arcgis api for js入门开发系列五地图态势标绘

by · 2018-10-25

地图态势标绘

上一篇实现了demo的地图查询功能，本篇新增地图态势标绘模块，截图如下：

本篇核心的在于调用API的Draw工具：https://developers.arcgis.com/javascript/3/jsapi/draw-amd.html

require(["esri/toolbars/draw"], function(Draw) { /* code goes here */ });

构造函数：

new Draw(map, options?)

一般来说，传参map对象进来就行，其他参数可选的，用默认的就行，除非你想专门设置；

默认的可绘制图形类型常量Constants：

ARROW    Draws an arrow.箭头
CIRCLE    Draws a circle.圆形
DOWN_ARROW    Draws an arrow that points down.下箭头
ELLIPSE    Draws an ellipse.椭圆
EXTENT    Draws an extent box.矩形
FREEHAND_POLYGON    Draws a freehand polygon.手绘多边形
FREEHAND_POLYLINE    Draws a freehand polyline.手绘线
LEFT_ARROW    Draws an arrow that points left.左箭头
LINE    Draws a line.线
MULTI_POINT    Draws a Multipoint.多点
POINT    Draws a point.点
POLYGON    Draws a polygon.多边形
POLYLINE    Draws a polyline.折线
RECTANGLE    Draws a rectangle.矩形
RIGHT_ARROW    Draws an arrow that points right.右键头
TRIANGLE    Draws a triangle.三角形
UP_ARROW    Draws an arrow that points up.上箭头

可以设置绘制的符号样式：

其中，activate函数可以激活触发绘制的行为，绘制结束之后在绘制结束事件里面获取geometry：

activate(geometryType, options?)

地图态势标绘实现的思路：利用API的Draw工具实现普通的点线面绘制，但是对于燕尾箭头、集结地、弧线、曲线、简单箭头等特殊的军事态势需要自定义来绘制了，所以需要拓展Draw工具才能实现，也是本篇的精华所在。

一、下面谈谈怎么在项目引用拓展Draw类js文件：

1是继承拓展Draw的文件目录；2是实现态势标绘模块的js文件。

首先，需要在map.html页面引用进来：

<script type="text/javascript">
        //配置arcgis拓展解析天地图服务类引用的路径
        dojoConfig = {
            parseOnLoad: true,
            packages: [{
                name: 'tdlib',
                location: this.location.pathname.replace(/\/[^/]+$/, "") + "/js/tdlib"
            }],
            paths: {
                Extension: location.pathname.replace(/\/[^/]+$/, "") + "/js/main/drawExtension/Extension",
                ExtensionDraw: location.pathname.replace(/\/[^/]+$/, "") + "/js/main/drawExtension/plotDraw"
            }
        };
    </script>

其中，paths代表需要引用的路径。

<script type="text/javascript" src="js/main/map.plot.js"></script>

其次，在map.js文件的初始化里面引用拓展的js文件DrawEx以及DrawExt：

(function () {
    dojo.require("Extension.DrawEx");
    dojo.require("ExtensionDraw.DrawExt");
})();

最后，在工具栏菜单的态势标绘菜单响应事件里面调用plot.js即可:

//态势标绘
        $("#bPlot").click(function () {
            //初始化军势标绘接口
            if (!DCI.Plot.isload)
                DCI.Plot.Init(map);
            if (DCI.Plot.dialog)
                DCI.Plot.dialog.close();
            DCI.Plot.dialog = jDialog.dialog({
                title: '态势标绘',
                width: 370,
                height: 200,
                left: 450,
                top: 200,
                modal: false, // 非模态，即不显示遮罩层
                content: DCI.Plot.Html
            });
            DCI.Plot.InitEvent();

        });

二、谈谈Draw工具调用的思路，不管调用arcgis api原生态的Draw，还是拓展Draw的，都是先创建一个Draw对象，然后监听Draw的draw-end绘制结束的回调函数，获取绘制的图形叠加在地图显示；Draw工具的activate函数会触发draw-end回调函数；

首先，初始化Draw工具对象以及默认的符号样式symbol：

//定义默认点 线  面符号
DCI.Plot.markerSymbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_CIRCLE, 8, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255, 69, 0]), 2), new dojo.Color([255, 255, 255, 1]));
            DCI.Plot.lineSymbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255, 160, 122]), 2);
            DCI.Plot.fillSymbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255, 160, 122]), 2), new dojo.Color([255, 255, 255, 0.5]));
            //初始化拓展Draw
            DCI.Plot.toolbar = new Extension.DrawEx(map);
            DCI.Plot.toolbar.on("draw-end", DCI.Plot.addToMap);
            DCI.Plot.toolbar1 = new ExtensionDraw.DrawExt(map);
            DCI.Plot.toolbar1.on("draw-end", DCI.Plot.addToMap);
            //arcgis api自带的Draw
            DCI.Plot.drawToolbar = new esri.toolbars.Draw(map);
            DCI.Plot.drawToolbar.markerSymbol = DCI.Plot.markerSymbol;
            DCI.Plot.drawToolbar.lineSymbol = DCI.Plot.lineSymbol;
            DCI.Plot.drawToolbar.fillSymbol = DCI.Plot.fillSymbol;
            DCI.Plot.drawToolbar.on("draw-end", DCI.Plot.drawEnd);

其次，触发调用Draw绘制：

case 0://plot_freehandline
                        DCI.Plot.drawFreeHandPolyline(null, function (geometry) {
                            symbol = DCI.Plot.lineSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 1://plot_line
                        DCI.Plot.drawPolyline(null, function (geometry) {
                            symbol = DCI.Plot.lineSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 2://emergency_freehand
                        DCI.Plot.drawFreeHandPolygon(null, function (geometry) {
                            symbol = DCI.Plot.fillSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 3://plot_polygon
                        DCI.Plot.drawPolygon(null, function (geometry) {
                            symbol = DCI.Plot.fillSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 4://plot_extent
                        DCI.Plot.drawExtent(null, function (geometry) {
                            symbol = DCI.Plot.fillSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 5://emergency_freehand
                        DCI.Plot.drawCircle(null, function (geometry) {
                            symbol = DCI.Plot.fillSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 6://直角箭头
                        DCI.Plot.drawStraightArrow(null, function (geometry) {
                            symbol = DCI.Plot.fillSymbol;
                            DCI.Plot.drawEndPlot(geometry, symbol);
                        });
                        break;
                    case 7://简单箭头
                        DCI.Plot.toolbar.activate(Extension.DrawEx.FREEHAND_ARROW);
                      break; 
                    case 8://燕尾箭头
                        DCI.Plot.toolbar1.fillSymbol = DCI.Plot.fillSymbol;
                        DCI.Plot.toolbar1.activate("tailedsquadcombat");
                        break;  
                    case 9://集结地
                        DCI.Plot.toolbar.activate(Extension.DrawEx.BEZIER_POLYGON);
                      break; 
                    case 10://弧线
                        DCI.Plot.toolbar.activate(Extension.DrawEx.CURVE);
                      break;  
                    case 11://曲线
                        DCI.Plot.toolbar.activate(Extension.DrawEx.BEZIER_CURVE);
                      break;
//画点
        drawPoint: function (symbol, onDrawEnd) {
            DCI.Plot.onDrawEnd = onDrawEnd;
            if (symbol) {
                DCI.Plot.drawToolbar.markerSymbol = symbol;
            }
            DCI.Plot.drawToolbar.activate(esri.toolbars.Draw.POINT);
            DCI.Plot.disablePan();
        },
        //画折线
        drawPolyline: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.lineSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.POLYLINE);
            this.disablePan();
        },
        //自由线
        drawFreeHandPolyline: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.lineSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.FREEHAND_POLYLINE);
            this.disablePan();
        },
        //画多边形
        drawPolygon: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.fillSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.POLYGON);
            this.disablePan();
        },
        //手绘多边形
        drawFreeHandPolygon: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.fillSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.FREEHAND_POLYGON);
            this.disablePan();
        },
        //画圆形
        drawCircle: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.fillSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.CIRCLE);
            this.disablePan();
        },
        //画矩形
        drawExtent: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.fillSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.EXTENT);
            this.disablePan();
        },
        //直角箭头
        drawStraightArrow: function (symbol, onDrawEnd) {
            this.onDrawEnd = onDrawEnd;
            if (symbol) {
                this.drawToolbar.fillSymbol = symbol;
            }
            this.drawToolbar.activate(esri.toolbars.Draw.ARROW);
            this.disablePan();
        },

最后，添加绘制图形在地图上展示：

/**
         * 绘制完毕调用的函数
        */
        drawEndPlot: function (geometry,symbol) {
            var title = "标题";
            var htmlCon = "测试内容测试内容";
            var attr = { "title": title, "content": htmlCon};
            var graphic = new esri.Graphic(geometry, symbol, attr);
            DCI.Plot.graphicslayer.add(graphic);
            DCI.Plot.deactivateDraw();
            DCI.Plot.map.setMapCursor('auto');//设置鼠标的光标          
        },
/**
  * 拓展Draw绘制完毕调用的函数
*/
        addToMap: function (evt) {
            DCI.Plot.map.setMapCursor('auto');//设置鼠标的光标      
            var symbol;
            DCI.Plot.toolbar.deactivate();
            DCI.Plot.toolbar1.deactivate();
            switch (evt.geometry.type)
            {
                case "point":
                case "multipoint":
                    symbol = DCI.Plot.markerSymbol;
                    break;
                case "polyline":
                    symbol = DCI.Plot.lineSymbol;
                    break;
                default:
                    symbol = DCI.Plot.fillSymbol;
                    break;
            }
            var title = "标题";
            var htmlCon = "测试内容测试内容";
            var attr = { "title": title, "content": htmlCon};
            var graphic = new esri.Graphic(evt.geometry, symbol, attr);
            DCI.Plot.graphicslayer.add(graphic);
        },

 

arcgis api for js3.x入门开发系列列表

  1. arcgis api离线部署
  2. 不同地图服务展示
  3. 地图工具栏
  4. 地图查询
  5. 地图态势标绘
  6. 地图分屏对比
  7. 图层控制
  8. 聚合效果
  9. 热力图效果
  10. 叠加SHP图层
  11. 地图统计图
  12. 地图打印（GP服务）
  13. 地图最短路径分析
  14. 最近设施点路径分析
  15. 台风轨迹
  16. 迁徙流动图
  17. 在线地图（天地图、百度地图、高德地图）
  18. 风向流动图
  19. 图层在线编辑
  20. 打印地图的那些事
  21. 气泡窗口信息动态配置模板

干货：

  1. 自写算法实现地图量算工具
  2. 自定义Navigation控件样式风格
  3. 热力图优化篇-不依赖地图服务
  4. 实现克里金插值渲染图–不依赖GP服务
  5. echarts开源js库实现地图统计图分析

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