2018-10-10 18:03:03 -04:00
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---
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id: 587d7fab367417b2b2512bd7
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2021-03-09 08:51:59 -07:00
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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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challengeType: 6
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2020-09-18 00:13:05 +08:00
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forumTopicId: 301484
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2021-01-13 03:31:00 +01:00
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dashedName: create-a-scatterplot-with-svg-circles
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2018-10-10 18:03:03 -04:00
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---
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2020-12-16 00:37:30 -07:00
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# --description--
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2018-10-10 18:03:03 -04:00
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2021-03-09 08:51:59 -07:00
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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 `x` 和 `y` 轴相关联，在可视化中用来给圆圈定位。
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2018-10-10 18:03:03 -04:00
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2021-03-09 08:51:59 -07:00
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SVG 用 `circle` 标签来创建圆形。 它和之前用来构建条形图的 `rect` 非常相像。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --instructions--
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2018-10-10 18:03:03 -04:00
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2021-03-09 08:51:59 -07:00
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使用 `data()`、`enter()`、`append()` 方法将 `dataset` 和新添加到 SVG 画布上的 `circle` 元素绑定起来。
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2018-10-10 18:03:03 -04:00
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2021-03-09 08:51:59 -07:00
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**注意：** 圆形并不可见，因为我们还没有设置它们的属性。 我们会在下一个挑战中设置属性。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --hints--
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2018-10-10 18:03:03 -04:00
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2021-03-09 08:51:59 -07:00
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应该有 10 个 `circle` 元素。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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assert($('circle').length == 10);
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2018-10-10 18:03:03 -04:00
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```
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2021-01-13 03:31:00 +01:00
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# --seed--
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## --seed-contents--
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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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// Add your code below this line
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// Add your code above this line
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</script>
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</body>
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```
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2020-12-16 00:37:30 -07:00
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# --solutions--
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2020-08-13 17:24:35 +02:00
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2021-01-13 03:31:00 +01:00
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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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```
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