Created
January 9, 2017 05:27
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Color Scroll Background
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/* | |
* Name: Color Scroll | |
* Author: Amir R Muntasser | |
* Description: Change background color CSS property of body as you scroll. | |
* Dependencies: jQuery 1.4.2+ | |
* License: MIT License | |
*/ | |
var colors = $("#colorScroll").data("colors"); | |
var colors_array = colors.split(":"); | |
var numcolors = colors_array.length; | |
var RGBs = []; | |
for(var i = 0; i < numcolors; i++) { | |
RGBs[i] = []; | |
var c = colors_array[i].split(","); | |
RGBs[i][0] = c[0]; | |
RGBs[i][1] = c[1]; | |
RGBs[i][2] = c[2]; | |
} | |
var dRGBs = []; | |
for(var i = 0; i < (numcolors - 1); i++) { | |
dRGBs[i] = []; | |
dRGBs[i][0] = RGBs[i][0] - RGBs[i+1][0]; | |
dRGBs[i][1] = RGBs[i][1] - RGBs[i+1][1]; | |
dRGBs[i][2] = RGBs[i][2] - RGBs[i+1][2]; | |
} | |
$(window).scroll(function() { | |
var position = $(this).scrollTop(); | |
var view = $(this).height(); | |
var height = $(document).height(); | |
var travel = height - view; | |
var percent = position / travel; | |
var level = Math.floor(percent * (numcolors - 1)); | |
var plevel = percent * (numcolors - 1); | |
var dlevel = Math.floor(level); | |
if(Math.floor(level) == (numcolors - 1)) { | |
dlevel = Math.floor(level) - 1; | |
} | |
if(plevel > 1) { | |
plevel = plevel - dlevel; | |
} | |
var nRed = (RGBs[dlevel][0] - Math.round(dRGBs[dlevel][0] * plevel)); | |
var nGreen = (RGBs[dlevel][1] - Math.round(dRGBs[dlevel][1] * plevel)); | |
var nBlue = (RGBs[dlevel][2] - Math.round(dRGBs[dlevel][2] * plevel)); | |
$("body").css("background-color", "rgb(" + nRed + "," + nGreen + "," + nBlue + ")"); | |
}); |
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