gaspersic/freeCodeCamp
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Added solution to D3 use dynamic scales challenge (#34241)

Browse Source 
* Update index.md

* Update index.md

* Update spacing

* Update index.md
This commit is contained in:
The Coding Aviator
2019-05-16 21:34:08 +05:30
committed by Randell Dawson
parent c33260581b
commit e6fef5ff34
1 changed files with 64 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
guide/english/certifications/data-visualization/data-visualization-with-d3/use-dynamic-scales/index.md
View File

@ -3,8 +3,69 @@ title: Use Dynamic Scales
--- ---
## Use Dynamic Scales ## Use Dynamic Scales
This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/data-visualization/data-visualization-with-d3/use-dynamic-scales/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>. ### Hint 1
<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>. Use the `.domain()` and `.range()` functions.
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds --> ### Hint 2
Use a callback function on the `.domain()` function.
### Hint 3
Both the `.domain()` and `.range()` functions accept an array or two elements.
### Hint 4
Subtract padding from height to get SVG height including padding.
### Solution
To solve the solution by including all the hints, set the `yScale` variable to:
```js
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h - padding, padding]);
```
The full solution now looks like:
```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;
// Padding between the SVG canvas boundary and the plot
const padding = 30;
// Create an x and y scale
const xScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[0])])
.range([padding, w - padding]);
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h - padding, padding]);
const output = yScale(411);
d3.select("body")
.append("h2")
.text(output);
</script>
</body>
```