225 lines
5.5 KiB
Markdown
225 lines
5.5 KiB
Markdown
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---
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id: 587d7fab367417b2b2512bd9
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title: Add Labels to Scatter Plot Circles
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challengeType: 6
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forumTopicId: 301477
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dashedName: add-labels-to-scatter-plot-circles
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---
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# --description--
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You can add text to create labels for the points in a scatter plot.
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The goal is to display the comma-separated values for the first (`x`) and second (`y`) fields of each item in `dataset`.
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The `text` nodes need `x` and `y` attributes to position it on the SVG canvas. In this challenge, the `y` value (which determines height) can use the same value that the `circle` uses for its `cy` attribute. The `x` value can be slightly larger than the `cx` value of the `circle`, so the label is visible. This will push the label to the right of the plotted point.
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# --instructions--
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Label each point on the scatter plot using the `text` elements. The text of the label should be the two values separated by a comma and a space. For example, the label for the first point is "34, 78". Set the `x` attribute so it's 5 units more than the value you used for the `cx` attribute on the `circle`. Set the `y` attribute the same way that's used for the `cy` value on the `circle`.
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# --hints--
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Your code should have 10 `text` elements.
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```js
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assert($('text').length == 10);
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```
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The first label should have text of "34, 78", an `x` value of 39, and a `y` value of 422.
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```js
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assert(
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$('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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```
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The second label should have text of "109, 280", an `x` value of 114, and a `y` value of 220.
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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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$('text').eq(1).attr('y') == '220'
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);
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```
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The third label should have text of "310, 120", an `x` value of 315, and a `y` value of 380.
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```js
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assert(
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$('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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The fourth label should have text of "79, 411", an `x` value of 84, and a `y` value of 89.
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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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$('text').eq(3).attr('y') == '89'
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);
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```
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The fifth label should have text of "420, 220", an `x` value of 425, and a `y` value of 280.
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```js
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assert(
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$('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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The sixth label should have text of "233, 145", an `x` value of 238, and a `y` value of 355.
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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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$('text').eq(5).attr('y') == '355'
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);
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```
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The seventh label should have text of "333, 96", an `x` value of 338, and a `y` value of 404.
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```js
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assert(
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$('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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The eighth label should have text of "222, 333", an `x` value of 227, and a `y` value of 167.
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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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$('text').eq(7).attr('y') == '167'
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);
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```
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The ninth label should have text of "78, 320", an `x` value of 83, and a `y` value of 180.
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```js
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assert(
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$('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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The tenth label should have text of "21, 123", an `x` value of 26, and a `y` value of 377.
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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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# --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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# --solutions--
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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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</script>
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</body>
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```
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