基于OpenLayer测量工具的Javascript类定义

mapCwgisMeasureTool.js
//定义测量工具插件功能
//mapCwgisMeasureTool.js
//vp:hsg,myk
//create date:2013-08-01
//定义回调函数
//测量距离加入一个点的时候触发事件
function handleMeasurePartial(event) {
}
//测量距离完成的时候触发事件
function handleMeasure(event) {
    var geometry = event.geometry;
    var units = event.units;   //面积或距离单位
    var order = event.order;   //命令ID
    var measure = event.measure;
    var out = "";
    if (order == 1) {
        out += "距离: " + measure.toFixed(3) + " " + mapWrap.UnitsToCHS(units);
    }
    else {
        out += "面积: " + measure.toFixed(3) + " 平方" + mapWrap.UnitsToCHS(units);
    }
    //显示测量后的结果值
    alert(out);
    //清除每次测量后的点符号
    mapWrap.map.events.clearMouseListener();
    if (order == 1) {
        measureLengthTool.onClick();
    }
    else {
        measureAreaTool.onClick();
    }
    //
}
//定义回调函数
//定义测量工具插件功能工具类 长度
mapCwgisMeasureLengthTool = OpenLayers.Class(OpenLayers.Control.Measure, mapCwgisPluginCommand,
{    
    //定义类  初始化函数
    initialize: function (p_mapCwgisClass) {
        this.init(p_mapCwgisClass);
        //   
        var handler = OpenLayers.Handler.Path;
        this.handlerOptions = handler;
        //
        //测量控制操作 
        var sketchSymbolizers = {
            "Point": {
                graphicName: "cross",
                graphicHeight: 8,
                graphicWidth: 8,
                fillColor: "#FF0000",
                fillOpacity: 1,
                strokeWidth: 0
            },
            "Line": {
                strokeWidth: 1.5,
                strokeOpacity: 1,
                strokeColor: "#0000FF"
            },
            "Polygon": {
                strokeWidth: 1.5,
                strokeOpacity: 1,
                strokeColor: "#0000FF",
                fillColor: "#ccccff",
                fillOpacity: 0.3
            }
        };

        var style = new OpenLayers.Style();
        style.addRules([new OpenLayers.Rule({ symbolizer: sketchSymbolizers })]);
        var styleMap = new OpenLayers.StyleMap({ "default": style });

        var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
        renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;

        var options = {
            persist: true,
            handlerOptions: {
                style: "default",
                layerOptions: {
                    renderers: renderer,
                    styleMap: styleMap
                }
            }
        };
        //初始化父类的构造函数
        mapCwgisPluginCommand.prototype.initialize.apply(this, [p_mapCwgisClass, handler, options]);
        OpenLayers.Control.Measure.prototype.initialize.apply(this, [handler,options]);        
        //
        this.handler = new handler(this, this.callbacks, this.handlerOptions);
        //
        this.events.on({
            "measure": handleMeasure,    //测量距离完成的时候
            "measurepartial": handleMeasurePartial   //测量距离加入一个点的时候
        });
    },
    //---------------------------------------------
    CLASS_NAME: "mapCwgisMeasureLengthTool"
});
//定义全局测量长度工具
var measureLengthTool = new mapCwgisMeasureLengthTool(mapWrap);
//向全局工具栏管理类注册
if (cmToolBar != null) {
    cmToolBar.addItem(measureLengthTool);
}
//--
//定义测量工具插件功能工具类 面积
mapCwgisMeasureAreaTool = OpenLayers.Class(OpenLayers.Control.Measure, mapCwgisPluginCommand,
{
    //定义类  初始化函数
    initialize: function (p_mapCwgisClass) {
        this.init(p_mapCwgisClass);
        //   
        var handler = OpenLayers.Handler.Polygon;
        this.handlerOptions = handler;
        //
        //测量控制操作 
        var sketchSymbolizers = {
            "Point": {
                graphicName: "cross",
                graphicHeight: 8,
                graphicWidth: 8,
                fillColor: "#FF0000",
                fillOpacity: 1,
                strokeWidth: 0
            },
            "Line": {
                strokeWidth: 1.5,
                strokeOpacity: 1,
                strokeColor: "#0000FF"
            },
            "Polygon": {
                strokeWidth: 1.5,
                strokeOpacity: 1,
                strokeColor: "#0000FF",
                fillColor: "#ccccff",
                fillOpacity: 0.3
            }
        };

        var style = new OpenLayers.Style();
        style.addRules([new OpenLayers.Rule({ symbolizer: sketchSymbolizers })]);
        var styleMap = new OpenLayers.StyleMap({ "default": style });

        var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
        renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;

        var options = {
            persist: true,
            handlerOptions: {
                style: "default",
                layerOptions: {
                    renderers: renderer,
                    styleMap: styleMap
                }
            }
        };
        //初始化父类的构造函数
        mapCwgisPluginCommand.prototype.initialize.apply(this, [p_mapCwgisClass, handler, options]);
        OpenLayers.Control.Measure.prototype.initialize.apply(this, [handler, options]);
        //
        this.handler = new handler(this, this.callbacks, this.handlerOptions);
        //
        this.events.on({
            "measure": handleMeasure,    //测量距离完成的时候
            "measurepartial": handleMeasurePartial   //测量距离加入一个点的时候
        });
    },
    //---------------------------------------------
    CLASS_NAME: "mapCwgisMeasureAreaTool"
});
//定义全局测量面积工具
var measureAreaTool = new mapCwgisMeasureAreaTool(mapWrap);
//向全局工具栏管理类注册
if (cmToolBar != null) {
    cmToolBar.addItem(measureAreaTool);
}
//--
基于OpenLayer测量工具的Javascript类定义

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