Note: This project is no longer actively maintained.
Unfortunately, none of this project's authors have the time/enthusiasm to maintain this project right now. We recommend forking this project, or reading its source to learn how it's built).
Graphing tools are often complex, abstract, and heavy. They require domain-specific knowledge, and a significant time investment.
While building rich data visualizations for an analytics app, this is a necessary cost. But what if you just need a spark line that shows a trend?
For example, here's how GitHub shows activity on a repo:
Here's how Twitter displays your recent analytics:
These are very simple and elegant visualizations, and they should not require a bloated graphing library to produce.
React Trend is a concrete component that does 1 thing, and does it well: generate these trending graphs.
Demo
Check out the React Trend playground.
Features
- Simple. Integrate in seconds.
- Scalable. Uses SVG for sharp, scalable graphs. Will fill the parent container, or you can provide a fixed size.
- Beautiful. Built-in gradient support, and customizable smoothing.
- Animatable. Support for on-mount animations where the trend graph draws from left to right.
- Tiny. Zero-dependency, gzips to <3kb.
Installation
$ yarn add react-trend # Alternatively: $ npm i -S react-trend
UMD builds are also available via CDN:
UMD build exposes the component as Trend
.
Quickstart
import Trend from 'react-trend'; const MyComponent = () => <Trend data={[0, 10, 5, 22, 3.6, 11]} />; // That's it! // You can, of course, customize it. Check out the API Reference below. // Be sure to check out `autoDraw`, `gradient`, and `smoothing`.
API Reference
SVG Props
By default, all properties not recognized by React Trend will be delegated to the SVG. The line inherits these properties if none of its own override them.
This means that, among other properties, you can use:
stroke
to set a solid colour,strokeWidth
to change the default line thickness,strokeOpacity
to create a transparent line,strokeLinecap
/strokeLinejoin
to control the edges of your line,strokeDasharray
to create a dashed line, andstrokeDashoffset
to control where the dashes start.
autoDraw
Type | Required | Default |
---|---|---|
Boolean | ✕ | false |
Allow the line to draw itself on mount. Set to true
to enable, and customize using autoDrawDuration
and autoDrawEasing
.
NOTE: This property uses strokeDasharray
and strokeDashoffset
under the hood to perform the animation. Because of this, any values you provide for those properties will be ignored.
Example
<Trend data={data} autoDraw autoDrawDuration={3000} autoDrawEasing="ease-in" />
autoDrawDuration
Type | Required | Default |
---|---|---|
Number | ✕ | 2000 |
The amount of time, in milliseconds, that the autoDraw animation should span.
This prop has no effect if autoDraw
isn't set to true
.
Example
<Trend data={data} autoDraw autoDrawDuration={3000} autoDrawEasing="ease-in" />
autoDrawEasing
Type | Required | Default |
---|---|---|
String | ✕ | ease |
The easing function to use for the autoDraw animation. Accepts any transition timing function within the CSS spec (eg. linear
, ease
, ease-in
, cubic-bezier
...).
This prop has no effect if autoDraw
isn't set to true
.
Example
<Trend data={data} autoDraw autoDrawDuration={3000} autoDrawEasing="ease-in" />
data
Type | Required | Default |
---|---|---|
[Number|Object] | ✓ | undefined |
The data accepted by React Trend is incredibly simple: An array of y-axis values to graph.
React Trend takes care of normalization, so don't worry about ensuring the data is in a specific range.
This does mean that all data points will be evenly-spaced. If you have irregularly-spaced data, it will not be properly represented.
As of v1.2.0, you may supply an array of data objects with a value
property.
Example
<Trend data={[120, 149, 193.4, 200, 92]} /> <Trend data={[{ value: 4 }, { value: 6 }, { value: 8 }]} />
gradient
Type | Required | Default |
---|---|---|
[String] | ✕ | undefined |
React Trend supports vertical gradients. It accepts an array of 2+ colour values, and will fade evenly between them from the bottom up.
Colour can be specified as any SVG-supported format (named, rgb, hex, etc).
Example
<Trend gradient={['#0FF', '#F0F', '#FF0']} />
height
Type | Required | Default |
---|---|---|
Number | ✕ | undefined |
Set an explicit height for your SVG. By default it ensures a 1:4 aspect ratio with the width, and the width expands to fill the container.
Note that in most cases it is sufficient to leave this blank, and just control the size of the parent container.
Example
<Trend width={200} height={200} />
padding
Type | Required | Default |
---|---|---|
Number | ✕ | 8 |
If you set a very large strokeWidth
on your line, you may notice that it gets "cropped" towards the edges. This is because SVGs don't support overflow.
By increasing this number, you expand the space around the line, so that very thick lines aren't cropped.
In most cases you don't need to touch this value.
Example
<Trend strokeWidth={20} padding={18} />
radius
Type | Required | Default |
---|---|---|
Number | ✕ | 10 |
When using smoothing, you may wish to control the amount of curve around each point. For example, a 0
radius is equivalent to not having any smoothing at all, where an impossibly-large number like 10000
will ensure that each peak is as curved as it can possibly be.
This prop has no effect if smooth
isn't set to true
.
Example
<Trend smooth radius={20} strokeWidth={4} />
smooth
Type | Required | Default |
---|---|---|
Boolean | ✕ | false |
Smooth allows the peaks to be 'rounded' out so that the line has no jagged edges.
By tweaking the radius prop, you can use this as a subtle prop to tone down the sharpness, or you can set a very high radius to create a snake-like line.
Example
<Trend smooth radius={20} strokeWidth={4} />
width
Type | Required | Default |
---|---|---|
Number | ✕ | undefined |
Set an explicit width for your SVG. By default it ensures a 1:4 aspect ratio with the height, expanding to fill the width of the container.
Note that in most cases it is sufficient to leave this blank, and just control the width of the parent container.
Example
<Trend width={200} height={200} />