【Tank】2.0 canvas-画布实现

作者: 图恩分类: 编程开发阅读: 299发布时间： 2022-05-11 23:06:48

文件结构

image.png

index.html如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <link rel="icon" type="image/svg+xml" href="favicon.svg"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <title>Vite App</title>
</head>
<body>
<!--<div id="app"></div>-->
<canvas id="canvas" width="600" height="300"  style="overflow: hidden;width: 600px;height: 300px;"></canvas>
<script type="module" src="/src/main.ts"></script>
</body>
</html>

src/style.css

body{
  height: 100vh;
  width: 100vw;
  background-color:#34459e;
  margin: 0;
  padding: 0;
}

src/main.ts

import './style.css'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(

        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
    ) {
        // @ts-ignore
        this.app.fillStyle='#000'
        // @ts-ignore
        this.app.fillRect(0,0,this.width,this.height)

    }
}

const instance = new Blackboard()

效果如下


image.png

修改src/style.css

body {
    height: 100vh;
    width: 100vw;
    background-color: #34459e;
    margin: 0;
    padding: 0;
    display: flex;
    /*主轴*/
    justify-content: center;
    /*交叉轴*/
    align-items: center;
}

画布居中：


image.png

鼠标划线

import './style.css'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = '#fff'
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            this.el.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = '#000'
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
    }
}

export const instance = new Blackboard()
image.png

防止冒泡，优化如下：

......
    // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
......

增加按钮

import './style.css'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns:HTMLDivElement=document.createElement('div')
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = '#fff'
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = '#000'
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        this.el.insertAdjacentElement('afterend',this.btns)
    }
}

export const instance = new Blackboard()
image.png
import './style.css'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns: HTMLDivElement = document.createElement('div')
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btns.insertAdjacentElement('afterbegin', el)
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = '#fff'
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = '#000'
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        this.el.insertAdjacentElement('afterend', this.btns)
    }
}

const instance = new Blackboard()
instance.clear()

修改src/style.css

body {
    height: 100vh;
    width: 100vw;
    background-color: #34459e;
    margin: 0;
    padding: 0;
    display: flex;
    /*按列来排列*/
    flex-direction: column;
    /*主轴*/
    justify-content: center;
    /*交叉轴*/
    align-items: center;
}
image.png

稍微调整一下

......
    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = '#000'
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        this.btns.style.cssText='margin-top:10px'
        this.el.insertAdjacentElement('afterend', this.btns)
    }
......
image.png

背景颜色修改

import './style.css'


const BLACK_BACKGROUND = '#000'
const LINE_COLOR = '#fff'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btn: HTMLDivElement = document.createElement('div'),
        private bgColor: string = BLACK_BACKGROUND,
        private lineColor: string = LINE_COLOR
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btn.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.app.fillStyle = this.bgColor
            // @ts-ignore
            this.app.fillRect(0, 0, this.width, this.height)
        })
    }

    // 背景颜色修改
    public setBgColor(color: string) {
        this.bgColor = color
        // @ts-ignore
        this.app.fillStyle = color
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
        return this
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = this.lineColor
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = this.bgColor
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        this.btn.style.cssText = 'margin-top:10px'
        this.el.insertAdjacentElement('afterend', this.btn)
    }
}

const instance = new Blackboard()
instance.clear()
instance.setBgColor("#16a085")
image.png

修改粉笔颜色

import './style.css'


const BLACK_BACKGROUND = '#000'
const LINE_COLOR = '#fff'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns: HTMLDivElement = document.createElement('div'),
        private bgColor: string = BLACK_BACKGROUND,
        private lineColor: string = LINE_COLOR
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.app.fillStyle = this.bgColor
            // @ts-ignore
            this.app.fillRect(0, 0, this.width, this.height)
        })
    }

    // 背景颜色修改
    public setBgColor(color: string) {
        this.bgColor = color
        // @ts-ignore
        this.app.fillStyle = color
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
        return this
    }

    // 修改粉笔颜色
    public setLineColor() {
        const colors = ['#fff', "#1abc9c", "#f1c40f"];
        //定义一个容器
        const container = document.createElement('div')
        // 增加样式
        
        colors.forEach(item => {
            const div = document.createElement('div')
            div.style.cssText = `width:20px;height:20px;background:${item}`
            container.insertAdjacentElement('afterbegin', div)
        })
        this.btns.insertAdjacentElement('beforeend', container)
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = this.lineColor
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = this.bgColor
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        this.btns.style.cssText = 'margin-top:10px'
        this.el.insertAdjacentElement('afterend', this.btns)
    }
}

const instance = new Blackboard()
instance.clear()
instance.setBgColor("#16a085")
instance.setLineColor()
image.png

调整css样式

import './style.css'


const BLACK_BACKGROUND = '#000'
const LINE_COLOR = '#fff'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns: HTMLDivElement = document.createElement('div'),
        private bgColor: string = BLACK_BACKGROUND,
        private lineColor: string = LINE_COLOR
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.app.fillStyle = this.bgColor
            // @ts-ignore
            this.app.fillRect(0, 0, this.width, this.height)
        })
    }

    // 背景颜色修改
    public setBgColor(color: string) {
        this.bgColor = color
        // @ts-ignore
        this.app.fillStyle = color
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
        return this
    }

    // 修改粉笔颜色
    public setLineColor() {
        const colors = ['#fff', "#1abc9c", "#f1c40f","#9b59b6"];
        //定义一个容器
        const container = document.createElement('div')
        // 增加样式
        container.classList.add('line-color-container')
        colors.forEach(item => {
            const div = document.createElement('div')
            div.style.cssText = `width:20px;height:20px;background:${item}`
            container.insertAdjacentElement('afterbegin', div)
        })
        this.btns.insertAdjacentElement('beforeend', container)
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = this.lineColor
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = this.bgColor
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        // this.btns.style.cssText = 'margin-top:10px'
        this.btns.classList.add('btns')
        this.el.insertAdjacentElement('afterend', this.btns)
    }
}

const instance = new Blackboard()
instance.clear()
instance.setBgColor("#16a085")
instance.setLineColor()

修改src/style.css

body {
    height: 100vh;
    width: 100vw;
    background-color: #34459e;
    margin: 0;
    padding: 0;
    display: flex;
    /*按列来排列*/
    flex-direction: column;
    /*主轴*/
    justify-content: center;
    /*交叉轴*/
    align-items: center;
}

.btns {
    margin-top: 10px;
    display: flex;
    /*主轴*/
    align-items: center;
}

.line-color-container {
    display: flex;
}
image.png

增加事件

......
    // 修改粉笔颜色
    public setLineColor() {
        const colors = ['#fff', "#1abc9c", "#f1c40f", "#9b59b6"];
        //定义一个容器
        const container = document.createElement('div')
        // 增加样式
        container.classList.add('line-color-container')
        colors.forEach(item => {
            const div = document.createElement('div')
            div.style.cssText = `width:20px;height:20px;background:${item}`
            container.insertAdjacentElement('afterbegin', div)

            // 循环时添加事件
            div.addEventListener('click', () => this.lineColor = item)
        })
        this.btns.insertAdjacentElement('beforeend', container)
    }
......
image.png

橡皮擦、铅笔

import './style.css'


const BLACK_BACKGROUND = '#000'
const LINE_COLOR = '#fff'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns: HTMLDivElement = document.createElement('div'),
        private bgColor: string = BLACK_BACKGROUND,
        private lineColor: string = LINE_COLOR
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.app.fillStyle = this.bgColor
            // @ts-ignore
            this.app.fillRect(0, 0, this.width, this.height)
        })
    }

    // 背景颜色修改
    public setBgColor(color: string) {
        this.bgColor = color
        // @ts-ignore
        this.app.fillStyle = color
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
        return this
    }

    // 修改粉笔颜色
    public setLineColor() {
        const colors = ['#fff', "#1abc9c", "#f1c40f", "#9b59b6"];
        //定义一个容器
        const container = document.createElement('div')
        // 增加样式
        container.classList.add('line-color-container')
        colors.forEach(item => {
            const div = document.createElement('div')
            div.style.cssText = `width:20px;height:20px;background:${item}`
            container.insertAdjacentElement('afterbegin', div)

            // 循环时添加事件
            div.addEventListener('click', () => {
                this.lineColor = item;
                // @ts-ignore
                this.app.lineWidth = 1
            })
        })
        this.btns.insertAdjacentElement('beforeend', container)
    }

    // 橡皮擦功能
    public erase() {
        const el = document.createElement('button')
        el.innerText = '橡皮擦'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.lineColor = this.bgColor
            // 线的宽度
            // @ts-ignore
            this.app.lineWidth = 10
        })
    }

    // 铅笔功能
    public draw() {
        const el = document.createElement('button')
        el.innerText = '铅笔'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.lineColor = "white"
            // 线的宽度
            // @ts-ignore
            this.app.lineWidth = 1
        })
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = this.lineColor
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = this.bgColor
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        // this.btns.style.cssText = 'margin-top:10px'
        this.btns.classList.add('btns')
        this.el.insertAdjacentElement('afterend', this.btns)
    }
}

const instance = new Blackboard()
instance.clear()
instance.erase()
instance.draw()

// instance.setBgColor("#16a085")
instance.setLineColor()
image.png

画布截图

import './style.css'


const BLACK_BACKGROUND = '#000'
const LINE_COLOR = '#fff'

//写构造函数
class Blackboard {
    //public/private :写就会变为对象属性，不然只是形参
    constructor(
        public el = document.querySelector<HTMLCanvasElement>("#canvas")!,
        private app = el.getContext("2d"),
        private width: number = el.width,
        private height: number = el.height,
        private btns: HTMLDivElement = document.createElement('div'),
        private bgColor: string = BLACK_BACKGROUND,
        private lineColor: string = LINE_COLOR
    ) {
        this.initCanvas()
        // 绑定事件
        this.bindEvent();


    }

    // 清屏操作
    public clear() {
        const el = document.createElement('button')
        el.innerText = '清屏'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.app.fillStyle = this.bgColor
            // @ts-ignore
            this.app.fillRect(0, 0, this.width, this.height)
        })
        return this
    }

    // 背景颜色修改
    public setBgColor(color: string) {
        this.bgColor = color
        // @ts-ignore
        this.app.fillStyle = color
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)
        return this
    }

    // 修改粉笔颜色
    public setLineColor() {
        const colors = ['#fff', "#1abc9c", "#f1c40f", "#9b59b6"];
        //定义一个容器
        const container = document.createElement('div')
        // 增加样式
        container.classList.add('line-color-container')
        colors.forEach(item => {
            const div = document.createElement('div')
            div.style.cssText = `width:20px;height:20px;background:${item}`
            container.insertAdjacentElement('afterbegin', div)

            // 循环时添加事件
            div.addEventListener('click', () => {
                this.lineColor = item;
                // @ts-ignore
                this.app.lineWidth = 1
            })
        })
        this.btns.insertAdjacentElement('beforeend', container)
        return this
    }

    // 橡皮擦功能
    public erase() {
        const el = document.createElement('button')
        el.innerText = '橡皮擦'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.lineColor = this.bgColor
            // 线的宽度
            // @ts-ignore
            this.app.lineWidth = 10
        })
        return this
    }

    // 铅笔功能
    public draw() {
        const el = document.createElement('button')
        el.innerText = '铅笔'
        this.btns.insertAdjacentElement('afterbegin', el)

        //点击事件
        el.addEventListener('click', () => {
            // @ts-ignore
            this.lineColor = "white"
            // 线的宽度
            // @ts-ignore
            this.app.lineWidth = 1
        })
        return this
    }

    // 截图保存
    public printScreen() {
        const el = document.createElement('button')
        el.innerText = '截图保存'
        this.btns.insertAdjacentElement('afterbegin', el)

        const img = document.createElement('img')
        //点击事件
        el.addEventListener('click', () => {
            img.src = this.el.toDataURL('image/jpeg')
            img.classList.add('img-print-screen')
        })
        this.btns.insertAdjacentElement('afterend', img)
        return this
    }

    // 绑定事件
    private bindEvent() {
        // 创建唯一实例
        const callback = this.drawLine.bind(this)
        // 鼠标按下事件
        this.el.addEventListener('mousedown', () => {
            // @ts-ignore
            this.app.beginPath()
            // @ts-ignore
            this.app.strokeStyle = this.lineColor
            // 鼠标移动事件
            this.el.addEventListener('mousemove', callback)
            // 鼠标松开事件
            document.addEventListener('mouseup', () => {
                // 划线
                this.el.removeEventListener('mousemove', callback)
            })
        })
    }

    private drawLine(event: MouseEvent) {
        // @ts-ignore
        this.app.lineTo(event.offsetX, event.offsetY)
        // @ts-ignore
        this.app.stroke()
    }

    private initCanvas() {
        // @ts-ignore
        this.app.fillStyle = this.bgColor
        // @ts-ignore
        this.app.fillRect(0, 0, this.width, this.height)

        // this.btns.style.cssText = 'margin-top:10px'
        this.btns.classList.add('btns')
        this.el.insertAdjacentElement('afterend', this.btns)
    }
}

const instance = new Blackboard()
instance.clear()//清屏操作
    .erase()//橡皮擦功能
    .draw()//铅笔功能
    .printScreen()//截图保存
    // .setBgColor("#16a085")
    .setLineColor()//修改粉笔颜色

修改src/style.css

body {
    height: 100vh;
    width: 100vw;
    background-color: #34459e;
    margin: 0;
    padding: 0;
    display: flex;
    /*按列来排列*/
    flex-direction: column;
    /*主轴*/
    justify-content: center;
    /*交叉轴*/
    align-items: center;
}

.btns {
    margin-top: 10px;
    display: flex;
    /*主轴*/
    align-items: center;
}

.line-color-container {
    display: flex;
}

.img-print-screen {
    margin-top: 15px;
    width: 300px;
    height: 150px;
}
image.png

该图片可以右击保存。

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转载请注明原文及出处：【Tank】2.0 canvas-画布实现

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