95 lines
3.3 KiB
Markdown
95 lines
3.3 KiB
Markdown
---
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id: 587d7fa9367417b2b2512bd0
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title: Invert SVG Elements
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required:
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- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
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challengeType: 6
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videoUrl: ''
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localeTitle: 反转SVG元素
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---
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## Description
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undefined
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## Instructions
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<section id="instructions">更改<code>y</code>属性的回调函数以将栏设置为正面朝上。请记住，条形的<code>height</code>是数据值<code>d</code> 3倍。 <strong>注意</strong> <br>通常，关系是<code>y = h - m * d</code> ，其中<code>m</code>是缩放数据点的常数。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 第一个<code>rect</code>的<code>y</code>值应为64。
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testString: 'assert($("rect").eq(0).attr("y") == h - (dataset[0] * 3), "The first <code>rect</code> should have a <code>y</code> value of 64.");'
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- text: 第二个<code>rect</code>的<code>y</code>值应为7。
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testString: 'assert($("rect").eq(1).attr("y") == h - (dataset[1] * 3), "The second <code>rect</code> should have a <code>y</code> value of 7.");'
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- text: 第三个<code>rect</code>的<code>y</code>值应为34。
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testString: 'assert($("rect").eq(2).attr("y") == h - (dataset[2] * 3), "The third <code>rect</code> should have a <code>y</code> value of 34.");'
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- text: 第四个<code>rect</code>的<code>y</code>值应为49。
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testString: 'assert($("rect").eq(3).attr("y") == h - (dataset[3] * 3), "The fourth <code>rect</code> should have a <code>y</code> value of 49.");'
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- text: 第五个<code>rect</code>的<code>y</code>值应为25。
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testString: 'assert($("rect").eq(4).attr("y") == h - (dataset[4] * 3), "The fifth <code>rect</code> should have a <code>y</code> value of 25.");'
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- text: 第六个<code>rect</code>的<code>y</code>值应为46。
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testString: 'assert($("rect").eq(5).attr("y") == h - (dataset[5] * 3), "The sixth <code>rect</code> should have a <code>y</code> value of 46.");'
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- text: 第七个<code>rect</code>的<code>y</code>值应为13。
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testString: 'assert($("rect").eq(6).attr("y") == h - (dataset[6] * 3), "The seventh <code>rect</code> should have a <code>y</code> value of 13.");'
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- text: 第八个<code>rect</code>的<code>y</code>值应为58。
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testString: 'assert($("rect").eq(7).attr("y") == h - (dataset[7] * 3), "The eighth <code>rect</code> should have a <code>y</code> value of 58.");'
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- text: 第九个<code>rect</code>的<code>y</code>值应为73。
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testString: 'assert($("rect").eq(8).attr("y") == h - (dataset[8] * 3), "The ninth <code>rect</code> should have a <code>y</code> value of 73.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => {
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// Add your code below this line
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// Add your code above this line
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})
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.attr("width", 25)
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.attr("height", (d, i) => 3 * d);
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</script>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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