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<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test-pre.js"></script>
<script src="../resources/subpixel-utils.js"></script>
<style>
#container-border {
border: 1px solid black;
margin: 10px;
width: 500px;
}
#container {
font: 20px/1 Ahem, sans-serif;
width: 500px;
height: 300px;
}
#float-left {
float: left;
position: relative;
overflow: visible;
-webkit-shape-outside: ellipse(200px 100px at 225px 125px);
-webkit-shape-margin: 25px;
width: 450px;
height: 250px;
}
#svg-shape-ellipse {
position: absolute;
display:block;
top: 0px;
left: 0px;
width: 500px;
height: 300px;
}
</style>
<body>
<p>The left edges of the three black squares should follow the outer ellipse boundary and each square should appear on a subsequent line.</p>
<div id="container-border">
<div id="container">
<div id="float-left">
<svg id="svg-shape-ellipse" xmlns="http://www.w3.org/2000/">
<ellipse cx="225" cy="125" rx="200" ry="100" fill="green"></ellipse>
<ellipse cx="225" cy="125" rx="225" ry="125" fill="none" stroke="green"></ellipse>
</svg>
</div>
<span id="s1">X</span></br><span id="s2">X</span><br/><span id="s3">X</span>
</div>
</div>
<div id="console"></div>
</body>
<script>
function elementRect(elementId)
{
var s = document.getElementById("container").getBoundingClientRect();
var r = document.getElementById(elementId).getBoundingClientRect();
return {left: Math.round(r.left) - Math.round(s.left), top: Math.round(r.top) - Math.round(s.top), width: Math.round(r.width), height: Math.round(r.height)};
}
// You'll find the equation for the X intercept of an elliptical arc here (among other places):
// http://hansmuller-webkit.blogspot.com/2012/07/computing-horizonal-rounded-rectangle.html
function marginEllipseLeftXIntercept(y, cx, rx, ry)
{
var f = SubPixelLayout.snapToLayoutUnit(cx + rx * Math.sqrt(1 - Math.pow((ry - y) / ry, 2)));
return String( Math.round(f) );
}
// In the ".left" tests below, it's the lower edge of the 20px Ahem glyph that that defines the element rect's left edge.
// That's why the Y coordinate in each of those tests is 20 greater than the ".top" test.
var quiet = true; // PASS output depends on SubPixelLayout.isEnabled()
shouldBe("elementRect('s1').top", "0");
shouldBe("elementRect('s1').left", marginEllipseLeftXIntercept(20, 225, 225, 125), quiet);
shouldBe("elementRect('s2').top", "20");
shouldBe("elementRect('s2').left", marginEllipseLeftXIntercept(40, 225, 225, 125), quiet);
shouldBe("elementRect('s3').top", "40");
shouldBe("elementRect('s3').left", marginEllipseLeftXIntercept(60, 225, 225, 125), quiet);
</script>
</html>