115 lines
6.4 KiB
Markdown
115 lines
6.4 KiB
Markdown
---
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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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---
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## Description
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<section id='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 (<code>x</code>) and second (<code>y</code>) fields of each item in <code>dataset</code>.
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The <code>text</code> nodes need <code>x</code> and <code>y</code> attributes to position it on the SVG canvas. In this challenge, the <code>y</code> value (which determines height) can use the same value that the <code>circle</code> uses for its <code>cy</code> attribute. The <code>x</code> value can be slightly larger than the <code>cx</code> value of the <code>circle</code>, so the label is visible. This will push the label to the right of the plotted point.
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</section>
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## Instructions
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<section id='instructions'>
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Label each point on the scatter plot using the <code>text</code> 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 <code>x</code> attribute so it's 5 units more than the value you used for the <code>cx</code> attribute on the <code>circle</code>. Set the <code>y</code> attribute the same way that's used for the <code>cy</code> value on the <code>circle</code>.
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</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: Your code should have 10 <code>text</code> elements.
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testString: assert($('text').length == 10, 'Your code should have 10 <code>text</code> elements.');
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- text: The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.
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testString: assert($('text').eq(0).text() == '34, 78' && $('text').eq(0).attr('x') == '39' && $('text').eq(0).attr('y') == '422', 'The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.');
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- text: The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.
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testString: assert($('text').eq(1).text() == '109, 280' && $('text').eq(1).attr('x') == '114' && $('text').eq(1).attr('y') == '220', 'The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.');
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- text: The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.
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testString: assert($('text').eq(2).text() == '310, 120' && $('text').eq(2).attr('x') == '315' && $('text').eq(2).attr('y') == '380', 'The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.');
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- text: The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.
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testString: assert($('text').eq(3).text() == '79, 411' && $('text').eq(3).attr('x') == '84' && $('text').eq(3).attr('y') == '89', 'The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.');
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- text: The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.
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testString: assert($('text').eq(4).text() == '420, 220' && $('text').eq(4).attr('x') == '425' && $('text').eq(4).attr('y') == '280', 'The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.');
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- text: The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.
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testString: assert($('text').eq(5).text() == '233, 145' && $('text').eq(5).attr('x') == '238' && $('text').eq(5).attr('y') == '355', 'The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.');
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- text: The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.
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testString: assert($('text').eq(6).text() == '333, 96' && $('text').eq(6).attr('x') == '338' && $('text').eq(6).attr('y') == '404', 'The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.');
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- text: The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.
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testString: assert($('text').eq(7).text() == '222, 333' && $('text').eq(7).attr('x') == '227' && $('text').eq(7).attr('y') == '167', 'The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.');
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- text: The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.
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testString: assert($('text').eq(8).text() == '78, 320' && $('text').eq(8).attr('x') == '83' && $('text').eq(8).attr('y') == '180', 'The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.');
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- text: The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.
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testString: assert($('text').eq(9).text() == '21, 123' && $('text').eq(9).attr('x') == '26' && $('text').eq(9).attr('y') == '377', 'The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.');
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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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.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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</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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