, ey, w, c) {
    ctx.beginPath();
    ctx.moveTo(sx, sy);
    ctx.lineTo(ex, ey);
    ctx.lineWidth = 1;
    ctx.strokeStyle = 'rgba(' + c.join(',') + ', 0.5)';
    ctx.stroke();
  };
  
  var drawNextPoint = function (x, y) {
    // update color components
    r = colorCompChange(r);
    g = colorCompChange(g);
    b = colorCompChange(b);
    
    // display corrdinates and color components
    var v = {x:x, y:y, r:r, g:g, b:b};
    for (var k in v)
      dom[k].innerHTML = v[k];
    
    // draw current point
    circle(x, y, 3, [r, g, b]);
    
		// connect to last 5 points
		for (var i = 0; i < points.length; i++) {
      var w = randomRange(0.2, 3);
      line(x, y, points[i].x, points[i].y, w, [r, g, b]);
		}
		
		// (re)set the last 5 points
    if (points.length > last) {
			points.splice(0, 1);
    }
		points.push( { x: x, y: y } );
  };
  
  var startOver = function () {
    points = [];
    ctx.clearRect (0, 0, canvas.width, canvas.height);
  };
  
  var demoCount = 0;
  var demo = function () {
    demoCount++;
    var x, y;
    if (points.length==0) {
      x = 240;
      y = 80;
    } else {
      x = points[points.length-1].x;
      y = points[points.length-1].y;
    }
		x = cropInt(0, canvas.width, x + randomRangeInt(-35, 35));
		y = cropInt(0, canvas.height, y + randomRangeInt(-35, 35));
    drawNextPoint(x, y);
    if (demoCount < 100) {
      setTimeout(arguments.callee, 1000/60);
    }
  };
  
  var start = function () {
    canvas = document.getElementById('space');
    canvas.width  = window.innerWidth;
    canvas.height = window.innerHeight;
    ctx = canvas.getContext('2d');
    
    var spans = 'rgbxy';
    for (var i=0; i<spans.length; i++)
      dom[spans[i]] = document.getElementById(spans[i]);
    
		r = randomRangeInt(50, 200);
		g = randomRangeInt(50, 200);
		b = randomRangeInt(50, 200);
    
    canvas.addEventListener('click', startOver, false);
    canvas.addEventListener('mousemove', function (e) {
			count++;
      if (count % latency == 0) {
				drawNextPoint(e.clientX, e.clientY);
      }
    }, false);
    
    demo();
  };
  
  // domReady
  if (document.addEventListener) {
    document.addEventListener('DOMContentLoaded', function () {
      document.removeEventListener('DOMContentLoaded', arguments.callee, false);
      setTimeout(start, 60);
    }, false );
  }
  
})();

              
            
!
999px

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