2018-10-10 22:03:03 +00:00
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---
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id: 587d7fab367417b2b2512bd9
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2021-03-04 17:49:46 +00:00
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title: 向散点图的 Circles 添加标签
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2018-10-10 22:03:03 +00:00
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challengeType: 6
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2020-09-17 16:13:05 +00:00
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forumTopicId: 301477
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2021-01-13 02:31:00 +00:00
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dashedName: add-labels-to-scatter-plot-circles
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-03-04 17:49:46 +00:00
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你可以为散点图中的点添加文本来创建标签。
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2018-10-10 22:03:03 +00:00
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2021-03-04 17:49:46 +00:00
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目标是显示 `dataset` 中每个对象的第一个（`x`）和第二个（`y`）字段中通过逗号分隔的值。
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2020-12-16 07:37:30 +00:00
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2021-03-04 17:49:46 +00:00
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`text` 节点需要 `x` 和 `y` 属性来指定放置在 SVG 画布中的位置。 在这个挑战中，`y` 值（决定高度）可以用和 `circle` 的 `cy` 属性相同的值， `x` 值可以比 `circle` 的 `cx` 值稍微大一些，这样标签才可见， 并且被放置在散点的右边。
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2021-03-08 14:28:46 +00:00
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使用 `text` 元素标记散点图上的每个点。 标签的文本应该是用逗号和空格分隔的两个值。 例如，第一个点的标签是 `34, 78`。 设置 `x` 属性，使其比 `circle` 上的 `cx` 属性的值多 `5` 个单位。 设置 `y` 属性的方式与 `circle` 上的 `cy` 值相同。
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2020-12-16 07:37:30 +00:00
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# --hints--
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2021-03-08 14:28:46 +00:00
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应该有 10 个 `text` 元素。
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2020-12-16 07:37:30 +00:00
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```js
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assert($('text').length == 10);
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2018-10-10 22:03:03 +00:00
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```
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2021-03-08 14:28:46 +00:00
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第一个标签的文本应为 `34, 78`， `x` 值应为 `39`，`y` 应为 `422`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(0).text() == '34, 78' &&
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$('text').eq(0).attr('x') == '39' &&
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$('text').eq(0).attr('y') == '422'
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);
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2018-10-10 22:03:03 +00:00
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```
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2021-03-08 14:28:46 +00:00
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第二个标签的文本应为 `109, 280`，`x` 值应为`114`，`y` 值应为 `220`。
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2020-09-17 16:13:05 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(1).text() == '109, 280' &&
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$('text').eq(1).attr('x') == '114' &&
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$('text').eq(1).attr('y') == '220'
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2021-03-08 14:28:46 +00:00
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第三个标签的文本应为 `310, 120`，`x` 值应为 `315`，`y` 值应为 `380`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(2).text() == '310, 120' &&
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$('text').eq(2).attr('x') == '315' &&
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$('text').eq(2).attr('y') == '380'
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);
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```
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2021-03-08 14:28:46 +00:00
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第四个标签的文本应为 `79, 411`，`x` 值应为 `84`，`y` 值应为 `89`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(3).text() == '79, 411' &&
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$('text').eq(3).attr('x') == '84' &&
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$('text').eq(3).attr('y') == '89'
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);
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```
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2021-03-08 14:28:46 +00:00
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第五个标签的文本应为 `420, 220`，`x` 值应为 `425`，`y` 值应为 `280`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(4).text() == '420, 220' &&
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$('text').eq(4).attr('x') == '425' &&
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$('text').eq(4).attr('y') == '280'
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);
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```
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2021-03-08 14:28:46 +00:00
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第六个标签的文本应为 `233, 145`，`x` 值应为 `238`，`y` 值应为 `355`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(5).text() == '233, 145' &&
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$('text').eq(5).attr('x') == '238' &&
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$('text').eq(5).attr('y') == '355'
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);
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```
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2021-03-08 14:28:46 +00:00
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第七个标签的文本应为 `333, 96`，`x` 值应为 `338`，`y` 值应为 `404`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(6).text() == '333, 96' &&
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$('text').eq(6).attr('x') == '338' &&
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$('text').eq(6).attr('y') == '404'
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);
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```
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2021-03-08 14:28:46 +00:00
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第八个标签的文本应为 `222, 333`，`x` 值应为 `227`，`y` 值应为 `167`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(7).text() == '222, 333' &&
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$('text').eq(7).attr('x') == '227' &&
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$('text').eq(7).attr('y') == '167'
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);
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```
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2021-03-08 14:28:46 +00:00
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第九个标签的文本应为 `78, 320`，`x` 值应为 `83`，`y` 值应为 `180`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(8).text() == '78, 320' &&
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$('text').eq(8).attr('x') == '83' &&
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$('text').eq(8).attr('y') == '180'
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);
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```
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2021-03-08 14:28:46 +00:00
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第十个标签的文本应为 `21, 123`，`x` 值应为 `26`，`y` 值应为 `377`。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('text').eq(9).text() == '21, 123' &&
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$('text').eq(9).attr('x') == '26' &&
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$('text').eq(9).attr('y') == '377'
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);
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```
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2021-01-13 02:31:00 +00:00
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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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.data(dataset)
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.enter()
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.append("circle")
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.attr("cx", (d, i) => d[0])
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.attr("cy", (d, i) => h - d[1])
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.attr("r", 5);
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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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 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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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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.attr("cx", (d, i) => d[0])
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.attr("cy", (d, i) => h - d[1])
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.attr("r", 5);
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.attr("x", (d) => d[0] + 5)
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.attr("y", (d) => h - d[1])
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.text((d) => (d[0] + ", " + d[1]))
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2021-02-06 04:42:36 +00:00
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2021-01-13 02:31:00 +00:00
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</script>
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</body>
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```
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