13 KiB
13 KiB
| id | title | required | challengeType | videoUrl | localeTitle | |||
|---|---|---|---|---|---|---|---|---|
| 587d7fac367417b2b2512bde | Use a Pre-Defined Scale to Place Elements |
|
6 | 使用预定义比例放置元素 |
Description
rect或text元素的x和y属性，或者circles cx和cy 。这是一个例子： 形状Scales设置形状坐标属性以将数据点放置到SVG画布上。显示实际数据值时不需要应用比例，例如，在工具提示或标签的
.attr（“x”，（d）=> xScale（d [0]））
text()方法中。 Instructions
xScale和yScale将circle和text形状定位到SVG画布上。对于circles ，应用比例来设置cx和cy属性。给它们半径5个单位。对于text元素，应用比例来设置x和y属性。标签应偏移到点的右侧。要执行此操作，请在将x数据传递给xScale之前将其添加10个单位。 Tests
tests:
- text: 您的代码应该有10个<code>circle</code>元素。
testString: 'assert($("circle").length == 10, "Your code should have 10 <code>circle</code> elements.");'
- text: 应用刻度后，第一个<code>circle</code>元素应具有大约91的<code>cx</code>值和大约368的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(0).attr("cx")) == "91" && Math.round($("circle").eq(0).attr("cy")) == "368" && $("circle").eq(0).attr("r") == "5", "The first <code>circle</code> element should have a <code>cx</code> value of approximately 91 and a <code>cy</code> value of approximately 368 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第二个<code>circle</code>元素的<code>cx</code>值应约为159， <code>cy</code>值应约为181。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(1).attr("cx")) == "159" && Math.round($("circle").eq(1).attr("cy")) == "181" && $("circle").eq(1).attr("r") == "5", "The second <code>circle</code> element should have a <code>cx</code> value of approximately 159 and a <code>cy</code> value of approximately 181 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第三个<code>circle</code>元素应具有约340的<code>cx</code>值和约329的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(2).attr("cx")) == "340" && Math.round($("circle").eq(2).attr("cy")) == "329" && $("circle").eq(2).attr("r") == "5", "The third <code>circle</code> element should have a <code>cx</code> value of approximately 340 and a <code>cy</code> value of approximately 329 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第四个<code>circle</code>元素应具有大约131的<code>cx</code>值和大约60的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(3).attr("cx")) == "131" && Math.round($("circle").eq(3).attr("cy")) == "60" && $("circle").eq(3).attr("r") == "5", "The fourth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 60 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第五个<code>circle</code>元素应具有大约440的<code>cx</code>值和大约237的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(4).attr("cx")) == "440" && Math.round($("circle").eq(4).attr("cy")) == "237" && $("circle").eq(4).attr("r") == "5", "The fifth <code>circle</code> element should have a <code>cx</code> value of approximately 440 and a <code>cy</code> value of approximately 237 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第六个<code>circle</code>元素应具有约271的<code>cx</code>值和约306的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(5).attr("cx")) == "271" && Math.round($("circle").eq(5).attr("cy")) == "306" && $("circle").eq(5).attr("r") == "5", "The sixth <code>circle</code> element should have a <code>cx</code> value of approximately 271 and a <code>cy</code> value of approximately 306 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第七个<code>circle</code>元素的<code>cx</code>值约为361， <code>cy</code>值约为351。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(6).attr("cx")) == "361" && Math.round($("circle").eq(6).attr("cy")) == "351" && $("circle").eq(6).attr("r") == "5", "The seventh <code>circle</code> element should have a <code>cx</code> value of approximately 361 and a <code>cy</code> value of approximately 351 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第八个<code>circle</code>元素应具有约261的<code>cx</code>值和约132的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(7).attr("cx")) == "261" && Math.round($("circle").eq(7).attr("cy")) == "132" && $("circle").eq(7).attr("r") == "5", "The eighth <code>circle</code> element should have a <code>cx</code> value of approximately 261 and a <code>cy</code> value of approximately 132 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第九个<code>circle</code>元素应具有大约131的<code>cx</code>值和大约144的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(8).attr("cx")) == "131" && Math.round($("circle").eq(8).attr("cy")) == "144" && $("circle").eq(8).attr("r") == "5", "The ninth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 144 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 应用刻度后，第十个<code>circle</code>元素应具有大约79的<code>cx</code>值和大约326的<code>cy</code>值。它的<code>r</code>值也应为5。
testString: 'assert(Math.round($("circle").eq(9).attr("cx")) == "79" && Math.round($("circle").eq(9).attr("cy")) == "326" && $("circle").eq(9).attr("r") == "5", "The tenth <code>circle</code> element should have a <code>cx</code> value of approximately 79 and a <code>cy</code> value of approximately 326 after applying the scales. It should also have an <code>r</code> value of 5.");'
- text: 您的代码应该有10个<code>text</code>元素。
testString: 'assert($("text").length == 10, "Your code should have 10 <code>text</code> elements.");'
- text: 应用刻度后，第一个标签的<code>x</code>值约为100， <code>y</code>值约为368。
testString: 'assert(Math.round($("text").eq(0).attr("x")) == "100" && Math.round($("text").eq(0).attr("y")) == "368", "The first label should have an <code>x</code> value of approximately 100 and a <code>y</code> value of approximately 368 after applying the scales.");'
- text: 第二标签应该有一个<code>x</code>的大约168值和<code>y</code>施加鳞后的约181的值。
testString: 'assert(Math.round($("text").eq(1).attr("x")) == "168" && Math.round($("text").eq(1).attr("y")) == "181", "The second label should have an <code>x</code> value of approximately 168 and a <code>y</code> value of approximately 181 after applying the scales.");'
- text: 应用刻度后，第三个标签的<code>x</code>值约为350， <code>y</code>值约为329。
testString: 'assert(Math.round($("text").eq(2).attr("x")) == "350" && Math.round($("text").eq(2).attr("y")) == "329", "The third label should have an <code>x</code> value of approximately 350 and a <code>y</code> value of approximately 329 after applying the scales.");'
- text: 第四标签应该有一个<code>x</code>的大约141值和<code>y</code>施加鳞后的约60的值。
testString: 'assert(Math.round($("text").eq(3).attr("x")) == "141" && Math.round($("text").eq(3).attr("y")) == "60", "The fourth label should have an <code>x</code> value of approximately 141 and a <code>y</code> value of approximately 60 after applying the scales.");'
- text: 应用刻度后，第五个标签的<code>x</code>值约为449， <code>y</code>值约为237。
testString: 'assert(Math.round($("text").eq(4).attr("x")) == "449" && Math.round($("text").eq(4).attr("y")) == "237", "The fifth label should have an <code>x</code> value of approximately 449 and a <code>y</code> value of approximately 237 after applying the scales.");'
- text: 应用刻度后，第六个标签的<code>x</code>值约为280， <code>y</code>值约为306。
testString: 'assert(Math.round($("text").eq(5).attr("x")) == "280" && Math.round($("text").eq(5).attr("y")) == "306", "The sixth label should have an <code>x</code> value of approximately 280 and a <code>y</code> value of approximately 306 after applying the scales.");'
- text: 应用刻度后，第七个标签的<code>x</code>值约为370， <code>y</code>值约为351。
testString: 'assert(Math.round($("text").eq(6).attr("x")) == "370" && Math.round($("text").eq(6).attr("y")) == "351", "The seventh label should have an <code>x</code> value of approximately 370 and a <code>y</code> value of approximately 351 after applying the scales.");'
- text: 应用刻度后，第八个标签的<code>x</code>值约为270， <code>y</code>值约为132。
testString: 'assert(Math.round($("text").eq(7).attr("x")) == "270" && Math.round($("text").eq(7).attr("y")) == "132", "The eighth label should have an <code>x</code> value of approximately 270 and a <code>y</code> value of approximately 132 after applying the scales.");'
- text: 应用刻度后，第九个标签的<code>x</code>值约为140， <code>y</code>值约为144。
testString: 'assert(Math.round($("text").eq(8).attr("x")) == "140" && Math.round($("text").eq(8).attr("y")) == "144", "The ninth label should have an <code>x</code> value of approximately 140 and a <code>y</code> value of approximately 144 after applying the scales.");'
- text: 应用刻度后，第十个标签的<code>x</code>值约为88， <code>y</code>值约为326。
testString: 'assert(Math.round($("text").eq(9).attr("x")) == "88" && Math.round($("text").eq(9).attr("y")) == "326", "The tenth label should have an <code>x</code> value of approximately 88 and a <code>y</code> value of approximately 326 after applying the scales.");'
Challenge Seed
<body>
<script>
const dataset = [
[ 34, 78 ],
[ 109, 280 ],
[ 310, 120 ],
[ 79, 411 ],
[ 420, 220 ],
[ 233, 145 ],
[ 333, 96 ],
[ 222, 333 ],
[ 78, 320 ],
[ 21, 123 ]
];
const w = 500;
const h = 500;
const padding = 60;
const xScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[0])])
.range([padding, w - padding]);
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h - padding, padding]);
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
// Add your code below this line
// Add your code above this line
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text((d) => (d[0] + ", "
+ d[1]))
// Add your code below this line
// Add your code above this line
</script>
</body>
Solution
// solution required