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* Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
* for details. All rights reserved. Use of this source code is governed by a
* BSD-style license that can be found in the LICENSE file.
* @assertion
* @description
import "dart:html";
import "dart:math" as Math;
import "../../../testharness.dart";
import "../resources/subpixel-utils.dart" as SubPixelLayout;
const String htmlEL1 = r'''
#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;
shape-outside: ellipse(200px 100px at 225px 125px);
shape-margin: 25px;
width: 450px;
height: 250px;
#svg-shape-ellipse {
position: absolute;
top: 0px;
left: 0px;
width: 500px;
height: 300px;
const String htmlEL2 = r'''
<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="">
<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>
<span id="s1">X</span></br><span id="s2">X</span><br/><span id="s3">X</span>
<div id="console"></div>
Rectangle elementRect(elementId) {
Rectangle s = document.getElementById("container").getBoundingClientRect();
Rectangle r = document.getElementById(elementId).getBoundingClientRect();
return new Rectangle(r.left - s.left, -, r.width, r.height);
// You'll find the equation for the X intercept of an elliptical arc here (among other places):
String marginEllipseLeftXIntercept(y, cx, rx, ry) {
var f = SubPixelLayout.snapToLayoutUnit(cx + rx * Math.sqrt(1 - Math.pow((ry - y) / ry, 2)));
return f.round().toString();
// 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.
void main() {
document.head.appendHtml(htmlEL1, treeSanitizer: new NullTreeSanitizer());
document.body.appendHtml(htmlEL2, treeSanitizer: new NullTreeSanitizer());
shouldBe(elementRect('s1').top, 0);
shouldBe(elementRect('s1').left, marginEllipseLeftXIntercept(20, 225, 225, 125));
shouldBe(elementRect('s2').top, 20);
shouldBe(elementRect('s2').left, marginEllipseLeftXIntercept(40, 225, 225, 125));
shouldBe(elementRect('s3').top, 40);
shouldBe(elementRect('s3').left, marginEllipseLeftXIntercept(60, 225, 225, 125));