我目前正在尝试在我的网站上制作一个图像地图,它将根据窗口的大小调整大小...我想知道是否有办法用 HTML 来做到这一点,或者我是否必须用 Javascript 来做到这一点,或者另一种语言。
<div style="text-align:center; width:1920px; margin-left:auto; margin-right:auto;">
<img id="Image-Maps_5201211070133251" src="Site.png" usemap="#Image-Maps_5201211070133251" border="0" width="1920" height="1080" alt="" />
<map id="_Image-Maps_5201211070133251" name="Image-Maps_5201211070133251">
<area shape="poly" coords="737,116,1149,118,944,473," href="http://essper.bandcamp.com" alt="Bandcamp" title="Bandcamp" />
<area shape="poly" coords="1006,589,1418,590,1211,945," href="http://soundcloud.com/essper" alt="Soundcloud" title="Soundcloud" />
<area shape="poly" coords="502,590,910,591,708,944," href="http://facebook.com/the.essper" alt="Facebook" title="Facebook" />
</map>
我编写了一个小库来保持 imageMap 缩放为可调整大小的图像,因此地图在图像缩放时保持同步。当您想要映射百分比缩放图像等时很有用。
它可以与或不与 jQuery 一起使用。
https://github.com/davidjbradshaw/imagemap-resizer
你可以看到它正在运行。
如果您最终使用 JavaScript 完成该任务,这里有一个跨浏览器代码片段,用于调整
MAP
元素中所有区域的大小。
window.onload = function () {
var ImageMap = function (map) {
var n,
areas = map.getElementsByTagName('area'),
len = areas.length,
coords = [],
previousWidth = 1920;
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('map_ID'));
imageMap.resize();
}
previousWidth
必须等于原始图像的宽度。您还需要在 HTML 中使用一些相对单位:
<div style="width:100%;">
<img id="Image-Maps_5201211070133251" src="Site.png" usemap="#Image-Maps_5201211070133251" border="0" width="100%" alt="" />
jsFiddle 的工作演示。如果你在 IE 中打开 fiddle,单击它们时实际上可以看到 AREA
。
function mapResizer(maps) {
if (!maps) {maps = document.getElementsByTagName('map');}
for (const map of maps) {
map.img = document.querySelectorAll(`[usemap="#${map.name}"]`)[0];
map.areas = map.getElementsByTagName('area');
for (const area of map.areas) {
area.coordArr = area.coords.split(',');
}
}
function resizeMaps() {
for (const map of maps) {
const scale = map.img.offsetWidth / (map.img.naturalWidth || map.img.width);
for (const area of map.areas) {
area.coords = area.coordArr.map(coord => Math.round(coord * scale)).join(',');
}
}
}
window.addEventListener('resize', () => resizeMaps());
resizeMaps();
}
if (document.readyState == 'complete') {
mapResizer();
} else {
window.addEventListener('load', () => mapResizer());
}
class ResponsiveImageMap {
constructor(map, img, width) {
this.img = img;
this.originalWidth = width;
this.areas = [];
for (const area of map.getElementsByTagName('area')) {
this.areas.push({
element: area,
originalCoords: area.coords.split(',')
});
}
window.addEventListener('resize', e => this.resize(e));
this.resize();
}
resize() {
const ratio = this.img.offsetWidth / this.originalWidth;
for (const area of this.areas) {
const newCoords = [];
for (const originalCoord of area.originalCoords) {
newCoords.push(Math.round(originalCoord * ratio));
}
area.element.coords = newCoords.join(',');
}
return true;
};
}
用途:
var map = document.getElementById('myMapId');
var image = document.getElementById('myImageId');
new ResponsiveImageMap(map, image, 800);
使用 SVG 创建动态图像映射是非常容易的。
这不需要任何编程。
这里是 Illustrator 的说明 (只需几秒钟):
<img id="paredea" usemap="#PAREDE-A" src="https://i.imgur.com/o9nrUMR.png">
<map name="PAREDE-A">
<area id="paredea0" shape="rect" onclick="alert('colmeia A')">
<area id="paredea1" shape="rect" onclick="alert('colmeia B')">
<area id="paredea2" shape="rect" onclick="alert('colmeia C')">
<area id="paredea3" shape="rect" onclick="alert('colmeia D')">
<area id="paredea4" shape="rect" onclick="alert('colmeia E')">
<area id="paredea5" shape="rect" onclick="alert('comeia F')">
<area id="paredea6" shape="rect" onclick="alert('colmeia G')">
<area id="paredea7" shape="rect" onclick="alert('colmeia H')">
<area id="paredea8" shape="rect" onclick="alert('colmeia I')">
<area id="paredea9" shape="rect" onclick="alert('colmeia J')">
<area id="paredea10" shape="rect" onclick="alert('colmeia K')">
<area id="paredea11" shape="rect" onclick="alert('colmeia L')">
<area id="paredea12" shape="rect" onclick="alert('colmeia M')">
<area id="paredea13" shape="rect" onclick="alert('colmeia N')">
<area id="paredea14" shape="rect" onclick="alert('colmeia O')">
</map>
<script>
var coordsA = [];
coordsA[0] = "0,0,200,130";
coordsA[1] = "200,0,400,130";
coordsA[2] = "400,0,600,130";
coordsA[3] = "600,0,800,130";
coordsA[4] = "800,0,1000,130";
coordsA[5] = "0,160,200,240";
coordsA[6] = "200,160,400,240";
coordsA[7] = "400,160,600,240";
coordsA[8] = "600,160,800,240";
coordsA[9] = "800,160,1000,240";
coordsA[10] = "0,270,200,400";
coordsA[11] = "200,270,400,400";
coordsA[12] = "400,270,600,400";
coordsA[13] = "600,270,800,400";
coordsA[14] = "800,270,1000,400";
function setcoords(areaid, totalOfAreas) {
document.getElementById('paredea').style.width = "auto";
var width1 = document.getElementById('paredea').width;
document.getElementById('paredea').style.width = "100%";
var width2 = document.getElementById('paredea').width;
var ratio = width2 / width1;
for (var i = 0; i < totalOfAreas; i++) {
var temp = coordsA[i].split(",");
var newcoords = "";
for (var j = 0; j < temp.length; j++) {
temp[j] *= ratio;
newcoords += temp[j] + ",";
}
newcoords = newcoords.substr(0, newcoords.length - 1);
document.getElementById(areaid + i).coords = newcoords;
}
}
window.onload = function () {
setcoords("paredea", 15);
};
window.onresize = function () {
setcoords("paredea", 15);
};
</script>
data-original-coords
属性,该属性具有原始图片的
coords
$(function () {
function adjeustCoords() {
var image=$('img'); //change that to your image selector
var originalWidth=image[0].naturalWidth;
var currentWidth=image.width();
var ratio=currentWidth/originalWidth;
$("map area").each(function(){
//change that to your area selector
var coords=$(this).attr('data-original-coords').split(',');
coords = coords.map(function (x) {
return Math.round(x*ratio);
//i don't know if all browsers can accept floating point so i round the result
});
$(this).attr('coords',coords.join());
});
}
adjeustCoords();
$(window).resize(function(){
adjeustCoords();
});
});
这适用于 chrome、firefox 和边缘最少版本
background-position;
属性来移动图像。这是一种有效的页面优化技术。
function wrap ( img, map ) {
var originalCoords = [ ],
test = new Image();
for ( var i = 0; i < map.areas.length; ++i ) {
var coords = map.areas[i].coords;
originalCoords.push( coords.split( "," ).map( parseFloat ) );
}
function resize () {
var ratio = img.width / test.width;
for ( var i = 0; i < map.areas.length; ++i ) {
map.areas[i].coords = originalCoords[i].map( function ( n ) {
return ratio * n;
} ).join( "," );
}
}
test.addEventListener( "load", function () {
window.addEventListener( "resize", resize, false );
resize();
}, false );
test.src = img.src;
}
var imgs = document.querySelectorAll( "img[usemap]" );
for ( var i = 0; i < imgs.length; ++i ) {
var map = document.querySelector( "map[name=" + imgs[i].useMap.substring( 1 ) + "]" );
wrap( imgs[i], map );
}
background-size
和所有其他 CSS 属性大小和位置,我可以从单个图像映射中获取多个图像大小。以下 CSS 用于包含多个社交网络图像的 ImageMap。使用 CSS,我可以拉出单个 Twitter 图标的三种不同大小。
.twitterIcon64 { /* Actual Size */
background-size: 300px 282px;
background: url('/images/social-media-icons.png') no-repeat -18px -109px;
width: 64px;
height: 64px;
}
.twitterIcon32 { /* 1/2 size */
background-size: 150px 141px;
background: url('/images/social-media-icons.png') no-repeat -9px -54px;
width: 32px;
height: 32px;
}
.twitterIcon21 { /* 1/3 size */
background-size: 100px 94px;
background: url('/images/social-media-icons.png') no-repeat -6px -36px;
width: 22px; /* Round up to avoid truncation */
height: 22px; /* Round up to avoid truncation */
}
这对于媒体查询(非常动态)非常有效。如有必要,可以使用 JavaScript 来选择适当的类别或计算适当的大小。
在 IE 11、Edge、Firefox 和 Chrome 上测试。
export const MapResizer = {
mapResizer : function (comp) {
const map =comp.$refs['image-map'];
if (!map) return;
map.img = document.querySelectorAll(`[usemap="#${map.name}"]`)[0];
if (!map.img) return;
if (map.resized) return; // don't recompute if already done for the given map as we place a listener
map.resized = true;
comp.areas = map.getElementsByTagName('area');
for (const area of comp.areas) {
area.coordArr = area.coords.split(',');
}
function resizeMaps() {
const scale = map.img.offsetWidth / (map.img.naturalWidth || map.img.width);
for (const area of comp.areas) {
area.coords = area.coordArr.map(coord => Math.round(coord * scale)).join(',');
}
}
window.addEventListener('resize', () => resizeMaps());
resizeMaps();
}
};