vue实现画笔回放canvas转视频播放功能
作者：禾小毅
这篇文章主要介绍了vue实现画笔回放，canvas转视频播放功能,本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
示例图：
一、vue2版本
<template>
<div class="canvas-video">
<canvas
ref="myCanvasByVideo"
class="myCanvas"
id="myCanvasByVideo"
:width="width"
:height="height"
></canvas>
<div class="btnDiv">
<div
v-if="!isPlayVideo && !isStartVideo"
class="playback"
@click.stop="playVideo"
>
<div>回放</div>
<img src="@/assets/image/play.png" alt="" />
</div>
<div
v-if="isPlayVideo && isStartVideo"
class="playback"
@click.stop="pauseVideo"
>
<div>暂停</div>
<img src="@/assets/image/pause.png" alt="" />
</div>
<div
v-if="!isPlayVideo && isStartVideo"
class="playback"
@click.stop="continueVideo"
>
<div>继续</div>
<img src="@/assets/image/play.png" alt="" />
</div>
<div class="rocket">
<img
v-show="isRocket"
src="@/assets/image/rocket.png"
alt=""
@click="playRocket"
/>
<img
v-show="!isRocket"
src="@/assets/image/rocket_noChoose.png"
alt=""
@click="playRocket"
/>
</div>
<div class="mySlider">
<el-slider
v-model="nowTime"
:max="allTime"
@change="changeVideoSilder"
></el-slider>
</div>
<div class="myTime">
{{ getFormatTime(nowTime) }} / {{ getFormatTime(allTime) }}
</div>
<div class="mySpeed">
<div @click.stop="isShowSpeedBox = !isShowSpeedBox">
{{ speedList.filter((item) => item.value === nowSpeed)[0].name }}
</div>
<div class="speedList" v-show="isShowSpeedBox">
<div
class="speedItem"
:class="item.value === nowSpeed ? 'active' : ''"
v-for="(item, index) in speedList"
:key="index"
@click.stop="changeSpeed(item.value)"
>
{{ item.name }}
</div>
</div>
</div>
</div>
</div>
</template>
<script>
export default {
name: "canvasVideo",
components: {},
props: {
width: {
type: Number,
default: 500,
},
height: {
type: Number,
default: 500,
},
lineWidth: {
type: Number,
default: 1,
},
backgroundColor: {
type: String,
default: "black",
},
color: {
type: String,
default: "red",
},
pointData: {
type: Array,
default: [
[
{
x: 144.42779541015625,
y: 112.7576904296875,
time: 1702536449825,
},
],
],
},
},
data() {
return {
canvasHistory: null,
myCanvasByVideo: null, // 视频播放画布
ctxByVideo: null, // 视频播放画布
drawLineTimer: null,
drawStepTimer: null,
isPlayVideo: false, // 是否正在播放
isStartVideo: false, // 是否开始播放
nowTime: 0, // 当前播放时间
allTime: 0, // 回放总时间
nowPoints: [], // 当前学生视频的所有绘制点坐标
indexStep: 0, // 当前播放绘制线条的下标
indexPoint: 0, // 当前播放绘制点的下标
nowTimer: null, // 计算当前播放时间的定时器
isShowSpeedBox: false, // 是否展示速度调整列表
nowSpeed: 1, // 当前速度
speedList: [
{
name: "3X",
value: 3,
},
{
name: "2X",
value: "2",
},
{
name: "1.5X",
value: 1.5,
},
{
name: "1X",
value: 1,
},
{
name: "0.5X",
value: 0.5,
},
],
isRocket: false, // 是否快速播放
gdbl: 2.4583, // 两种纸的坐标对应比例 小纸 2.4583 = 4720/1920 大纸 2.9167 = 5600/1920
};
},
mounted() {
this.nowPoints = this.pointData
this.initCanvasByVideo();
this.allTime = Math.ceil(
(this.nowPoints[this.nowPoints.length - 1][
this.nowPoints[this.nowPoints.length - 1].length - 1
].time -
this.nowPoints[0][0].time) /
1000
); // 最后一个坐标的时间 - 第一个坐标的时间
},
methods: {
// 快速播放
async playRocket() {
// 把所有状态清零
this.isPlayVideo = false;
this.isStartVideo = false;
this.indexStep = 0;
this.indexPoint = 0;
if (this.nowTimer) {
clearInterval(this.nowTimer);
}
if (this.drawStepTimer) {
clearTimeout(this.drawStepTimer);
}
if (this.drawLineTimer) {
clearTimeout(this.drawLineTimer);
}
this.nowTime = 0;
if (this.isRocket) {
this.isRocket = false;
return;
}
this.isPlayVideo = false;
this.isRocket = true;
this.ctxByVideo.strokeStyle = this.color;
this.ctxByVideo.translate(0.5, 0.5); // 抗锯齿（好像没得卵用）
this.ctxByVideo.antialias = "smooth"; // 抗锯齿（好像没得卵用）
this.ctxByVideo.imageSmoothingEnabled = true; // 抗锯齿（好像没得卵用）
this.ctxByVideo.lineJoin = "round"; // 设置圆角
this.ctxByVideo.lineWidth = this.lineWidth; // 设置粗细
this.ctxByVideo.shadowBlur = 1;
this.ctxByVideo.shadowColor = this.color;
this.ctxByVideo.clearRect(
0,
0,
this.myCanvasByVideo.width,
this.myCanvasByVideo.height
); // 清空
if (this.drawStepTimer) {
clearTimeout(this.drawStepTimer);
}
if (this.drawLineTimer) {
clearTimeout(this.drawLineTimer);
}
for (let j = 0; j < this.nowPoints.length; j++) {
this.indexStep = j;
this.ctxByVideo.beginPath();
let timeout = 0;
if (j !== 0) {
if (this.nowPoints[j].length && this.nowPoints[j - 1].length) {
timeout =
this.nowPoints[j][0].time -
this.nowPoints[j - 1][this.nowPoints[j - 1].length - 1].time;
}
}
await this.drawStepByRocket(this.nowPoints[j], 50);
}
this.isRocket = false;
},
//答题笔迹
async playVideo() {
if (this.isRocket) {
this.isPlayVideo = false;
clearInterval(this.nowTimer);
clearTimeout(this.drawLineTimer);
clearTimeout(this.drawStepTimer);
this.myCanvasByVideo.width = this.myCanvasByVideo.width; // 清空
this.canvasHistory = null;
// 清空操作
this.nowTime = 0;
this.isPlayVideo = false;
this.isStartVideo = false;
this.indexStep = 0;
this.indexPoint = 0;
clearInterval(this.nowTimer);
this.canvasHistory = null;
if (this.nowTimer) {
clearInterval(this.nowTimer);
}
if (this.drawStepTimer) {
clearTimeout(this.drawStepTimer);
}
if (this.drawLineTimer) {
clearTimeout(this.drawLineTimer);
}
}
this.isRocket = false;
this.isPlayVideo = true;
this.isStartVideo = true;
this.ctxByVideo.strokeStyle = this.color;
this.ctxByVideo.translate(0.5, 0.5); // 抗锯齿（好像没得卵用）
this.ctxByVideo.antialias = "smooth"; // 抗锯齿（好像没得卵用）
this.ctxByVideo.imageSmoothingEnabled = true; // 抗锯齿（好像没得卵用）
this.ctxByVideo.lineJoin = "round"; // 设置圆角
this.ctxByVideo.lineWidth = this.lineWidth; // 设置粗细
this.ctxByVideo.shadowBlur = 1;
this.ctxByVideo.shadowColor = this.color;
this.ctxByVideo.clearRect(
0,
0,
this.myCanvasByVideo.width,
this.myCanvasByVideo.height
); // 清空
this.nowTimer = setInterval(() => {
if (this.nowTime < this.allTime) {
this.nowTime++;
}
}, 1000 / this.nowSpeed);
for (let j = 0; j < this.nowPoints.length; j++) {
this.indexStep = j;
this.ctxByVideo.beginPath();
let timeout = 0;
if (j !== 0) {
if (this.nowPoints[j].length && this.nowPoints[j - 1].length) {
timeout =
this.nowPoints[j][0].time -
this.nowPoints[j - 1][this.nowPoints[j - 1].length - 1].time;
}
}
await this.drawStep(this.nowPoints[j], timeout / this.nowSpeed);
}
this.nowTime = this.allTime;
this.isPlayVideo = false;
clearInterval(this.nowTimer);
},
// 暂停播放
pauseVideo() {
this.isPlayVideo = false;
clearInterval(this.nowTimer);
clearTimeout(this.drawLineTimer);
clearTimeout(this.drawStepTimer);
this.ctxByVideo.stroke();
},
// 继续播放
async continueVideo() {
if (this.nowTime === this.allTime) {
// 播放完了重新播放
this.nowTime = 0;
this.playVideo();
return;
}
this.isPlayVideo = true;
let startIndex = JSON.parse(JSON.stringify(this.indexStep));
this.nowTimer = setInterval(() => {
if (this.nowTime < this.allTime) {
this.nowTime++;
}
}, 1000 / this.nowSpeed);
console.log("从这开始", this.indexStep, this.nowPoints);
// this.ctx.moveTo(0, 0)
// this.ctx.lineTo(500, 500)
// this.ctx.stroke();
// this.ctx.closePath();
for (let j = startIndex; j < this.nowPoints.length; j++) {
this.indexStep = j;
let timeout = 0;
if (j !== 0) {
if (this.nowPoints[j].length && this.nowPoints[j - 1].length) {
timeout =
this.nowPoints[j][0].time -
this.nowPoints[j - 1][this.nowPoints[j - 1].length - 1].time;
}
}
await this.drawStep(this.nowPoints[j], timeout / this.nowSpeed);
}
this.nowTime = this.allTime;
clearInterval(this.nowTimer);
this.isPlayVideo = false;
},
// 改变进度条(根据当前时间获取)
async changeVideoSilder() {
console.log("改变了");
clearInterval(this.nowTimer);
clearTimeout(this.drawLineTimer);
clearTimeout(this.drawStepTimer);
this.ctxByVideo.clearRect(
0,
0,
this.myCanvasByVideo.width,
this.myCanvasByVideo.height
); // 清空
this.ctxByVideo.strokeStyle = this.color;
this.ctxByVideo.translate(0.5, 0.5); // 抗锯齿（好像没得卵用）
this.ctxByVideo.antialias = "smooth"; // 抗锯齿（好像没得卵用）
this.ctxByVideo.imageSmoothingEnabled = true; // 抗锯齿（好像没得卵用）
this.ctxByVideo.lineJoin = "round"; // 设置圆角
this.ctxByVideo.lineWidth = this.lineWidth; // 设置粗细
this.ctxByVideo.shadowBlur = 1;
this.ctxByVideo.shadowColor = this.color;
let allTime = 0;
// 直接把进度条当前定位之前的画出来不加任何延时
here: for (let i = 0; i < this.nowPoints.length; i++) {
this.ctxByVideo.beginPath();
if (i) {
allTime +=
this.nowPoints[i][0].time -
this.nowPoints[i - 1][this.nowPoints[i - 1].length - 1].time;
console.log("1级时间", allTime, i);
}
for (let j = 0; j < this.nowPoints[i].length; j++) {
if (j) {
allTime +=
this.nowPoints[i][j].time - this.nowPoints[i][j - 1].time;
console.log("2级时间", allTime, i, j);
}
if (j !== this.nowPoints[i].length - 1) {
this.ctxByVideo.moveTo(
this.nowPoints[i][j].x / this.gdbl,
this.nowPoints[i][j].y / this.gdbl
);
this.ctxByVideo.lineTo(
this.nowPoints[i][j + 1].x / this.gdbl,
this.nowPoints[i][j + 1].y / this.gdbl
);
this.ctxByVideo.stroke();
this.ctxByVideo.closePath();
}
if (allTime >= this.nowTime * 1000) {
this.indexStep = i;
this.indexPoint = j;
break here;
}
}
}
if (this.isPlayVideo) {
// 如果是播放状态 则继续播放
this.continueVideo();
}
},
drawStep(data, time) {
return new Promise((resolve) => {
this.drawStepTimer = setTimeout(async () => {
let startIndex = JSON.parse(JSON.stringify(this.indexPoint));
for (let i = startIndex; i < data.length - 1; i++) {
this.indexPoint = i;
let timeLine = data[i + 1].time - data[i].time;
if (timeLine) {
// 点阵笔有很多点位不同但时间相同的点 不做异步处理
await this.drawLine(
data[i].x / this.gdbl,
data[i].y / this.gdbl,
data[i + 1].x / this.gdbl,
data[i + 1].y / this.gdbl,
(data[i].x + data[i + 1].x) / 2 / this.gdbl,
(data[i].y + data[i + 1].y) / 2 / this.gdbl,
timeLine / this.nowSpeed
);
} else {
this.ctxByVideo.moveTo(
data[i].x / this.gdbl,
data[i].y / this.gdbl
);
this.ctxByVideo.lineTo(
data[i + 1].x / this.gdbl,
data[i + 1].y / this.gdbl
);
this.ctxByVideo.stroke();
this.ctxByVideo.closePath();
}
}
this.indexPoint = 0;
this.ctxByVideo.stroke();
resolve();
}, time);
});
},
// 相同速度播放
drawStepByRocket(data, time) {
return new Promise((resolve) => {
this.drawStepTimer = setTimeout(async () => {
let startIndex = JSON.parse(JSON.stringify(this.indexPoint));
for (let i = startIndex; i < data.length - 1; i++) {
this.indexPoint = i;
let timeLine = data[i + 1].time - data[i].time;
if (timeLine) {
// 点阵笔有很多点位不同但时间相同的点 不做异步处理
await this.drawLine(
data[i].x / this.gdbl,
data[i].y / this.gdbl,
data[i + 1].x / this.gdbl,
data[i + 1].y / this.gdbl,
(data[i].x + data[i + 1].x) / 2 / this.gdbl,
(data[i].y + data[i + 1].y) / 2 / this.gdbl,
5
);
} else {
this.ctxByVideo.moveTo(
data[i].x / this.gdbl,
data[i].y / this.gdbl
);
this.ctxByVideo.lineTo(
data[i + 1].x / this.gdbl,
data[i + 1].y / this.gdbl
);
this.ctxByVideo.stroke();
this.ctxByVideo.closePath();
}
}
this.indexPoint = 0;
this.ctxByVideo.stroke();
resolve();
}, time);
});
},
drawLine(x1, y1, x2, y2, controlX, controlY, time) {
return new Promise((resolve) => {
this.drawLineTimer = setTimeout(() => {
this.ctxByVideo.moveTo(x1, y1);
this.ctxByVideo.lineTo(x2, y2);
// this.ctx.quadraticCurveTo(controlX, controlY, x2, y2)
this.ctxByVideo.stroke();
this.ctxByVideo.closePath();
resolve();
}, time);
});
},
// 改变播放速度
changeSpeed(speed) {
this.nowSpeed = speed;
this.isShowSpeedBox = false;
if (this.nowTimer) {
clearInterval(this.nowTimer);
if (this.isPlayVideo) {
this.nowTimer = setInterval(() => {
if (this.nowTime < this.allTime) {
this.nowTime++;
}
}, 1000 / this.nowSpeed);
}
}
},
getFormatTime(second) {
this.formatSecond(second);
},
initCanvasByVideo() {
this.myCanvasByVideo = document.getElementById("myCanvasByVideo");
this.ctxByVideo = this.myCanvasByVideo.getContext("2d");
},
formatSecond(allSecond) {
let minute = 0;
let second = 0;
second = allSecond % 60;
if (second < 10) {
second = "0" + second;
}
minute = Math.trunc(allSecond / 60);
if (minute < 10) {
minute = "0" + minute;
}
return minute + ":" + second;
},
},
};
</script>
<style lang="scss" scoped>
.canvas-video {
width: 100%;
height: 100%;
.myCanvas {
background: black;
}
.btnDiv {
display: flex;
justify-content: center;
margin-top: 5px;
.playback {
display: flex;
justify-content: space-between;
color: #ffffff;
text-align: center;
padding: 0 15px;
border-radius: 4px;
background: #00b386;
height: 28px;
line-height: 28px;
cursor: pointer;
img {
width: 10px;
height: 14px;
margin-top: 7px;
margin-left: 12px;
}
}
.rocket {
margin-top: 3px;
margin-left: 10px;
cursor: pointer;
}
.mySlider {
width: 500px;
margin-left: 20px;
::v-deep .el-slider__bar {
border-radius: 17px;
background: #00b386;
}
::v-deep .el-slider__button {
border: 1px solid #00b386;
}
::v-deep .el-slider__runway {
border-radius: 17px;
background: #444;
}
}
.myTime {
margin-left: 14px;
color: #a9a9a9;
line-height: 35px;
}
.mySpeed {
cursor: pointer;
position: relative;
border-radius: 2px;
background: #ef8714;
width: 60px;
height: 20px;
line-height: 20px;
text-align: center;
color: #ffffff;
margin-left: 20px;
margin-top: 5px;
.speedList {
position: absolute;
bottom: 20px;
border-radius: 2px;
background: #232322;
padding: 10px 0;
width: 60px;
.speedItem {
width: 100%;
text-align: center;
margin-bottom: 10px;
color: #ffffff;
}
.speedItem.active {
color: #ef8714;
font-size: 14px;
}
.speedItem:last-child {
margin-bottom: 0px;
}
z-index: 2000;
}
}
.slider-warpper {
width: 320px;
height: 16px;
position: absolute;
left: 280px;
// background: #ef9e00 !important;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
.slider-content {
width: 304px;
height: 16px;
background: #2d2d2d;
border: 1px solid rgba(255, 186, 33, 0.16);
border-radius: 22px;
position: relative;
.slider {
border-radius: 22px;
position: absolute;
left: 0;
top: 0;
width: 30px;
height: 16px;
background: #ffba21;
}
}
.persent {
margin-left: 10px;
color: #ffba21;
font-size: 18px;
font-weight: 600;
letter-spacing: 1.26px;
}
}
}
}
</style>二、vue3版本
<template>
<div class="canvas-video" :style="{width:props.width+'px',height:props.height+'px'}">
<img :src="props.backgroundColor" alt="">
<canvas ref="myCanvasByVideo" class="myCanvas" id="myCanvasByVideo" :width="props.width"></canvas>
</div>
<div class="btnDiv">
<div v-if="!state.isPlayVideo && !state.isStartVideo" class="playback" @click.stop="playVideo">
<div>回放</div>
</div>
<div v-if="state.isPlayVideo && state.isStartVideo" class="playback" @click.stop="pauseVideo">
<div>暂停</div>
</div>
<div v-if="!state.isPlayVideo && state.isStartVideo" class="playback" @click.stop="continueVideo">
<div>继续</div>
</div>
<div class="mySlider">
<el-slider v-model="state.nowTime" :max="state.allTime" @change="changeVideoSilder"></el-slider>
</div>
<div class="myTime">{{getFormatTime(state.nowTime)}} / {{getFormatTime(state.allTime)}}</div>
<!-- <div class="rocket playback">
<div v-show="!state.isRocket" @click="playRocket">快速回播</div>
<div v-show="state.isRocket" @click="playRocket">暂停播放</div>
</div> -->
<!-- <div class="mySpeed">
<div @click.stop="state.isShowSpeedBox = !state.isShowSpeedBox">{{state.speedList.filter((item:any) => item.value === state.nowSpeed)[0].name}}</div>
<div class="speedList" v-show="state.isShowSpeedBox">
<div class="speedItem" :class="item.value === state.nowSpeed ? 'active' : ''" v-for="(item, index) in state.speedList" :key="index" @click.stop="changeSpeed(item.value)">
{{item.name}}
</div>
</div>
</div> -->
</div>
</template>
<script setup lang="ts">
import { onMounted, reactive } from 'vue'
type TProps = {
width: number
height: number,
lineWidth: number,
backgroundColor: string,
color: string,
pointData: any
}
const props = withDefaults(defineProps<TProps>(), {})
const state = reactive<any>({
timeout:0,
minute:0,
second:0,
canvasHistory: null,
myCanvasByVideo: null, // 视频播放画布
ctxByVideo: null, // 视频播放画布
drawLineTimer: null,
drawStepTimer: null,
isPlayVideo: false, // 是否正在播放
isStartVideo: false, // 是否开始播放
nowTime: 0, // 当前播放时间
allTime: 0, // 回放总时间
nowPoints: [], // 当前学生视频的所有绘制点坐标
indexStep: 0, // 当前播放绘制线条的下标
indexPoint: 0, // 当前播放绘制点的下标
nowTimer: null, // 计算当前播放时间的定时器
isShowSpeedBox: false, // 是否展示速度调整列表
nowSpeed: 1, // 当前速度
speedList: [{
name: '3X',
value: 3
}, {
name: '2X',
value: '2'
}, {
name: '1.5X',
value: 1.5
}, {
name: '1X',
value: 1
}, {
name: '0.5X',
value: 0.5
}],
isRocket: false, // 是否快速播放
gdbl: 2.4583 // 两种纸的坐标对应比例 小纸 2.4583 = 4720/1920 大纸 2.9167 = 5600/1920
})
onMounted(()=> {
state.nowPoints = props.pointData
initCanvasByVideo()
state.allTime = Math.ceil((state.nowPoints[state.nowPoints.length - 1][state.nowPoints[state.nowPoints.length - 1].length - 1].time - state.nowPoints[0][0].time) / 1000) // 最后一个坐标的时间 - 第一个坐标的时间
})
// 快速播放
const playRocket = async () => {
// 把所有状态清零
state.isPlayVideo = false
state.isStartVideo = false
state.indexStep = 0
state.indexPoint = 0
if (state.nowTimer) {
clearInterval(state.nowTimer)
}
if (state.drawStepTimer) {
clearTimeout(state.drawStepTimer)
}
if (state.drawLineTimer) {
clearTimeout(state.drawLineTimer)
}
state.nowTime = 0
if (state.isRocket) {
state.isRocket = false
return
}
state.isPlayVideo = false
state.isRocket = true
state.ctxByVideo.strokeStyle = props.color
state.ctxByVideo.translate(0.5, 0.5) // 抗锯齿（好像没得卵用）
state.ctxByVideo.antialias = 'smooth' // 抗锯齿（好像没得卵用）
state.ctxByVideo.imageSmoothingEnabled = true // 抗锯齿（好像没得卵用）
state.ctxByVideo.lineJoin = 'round' // 设置圆角
state.ctxByVideo.lineWidth = props.lineWidth // 设置粗细
state.ctxByVideo.shadowBlur = 1;
state.ctxByVideo.shadowColor = props.color;
state.ctxByVideo.clearRect(0, 0, state.myCanvasByVideo.width, state.myCanvasByVideo.height); // 清空
if (state.drawStepTimer) {
clearTimeout(state.drawStepTimer)
}
if (state.drawLineTimer) {
clearTimeout(state.drawLineTimer)
}
for (let j = 0; j < state.nowPoints.length; j++) {
state.indexStep = j
state.ctxByVideo.beginPath();
state.timeout = 0
if (j !== 0) {
if (state.nowPoints[j].length && state.nowPoints[j - 1].length) {
state.timeout = state.nowPoints[j][0].time - state.nowPoints[j - 1][state.nowPoints[j - 1].length - 1].time
}
}
await drawStepByRocket(state.nowPoints[j], 50)
}
state.isRocket = false
}
//答题笔迹
const playVideo = async () => {
if (state.isRocket) {
state.isPlayVideo = false
clearInterval(state.nowTimer)
clearTimeout(state.drawLineTimer)
clearTimeout(state.drawStepTimer)
state.myCanvasByVideo.width = state.myCanvasByVideo.width // 清空
state.canvasHistory = null
// 清空操作
state.nowTime = 0
state.isPlayVideo = false
state.isStartVideo = false
state.indexStep = 0
state.indexPoint = 0
clearInterval(state.nowTimer)
state.canvasHistory = null
if (state.nowTimer) {
clearInterval(state.nowTimer)
}
if (state.drawStepTimer) {
clearTimeout(state.drawStepTimer)
}
if (state.drawLineTimer) {
clearTimeout(state.drawLineTimer)
}
}
state.isRocket = false
state.isPlayVideo = true
state.isStartVideo = true
state.ctxByVideo.strokeStyle = props.color
state.ctxByVideo.translate(0.5, 0.5) // 抗锯齿（好像没得卵用）
state.ctxByVideo.antialias = 'smooth' // 抗锯齿（好像没得卵用）
state.ctxByVideo.imageSmoothingEnabled = true // 抗锯齿（好像没得卵用）
state.ctxByVideo.lineJoin = 'round' // 设置圆角
state.ctxByVideo.lineWidth = props.lineWidth // 设置粗细
state.ctxByVideo.shadowBlur = 1;
state.ctxByVideo.shadowColor = props.color;
state.ctxByVideo.clearRect(0, 0, state.myCanvasByVideo.width, state.myCanvasByVideo.height); // 清空
state.nowTimer = setInterval(()=> {
if (state.nowTime < state.allTime) {
state.nowTime++
}
}, 1000 / state.nowSpeed)
for (let j = 0; j < state.nowPoints.length; j++) {
state.indexStep = j
state.ctxByVideo.beginPath();
state.timeout = 0
if (j !== 0) {
if (state.nowPoints[j].length && state.nowPoints[j - 1].length) {
state.timeout = state.nowPoints[j][0].time - state.nowPoints[j - 1][state.nowPoints[j - 1].length - 1].time
}
}
await drawStep(state.nowPoints[j], props.lineWidth / state.nowSpeed)
}
state.nowTime = JSON.parse(JSON.stringify(state.allTime))
state.isPlayVideo = false
clearInterval(state.nowTimer)
}
// 暂停播放
const pauseVideo = () => {
state.isPlayVideo = false
clearInterval(state.nowTimer)
clearTimeout(state.drawLineTimer)
clearTimeout(state.drawStepTimer)
state.ctxByVideo.stroke()
}
// 继续播放
const continueVideo = async () => {
if (state.nowTime === state.allTime) { // 播放完了重新播放
state.nowTime = JSON.parse(JSON.stringify(state.allTime))
pauseVideo()
state.isPlayVideo = false
state.isStartVideo = false
state.isRocket = true
return
}
state.isPlayVideo = true
let startIndex = JSON.parse(JSON.stringify(state.indexStep))
state.nowTimer = setInterval(()=> {
if (state.nowTime < state.allTime) {
state.nowTime++
}
}, 1000 / state.nowSpeed)
console.log('从这开始', state.indexStep, state.nowPoints)
// state.ctx.moveTo(0, 0)
// state.ctx.lineTo(500, 500)
// state.ctx.stroke();
// state.ctx.closePath();
for (let j = startIndex; j < state.nowPoints.length; j++) {
state.indexStep = j
state.timeout = 0
if (j !== 0) {
if (state.nowPoints[j].length && state.nowPoints[j - 1].length) {
state.timeout = state.nowPoints[j][0].time - state.nowPoints[j - 1][state.nowPoints[j - 1].length - 1].time
}
}
await drawStep(state.nowPoints[j], state.timeout / state.nowSpeed)
}
state.nowTime = JSON.parse(JSON.stringify(state.allTime))
clearInterval(state.nowTimer)
state.isPlayVideo = false
}
// 改变进度条(根据当前时间获取)
const changeVideoSilder = () => {
console.log('改变了')
clearInterval(state.nowTimer)
clearTimeout(state.drawLineTimer)
clearTimeout(state.drawStepTimer)
state.ctxByVideo.clearRect(0, 0, state.myCanvasByVideo.width, state.myCanvasByVideo.height); // 清空
state.ctxByVideo.strokeStyle = props.color
state.ctxByVideo.translate(0.5, 0.5) // 抗锯齿（好像没得卵用）
state.ctxByVideo.antialias = 'smooth' // 抗锯齿（好像没得卵用）
state.ctxByVideo.imageSmoothingEnabled = true // 抗锯齿（好像没得卵用）
state.ctxByVideo.lineJoin = 'round' // 设置圆角
state.ctxByVideo.lineWidth = props.lineWidth // 设置粗细
state.ctxByVideo.shadowBlur = 1;
state.ctxByVideo.shadowColor = props.color;
let allTime = 0
// 直接把进度条当前定位之前的画出来不加任何延时
here: for (let i = 0;i < state.nowPoints.length;i++) {
state.ctxByVideo.beginPath();
if (i) {
allTime += (state.nowPoints[i][0].time - state.nowPoints[i - 1][state.nowPoints[i - 1].length - 1].time)
// console.log('1级时间', allTime, i)
}
for (let j = 0;j < state.nowPoints[i].length;j++) {
if (j) {
allTime += (state.nowPoints[i][j].time - state.nowPoints[i][j - 1].time)
// console.log('2级时间', allTime, i, j)
}
if (j !== state.nowPoints[i].length - 1) {
state.ctxByVideo.moveTo(state.nowPoints[i][j].x / state.gdbl, state.nowPoints[i][j].y / state.gdbl)
state.ctxByVideo.lineTo(state.nowPoints[i][j+1].x / state.gdbl, state.nowPoints[i][j+1].y / state.gdbl)
state.ctxByVideo.stroke();
state.ctxByVideo.closePath();
}
if (allTime >= (state.nowTime * 1000)) {
state.indexStep = i
state.indexPoint = j
break here
}
}
}
if (state.isPlayVideo) { // 如果是播放状态 则继续播放
continueVideo()
}
}
const drawStep = (data:any, time:any) => {
return new Promise((resolve) => {
state.drawStepTimer = setTimeout(async () => {
let startIndex = JSON.parse(JSON.stringify(state.indexPoint))
for (let i = startIndex; i < data.length - 1; i++) {
state.indexPoint = i
let timeLine = data[i + 1].time - data[i].time
if (timeLine) { // 点阵笔有很多点位不同但时间相同的点 不做异步处理
await drawLine(data[i].x / state.gdbl, data[i].y / state.gdbl, data[i + 1].x / state.gdbl, data[i + 1].y / state.gdbl, (data[i].x + data[i + 1].x) / 2 / state.gdbl, (data[i].y + data[i + 1].y) / 2 / state.gdbl, timeLine / state.nowSpeed)
} else {
state.ctxByVideo.moveTo(data[i].x / state.gdbl, data[i].y / state.gdbl)
state.ctxByVideo.lineTo(data[i + 1].x / state.gdbl, data[i + 1].y / state.gdbl)
state.ctxByVideo.stroke()
state.ctxByVideo.closePath()
}
}
state.indexPoint = 0
state.ctxByVideo.stroke();
resolve()
}, time)
})
}
// 相同速度播放
const drawStepByRocket = (data:any, time:any) => {
return new Promise((resolve) => {
state.drawStepTimer = setTimeout(async () => {
let startIndex = JSON.parse(JSON.stringify(state.indexPoint))
for (let i = startIndex; i < data.length - 1; i++) {
state.indexPoint = i
let timeLine = data[i + 1].time - data[i].time
if (timeLine) { // 点阵笔有很多点位不同但时间相同的点 不做异步处理
await drawLine(data[i].x / state.gdbl, data[i].y / state.gdbl, data[i + 1].x / state.gdbl, data[i + 1].y / state.gdbl, (data[i].x + data[i + 1].x) / 2 / state.gdbl, (data[i].y + data[i + 1].y) / 2 / state.gdbl, 5)
} else {
state.ctxByVideo.moveTo(data[i].x / state.gdbl, data[i].y / state.gdbl)
state.ctxByVideo.lineTo(data[i + 1].x / state.gdbl, data[i + 1].y / state.gdbl)
state.ctxByVideo.stroke()
state.ctxByVideo.closePath()
}
}
state.indexPoint = 0
state.ctxByVideo.stroke();
resolve()
}, time)
})
}
const drawLine = (x1:any, y1:any, x2:any, y2:any, controlX:any, controlY:any, time:any) => {
return new Promise((resolve) => {
state.drawLineTimer = setTimeout(() => {
state.ctxByVideo.moveTo(x1, y1)
state.ctxByVideo.lineTo(x2, y2)
// state.ctx.quadraticCurveTo(controlX, controlY, x2, y2)
state.ctxByVideo.stroke();
state.ctxByVideo.closePath();
resolve()
}, time)
})
}
// 改变播放速度
const changeSpeed = (speed:any) => {
state.nowSpeed = speed
state.isShowSpeedBox = false
if (state.nowTimer) {
clearInterval(state.nowTimer)
if (state.isPlayVideo) {
state.nowTimer = setInterval(()=> {
if (state.nowTime < state.allTime) {
state.nowTime++
}
}, 1000 / state.nowSpeed)
}
}
}
const getFormatTime = (allSecond:any) => {
let minute:any = 0
let second:any = 0
second = allSecond % 60
if (second < 10) {
second = '0' + second
}
minute = Math.trunc(allSecond / 60)
if (minute < 10) {
minute = '0' + minute
}
return minute + ':' + second
}
const initCanvasByVideo = () => {
state.myCanvasByVideo = document.getElementById("myCanvasByVideo")
state.ctxByVideo = state.myCanvasByVideo.getContext("2d")
}
</script>
<style lang="scss" scoped>
.canvas-video{
width: 100%;
height: 100%;
background: white;
// .myCanvas{
// z-index: 99;
// }
img{
max-width: 100%;
}
}
.btnDiv{
display: flex;
align-items: center;
justify-content: center;
margin-top: 20px;
.playback{
display: flex;
justify-content: space-between;
color: #ffffff;
text-align: center;
padding: 0 20px;
height: 40px;
line-height: 40px;
border-radius: 4px;
border: 1px solid #00B386;
font-size: 20px;
cursor: pointer;
img{
width: 10px;
height: 14px;
margin-top: 7px;
margin-left: 12px;
}
}
.rocket{
margin-top: 3px;
margin-left: 10px;
cursor: pointer;
}
:deep(.mySlider){
width: 500px;
margin-left: 20px;
.el-slider__bar{
border-radius: 17px;
background: #00B386;
}
.el-slider__button{
border: 1px solid #00B386;
}
.el-slider__runway{
border-radius: 17px;
background: #444;
}
}
.myTime{
margin-left: 14px;
color: #A9A9A9;
line-height: 35px;
font-size: 18px;
}
.mySpeed{
cursor: pointer;
position: relative;
border-radius: 2px;
background: #EF8714;
width: 60px;
height: 40px;
line-height: 40px;
text-align: center;
color: #ffffff;
margin: 5px 0 0 20px;
font-size: 18px;
.speedList{
position: absolute;
bottom: 20px;
border-radius: 2px;
background: #232322;
padding: 10px 0;
width: 60px;
.speedItem{
width: 100%;
text-align: center;
margin-bottom: 10px;
color: #FFFFFF;
}
.speedItem.active{
color: #EF8714;
font-size: 20px;
}
.speedItem:last-child{
margin-bottom: 0px;
}
z-index: 2000;
}
}
.slider-warpper {
width: 320px;
height: 16px;
position: absolute;
left: 280px;
// background: #ef9e00 !important;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
.slider-content {
width: 304px;
height: 16px;
background: #2D2D2D;
border: 1px solid rgba(255, 186, 33, 0.16);
border-radius: 22px;
position: relative;
.slider {
border-radius: 22px;
position: absolute;
left: 0;
top: 0;
width: 30px;
height: 16px;
background: #FFBA21;
}
}
.persent {
margin-left: 10px;
color: #FFBA21;
font-size: 18px;
font-weight: 600;
letter-spacing: 1.26px;
}
}
}
.dialog-btn{
display: flex;
justify-content: center;
.btn1{
border: 1px solid #00B386;
background: #00B386;
text-align: center;
margin-right: 50px;
color: #FFF;
color: #fff;
font-size: 18px;
padding: 10px 65px;
cursor: pointer;
&:active{
opacity: 0.8;
}
}
.btn2{
border: 1px solid #00B386;
color: #fff;
font-size: 18px;
text-align: center;
padding: 10px 65px;
cursor: pointer;
&:active{
opacity: 0.8;
}
}
}
</style>三、页面调用
1、vue2
（1）安装 canvasvideo-vue
npm install canvasvideo-vue --save
（2）main.js引入
import { createApp } from 'vue'
import App from './App.vue'
import canvasVideo from "canvasvideo-vue"
import "../node_modules/canvasvideo-vue/canvasVideo-vue.css"
const app = createApp(App)
app.use(canvasVideo)
.mount("#app")（3）页面调用
<canvas-video :width="1220" :height="500" :backgroundColor="'blue'" :color="'red'" :lineWidth="1" :pointData="backPlayList" />
2、vue3
<canvas-video :width="1220" :height="500" :backgroundColor="'blue'" :color="'red'" :lineWidth="1" :pointData="backPlayList" />
<script setup lang="ts">
import { ref } from 'vue'
import CanvasVideo from "./components/CanvasVideo.vue"
const backPlayList = ref<any[]>([])
// backPlayList 去接收处理后台返回的数据
</script>四、数据结构
let datas = [
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]到此这篇关于vue实现画笔回放，canvas转视频播放功能的文章就介绍到这了,更多相关vue canvas视频播放内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！