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
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