OL3矢量图层样式自定义

牛老师讲GIS

发布于 2018-10-23 03:24:30

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代码可运行

文章被收录于专栏：跟牛老师一起学WEBGIS跟牛老师一起学WEBGIS

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代码可运行

概述：

本文讲述如何在OL3中加载Geojson并动态修改图层样式。

效果：

地图展示

样式修改面板

实现代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>Ol3 wms</title>
	<link rel="stylesheet" type="text/css" href="../../../plugin/ol3/css/ol.css"/>
	<style type="text/css">
		body, #map {
			border: 0px;
			margin: 0px;
			padding: 0px;
			width: 100%;
			height: 100%;
			font-size: 13px;
		}
		.style-box{
			position: absolute;
			top: 10px;
			right: 10px;
			z-index: 999;
			background: #ffffff;
			border: 1px solid #cccccc;
			box-shadow: 2px 2px 3px #C0C0C0;
			padding: 10px;
			border-radius: 4px;
		}
		.style-box ul{
			margin: 0px;
		}
		.style-box ul li{
			list-style: none;
			margin: 0px;
			margin-left: -40px;
		}
		.style-box ul li h5{
			margin: 6px 0px;
		}
	</style>
	<script type="text/javascript" src="../../../plugin/ol3/build/ol-debug.js"></script>
	<script type="text/javascript" src="../../../plugin/jquery/jquery-1.8.3.js"></script>
	<script type="text/javascript" src="extends/color_exchange.js"></script>
	<script type="text/javascript">
		function init(){
			var bounds = [73.4510046356223, 18.1632471876417,
				134.976797646506, 53.5319431522236];
			var projection = new ol.proj.Projection({
				code: 'EPSG:4326',
				units: 'degrees'
			});
			$.get("data/province.geojson",null,function(result){
				var features = (new ol.format.GeoJSON()).readFeatures(result);
				var vectorSource = new ol.source.Vector();
				vectorSource.addFeatures(features);
				var vector = new ol.layer.Vector({
					source: vectorSource,
					style:getStyle("blue", "true", 2)
				});
				var map = new ol.Map({
					controls: ol.control.defaults({
						attribution: false
					}),
					target: 'map',
					layers: [vector],
					view: new ol.View({
						projection: projection
					})
				});
				map.getView().fit(bounds, map.getSize());
				//线的颜色
				$("input[name='linecolor']").on("change",function(){
                    var _color = $(this).val();
				    if(_color===""){
                        $("#linecolor").show();
					}
					else{
                        $("#linecolor").attr("value", _color).hide();
					}
                    vector.setStyle(getStyle());
				});
                //填充颜色
                $("input[name='fillcolor']").on("change",function(){
                    var _color = $(this).val();
                    if(_color===""){
                        $("#fillcolor").show();
                    }
                    else{
                        $("#fillcolor").attr("value", _color).hide();
                    }
                    vector.setStyle(getStyle());
                });
				//透明度，线的颜色，填充颜色，线条类型，线条宽度
                $("input[name='linetype'], input[name='linewidth'], #islabel").on("change",function(){
                    vector.setStyle(getStyle());
                });
                $("#opacity, #linecolor, #fillcolor").on("input propertychange",function(){
                    vector.setStyle(getStyle());
                });
			});
		}

		function getStyle() {
            var color = $("input[name='linecolor']:checked").val();
            var fillColor = $("#fillcolor").val();
            var opacity = $("#opacity").val();
            if(color===""){
                color = $("#linecolor").val();
            }
            fillColor = fillColor.colorRgb();
            var _fillColor = "RGBA("+fillColor[0]+","+fillColor[1]+","+fillColor[2]+","+opacity+")";
            var dash = $("input[name='linetype']:checked").val();
            var width = parseInt($("input[name='linewidth']").val());
		    var _dash = dash==="true"?3*width:0;
		    var islabel = $("#islabel")[0].checked;
            return function(feature, resolution){
                var name = feature.get("name");
                var lblcolor = '#000000';
                if(!islabel)lblcolor = 'rgba(0,0,0,0)';
                return new ol.style.Style({
                    stroke: new ol.style.Stroke({
                        color: color,
                        lineDash: [_dash, _dash],
                        width: width
                    }),
                    fill: new ol.style.Fill({
                        color: _fillColor,
                        opacity:opacity
                    }),
                    text: new ol.style.Text({
                        text: name,
                        fill: new ol.style.Fill({
                            color:lblcolor
                        })
                    })
                });
			}
        }
	</script>
</head>
<body onLoad="init()">
<div id="map">
	<div class="style-box">
		<ul>
			<li>
				<h5>
					<input type="checkbox" name="islabel" id="islabel">显示标注
				</h5>
			</li>
			<li>
				<h5>填充颜色：</h5>
				<input type="radio" name="fillcolor" value="#000000">黑色
				<input type="radio" name="fillcolor" value="#0000ff" checked="checked">蓝色
				<input type="radio" name="fillcolor" value="#ff0000">红色
				<input type="radio" name="fillcolor" value="">自定义
				<input type="color" id="fillcolor" value="#0000ff" style="display: none;"/>
			</li>
			<li>
				<h5>填充透明度：</h5>
				<input type="number" id="opacity" value="0.3" min="0" max="1" step="0.1" style="width: 100%;">
			</li>
			<li>
				<h5>线条颜色：</h5>
				<input type="radio" name="linecolor" value="#000000">黑色
				<input type="radio" name="linecolor" value="#0000ff" checked="checked">蓝色
				<input type="radio" name="linecolor" value="#ff0000">红色
				<input type="radio" name="linecolor" value="">自定义
				<input type="color" id="linecolor" value="#0000ff" style="display: none;"/>
			</li>
			<li>
				<h5>线条类型：</h5>
				<input type="radio" name="linetype" value="false">实线
				<input type="radio" name="linetype" value="true" checked="checked">虚线
			</li>
			<li>
				<h5>线条宽度：</h5>
				<input type="number" name="linewidth" value="2" min="1" max="5" style="width: 100%;">
			</li>
		</ul>
	</div>
</div>
</body>
</html>