leaflet 繪制點線面圓橢圓線緩沖區-有解無憂

leaflet有個繪圖插件Leaflet.draw，但是我不想要它的控制元件，只想用它的繪制功能，控制元件我自己提供，當時不知道如何使用，就自己寫了個繪制點線面圓和橢圓的工具，代碼如下：

/// <reference path="define.js" />
/// <reference path="icon.js" />
/// <reference path="map.js" />
/// <reference path="../dist/l.ellipse.js" />
/// <reference path="../dist/turf.js" />
/// <reference path="../libs/layer/layer.js" />

/**
 * 繪圖
 */

var drawUtil = (function () {

    //圖層
    var _drawLayer;

    //繪圖型別 1：多邊形 2：畫線 3：畫矩形 4：畫橢圓 5選擇位置 6畫圓
    var _drawType;

    //是否允許mousemove事件
    var _allowMouseMove = true;

    //多邊形點集合
    var _polygonPointArr = [];

    //多邊形
    var _polygon;

    //線的點集合
    var _polylinePointArr = [];

    //線
    var _polyline;

    //線克隆
    var _polylineClone; //防止繪圖結束線被清空不能繪制線緩沖區

    //畫矩形時mousedown點擊的那個點
    var _rectangleInitPoint;

    //矩形點集合
    var _rectanglePointArr = [];

    //矩形
    var _rectangle;

    //畫橢圓時mousedown點擊的那個點
    var _ellipseInitPoint;

    //橢圓點集合
    var _ellipsePointArr = [];

    //橢圓
    var _ellipse;

    //畫圓時mousedown點擊的那個點
    var _circleInitPoint;

    //圓點集合
    var _circlePointArr = [];

    //圓
    var _circle;

    //線緩沖區點集合
    var _polylineBufferPointArr = [];

    //緩沖區
    var _polylineBuffer;

    //位置marker
    var _locationMarker;

    //地圖層級改變
    var _mapZoomChanged = false;

    //是否移動了地圖
    var _isMapMoved = false;

    //是否按下滑鼠
    var _isMouseDown = false;

    //結束繪圖回呼
    var _endDrawCallback;

    //地圖中心
    var _mapCenter;

    //線條顏色
    var _strokeColr = "#f84400";

    //填充顏色
    var _fillColor = "#f84400";

    //用于繪圖的div層
    var _drawPane;

    //用于繪圖的div層
    var _drawPaneBelow;

    /**
    * 開始繪圖
    * @param [int] type 繪圖型別 1：多邊形 2：畫線 3：畫矩形 4：畫橢圓 5選擇位置 6畫圓
    */
    var _startDraw = function (type) {
        _stopDraw();
        _drawType = type;

        _mapCenter = map.getCenter();

        map.addEventListener("mousedown", _mousedown);
        map.addEventListener("mousemove", _mousemove);
        map.addEventListener("mouseup", _mouseup);
        map.addEventListener("dblclick", _dblclick);
        map.addEventListener("zoom", _zoom);
        map.addEventListener("movestart", _movestart);
        map.addEventListener("moveend", _moveend);
        map.addEventListener("move", _move);
    };

    //結束繪圖
    var _endDraw = function (e) {
        if (_drawType == 3 || _drawType == 4 || _drawType == 6) { //結束畫矩形、橢圓
            map.dragging.enable();
        }

        if (_drawType == 2) { //畫線
            if (jsObjExists()) jsObj.DrawEnd(_drawType);
        }

        _polylineClone = _polyline;

        if (_drawType == 1 && _endDrawCallback) _endDrawCallback(_polygon);
        if (_drawType == 2 && _endDrawCallback) _endDrawCallback(_polyline);
        if (_drawType == 3 && _endDrawCallback) _endDrawCallback(_rectangle);
        if (_drawType == 4 && _endDrawCallback) _endDrawCallback(_ellipsePointArr);
        if (_drawType == 6 && _endDrawCallback) _endDrawCallback(_circlePointArr);

        _polygonPointArr = [];
        _polygon = undefined;

        _polylinePointArr = [];
        _polyline = undefined;

        _rectanglePointArr = [];
        _rectangleInitPoint = undefined;
        _rectangle = undefined;

        _ellipsePointArr = [];
        _ellipseInitPoint = undefined;
        _ellipse = undefined;

        _circlePointArr = [];
        _circleInitPoint = undefined;
        _circle = undefined;

        _polylineBufferPointArr = [];
        _polylineBuffer = undefined;
    }

    //結束繪圖回呼
    var _registerEndDrawCallback = function (fun) {
        _endDrawCallback = fun;
    }

    //map mousedown
    var _mousedown = function (e) {
        if (!_drawType) return;

        _allowMouseMove = false;

        _isMouseDown = true;

        _mapCenter = map.getCenter();

        if (_drawType == 3 || _drawType == 4 || _drawType == 6) { //畫矩形和橢圓時不能移動地圖
            map.dragging.disable();
            _allowMouseMove = true;

            if (e.originalEvent.button == 0) { //左鍵
                if (_drawType == 3 || _drawType == 4 || _drawType == 6) {
                    _mousedownDraw(e);
                }
            }
        }
    }

    //map mousemove
    var _mousemove = function (e) {
        if (!_drawType) return;

        if (_allowMouseMove) {
            setTimeout(function () {
                _realTimeDraw(e);  //實時繪圖
            }, 1);
        }
    }

    //map mouseup
    var _mouseup = function (e) {
        if (!_drawType) return;

        _isMouseDown = false;

        if (e.originalEvent.button == 2) { //右鍵
            _endDraw(e); //結束繪圖
        }

        if (e.originalEvent.button == 0) { //左鍵
            _mapZoomChanged = false;

            var center = map.getCenter();
            if (_drawType == 1 || _drawType == 2) {
                if (_mapCenter.lng == center.lng && _mapCenter.lat == center.lat) {
                    _mouseupDraw(e);
                }
            }

            if (_drawType == 3 || _drawType == 4 || _drawType == 6) {
                _endDraw(e); //結束繪圖
            }

            if (_drawType == 5) {
                if (_mapCenter.lng == center.lng && _mapCenter.lat == center.lat) {
                    _mouseupDraw(e);
                    if (_endDrawCallback) _endDrawCallback(e.latlng.lat, e.latlng.lng);
                }
            }
        }

        setTimeout(function () {
            _allowMouseMove = true;
        }, 100);
    }

    //map dblclick
    var _dblclick = function (e) {
        if (!_drawType) return;

        setTimeout(function () {
            _endDraw(undefined);
        }, 1);
    }

    //map zoom
    var _zoom = function (e) {
        if (!_drawType) return;

        _mapZoomChanged = true;
    }

    //map movestart
    var _movestart = function (e) {
        if (!_drawType) return;

        _isMapMoved = true;
    }

    //map moveend
    var _moveend = function (e) {
        if (!_drawType) return;

        _isMapMoved = false;
    }

    //map move
    var _move = function (e) {
        if (!_drawType) return;
    }

    //實時繪圖
    var _realTimeDraw = function (e) {
        //實時畫多邊形
        if (_drawType == 1 && _polygonPointArr.length > 0) {
            if (_polygon != null) {
                _drawLayer.removeLayer(_polygon);
            }

            if (_polygonPointArr.length > 1) _polygonPointArr.pop();
            var point = [e.latlng.lat, e.latlng.lng];
            _polygonPointArr.push(point);
            _polygon = L.polygon(_polygonPointArr, { stroke: true, color: _strokeColr, weight: 2, fill: true, fillColor: _fillColor, fillOpacity: 0.5, pane: _drawPaneBelow });

            _drawLayer.addLayer(_polygon);
        }

        //實時畫線
        if (_drawType == 2 && _polylinePointArr.length > 0) {
            if (_polyline != null) {
                _drawLayer.removeLayer(_polyline);
            }

            if (_polylinePointArr.length > 1) _polylinePointArr.pop();
            var point = [e.latlng.lat, e.latlng.lng];
            _polylinePointArr.push(point);
            _polyline = L.polyline(_polylinePointArr, { stroke: true, color: _strokeColr, weight: 2, pane: _drawPane });

            _drawLayer.addLayer(_polyline);
        }

        //實時畫矩形
        if (_drawType == 3 && _rectangleInitPoint) {
            if (_rectangle != null) {
                _drawLayer.removeLayer(_rectangle);
            }

            if (_rectanglePointArr.length > 1) _rectanglePointArr.pop();
            var point = [e.latlng.lat, e.latlng.lng];
            _rectanglePointArr.push(point);
            _rectangle = L.rectangle(_rectanglePointArr, { stroke: true, color: _strokeColr, weight: 2, fill: true, fillColor: _fillColor, pane: _drawPaneBelow });

            _drawLayer.addLayer(_rectangle);
        }

        //實時畫橢圓
        if (_drawType == 4 && _ellipseInitPoint) {
            if (_ellipse != null) {
                _drawLayer.removeLayer(_ellipse);
            }

            var point = [e.latlng.lat, e.latlng.lng];

            if (_ellipsePointArr.length > 1) _ellipsePointArr.pop();
            _ellipsePointArr[0][0] = _ellipseInitPoint[0] + (point[0] - _ellipseInitPoint[0]) / 2.0;
            _ellipsePointArr[0][1] = _ellipseInitPoint[1] + (point[1] - _ellipseInitPoint[1]) / 2.0;

            var from = turf.point([_ellipsePointArr[0][1], _ellipsePointArr[0][0]]);
            var to1 = turf.point([point[1], _ellipsePointArr[0][0]]);
            var to2 = turf.point([_ellipsePointArr[0][1], point[0]]);
            var options = { units: 'meters' };

            var distance1 = turf.distance(from, to1, options);
            var distance2 = turf.distance(from, to2, options);
            var radius = [distance2, distance1];

            _ellipsePointArr.push(point);
            _ellipse = L.ellipse(_ellipsePointArr[0], radius, 90, { stroke: true, weight: 2, color: _strokeColr, fill: true, fillColor: _fillColor, pane: _drawPaneBelow });

            _drawLayer.addLayer(_ellipse);
        }

        //實時畫圓
        if (_drawType == 6 && _circleInitPoint) {
            if (_circle != null) {
                _drawLayer.removeLayer(_circle);
            }

            var point = [e.latlng.lat, e.latlng.lng];

            if (_circlePointArr.length > 1) _circlePointArr.pop();

            var d = Math.pow(Math.pow(point[0] - _circleInitPoint[0], 2) + Math.pow(point[1] - _circleInitPoint[1], 2), 0.5);
            point[0] = _circleInitPoint[0] - d;
            point[1] = _circleInitPoint[1] + d;

            var from = turf.point([_circlePointArr[0][1], _circlePointArr[0][0]]);
            var to1 = turf.point([point[1], _circlePointArr[0][0]]);
            var to2 = turf.point([_circlePointArr[0][1], point[0]]);
            var options = { units: 'meters' };

            var distance1 = turf.distance(from, to1, options);
            var distance2 = turf.distance(from, to2, options);
            var radius = [distance2, distance1];

            _circlePointArr.push(point);
            _circle = L.ellipse(_circlePointArr[0], radius, 90, { stroke: true, weight: 2, color: _strokeColr, fill: true, fillColor: _fillColor, pane: _drawPaneBelow });

            _drawLayer.addLayer(_circle);
        }
    }

    //停止繪圖
    var _stopDraw = function () {
        map.removeEventListener("mousedown", _mousedown);
        map.removeEventListener("mousemove", _mousemove);
        map.removeEventListener("mouseup", _mouseup);
        map.removeEventListener("dblclick", _dblclick);
        map.removeEventListener("zoom", _zoom);
        map.removeEventListener("movestart", _movestart);
        map.removeEventListener("moveend", _moveend);
        map.removeEventListener("move", _move);

        _polygonPointArr = [];
        _polygon = undefined;

        _polylinePointArr = [];
        _polyline = undefined;

        _rectanglePointArr = [];
        _rectangleInitPoint = undefined;
        _rectangle = undefined;

        _ellipsePointArr = [];
        _ellipseInitPoint = undefined;
        _ellipse = undefined;

        _circlePointArr = [];
        _circleInitPoint = undefined;
        _circle = undefined;

        _polylineBufferPointArr = [];
        _polylineBuffer = undefined;

        map.dragging.enable();

        isPointSelect = false; //清除點選

        _drawType = undefined; //清除繪圖
    };

    //清慷訓圖
    var _clearDraw = function () {
        _drawLayer.clearLayers();
        _locationMarker = null;
    };

    //點擊繪圖
    var _mousedownDraw = function (e) {
        setTimeout(function () { //使用setTimeout map的dblclick才會觸發
            //畫矩形
            if (_drawType == 3) {
                if (_rectangle != null) {
                    _drawLayer.removeLayer(_rectangle);
                }

                _rectangleInitPoint = [e.latlng.lat, e.latlng.lng];
                _rectanglePointArr.push([e.latlng.lat, e.latlng.lng]);
            }

            //畫橢圓
            if (_drawType == 4) {
                if (_ellipse != null) {
                    _drawLayer.removeLayer(_ellipse);
                }

                _ellipseInitPoint = [e.latlng.lat, e.latlng.lng];
                _ellipsePointArr.push([e.latlng.lat, e.latlng.lng]);
            }

            //畫圓
            if (_drawType == 6) {
                if (_circle != null) {
                    _drawLayer.removeLayer(_circle);
                }

                _circleInitPoint = [e.latlng.lat, e.latlng.lng];
                _circlePointArr.push([e.latlng.lat, e.latlng.lng]);
            }
        }, 1);
    }

    //點擊繪圖
    var _mouseupDraw = function (e) {
        setTimeout(function () { //使用setTimeout map的dblclick才會觸發
            //畫多邊形
            if (_drawType == 1) {
                if (_polygon != null) {
                    _drawLayer.removeLayer(_polygon);
                }

                var point = [e.latlng.lat, e.latlng.lng];
                _polygonPointArr.push(point);
                _polygon = L.polygon(_polygonPointArr, { stroke: true, color: _strokeColr, weight: 2, fill: true, fillColor: _fillColor, fillOpacity: 0.5, pane: _drawPaneBelow });

                _drawLayer.addLayer(_polygon);
            }

            //畫線
            if (_drawType == 2) {
                if (_polyline != null) {
                    _drawLayer.removeLayer(_polyline);
                }

                var point = [e.latlng.lat, e.latlng.lng];
                _polylinePointArr.push(point);
                _polyline = L.polyline(_polylinePointArr, { stroke: true, color: _strokeColr, weight: 2, pane: _drawPane });

                _drawLayer.addLayer(_polyline);
            }

            //選擇位置
            if (_drawType == 5) {
                if (_locationMarker != null) {
                    _drawLayer.removeLayer(_locationMarker);
                }

                var latlng = new L.LatLng(rectifyLat(e.latlng.lat), rectifyLng(e.latlng.lng));
                _locationMarker = new L.Marker(latlng, {});
                _locationMarker.setIcon(iconPrision);
                _drawLayer.addLayer(_locationMarker);
            }
        }, 1);
    }

    //map的moveend事件中繪圖
    var _moveendDraw = function (e) {
        if (!_drawType) return;
    }

    //顯示緩沖區
    var _showBuffer = function showBuffer(polyline, bufferValue) {
        var pointArr = [];
        var latlngs = polyline.getLatLngs();
        for (var i = 0; i < latlngs.length; i++) {
            pointArr.push([latlngs[i].lng, latlngs[i].lat]);
        }

        var line = turf.lineString(pointArr);
        var buffered = turf.buffer(line, 0.001 * bufferValue, { units: 'kilometers', steps: 64 }); //線左右兩邊各50米緩沖區，緩沖區寬共100米

        _polylineBufferPointArr = processCoord(buffered.geometry.coordinates);

        _polylineBuffer = L.polygon(_polylineBufferPointArr, { stroke: true, color: _strokeColr, weight: 2, fill: true, fillColor: _fillColor, fillOpacity: 0.5, pane: _drawPaneBelow });
        drawLayer.addLayer(_polylineBuffer);
    };

    return {
        //配置
        config: function (drawLayer, drawPane, drawPaneBelow) {
            _drawLayer = drawLayer;
            _drawPane = drawPane;
            _drawPaneBelow = drawPaneBelow;
        },

        //開始繪圖
        startDraw: _startDraw,

        //停止繪圖
        stopDraw: _stopDraw,

        //清慷訓圖
        clearDraw: _clearDraw,

        //顯示線緩沖區
        showBuffer: _showBuffer,

        //線
        getPolyline: function () {
            return _polylineClone;
        },

        //線緩沖區
        getPolylineBuffer: function () {
            return _polylineBuffer;
        },

        //注冊繪圖結束回呼
        registerEndDrawCallback: _registerEndDrawCallback,

        //繪制的線的點集合
        getPolylinePointArr: function () {
            return _polylinePointArr;
        },

        //繪制的多邊形點集合
        getPolygonPointArr: function () {
            return _polygonPointArr;
        },

        //繪制的矩形點集合
        getRectanglePointArr: function () {
            return _rectanglePointArr;
        },

        //設定已選擇的位置坐標
        setSelectedLocation: function (lng, lat) {
            if (_locationMarker != null) {
                _drawLayer.removeLayer(_locationMarker);
            }

            var latlng = new L.LatLng(rectifyLat(lat), rectifyLng(lng));
            _locationMarker = new L.Marker(latlng, {});
            _locationMarker.setIcon(iconPrision);
            _drawLayer.addLayer(_locationMarker);
        }
    };

})();

drawUtil.config(drawLayer, drawPane, drawPaneBelow);

View Code

如何使用：

設備點位選擇：

/// <reference path="define.js" />
/// <reference path="icon.js" />
/// <reference path="map.js" />
/// <reference path="draw.js" />
/// <reference path="marker.js" />
/// <reference path="../dist/l.ellipse.js" />
/// <reference path="../dist/turf.js" />

/**
 * 選擇marker drawType 1：多邊形 2：畫線 3：畫矩形 4：畫橢圓 
 */

//選擇完成回呼 
var selectComplateCallback = null;

var selectLocationComplateCallback = null;

//選擇
function selectMarkers(dataIds) {
    var dataIdArr = dataIds.split(',');
    for (var i = 0; i < dataIdArr.length; i++) {
        var dataId = dataIdArr[i];
        selectMarker(dataId);
    }
    if (dataIdArr.length > 0) {
        zoomToBounds(selectedMarkerArr);
    }
}

//選擇
function selectMarker(dataId) {
    for (var i = 0; i < markerArr.length; i++) {
        var marker = markerArr[i];
        if (marker.options.id == dataId) {
            if (!markerExists(selectedMarkerArr, marker)) {
                setMarkerIcon(marker, true);
                selectedMarkerArr.push(marker);
            }
        }
    }
}

//marker在集合中是否存在
function markerExists(arr, marker) {
    var exists = false;
    for (var m = 0; m < arr.length; m++) {
        if (arr[m].options.id == marker.options.id) {
            exists = true;
        }
    }
    return exists;
}

//清空相機選擇
function clearSelect() {
    for (var i = 0; i < selectedMarkerArr.length; i++) {
        setMarkerIcon(selectedMarkerArr[i], false);
        selectedMarkerArr[i].setZIndexOffset(0);
    }
    selectedMarkerArr = [];
    sectorLayer.clearLayers();
    map.closePopup();
}

//Marker去重
function removeRepeatMarkers() {
    for (var i = 0; i < selectedMarkerArr.length - 1; i++) {
        for (j = selectedMarkerArr.length - 1; j > i; j--) {
            if (selectedMarkerArr[i].options.id == selectedMarkerArr[j].options.id) {
                selectedMarkerArr.splice(j, 1);
            }
        }
    }
}

//線緩沖區選擇
function polylineBufferSelect(bufferValue) {
    drawUtil.showBuffer(drawUtil.getPolyline(), bufferValue);

    selectedMarkerArr = selectedMarkerArr.concat(selectByPolygon(markerArr, drawUtil.getPolylineBuffer()));
    removeRepeatMarkers();//去重

    var idArr = [];
    for (var i = 0; i < selectedMarkerArr.length; i++) {
        var marker = selectedMarkerArr[i];
        idArr.push(marker.options.id);
    }

    drawUtil.stopDraw();
    if (selectComplateCallback) selectComplateCallback(idArr);
    if (jsObjExists()) jsObj.AddSelectedByDraw(idArr.join(","));
}

//多邊形選擇
function polygonSelect() {
    drawUtil.startDraw(1);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        if (d.getLatLngs()[0].length > 2) {
            selectedMarkerArr = selectedMarkerArr.concat(selectByPolygon(markerArr, d));
            removeRepeatMarkers();//像機去重

            var idArr = [];
            for (var i = 0; i < selectedMarkerArr.length; i++) {
                var marker = selectedMarkerArr[i];
                idArr.push(marker.options.id);
            }

            if (selectComplateCallback) selectComplateCallback(idArr);
            if (jsObjExists()) jsObj.AddSelectedByDraw(idArr.join(","));
        }
    });
}

//框選
function boxSelect() {
    drawUtil.startDraw(3);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        if (d.getLatLngs()[0].length > 3) {
            selectedMarkerArr = selectedMarkerArr.concat(selectByPolygon(markerArr, d));
            removeRepeatMarkers();//像機去重

            var idArr = [];
            for (var i = 0; i < selectedMarkerArr.length; i++) {
                var marker = selectedMarkerArr[i];
                idArr.push(marker.options.id);
            }

            if (selectComplateCallback) selectComplateCallback(idArr);
            if (jsObjExists()) jsObj.AddSelectedByDraw(idArr.join(","));
        }
    });
}

//橢圓選擇
function ellipseSelect() {
    drawUtil.startDraw(4);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        if (d.length > 1) {
            selectedMarkerArr = selectedMarkerArr.concat(selectByEllipse(markerArr, d));
            removeRepeatMarkers();//像機去重

            var idArr = [];
            for (var i = 0; i < selectedMarkerArr.length; i++) {
                var marker = selectedMarkerArr[i];
                idArr.push(marker.options.id);
            }

            if (selectComplateCallback) selectComplateCallback(idArr);
            if (jsObjExists()) jsObj.AddSelectedByDraw(idArr.join(","));
        }
    });
}

//圓選
function circleSelect() {
    drawUtil.startDraw(6);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        if (d.length > 1) {
            selectedMarkerArr = selectedMarkerArr.concat(selectByEllipse(markerArr, d));
            removeRepeatMarkers();//像機去重

            var idArr = [];
            for (var i = 0; i < selectedMarkerArr.length; i++) {
                var marker = selectedMarkerArr[i];
                idArr.push(marker.options.id);
            }

            if (selectComplateCallback) selectComplateCallback(idArr);
            if (jsObjExists()) jsObj.AddSelectedByDraw(idArr.join(","));
        }
    });
}

//線選
function lineSelect() {
    drawUtil.startDraw(2);
    drawUtil.registerEndDrawCallback(function (line) {
        if (line) {
            var popup = layer.open({
                type: 0,
                btn: ['確定', '取消'],
                title: '請輸入緩沖區半徑',
                content: '<div style="margin:0 auto; width:120px;"><input id="radius" type="text" value="https://www.cnblogs.com/s0611163/p/2" style="padding:5px; width:120px; font-size:16px;" onkeyup="this.value=https://www.cnblogs.com/s0611163/p/this.value.replace(/[^0-9]/g,/'\')" /></div>',
                yes: function (index, layero) {
                    var val = $(layero).find("#radius").val();

                    var reg = /^[1-9][0-9]{0,2}$/;
                    if (!reg.test(val)) {
                        alert("請輸入3位以內的整數");
                        return;
                    }

                    polylineBufferSelect(val);

                    layer.close(popup);
                },
                btn2: function () {
                    drawUtil.stopDraw();
                },
                cancel: function () {
                    drawUtil.stopDraw();
                }
            });
        }
    });
}

//點選
function pointSelect() {
    isPointSelect = true;
}

//選擇位置
function selectLocation() {
    drawUtil.startDraw(5);
    drawUtil.registerEndDrawCallback(function (lat, lng) {
        if (selectLocationComplateCallback) selectLocationComplateCallback(lat, lng);
    });
}

//多邊形選擇
function selectByPolygon(markerArr, polygon) {
    drawType = null;
    var selectedMarkerArr = [];
    var poly = turf.polygon(polygon.toGeoJSON(8).geometry.coordinates);
    for (var i = 0; i < markerArr.length; i++) {
        var marker = markerArr[i];
        var point = turf.point(marker.toGeoJSON(8).geometry.coordinates);

        if (turf.booleanPointInPolygon(point, poly)) {
            setMarkerIcon(marker, true);
            selectedMarkerArr.push(marker);
        }
    }
    return selectedMarkerArr;
}

//矩形選擇
function selectByRectangle(markerArr, rectangle) {
    drawType = null;
    var selectedMarkerArr = [];
    var poly = turf.polygon(rectangle.toGeoJSON(8).geometry.coordinates);
    for (var i = 0; i < markerArr.length; i++) {
        var marker = markerArr[i];
        var point = turf.point(marker.toGeoJSON(8).geometry.coordinates);

        if (turf.booleanPointInPolygon(point, poly)) {
            if (layerIndex == 0) {
                setCameraMarkerIcon(marker, true);
            } else {
                setMarkerIcon(marker, true);
            }
            selectedMarkerArr.push(marker);
        }
    }
    return selectedMarkerArr;
}

//橢圓選擇
function selectByEllipse(markerArr, ellipsePointArr) {
    drawType = null;
    var selectedMarkerArr = [];
    for (var i = 0; i < markerArr.length; i++) {
        var marker = markerArr[i];
        var point = { x: marker.getLatLng().lng, y: marker.getLatLng().lat };

        if (isPointInEllipse(point, ellipsePointArr)) {
            setMarkerIcon(marker, true);
            selectedMarkerArr.push(marker);
        }
    }
    return selectedMarkerArr;
}

View Code

距離面積測量：

/// <reference path="define.js" />
/// <reference path="icon.js" />
/// <reference path="map.js" />
/// <reference path="draw.js" />
/// <reference path="../libs/layer/layer.js" />

/**
 * 量算
 */

//距離量算
function measureDistance() {
    drawUtil.startDraw(2);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        var pointArr = [];
        d.getLatLngs().map(item=> {
            pointArr.push([item.lng, item.lat]);
        });
        if (pointArr.length > 1) {
            var line = turf.lineString(pointArr);
            var length = turf.length(line, { units: 'kilometers' });
            if (length < 1) {
                layer.alert((length * 1000).toFixed(2) + "米", { title: "長度" });
            } else {
                layer.alert(length.toFixed(5) + "公里", { title: "長度" });
            }
        }
    });
}

//面積量算
function measureArea() {
    drawUtil.startDraw(1);
    drawUtil.registerEndDrawCallback(function (d) {
        drawUtil.stopDraw();
        if (!d) return;
        var pointArr = [];
        d.getLatLngs()[0].map(item=> {
            pointArr.push([item.lng, item.lat]);
        });
        if (pointArr.length > 0) {
            pointArr.push(pointArr[0]);
        }
        if (pointArr.length > 3) {
            var line = turf.lineString(pointArr);
            var polygon = turf.lineToPolygon(line);
            var unkinkPolygon = turf.unkinkPolygon(polygon);
            var area = turf.area(unkinkPolygon);
            if (area < 1000000) {
                layer.alert(area.toFixed(4) + "平方米", { title: "面積" });
            } else {
                layer.alert((area / 1000000.0).toFixed(6) + "平方公里", { title: "面積" });
            }
        }
    });
}

View Code

效果圖：

轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/793.html

標籤：GIS

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