2018-10-10 18:03:03 -04:00
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---
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id: 587d7fab367417b2b2512bd7
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challengeType: 6
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2020-09-18 00:13:05 +08:00
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forumTopicId: 301484
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2020-10-01 17:54:21 +02:00
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title: 使用 SVG Circles 创建散点图
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2018-10-10 18:03:03 -04:00
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---
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## Description
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2020-09-18 00:13:05 +08:00
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<section id='description'>
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散点图是另一种形式的可视化。它用圆圈来映射数据点，每个数据点有两个值，这两个值和 <code>x</code> 和 <code>y</code> 轴相关联，在可视化中用来给圆圈定位。
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SVG 用 <code>circle</code> 标签来创建圆形，它和之前用来构建条形图的 <code>rect</code> 非常相像。
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</section>
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2018-10-10 18:03:03 -04:00
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## Instructions
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2020-09-18 00:13:05 +08:00
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<section id='instructions'>
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使用 <code>data()</code>、<code>enter()</code>、<code>append()</code> 方法将 <code>dataset</code> 和新添加到 SVG 画布上的 <code>circle</code> 元素绑定起来。
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<strong>注意</strong><br>circles 并不可见，因为我们还没有设置它们的属性。我们会在下一个挑战来设置它。
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</section>
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2018-10-10 18:03:03 -04:00
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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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2020-09-18 00:13:05 +08:00
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- text: 你应该有 10 个 <code>circle</code> 元素。
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2020-02-18 01:40:55 +09:00
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testString: assert($('circle').length == 10);
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2018-10-10 18:03:03 -04:00
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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 = [
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[ 34, 78 ],
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[ 109, 280 ],
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[ 310, 120 ],
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[ 79, 411 ],
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[ 420, 220 ],
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[ 233, 145 ],
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[ 333, 96 ],
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[ 222, 333 ],
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[ 78, 320 ],
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[ 21, 123 ]
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];
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const w = 500;
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const h = 500;
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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("circle")
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2020-09-18 00:13:05 +08:00
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// 在下面添加你的代码
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2018-10-10 18:03:03 -04:00
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2020-09-18 00:13:05 +08:00
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// 在上面添加你的代码
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2018-10-10 18:03:03 -04:00
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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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2020-09-18 00:13:05 +08:00
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```html
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<body>
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<script>
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const dataset = [
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[ 34, 78 ],
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[ 109, 280 ],
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[ 310, 120 ],
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[ 79, 411 ],
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[ 420, 220 ],
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[ 233, 145 ],
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[ 333, 96 ],
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[ 222, 333 ],
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[ 78, 320 ],
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[ 21, 123 ]
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];
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const w = 500;
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const h = 500;
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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("circle")
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.data(dataset)
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.enter()
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.append("circle")
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</script>
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</body>
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2020-09-18 00:13:05 +08:00
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</section>
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