Html在图片上划一个矩形区域，并且获取区域坐标
1，直接上代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>划矩形示例</title>
<style>
/* 设置父容器的相对定位，以便子元素使用绝对定位 */
.container {
position: relative;
display: inline-block;
}
/* 绘制选框的样式 */
.selection-box {
position: absolute;
border: 2px solid red;
background-color: rgba(255, 0, 0, 0.3); /* 半透明红色 */
pointer-events: none; /* 禁止选框阻挡鼠标事件 */
}
</style>
</head>
<body>
<div class="container">
<img id="myImage" src="https://img-blog.csdnimg.cn/img_convert/7681ee31ef81fa87f986bf340bebf912.png" alt="Your Image" width="600">
<div id="selectionBox" class="selection-box">
<span id="positionId"></span>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function () {
var isMouseDown = false;
var startX, startY, endX, endY;
$('#myImage').mousedown(function (e) {
e.preventDefault(); // 阻止默认的鼠标事件（如拖动图片）
isMouseDown = true;
startX = e.pageX - $(this).offset().left;
startY = e.pageY - $(this).offset().top;
});
$(document).mousemove(function (e) {
e.preventDefault(); // 阻止默认的鼠标事件（如选择文本或拖动元素）
if (isMouseDown) {
endX = e.pageX - $('#myImage').offset().left;
endY = e.pageY - $('#myImage').offset().top;
var width = endX - startX;
var height = endY - startY;
$('#selectionBox').css({
left: startX,
top: startY,
width: width,
height: height
});
}
});
$(document).mouseup(function () {
isMouseDown = false;
var imageOffset = $('#myImage').offset();
var relativeX1 = startX;
var relativeY1 = startY;
var relativeX2 = endX;
var relativeY2 = endY;
// 根据绘制方向调整顶点坐标
if (relativeX2 < relativeX1) {
var temp = relativeX1;
relativeX1 = relativeX2;
relativeX2 = temp;
}
if (relativeY2 < relativeY1) {
var temp = relativeY1;
relativeY1 = relativeY2;
relativeY2 = temp;
}
// 计算四个顶点的坐标
var topLeftX = relativeX1;
var topLeftY = relativeY1;
var topRightX = relativeX2;
var topRightY = relativeY1;
var bottomLeftX = relativeX1;
var bottomLeftY = relativeY2;
var bottomRightX = relativeX2;
var bottomRightY = relativeY2;
console.log('选框四个顶点坐标：');
console.log('左上角 (' + topLeftX + ', ' + topLeftY + ')');
console.log('右上角 (' + topRightX + ', ' + topRightY + ')');
console.log('左下角 (' + bottomLeftX + ', ' + bottomLeftY + ')');
console.log('右下角 (' + bottomRightX + ', ' + bottomRightY + ')');
$('#positionId').text('左上角 (' + topLeftX + ', ' + topLeftY + ')');
});
});
</script>
</body>
</html>
原文地址：https://blog.csdn.net/zxb11c/article/details/140684224
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