105 lines
2.3 KiB
Markdown
105 lines
2.3 KiB
Markdown
|
---
|
||
|
|
id: 587d7fab367417b2b2512bd7
|
||
|
|
title: Create a Scatterplot with SVG Circles
|
||
|
|
challengeType: 6
|
||
|
|
forumTopicId: 301484
|
||
|
|
dashedName: create-a-scatterplot-with-svg-circles
|
||
|
|
---
|
||
|
|
|
||
|
|
# --description--
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
SVG has a `circle` tag to create the circle shape. It works a lot like the `rect` elements you used for the bar chart.
|
||
|
|
|
||
|
|
# --instructions--
|
||
|
|
|
||
|
|
Use the `data()`, `enter()`, and `append()` methods to bind `dataset` to new `circle` elements that are appended to the SVG canvas.
|
||
|
|
|
||
|
|
**Note**
|
||
|
|
The circles won't be visible because we haven't set their attributes yet. We'll do that in the next challenge.
|
||
|
|
|
||
|
|
# --hints--
|
||
|
|
|
||
|
|
Your code should have 10 `circle` elements.
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert($('circle').length == 10);
|
||
|
|
```
|
||
|
|
|
||
|
|
# --seed--
|
||
|
|
|
||
|
|
## --seed-contents--
|
||
|
|
|
||
|
|
```html
|
||
|
|
<body>
|
||
|
|
<script>
|
||
|
|
const dataset = [
|
||
|
|
[ 34, 78 ],
|
||
|
|
[ 109, 280 ],
|
||
|
|
[ 310, 120 ],
|
||
|
|
[ 79, 411 ],
|
||
|
|
[ 420, 220 ],
|
||
|
|
[ 233, 145 ],
|
||
|
|
[ 333, 96 ],
|
||
|
|
[ 222, 333 ],
|
||
|
|
[ 78, 320 ],
|
||
|
|
[ 21, 123 ]
|
||
|
|
];
|
||
|
|
|
||
|
|
|
||
|
|
const w = 500;
|
||
|
|
const h = 500;
|
||
|
|
|
||
|
|
const svg = d3.select("body")
|
||
|
|
.append("svg")
|
||
|
|
.attr("width", w)
|
||
|
|
.attr("height", h);
|
||
|
|
|
||
|
|
svg.selectAll("circle")
|
||
|
|
// Add your code below this line
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
// Add your code above this line
|
||
|
|
|
||
|
|
</script>
|
||
|
|
</body>
|
||
|
|
```
|
||
|
|
|
||
|
|
# --solutions--
|
||
|
|
|
||
|
|
```html
|
||
|
|
<body>
|
||
|
|
<script>
|
||
|
|
const dataset = [
|
||
|
|
[ 34, 78 ],
|
||
|
|
[ 109, 280 ],
|
||
|
|
[ 310, 120 ],
|
||
|
|
[ 79, 411 ],
|
||
|
|
[ 420, 220 ],
|
||
|
|
[ 233, 145 ],
|
||
|
|
[ 333, 96 ],
|
||
|
|
[ 222, 333 ],
|
||
|
|
[ 78, 320 ],
|
||
|
|
[ 21, 123 ]
|
||
|
|
];
|
||
|
|
|
||
|
|
|
||
|
|
const w = 500;
|
||
|
|
const h = 500;
|
||
|
|
|
||
|
|
const svg = d3.select("body")
|
||
|
|
.append("svg")
|
||
|
|
.attr("width", w)
|
||
|
|
.attr("height", h);
|
||
|
|
|
||
|
|
svg.selectAll("circle")
|
||
|
|
.data(dataset)
|
||
|
|
.enter()
|
||
|
|
.append("circle")
|
||
|
|
|
||
|
|
</script>
|
||
|
|
</body>
|
||
|
|
```
|