canvas实现类似钢笔区域选择变色效果代码-html代码-BFW代码库

canvas实现类似钢笔区域选择变色效果代码

代码语言：html

所属分类：其他

代码描述：canvas实现类似钢笔区域选择变色效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html>
<head>
  <title>Canvas Pen Selection Tool</title>
  <style>
    canvas {
      border: 1px solid black;
    }
  </style>
</head>
<body>

<canvas id="canvas" width="500" height="500"></canvas>

<script>
  var canvas = document.getElementById('canvas');
  var ctx = canvas.getContext('2d');
  var isDrawing = false;
  var startPoint = { x: 0, y: 0 };
  var points = [];

  canvas.addEventListener('mousedown', function(e) {
    isDrawing = true;
    startPoint.x = e.clientX - canvas.offsetLeft;
    startPoint.y = e.clientY - canvas.offsetTop;
    points.push({ x: startPoint.x, y: startPoint.y });
    ctx.moveTo(startPoint.x, startPoint.y);
  });

  canvas.addEventListener('mousemove', fun.........完整代码请登录后点击上方下载按钮下载查看