# Counter
A React library for animating numeric transitions. Perfect for timers, counters, or progress displays.

* Animate numbers with increasing (start < end) or decreasing (start > end) values.
* Works with decimal numbers

![Animation](https://raw.githubusercontent.com/kolesnikanton/counter/master/static/animation.gif)

## Demo
See demo [HERE](https://antonkolesnik.com/counter)

## Props
| Name          | Type                           | Default Value | Description                                          |
|---------------|--------------------------------|---------------|------------------------------------------------------|
| duration      | number (required)              | -             | Duration of the animation in milliseconds.           |
| start         | string                         | `0`           | Initial number.                                      |
| end           | string                         | `0`           | Final number.                                        |
| fontSize      | number                         | 80            | Font size for of counter text (in pixels).           |
| decimals      | number                         | -             | Number of decimal places to display.                 |
| onUpdate      | (nextValue: string) => void    | -             | Callback function to get next counter value.         |
| isStart       | boolean                        | null          | To manually start the counter.                       |
| className     | string                         | -             | CSS class name for custom styling.                   |
| withAnimation | boolean                        | false         | Enables smooth transition animation for the counter. |

## Installation

#### Install with NPM
```bash
npm install @antonkolesnik/counter
```
#### Install with Yarn
```bash
yarn add @antonkolesnik/counter
```

## Stylesheets
```js
import '@antonkolesnik/counter/lib/styles.css';
```

## Usage
```js
import Counter from '@antonkolesnik/counter';
import '@antonkolesnik/counter/lib/styles.css';

const Demo = () => (
  <>
    <Counter start="100" duration={10000} fontSize={50} />
    <Counter end="500" duration={10000} />
    <Counter start="200" end="50" duration={10000} />
    <Counter start="100" end="200" duration={10000} />
    <Counter start="1.20" end="10.5" duration={10000} decimals={1} />
    <Counter start="200" end="100" duration={100000} withAnimation />
    <Counter end="100" duration={10000} isStart={isStartState} />
    <Counter end="100" duration={10000} onUpdate={(nextVal) => {console.log(nextVal)}} />
  </>
);
```