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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| export class Danmaku { | ||
| constructor(canvas, video, data) { | ||
| this.canvas = canvas | ||
| this.video = video | ||
| this.context = canvas.getContext('2d') | ||
| this.canvas.width = video.clientWidth | ||
| this.canvas.height = video.clientHeight | ||
| let defaultOpts = { | ||
| color: '#fff', | ||
| fontSize: 20, | ||
| speed: 2, | ||
| data: [] | ||
| } | ||
| Object.assign(this, defaultOpts, { data }) | ||
|
|
||
| this.paused = true | ||
| this.danmaku = this.data.map(danmu => new Danmu(danmu, this)) | ||
|
|
||
| this.render() | ||
| } | ||
|
|
||
| render() { | ||
| this.context.clearRect(0, 0, this.canvas.width, this.canvas.height) | ||
| this.draw() | ||
| if (!this.paused) { | ||
| requestAnimationFrame(this.render.bind(this)) | ||
| } | ||
| } | ||
|
|
||
| draw() { | ||
| let cTime = this.video.currentTime | ||
| this.danmaku.forEach(danmu => { | ||
| if (!danmu.flag && danmu.pos <= cTime) { | ||
| if (!danmu.once) { | ||
| danmu.init() | ||
| danmu.once = true | ||
| } | ||
| danmu.x -= danmu.speed | ||
| danmu.render() | ||
| if (danmu.x <= danmu.width * -1) { | ||
| danmu.flag = true | ||
| } | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| add(danmu) { | ||
| this.danmaku.push(new Danmu(danmu, this)) | ||
| } | ||
|
|
||
| play() { | ||
| this.paused = false | ||
| this.render() | ||
| } | ||
|
|
||
| pause() { | ||
| this.paused = true | ||
| } | ||
|
|
||
| reset() { | ||
| this.context.clearRect(0, 0, this.canvas.width, this.canvas.height) | ||
| let cTime = this.video.currentTime | ||
| this.danmaku.forEach(danmu => { | ||
| danmu.flag = false | ||
| if (cTime < danmu.pos) { | ||
| danmu.paused = false | ||
| } else { | ||
| danmu.flag = true | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| class Danmu { | ||
| constructor(danmu, vm) { | ||
| this.danmu = danmu | ||
| this.content = danmu.content | ||
| this.pos = danmu.pos | ||
| this.vm = vm | ||
| } | ||
|
|
||
| init() { | ||
| this.color = this.danmu.color || this.vm.color | ||
| this.fontSize = this.danmu.fontSize || this.vm.fontSize | ||
| this.speed = this.danmu.speed || this.vm.speed | ||
|
|
||
| let span = document.createElement('span') | ||
| span.innerText = this.content | ||
| span.style.font = this.fontSize + 'px "微软雅黑"' | ||
| span.style.position = 'absolute' | ||
| document.body.appendChild(span) | ||
| this.width = span.clientWidth | ||
| document.body.removeChild(span) | ||
|
|
||
| this.x = this.vm.canvas.width | ||
| let r = this.vm.canvas.height * Math.random() | ||
| this.y = r - (r % this.fontSize) | ||
|
|
||
| if (this.y < this.fontSize) this.y = this.fontSize | ||
| if (this.y > this.vm.canvas.height - this.fontSize) | ||
| this.y = this.vm.canvas.height - this.fontSize | ||
| } | ||
|
|
||
| render() { | ||
| this.vm.context.font = this.fontSize + 'px "微软雅黑"' | ||
| this.vm.context.fillStyle = this.color | ||
| this.vm.context.fillText(this.content, this.x, this.y) | ||
| } | ||
| } | ||
|
|
||
| export default Danmaku |
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