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myersjustinc/inequality.js

Created November 8, 2011 23:10
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Using maphilight for a U.S. state choropleth map
Raw
inequality.js
// Naming everything under a main "choro" namespace isn't necessary, but it's a bit cleaner.
var choro = {};
choro.ctrl = {};
// One thing to keep in mind: In this data object, state names which normally have spaces
// continue to do so. In the image map (see map.html), they have underscores instead of
// spaces. (This is because the HTML class attribute treats spaces as separators so an
// element can have multiple classes.) This is why there are different .replace() calls
// throughout this script to add or remove the underscores as necessary.
choro.data = {
'District of Columbia': 0.540,
'New York': 0.499,
'Connecticut': 0.481,
'Louisiana': 0.477,
'Mississippi': 0.474,
'Texas': 0.474,
'Alabama': 0.471,
'California': 0.469,
'Massachusetts': 0.465,
'Tennessee': 0.468,
'Florida': 0.469,
'Georgia': 0.465,
'Kentucky': 0.462,
'New Jersey': 0.462,
'Rhode Island': 0.452,
'New Mexico': 0.458,
'Illinois': 0.465,
'Arkansas': 0.459,
'Virginia': 0.455,
'North Carolina': 0.463,
'South Carolina': 0.460,
'Oklahoma': 0.459,
'Pennsylvania': 0.457,
'West Virginia': 0.453,
'Colorado': 0.452,
'Arizona': 0.451,
'Missouri': 0.449,
'Michigan': 0.448,
'Ohio': 0.447,
'Oregon': 0.447,
'North Dakota': 0.443,
'Kansas': 0.442,
'Washington': 0.442,
'Maryland': 0.439,
'South Dakota': 0.439,
'Montana': 0.438,
'Delaware': 0.435,
'Minnesota': 0.435,
'Maine': 0.434,
'Indiana': 0.433,
'Nevada': 0.433,
'Nebraska': 0.430,
'Vermont': 0.430,
'Hawaii': 0.427,
'Idaho': 0.426,
'Iowa': 0.426,
'Wisconsin': 0.426,
'Wyoming': 0.424,
'New Hampshire': 0.418,
'Alaska': 0.411,
'Utah': 0.411
};
choro.ctrl.colorMap = function(quantity) {
// Colorbrewer Purples with five classes
// See http://colorbrewer2.org/ for other useful color schemes
if (quantity <= 0.433) {return 'f2f0f7';}
else if (quantity <= 0.443) {return 'cbc9e2';}
else if (quantity <= 0.457) {return '9e9ac8';}
else if (quantity <= 0.465) {return '756bb1';}
else {return '54278f';}
};
choro.ctrl.showChoropleth = function() {
// This actually colors the map. Here's how it works:
$('area').each(function() {
// The maphilight plugin looks for a jQuery data attribute on each region
// (state, in this case) in the image map. We use it here to set how we
// want each region to display.
$(this).data('maphilight', {
// We set the fill color for each state by looking up its name in our
// data object and passing the corresponding value to our colorMap
// function (above) to see what color to use.
fillColor: choro.ctrl.colorMap(choro.data[$(this).attr('class').replace(/_/g, ' ')]),
fillOpacity: 1,
strokeColor: 'aaaaaa',
fade: false,
alwaysOn: true
});
});
// We then call the maphilight plugin itself and tell it to treat all regions
// with the same class as if they were the same thing (which helps us deal with
// states that have islands or separate peninsulas).
$('#map_img').maphilight({
groupBy: 'class'
});
};
$(document).ready(function() {
// So we call that showChoropleth function to draw the map once the document
// has loaded...
choro.ctrl.showChoropleth();
// ...and then we add support for tooltips to show the state name and the
// value for that state.
// See http://cssglobe.com/post/1695/easiest-tooltip-and-image-preview-using-jquery
// for more details.
xOffset = 10;
yOffset = 20;
$('area').hover(function(e) {
$('#tooltip').remove();
var stateClass = $(this).attr('class');
var stateClassEscaped = stateClass.replace(/_/g, ' ');
$('body').append('<div id="tooltip">' +
'<h3>' + stateClassEscaped + '</h3>' +
'<div id="chart">' + '</div>' +
'<p>' + (choro.data[stateClassEscaped] * 100).toFixed(1) +
'</div>');
var tooltip = $('#tooltip');
if (e.pageX + tooltip.width() <= $('body').width()) {
tooltip.css('left', (e.pageX + yOffset) + 'px');
} else {
tooltip.css('left', (e.pageX - yOffset - tooltip.width()) + 'px');
}
if (e.pageY + tooltip.height() <= $('body').height()) {
tooltip.css('top', (e.pageY - xOffset) + 'px');
} else {
tooltip.css('top', (e.pageY - xOffset - tooltip.height()) + 'px');
}
}, function(e) {
$('#tooltip').remove();
});
$('area').mousemove(function (e) {
var tooltip = $('#tooltip');
if (e.pageX + tooltip.width() <= $('body').width()) {
tooltip.css('left', (e.pageX + yOffset) + 'px');
} else {
tooltip.css('left', (e.pageX - yOffset - tooltip.width()) + 'px');
}
if (e.pageY + tooltip.height() <= $('body').height()) {
tooltip.css('top', (e.pageY - xOffset) + 'px');
} else {
tooltip.css('top', (e.pageY - xOffset - tooltip.height()) + 'px');
}
});
});
Raw
main.css
body {
font-family: Arial, Helvetica, Tahoma, Verdana, sans-serif;
margin: 0;
padding: 0;
width: 460px;
}
h1 {font-size: 18pt;}
#legend {
margin: 5px auto;
font-size: 0.8em;
}
#legend td {padding: 7px ; width: 85px; color: white; margin: 7px; text-align: center;}
.legend_color {
border: 1px solid #aaa;
padding: 0 !important;
width: 25px;
}
.legend_num {margin: 0 10px 0 0;}
/* Colorbrewer Purples with five classes */
.legend_1 {background-color: #f2f0f7;}
.legend_2 {background-color: #cbc9e2;}
.legend_3 {background-color: #9e9ac8;}
.legend_4 {background-color: #756bb1;}
.legend_5 {background-color: #54278f;}
caption {
font-weight: bold;
font-size: 1.25em;
padding-bottom: 5px;
}
#year {
margin: 10px auto;
width: 460px;
}
#tooltip {
background-color: #fff;
border: 1px solid #ccc;
padding: 5px;
position: absolute;
width: 160px;
}
#tooltip h3 {
font-size: 14pt;
margin-top: 0;
text-align: center;
}
#tooltip p {
margin-bottom: 5px;
text-align: center;
}
.attribution {
font-size: 0.75em;
font-style: italic;
text-align: right;
text-transform: uppercase;
width: 460px;
}
.attribution a {text-decoration: none;}
Raw
map.html
<html>
<!-- See http://www.pbs.org/newshour/rundown/2011/10/which-cities-have-the-biggest-gaps-between-rich-and-poor.html for the article where this was used. -->
<head>
<title>Income Inequality by State</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<!-- Get jquery.maphilight.min.js here: http://davidlynch.org/projects/maphilight/ -->
<script type="text/javascript" src="jquery.maphilight.min.js"></script>
<script type="text/javascript" src="inequality.js"></script>
<link rel="stylesheet" type="text/css" href="main.css" />
</head>
<body>
<h1>Income Inequality by State</h1>
<!-- blank_480.png is just an empty (white) 480x297px image. Browsers generally won't show an image map without an image of some sort. You can add annotations in this image, which is handy. -->
<img src="blank_480.png" ismap="1" id="map_img" usemap="#map" />
<map name="map" id="map">
<!--
Map generated using svg2imagemap.py: http://davidlynch.org/blog/2008/03/creating-an-image-map-from-svg/
Source SVG was http://commons.wikimedia.org/wiki/File:Blank_US_Map.svg
-->
<area class="Hawaii" shape="polygon" coords="116,260, 117,258, 118,258, 118,258, 117,260, 116,260"></area>
<area class="Hawaii" shape="polygon" coords="121,258, 124,259, 125,259, 126,257, 126,255, 124,255, 122,256, 121,258"></area>
<area class="Hawaii" shape="polygon" coords="137,263, 138,266, 140,265, 140,265, 141,266, 143,266, 143,265, 142,264, 141,262, 140,260, 137,262, 137,263"></area>
<area class="Hawaii" shape="polygon" coords="147,267, 147,266, 150,267, 150,266, 153,267, 153,267, 152,268, 150,268, 147,267"></area>
<area class="Hawaii" shape="polygon" coords="149,270, 150,272, 152,271, 152,270, 151,269, 149,269, 149,270"></area>
<area class="Hawaii" shape="polygon" coords="153,269, 154,268, 156,269, 159,270, 161,271, 161,272, 159,273, 157,273, 155,273, 153,269"></area>
<area class="Hawaii" shape="polygon" coords="161,277, 162,276, 164,277, 168,279, 169,280, 170,281, 171,283, 173,285, 173,285, 171,287, 169,288, 168,287, 167,288, 165,290, 164,291, 163,291, 162,290, 161,288, 162,286, 161,284, 160,283, 160,281, 161,281, 162,279, 162,279, 161,278, 161,277"></area>
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<area class="Alaska" shape="polygon" coords="21,241, 22,244, 22,244, 21,244, 20,242, 19,241, 18,241, 17,240, 18,239, 19,240, 20,241, 21,241"></area>
<area class="Alaska" shape="polygon" coords="20,258, 22,258, 23,259, 24,259, 23,261, 21,261, 20,259, 20,258"></area>
<area class="Alaska" shape="polygon" coords="9,251, 10,252, 10,253, 10,253, 9,252, 9,251, 9,251"></area>
<area class="Alaska" shape="polygon" coords="2,288, 4,286, 6,286, 7,286, 7,287, 8,287, 9,286, 9,285, 11,285, 12,286, 11,287, 9,288, 8,288, 6,287, 4,288, 3,288, 2,288"></area>
<area class="Alaska" shape="polygon" coords="27,285, 28,286, 29,285, 28,285, 27,285"></area>
<area class="Alaska" shape="polygon" coords="28,287, 29,286, 30,286, 30,287, 28,287"></area>
<area class="Alaska" shape="polygon" coords="40,286, 41,287, 41,286, 41,285, 40,286"></area>
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<area class="Alaska" shape="polygon" coords="66,270, 67,269, 67,268, 66,268, 66,270"></area>
<area class="Florida" shape="polygon" coords="380,219, 381,223, 383,228, 385,233, 387,236, 390,239, 392,240, 393,242, 392,243, 392,243, 393,247, 395,248, 396,251, 398,254, 400,258, 401,262, 401,268, 401,269, 401,270, 400,271, 400,272, 400,273, 400,274, 400,275, 399,277, 397,278, 395,278, 394,279, 393,279, 393,279, 392,278, 392,277, 391,275, 390,273, 388,271, 386,271, 386,272, 384,270, 384,268, 382,266, 382,265, 381,266, 380,266, 379,264, 377,262, 376,259, 375,258, 373,256, 374,254, 375,252, 375,251, 373,250, 372,251, 372,251, 374,252, 373,254, 373,254, 372,252, 371,250, 371,248, 372,246, 372,241, 370,239, 369,238, 367,237, 366,237, 365,235, 363,235, 363,233, 361,232, 360,231, 358,230, 357,229, 355,229, 353,230, 353,230, 354,231, 353,232, 352,231, 350,233, 348,234, 346,234, 345,235, 345,233, 344,233, 342,232, 341,231, 337,229, 334,228, 331,229, 328,229, 325,230, 324,230, 324,226, 322,225, 321,224, 322,223, 327,222, 339,221, 343,220, 346,221, 347,223, 348,223, 352,224, 357,223, 368,223, 371,222, 373,222, 373,224, 374,224, 375,222, 374,220, 374,219, 377,219, 380,219"></area>
<area class="Florida" shape="polygon" coords="386,286, 387,285, 388,285, 389,284, 390,283, 390,284, 391,284, 392,284, 390,285, 388,286, 387,286, 386,286"></area>
<area class="Florida" shape="polygon" coords="393,283, 393,284, 395,283, 397,281, 399,279, 401,275, 401,275, 401,273, 401,273, 400,274, 400,277, 398,279, 396,282, 394,282, 393,283"></area>
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<area class="Michigan" shape="polygon" coords="349,88, 347,84, 346,80, 345,78, 344,77, 343,78, 341,79, 340,81, 338,83, 338,83, 337,83, 337,83, 336,82, 336,82, 336,82, 336,79, 336,79, 338,79, 338,77, 339,76, 340,75, 340,70, 339,69, 338,68, 338,67, 338,67, 339,67, 339,66, 338,65, 337,64, 336,64, 334,63, 331,61, 330,61, 329,62, 329,61, 327,60, 326,61, 324,62, 324,64, 325,64, 326,65, 326,65, 325,65, 324,66, 323,66, 323,67, 323,68, 323,71, 321,72, 321,72, 321,70, 322,69, 322,67, 322,67, 321,67, 320,70, 319,70, 318,71, 318,72, 318,72, 318,73, 317,74, 317,74, 317,75, 316,78, 316,80, 316,83, 316,83, 316,85, 316,85, 315,86, 317,89, 319,93, 319,95, 319,97, 319,100, 317,103, 317,104, 316,106, 318,106, 328,105, 332,104, 332,105, 336,104, 341,104, 343,103, 343,103, 343,102, 344,100, 345,100, 345,97, 346,96, 346,96, 346,94, 347,93, 347,93, 348,93, 348,94, 349,93, 349,88"></area>
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<table id="legend">
<caption>Gini index of income inequality</caption>
<tr>
<td class="legend_color legend_1" style="color:#444;"><strong>MOST EQUAL</strong> <br>&le; 43.3 </td>
<td class="legend_color legend_2">43.4-44.3</td>
<td class="legend_color legend_3">44.4-45.7</td>
<td class="legend_color legend_4">45.8 to 46.5</td>
<td class="legend_color legend_5"><strong>LEAST EQUAL</strong><br>&gt; 46.5</td>
</tr>
</table>
<p class="attribution">Source: <a href="http://www.census.gov/prod/2011pubs/acs-16.pdf" target="_blank">U.S. Census Bureau, "U.S. Neighborhood Income Inequality in the 2005&ndash;2009 Period"</a></p>
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