BG effect on mousemove with BG image and javascript.

BG effect on onmousemove with BG image and javascript.

by Andrew Pougher

HTML

<span></span>

CSS

body{background-image:url(http:placehold.it/1900x1900/&text=andrew);background-size:cover}

JavaScript

var docbody = document.body;
var totalHeight = window.innerHeight;
var color1 = 'rgb(204, 204, 204)'; //  grey
var color2 = 'rgb(255, 66, 66)';   //  red!


function App() {

    this.init = function() {
		window.onmousemove = function( event ) {
    	var percentage = 1 - ( event.y / totalHeight );
			var color = fadeToColor(color1, color2, percentage)
			docbody.style.backgroundColor = color;
      $('span').html(color);
      }
      
      
      	function fadeToColor(rgbColor1, rgbColor2, ratio) {
	    var color1 = rgbColor1.substring(4, rgbColor1.length - 1).split(','),
	        color2 = rgbColor2.substring(4, rgbColor2.length - 1).split(','),
	        difference,
	        newColor = [];

	    for (var i = 0; i < color1.length; i++) {
	        difference = color2[i] - color1[i];
	        newColor.push(Math.floor(parseInt(color1[i], 10) + difference * ratio));
	    }

	    return 'rgba(' + newColor + ', 0.8)';
	}
  
  
      }
      }
      
      var app = new App();
app.init();

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  })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

  ga('create', 'UA-4809804-1', 'auto');
  ga('send', 'pageview');