canvas画图，拖动画好的椭圆边框

最新推荐文章于 2025-06-04 15:49:34 发布

longlongago~~

最新推荐文章于 2025-06-04 15:49:34 发布

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分类专栏： canvas涂鸦插件文章标签： javascript css html 前端

本文链接：https://blog.youkuaiyun.com/weixin_44434938/article/details/137146600

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提示：canvas画图，拖动画好的椭圆边框

文章目录

前言
一、拖动画好的椭圆边框
总结

前言

一、拖动画好的椭圆边框

test.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>canvas跟随鼠标移动画透明线</title>
    <style>
        div,canvas,img{
   
            user-select: none;
        }
        .my_canvas,.bg_img{
   
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
        }
        .cf{
   
            content: '';
            display: block;
            overflow: hidden;
            clear: both;
        }
        .fl{
   
            float: left;
        }
        .fr{
   
            float: right;
        }
        .bg_img{
   
            width: 674px;
            height: 495px;
            background: #ddd;
        }
        .img_tools{
   
            position: absolute;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            border: 1px solid #eee;
            border-radius: 64px;
            height: 64px;
            line-height: 64px;
            box-sizing: border-box;
            padding: 15px 20px 0;
        }
        .img_tool{
   
           height: 32px;
           line-height: 32px;
           color: #000;
           font-size: 14px;
           text-align: center;
           width: 80px;
           border: 1px solid #ddd;
           border-radius: 32px;
           margin-right: 10px;
           cursor: pointer;
           position: relative;
        }
        .img_tool_active{
   
            color: #409EFF;
            border: 1px solid #409EFF;
        }
        .show_history{
   
            position: absolute;
            bottom:0;
            left: 50%;
            transform: translateX(-50%);
        }
        .show_history>img{
   
            width: 120px;
            margin-right: 10px;
            border: 1px solid #eee;
            border-radius: 4px;
        }
        .canvas_text{
   
            width: 120px;
            height: 32px;
            line-height: 32px;
            position: absolute;
            top: 0;
            left: 0;
            border: 1px solid #c0c0c0;
            border-radius: 4px;
            font-size: 16px;
            outline: none;
            background: none;
            display: none;
            font-family: Arial, Helvetica, sans-serif;
            padding-left: 0;
            letter-spacing: 0;
        }
    </style>
</head>
<body>
    <div class="bg_img"></div>
    <canvas id="myCanvasBot" class="my_canvas" width="674" height="495"></canvas>
    <canvas id="myCanvasTop" class="my_canvas" width="674" height="495"></canvas>
    <div class="img_tools cf">
        <!-- <div class="img_tool img_tool_active fl" onclick="changeType('curve',this)">涂鸦</div> -->
        <!-- <div class="img_tool fl" onclick="changeType('line',this)">直线</div> -->
        <div class="img_tool fl" onclick="changeType('rect',this)">矩形</div>
        <div class="img_tool fl" onclick="changeType('ellipse',this)">圆形</div>
        <!-- <div class="img_tool fl" onclick="changeType('eraser',this)">橡皮擦</div> -->
        <!-- <div class="img_tool fl" onclick="changeType('text',this)">文字</div> -->
        <!-- <div class="img_tool fl" onclick="changeType('revoke',this)">撤销</div> -->
        <!-- <div class="img_tool fl" onclick="changeType('restore',this)">恢复</div>

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