下面是我在开发过程中的技术验证demo，核心代码也是在网上找的
分享下我在应用中遇到的几个坑
1、绘制区块添加事件，添加不上，设置z-index不生效，经过查找发现 需要配置 pointer-events:visiblePainted; 属性；
2、动态加载地图底图时，会出现绘制区域坐标偏移情况，需要配置图片预加载
$(".dirdragme").on("load", function () {
$("containerDir").width($(".dirdragme").width());
$("containerDir").height($(".dirdragme").height());
svger.setAttribute("width", $(".dirdragme").width());
svger.setAttribute("height", $(".dirdragme").height());
svger.setAttribute("viewBox", "0 0 " + $(".dirdragme").width() + " " + $(".dirdragme").height());
});
下面示例demo复制即可使用；
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>获取坐标点位置，并连接点</title>
<style>
*{margin:0 ;padding:0;}
.container{800px;height:600px;position: relative; overflow: auto;}
.container{border:1px solid #ccc;cursor: pointer;position: relative;}
.dot{10px;height:10px;border-radius:50%;position:absolute;background:#0078B6;margin-top:-5px;margin-left:-5px;}
.initdot{top:0;left:0;}
svg{
position: absolute;
left: 0;
top: 0;
margin: 0 auto;
display: block;
bottom: 0;
right: 0;
}
</style>
</head>
<body >
<div style="overflow-x:scroll;overflow-y:scroll;">
<div class="container" id="container" onmousedown="whichButton(event)">
<!-- <div class="dot initdot"></div> -->
<img src="sd.jpg" id="image" class="dragme" alt="image for resizing" style="z-index: -1;position: relative;margin:0 auto;display: block;">
</div>
</div>
</body>
</html>
<script src="jquery.min.js" type="text/javascript"></script>
<script>
var arr=[];
var mark=0;
var firstSk;
var endSk;
var arrsk=[];
var points;
var container=document.getElementById("container");
var img=document.getElementById("image");
//var txt=get();
//var svgcontainer=document.getElementById("svgcontainer");
//创建svg 注：动态创建svg ie8及以下不支持该方法
var svgns="http://www.w3.org/2000/svg";
var svger=document.createElementNS(svgns,"svg");
svger.setAttribute("width",$(".dragme").width());
svger.setAttribute("height",$(".dragme").height());
svger.setAttribute("viewBox","0 0 "+$(".dragme").width()+" "+$(".dragme").height());
container.appendChild(svger);
svger.onclick=function(e){
if(mark==0)
{
var e=e||window.event;//事件对象
//获取点击地鼠标位置
var mousePosition=mousePos(e);
//新增点
creatdot(mousePosition.x,mousePosition.y);
arr.push(mousePosition.x+" "+mousePosition.y);
//points=mousePosition.x+","+mousePosition.y
//连接点
var dots=$("div[class='dot']");
if(dots.length>1)
{
points+=" "+(parseInt(mousePosition.x)-parseInt(container.offsetLeft)).toString()+","+(parseInt(mousePosition.y)-parseInt(container.offsetTop)).toString();
linedot(dots[dots.length-2],dots[dots.length-1]);
}
else{
points=(parseInt(mousePosition.x)-parseInt(container.offsetLeft)).toString()+","+(parseInt(mousePosition.y)-parseInt(container.offsetTop)).toString();
}
}
}
//位置像素 数值化
function intpixel(str){
return str.substring(0,str.length-2)*1;
}
//获取鼠标坐标
function mousePos(e){
if(e.pageX){
//IE9及以上支持pageX属性 相对文档
return {x:e.pageX,y:e.pageY}
}else{
return {x:e.clientX+document.body.scrollLeft-document.body.clientLeft,
y:e.clientY+document.body.scrollTop-document.body.clientTop}
}
}
//新增点
function creatdot(posX,posY){
//相对container坐标
var newposX=posX-container.offsetLeft;
var newposY=posY-container.offsetTop;
var dot=document.createElement("div");
dot.setAttribute("class","dot");
//定位
dot.style.left=newposX+"px";
dot.style.top=newposY+"px";
container.appendChild(dot);
}
//连接点
function linedot(dot1,dot2){
// clearTimeout(timepath);
var imgOffleft=img.offsetLeft;
var imgOffTop=img.offsetTop;
var dot1x=(parseInt(dot1.style.left)-imgOffleft).toString()+"px";
var dot1y=(parseInt(dot1.style.top)-imgOffTop).toString()+"px";
var dot2x=(parseInt(dot2.style.left)-imgOffleft).toString()+"px";
var dot2y=(parseInt(dot2.style.top)-imgOffTop).toString()+"px";
var start={x:intpixel(dot1x),y:intpixel(dot1y)};
var end={x:intpixel(dot2x),y:intpixel(dot2y)};
var current={x:start.x,y:start.y};
//创建直线
var line=document.createElementNS(svgns,"line");
line.setAttribute("x1",dot1x);
line.setAttribute("y1",dot1y);
line.setAttribute("x2",dot1x);
line.setAttribute("y2",dot1y);
line.setAttribute("stroke","red");
line.setAttribute("fill","none");
svger.appendChild(line);
//角度
var tangle={
sin:(end.y-start.y)/Math.sqrt((end.y-start.y)*(end.y-start.y)+(end.x-start.x)*(end.x-start.x)),
cos:(end.x-start.x)/Math.sqrt((end.y-start.y)*(end.y-start.y)+(end.x-start.x)*(end.x-start.x))
};
//动画
var step=function(){
//定义每帧移动位移大小为10
if(Math.abs(current.x-end.x)<10&&Math.abs(current.y-end.y)<10){
current.x=end.x;
current.y=end.y;
}else{
current.x+=10*tangle.cos;
current.y+=10*tangle.sin;
var timepath=setTimeout(step,17);//浏览器重绘速度为60帧每秒
}
line.setAttribute("x2",current.x+"px");
line.setAttribute("y2",current.y+"px");
}
step();
}
function whichButton(event) {
var btnNum = event.button;
if(btnNum==2){
mark=1;
alert(arrsk[0]+" "+arrsk[arrsk.length-1]);
// 添加多线段
var polyline= document.createElementNS(svgns, 'polyline');
polyline.setAttribute("points",points);
polyline.setAttribute("font-size", "14");
polyline.setAttribute('style', 'fill:none;stroke:red;stroke-1;pointer-events:visiblePainted;');
polyline.setAttribute('marker-end', 'url(#markerArrow)');
svger.appendChild(polyline);
$(".dot").remove();
$("line").remove();
alert(points);
points=""
mark=0;
}
// else{
// mark=0
// }
}
QA9
0.
var defs=document.createElementNS(svgns,"defs");
defs.innerHTML=`<marker id="markerArrow" markerWidth="12" markerHeight="12" refX="6" refY="6" viewBox="0 0 12 12" orient="auto" style="fill: red;"><path id="SvgjsPath1008" d="M2,2 L2,11 L10,6 L2,2" style="fill: red;"></path></marker>`;
svger.appendChild(defs);
var text=document.createElementNS(svgns,"text");
text.setAttribute("x","151");
text.setAttribute("y","436");
text.setAttribute("fill","red");
text.setAttribute("sitekey","P00001");
//text.setAttribute("onclick","click('P00001')");
//text.html("sdfsdfsdff");
text.addEventListener("click", function() {
firstSk=$(this).attr("sitekey");
arrsk.push($(this).attr("sitekey"));
});
// text.addEventListener("mouseover", function() {
// alert($(this).attr("sitekey"));
// });
text.innerHTML = "fsdfsdf";
svger.appendChild(text);
// 添加文本
var t = document.createElementNS(svgns, 'text');
t.setAttribute("x",400);
t.setAttribute("y", 300);
t.setAttribute("font-size", "14");
t.setAttribute('fill', 'blue');
t.setAttribute('sitekey', 'P00002');
t.setAttribute('style',"pointer-events:visiblePainted;");
t.addEventListener("click", function() {
endSk=$(this).attr("sitekey");
arrsk.push($(this).attr("sitekey"));
});
// t.addEventListener("mouseover", function() {
// alert($(this).attr("sitekey"));
// });
t.innerHTML = "fsfsdfsfdsdfffffffffff";
svger.appendChild(t);
// 添加多边形
var polygon = document.createElementNS(svgns, 'polygon');
polygon.setAttribute("points","380,238 520,251 600,312 320,365");
polygon.setAttribute('sitekey', 'P00003');
polygon.setAttribute('style',"fill:transparent;stroke:purple;stroke-1;pointer-events:visiblePainted;");
polygon.addEventListener("click", function() {
endSk=$(this).attr("sitekey");
arrsk.push($(this).attr("sitekey"));
});
svger.appendChild(polygon);
// 添加多线段
var polyline= document.createElementNS(svgns, 'polyline');
polyline.setAttribute("points","241,138 575,151 736,212 671,365 622,448 358,451 356,315");
polyline.setAttribute("font-size", "14");
polyline.setAttribute('style', 'fill:none;stroke:red;stroke-1;pointer-events:visiblePainted;');
polyline.setAttribute('marker-end', 'url(#markerArrow)');
svger.appendChild(polyline);
// $(function() {
// $("text").click(function(){
// alert("sfdsfdsf");
// });
// });
// function click(param){
// alert(param);
// }
// window.addEventListener('mouseup', (e) => {
// // Let's pick a random color between #000000 and #FFFFFF
// const color = Math.round(Math.random() * 0xFFFFFF)
// // Let's format the color to fit CSS requirements
// const fill = '#' + color.toString(16).padStart(6,'0')
// // Let's apply our color in the
// // element we actually clicked on
// e.target.style.fill = fill
// })
// var draw = SVG('container');
// var arrow = draw.marker(12, 12, function (add) {
// add.path();
// // add.circle(10).fill('#f06')
// add.style({
// fill: 'red'
// });
// });
// var line2 = draw.polyline('241,138 575,151 736,212 671,365 622,448 358,451 356,315');
// line2.fill('none').style({
// stroke: 'red',
// 'stroke-width': 1
// });
// line2.marker('end', arrow)
// $("path").attr("d","M2,2 L2,11 L10,6 L2,2");
// $("path").attr("style","fill: red;");
</script>