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@zhinan-oppo/canvas-player

v3.27.0

Published

Play image sequences with Canvas.

Downloads

63

Readme

scroll-handle

Install

使用 yarn 安装

yarn add @zhinan-oppo/canvas-player
import { CanvasPlayer } from '@zhinan-oppo/canvas-player';

Usage

CanvasPlayer

constructor(canvas, imageURLs, options?: CanvasPlayerOptions)

  • canvas: HTMLCanvasElement,用于绘制图片的 canvas
  • imageURLs: string[] 一组图片序列的 URL
  • options: 非必需
    • fitImageSize: boolean,默认true
      • 是否将 canvas 的widthheight设置成第一张加载完成的图片的widthheight
    • posterFrame: false|'first'|'last'|number,默认'first'
      • 'first'|'last': 默认显示第一张/最后一张图片
      • number: 默认显示imageURLs中对应的图片

load(): Promise<HTMLImageElement[]>

  • 加载所有图片

seek(i, options): Promise<void>

  • i: 0 <= i < imageURLs.length
  • options: 非必需
    • draw: 是否将当前指定的图片绘制到 canvas 中,默认true

seekPercent(p, options): Promise<void>

  • 相当于seek(Math.round(p * (imageURLs.length - 1)), options)

play(options): Promise<void>

  • 播放序列帧

  • options:

    • fps: number,每秒播放图片的张数,默认值 24
    • mode: enum PlayMode,默认值Normal
      • Normal: 顺序播放序列帧到结尾并停止
      • Reverse: 逆序播放序列帧到开头并停止
      • Loop: 顺序播放序列帧到结尾后从头开始
      • Alternate: 顺序播放序列帧到结尾后逆序播放,循环往复
    • waitingOnLoading: boolean,是否等待图片加载,默认true
      • true: 等待直到要绘制的图片加载完成
      • false: 不等待图片加载,下一帧图片可绘制时直接跳过正在加载的图片
    • onUpdated: (i: number) => void,图片绘制完成后的回调,参数i为所绘制的图片在imageURLs中的索引
    • onEnded: (i: number) => void,播放结束的回调
      • modePlayMode.Normal时,i === -1
      • modePlayMode.Reverse时,i === imageURLs.length
      • modePlayMode.LoopPlayMode.Alternate时,onEnded不会被触发

pause(): void

  • 暂停

playing: boolean

  • 是否在播放

Example

import { CanvasPlayer, PlayMode } from '@zhinan-oppo/canvas-player';

const canvas = document.getElementById('canvas');
const urls = ['https://example.com/0.png', 'https://example.com/1.png'];
const player = new CanvasPlayer(canvas, urls);
player.play({
  mode: PlayMode.Alternate,
  onUpdated: i => {
    console.log(i);
  },
});
<div>
  <canvas id="canvas" />
</div>