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【百度地图API】你看过房产地图吗?你知道房产标注是如何建立的吗?

原文:【百度地图API】你看过房产地图吗?你知道房产标注是如何建立的吗?

你是不是看过很多房产网站?例如安居客,新浪乐居。
你是不是也想做一个能写文字的标注?
你知道怎么去实现麼?
技术分享
其实,上图这样的标注是一个“自定义覆盖物”。你可以任意指定它的样式,文字,图片等等。
首先,我需要初始化地图:
var mp = new BMap.Map("map_container");
var point = new BMap.Point(116.3964,39.9093);
mp.centerAndZoom(point,
15);
然后,我建立两个自定义覆盖物:
var myCompOverlay = new ComplexCustomOverlay(new BMap.Point(116.407845,39.914101), "天安门东");
var myCompOverlay2 = new ComplexCustomOverlay(new BMap.Point(116.406946,39.911403), "国家博物馆");
对自定义覆盖物定义:(包括样式、图片、位置偏移等等)
// 复杂的自定义覆盖物
function ComplexCustomOverlay(point, text){
this._point = point;
this._text = text;
}
ComplexCustomOverlay.prototype
= new BMap.Overlay();
ComplexCustomOverlay.prototype.initialize
= function(map){
this._map = map;
var div = this._div = document.createElement("div");
div.style.position
= "absolute";
div.style.zIndex
= BMap.Overlay.getZIndex(this._point.lat);
div.style.backgroundColor
= "#EE5D5B";
div.style.border
= "1px solid #BC3B3A";
div.style.color
= "white";
div.style.height
= "18px";
div.style.padding
= "2px";
div.style.lineHeight
= "18px";
div.style.whiteSpace
= "nowrap";
div.style.MozUserSelect
= "none";
div.style.fontSize
= "12px"
div.appendChild(document.createTextNode(
this._text));


var arrow = this._arrow = document.createElement("div");
arrow.style.background
= "url(http://map.baidu.com/fwmap/upload/r/map/fwmap/static/house/images/label.png) no-repeat";
arrow.style.position
= "absolute";
arrow.style.width
= "11px";
arrow.style.height
= "10px";
arrow.style.top
= "22px";
arrow.style.left
= "10px";
arrow.style.overflow
= "hidden";
div.appendChild(arrow);

div.onmouseover
= function(){
this.style.backgroundColor = "#6BADCA";
this.style.borderColor = "#0000ff";
arrow.style.backgroundPosition
= "0px -20px";
}

div.onmouseout
= function(){
this.style.backgroundColor = "#EE5D5B";
this.style.borderColor = "#BC3B3A";
arrow.style.backgroundPosition
= "0px 0px";
}

mp.getPanes().labelPane.appendChild(div);

return div;
}
ComplexCustomOverlay.prototype.draw
= function(){
var map = this._map;
var pixel = map.pointToOverlayPixel(this._point);
this._div.style.left = pixel.x - parseInt(this._arrow.style.left) + "px";
this._div.style.top = pixel.y - 30 + "px";
}
最后,在地图上把它们添加上来。
mp.addOverlay(myCompOverlay);
mp.addOverlay(myCompOverlay2);
运行示例,请点击:
http://ui-love.com/baidumap/customoverlay.html

【百度地图API】你看过房产地图吗?你知道房产标注是如何建立的吗?