144 lines
3.8 KiB
Vue
144 lines
3.8 KiB
Vue
<template>
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<div id="player" :class="{fullscreen: fullscreen}">
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<div>
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<label for="zoom">Zoom:</label>
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<input type="number" min="1" :max="50" value="1" class="slider" v-model.number="zoom" id="zoom">
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</div>
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<div id="player-canvas-container">
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<canvas ref="canvas" id="player-canvas"
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:height="canvas_height" :width="canvas_width">
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</canvas>
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</div>
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<div id="controls" class="{'fullscreen-controls': fullscreen}">
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<div>
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<input type="range" min="0" :max="frames - 1" value="0" class="slider" v-model.number="position">
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</div>
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<button @click="playPause">{{buttonLabel}}</button>
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</div>
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</div>
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</template>
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<script>
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export default {
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name: 'player',
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props: {
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width: String,
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height: String
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},
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data: function () {
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return {
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image: null,
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buttonLabel: 'PLAY',
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playing: false,
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zoom: 1,
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fullscreen: false,
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position: 0,
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tmp_ctx: null,
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animation_id: null
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}
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},
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computed: {
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frames: function () {
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if (this.image === null) return 0
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return Math.ceil(this.image.width / this.width) *
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Math.ceil(this.image.height / this.height)
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},
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canvas_height: function () {
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return this.height * this.zoom
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},
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canvas_width: function () {
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return this.width * this.zoom
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}
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},
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mounted: function () {
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this.$bus.$on('imageLoaded', (image) => {
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this.image = image
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})
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this.clear('red')
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},
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watch: {
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canvas_width: function () {
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setTimeout(() => {
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this.clear('red')
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}, 0)
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},
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canvas_height: function () {
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setTimeout(() => {
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this.clear('red')
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}, 0)
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},
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position: function () {
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if (this.playing || this.image === null) return
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this.tmp_ctx = this.$refs.canvas.getContext('2d')
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this.$render()
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}
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},
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methods: {
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playPause: function () {
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if (this.frames === 0) {
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return
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}
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this.playing = !this.playing
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if (this.playing) {
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this.tmp_ctx = this.$refs.canvas.getContext('2d')
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this.animation_id = requestAnimationFrame(this.$render_advance)
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this.buttonLabel = 'STOP'
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} else {
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cancelAnimationFrame(this.animation_id)
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this.buttonLabel = 'PLAY'
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}
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},
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clear: function (style) {
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let ctx = this.$refs.canvas.getContext('2d')
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ctx.fillStyle = style
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ctx.fillRect(0, 0, parseInt(this.canvas_width), parseInt(this.canvas_height))
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},
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$render: function () {
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let wb = Math.ceil(this.image.width / this.width)
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let x = (this.position % wb) * this.width
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let w = x + this.width < this.image.width ? this.width : this.image.width - x
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let y = Math.floor(this.position / wb) * this.height
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let h = y + this.height < this.image.height ? this.height : this.image.height - y
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if (w !== this.width || h !== this.height) this.clear('black')
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this.tmp_ctx.drawImage(this.image,
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x, y, w, h,
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0, 0, w * this.zoom, h * this.zoom)
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},
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$render_advance: function () {
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this.$render()
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if (this.position < this.frames) {
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this.position += 1
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this.animation_id = requestAnimationFrame(this.$render_advance)
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} else {
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this.playPause()
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this.position = 0
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}
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}
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}
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}
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</script>
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<style scoped>
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#player {
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text-align: center;
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}
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.fullscreen {
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position: absolute;
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top: 0;
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left: 0;
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background-color: rgba(1, 1, 1, .9);
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width: 100%;
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height: 100%;
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}
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.fullscreen-controls {
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position: absolute;
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bottom: 0;
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}
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#zoom {
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width: 3em;
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}
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</style>
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