118 lines
2.6 KiB
Markdown
118 lines
2.6 KiB
Markdown
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---
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id: 587d7fab367417b2b2512bd7
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title: Create a Scatterplot with SVG Circles
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challengeType: 6
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forumTopicId: 301484
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---
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## Description
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<section id='description'>
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A scatter plot is another type of visualization. It usually uses circles to map data points, which have two values each. These values tie to the <code>x</code> and <code>y</code> axes, and are used to position the circle in the visualization.
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SVG has a <code>circle</code> tag to create the circle shape. It works a lot like the <code>rect</code> elements you used for the bar chart.
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</section>
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## Instructions
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<section id='instructions'>
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Use the <code>data()</code>, <code>enter()</code>, and <code>append()</code> methods to bind <code>dataset</code> to new <code>circle</code> elements that are appended to the SVG canvas.
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<strong>Note</strong><br>The circles won't be visible because we haven't set their attributes yet. We'll do that in the next challenge.
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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>circle</code> elements.
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testString: assert($('circle').length == 10);
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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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// 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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```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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</section>
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