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<!DOCTYPE>
<head>
<style>
body {
border: 0px;
margin: 0px;
padding: 0px;
}
div {
border: 50px solid black;
margin: 50px;
padding: 50px;
}
table {
border-spacing: 0px;
}
</style>
</head>
<body>
<div>
<table>
<tr>
<td id="ul"></td>
<td id="ur"></td>
</tr>
<tr>
<td id="ll"></td>
<td id="lr"></td>
</tr>
</table>
</div>
<script>
var orientationInfo = location.search.substring(1).split("&");
var angle = parseInt(orientationInfo[0]);
var flip = orientationInfo[1] == "flip" ? true : false;
// Each id corresponds to a color.
var ids = ["ul", "ur", "lr", "ll"];
var colors = [
"rgb(0, 191, 0)",
"rgb(0, 255, 1)",
"rgb(254, 0, 122)",
"rgb(191, 0, 93)",
];
// 'Rotate' the colors according to the angle.
colors.unshift.apply(colors, colors.splice((360 - angle) / 90, colors.length));
// 'Flip' the colors if requested.
if (flip) {
var tmp = colors[0];
colors[0] = colors[1];
colors[1] = tmp;
tmp = colors[2];
colors[2] = colors[3];
colors[3] = tmp;
}
// Construct a style.
var style = "";
if (angle == 90 || angle == 270) {
style += "div { width: 200px; height: 100px; }\n";
style += "td { width: 100px; height: 50px; }\n";
} else {
style += "div { width: 100px; height: 200px; }\n";
style += "td { width: 50px; height: 100px; }\n";
}
for (var i = 0 ; i < 4 ; ++i) {
style += "#" + ids[i] + " { background-color: " + colors[i] + "; }\n";
}
// Apply the style to the document.
var sheet = document.createElement('style');
sheet.innerHTML = style;
document.body.appendChild(sheet);
</script>
</body>
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