104 lines
2.3 KiB
Markdown
104 lines
2.3 KiB
Markdown
---
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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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dashedName: create-a-scatterplot-with-svg-circles
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---
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# --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 `x` and `y` axes, and are used to position the circle in the visualization.
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SVG has a `circle` tag to create the circle shape. It works a lot like the `rect` elements you used for the bar chart.
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# --instructions--
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Use the `data()`, `enter()`, and `append()` methods to bind `dataset` to new `circle` elements that are appended to the SVG canvas.
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**Note:** 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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# --hints--
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Your code should have 10 `circle` elements.
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```js
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assert($('circle').length == 10);
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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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// 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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</script>
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</body>
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```
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