Question

我正在尝试映射下面图片中的所有数字，我已经完成了。但现在我想根据窗口的宽度动态调整图像大小并进行映射。

enter image description here

这是相关的html：

    <html>

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1"> 
    <title>20 Keys</title> 

    <link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.css" />
    <link rel="stylesheet" type="text/css" href="css/styles.css">

    <script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
    <script src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.js"></script>
    <script src="js/script.js"></script>

</head> 

<body> 
<!-- Start of first page: #home-->
<div data-role="page" id="home" data-theme="b"> 

    <div data-role="header">
        <img src="images/20keyslogo.jpg" width="100%">
    </div><!-- /header -->

    <div class="white" data-role="content" data-theme="b">  

    <img id="imageMaps" src="images/20keys.jpg" usemap="#20Keys" width="100%" alt="Select Key" border="0"/>
        <map id="20Keys" name="20Keys">
            <area shape="circle" alt="Key 1" title="" coords="41,54,31" href="" target="" />
            <area shape="circle" alt="Key 2" title="" coords="41,543,31" href="" target="" />
            <area shape="circle" alt="Key 3" title="" coords="538,543,31" href="" target="" />
            <area shape="circle" alt="Key 4" title="" coords="499,293,31" href="" target="" />
            <area shape="circle" alt="Key 5" title="" coords="484,213,31" href="" target="" />
            <area shape="circle" alt="Key 6" title="" coords="79,293,31" href="" target="" />
            <area shape="circle" alt="Key 7" title="" coords="141,145,31" href="" target="" />
            <area shape="circle" alt="Key 8" title="" coords="483,374,31" href="" target="" />
            <area shape="circle" alt="Key 9" title="" coords="209,99,31" href="" target="" />
            <area shape="circle" alt="Key 10" title="" coords="290,504,31" href="" target="" />
            <area shape="circle" alt="Key 11" title="" coords="289,83,31" href="" target="" />
            <area shape="circle" alt="Key 12" title="" coords="370,99,31" href="" target="" />
            <area shape="circle" alt="Key 13" title="" coords="370,488,31" href="" target="" />
            <area shape="circle" alt="Key 14" title="" coords="95,213,31" href="" target="" />
            <area shape="circle" alt="Key 15" title="" coords="438,442,31" href="" target="" />
            <area shape="circle" alt="Key 16" title="" coords="438,145,31" href="" target="" />
            <area shape="circle" alt="Key 17" title="" coords="95,374,31" href="" target="" />
            <area shape="circle" alt="Key 18" title="" coords="141,442,31" href="" target="" />
            <area shape="circle" alt="Key 19" title="" coords="209,488,31" href="" target="" />
            <area shape="circle" alt="Key 20" title="" coords="538,45,31" href="" target="" />
        </map>
        <p><a href="#two" data-role="button">Interactions between any two keys</a></p>  
        <p><a href="#about" data-role="button">About 20 Keys</a></p>    
        <p><a href="http://www.20keysglobal.com" data-role="button">Visit International 20 Keys Website</a></p>                 
        <p><a href="#register" data-role="button" data-rel="dialog" data-transition="pop">Register for Pro Version</a></p>
        <p><a href="mailto:christiaan.grove@odi.co.za" data-role="button">Make Suggestion for Improvement</a></p>
    </div><!-- /content -->

    <div data-role="footer" data-theme="d">

        <p class="margin">
        <a href="#home" data-rel="back" data-role="button" data-inline="true" data-icon="gear">Settings</a>
        </p>

    </div><!-- /footer -->
</div><!-- /page one -->

这是我在Dynamically resizing Image-maps and images的最佳答案中使用的javascript（感谢Teemo）：

window.onload = function () {
    var ImageMap = function (map) {
            var n,
                areas = map.getElementsByTagName('area'),
                len = areas.length,
                coords = [],
                previousWidth = 604;
            for (n = 0; n < len; n++) {
                coords[n] = areas[n].coords.split(',');
            }
            this.resize = function () {
                var n, m, clen,
                    x = document.body.clientWidth / previousWidth;
                for (n = 0; n < len; n++) {
                    clen = coords[n].length;
                    for (m = 0; m < clen; m++) {
                        coords[n][m] *= x;
                    }
                    areas[n].coords = coords[n].join(',');
                }
                previousWidth = document.body.clientWidth;
                return true;
            };
            window.onresize = this.resize;
        },
        imageMap = new ImageMap(document.getElementById('20Keys'));
    imageMap.resize();
    return;
}

图像和地图会根据窗口宽度调整大小，但遗憾的是不如我想要的那样完美。当窗口调整大小时，只有第一个键实际上完全调整大小。对于其余部分，离左上角越远，它就越不准确。

我已经将图像更改为完美的正方形，希望它能解决问题，但事实并非如此。

我在javascript方面经验不足，而且我的数学技能不像以前那样。所有帮助将不胜感激。提前谢谢。

Answer 1

图像的宽度可能不是body的100％。不要使用x计算比例（document.body.clientWidth），而是使用图片的offsetWidth：

x = img.offsetWidth / previousWidth;
                 :
previousWidth = img.offsetWidth;

A live demo at jsFiddle

请注意，只要保持图像的原始比例，图像的纵横比不需要为1：1，两个方向的比例相同。

（原始代码可能与原始问题绑定得太多，而不是通用的多用途地图缩放器。）

Answer 2

您可能会发现我的这个小项目有用，作为一种更通用的解决方案，它还可以处理页面上的非固定宽高比和多个ImageMaps。

https://github.com/davidjbradshaw/imagemap-resizer

调整包含圆的图像映射的大小

2 个答案: