apng-canvas-typescript

This Library is based on

``json
"name": "apng-canvas",
"version": "2.1.3",
"author": "David Mzareulyan",
"description": "Library for displaing animated PNG files in browsers with canvas support",
"keywords": [
"apng",
"animation",
"animated png",
"canvas"
],
"homepage": "https://github.com/davidmz/apng-canvas"
`

Thanks for his work!

Introduction

Library to display Animated PNG (Wikipedia, specification) in a browser using canvas

You can totally control it.

[]()

The library requires support from the following technologies in order to run:

- Canvas
- Typed Arrays
- Blob URLs
- requestAnimationFrame

How To Use

`html

`
style='opacity:0' this is important

`javascript
import APNG from "apng-canvas-typescript";
let apng = new APNG();
`

api

$3

is support apng


`javascript
apng
.isSupport()
.then(() => {
console.log("not support");
})
.catch(() => {
console.log("support");
});
`

$3

covert apng to canvas data

| param | type | about |
| -------- | -------------- | ----------- |
| img | HTMLImgElement | img dom |
| autoplay | boolean | auto or not |

@return Promise

`javascript
var image1 = document.querySelector(".apng-image1");
apng.animateImage(image1, false).then((anim) => {
anim.play([50, 70]);
anim.before((ctx, f) => {
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 100 + f 3, 100 + f 3);
});
anim.after((ctx, f) => {
ctx.fillStyle = "blue";
ctx.fillRect(200, 200, 100 + f 3, 100 + f 3);
});
});
`

$3

#### anim.play(frameArray)

| param | type | about |
| ---------- | ----- | ---------------------------------------------------------------------------- |
| frameArray | array | [start,end] the frames range you want to play ,[start] means play to the end |

#### anim.stop()

#### anim.pause(frame)

| param | type | about |
| ----- | ------ | ------------------------ |
| frame | number | stop at the frame number |

#### anim.start()

restart (use with pause)

`javascript
anim.pause(5);
anim.start();
`

#### anim.setOptions({playNum,rate})

| param | type | about | default |
| ------- | ------ | ----------- | -------------------------- |
| playNum | number | play number | 0: play again and again :) |
| rate | number | play rate | 1 |

#### anim.before(func) & anim.after(func)

ctx:RenderingContext
f: frame number

`javascript
anim.before((ctx, f) => {
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 100 + f 3, 100 + f 3);
});
anim.after((ctx, f) => {
ctx.fillStyle = "blue";
ctx.fillRect(200, 200, 100 + f 3, 100 + f 3);
});
``