13

我正在编写一个应用程序，允许用户使用 Google Maps API 绘制地理多边形“区域”并将它们保存在数据库中。每个用户只能有一个区域，所以我通过切换到手并在overlaycomplete上隐藏绘图工具来限制这一点。在覆盖完成之后，我可以点击保存，它保存在我的数据库中就好了——所以这个位有效。此外，我能够从数据库中检索多边形并将其显示为地图上的可编辑多边形。我遇到的问题是：

  1. 当试图拖动插入多边形的点时，它们会“卡”在鼠标上并且永远不会释放。我的猜测是某种mouseup问题？

  2. 尽管已经存在一个多边形，但我仍然可以绘制另一个多边形。如果从数据库加载多边形，我应该在一开始就隐藏绘图工具吗？

  3. 如何将事件附加到从数据库中提取的多边形，以便捕获其顶点坐标？

您可以在此处查看我当前的代码：http: //jsfiddle.net/FUUxz/或以下：

JS：

            var map; // Global declaration of the map
            var iw = new google.maps.InfoWindow(); // Global declaration of the infowindow
            var lat_longs = new Array();
            var markers = new Array();
            var drawingManager;
            function initialize() {

                 var myLatlng = new google.maps.LatLng(40.9403762, -74.1318096);
                var myOptions = {
                    zoom: 13,
                    center: myLatlng,
                    mapTypeId: google.maps.MapTypeId.ROADMAP}
                map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
                drawingManager = new google.maps.drawing.DrawingManager({
                drawingMode: google.maps.drawing.OverlayType.POLYGON,
                drawingControl: true,
                drawingControlOptions: {
                    position: google.maps.ControlPosition.TOP_CENTER,
                    drawingModes: [google.maps.drawing.OverlayType.POLYGON]
                },
                        polygonOptions: {editable:true,fillColor:'#ff0000',strokeColor:'#ff0000',strokeWeight:2}
            });
            drawingManager.setMap(map);

            google.maps.event.addListener(drawingManager, "overlaycomplete", function(event) {
                var newShape = event.overlay;
                newShape.type = event.type;
                if (event.type==google.maps.drawing.OverlayType.POLYGON) {
                        overlayClickListener(event.overlay);$('#polygon').val(event.overlay.getPath().getArray());drawingManager.setOptions({drawingMode:null,drawingControl:false});
                    }

            });
                var polygon_plan_0 = [
                    new google.maps.LatLng(40.9534555976547, -74.0871620178223)
                    ,
                    new google.maps.LatLng(40.9410084152192, -74.0948867797852)
                    ,
                    new google.maps.LatLng(40.9411380854622, -74.1165161132812)
                    ,
                    new google.maps.LatLng(40.9490474888751, -74.1221809387207)
                    ,
                    new google.maps.LatLng(40.955140973234, -74.124584197998)
                    ,
                    new google.maps.LatLng(40.9604561066844, -74.1153144836426)
                    ,
                    new google.maps.LatLng(40.9534555976547, -74.0871620178223)
                    ];
                    lat_longs.push(new google.maps.LatLng(40.9534555976547, -74.0871620178223));

                    lat_longs.push(new google.maps.LatLng(40.9410084152192, -74.0948867797852));

                    lat_longs.push(new google.maps.LatLng(40.9411380854622, -74.1165161132812));

                    lat_longs.push(new google.maps.LatLng(40.9490474888751, -74.1221809387207));

                    lat_longs.push(new google.maps.LatLng(40.955140973234, -74.124584197998));

                    lat_longs.push(new google.maps.LatLng(40.9604561066844, -74.1153144836426));

                    lat_longs.push(new google.maps.LatLng(40.9534555976547, -74.0871620178223));

            var polygon_0 = new google.maps.Polygon({
                path: polygon_plan_0,

                strokeColor: "#ff0000",
                strokeOpacity: 0.8,
                strokeWeight: 2,
                fillColor: "#ff0000",
                fillOpacity: 0.3,
                editable: true
            });

            polygon_0.setMap(map);


            google.maps.event.addListener(polygon_0, "mouseup", function(event) {
                overlayClickListener(event.overlay);$('#polygon').val(event.overlay.getPath().getArray());drawingManager.setOptions({drawingMode:null,drawingControl:false});
            });


            }


        function createMarker(markerOptions) {
            var marker = new google.maps.Marker(markerOptions);
            markers.push(marker);
            lat_longs.push(marker.getPosition());
            return marker;
        }

initialize();

function overlayClickListener(overlay) {
    google.maps.event.addListener(overlay, "mouseup", function(event){
        $('#polygon').val(overlay.getPath().getArray());
    });
}

HTML：

<div id="map_canvas" style="width:100%; height:450px;"></div>
<form action="http://garbagedayreminder.com/test/save" method="post" accept-charset="utf-8" id="map_form">
<input type="text" name="polygon" value="" id="polygon"  />
<input type="submit" name="save" value="Save!" id="save"  />
</form>
4

1 回答 1

12

我知道这有点老，但我一直在研究类似的情况。从数据库加载多边形，允许它们可编辑，并允许将其他多边形添加到地图中。可能有更好的方法可以做到这一点，但这是功能性的，希望能让其他人走上正轨。

      var areas = ( <?php echo json_encode($areas);?> );
  var coords = ( <?php echo json_encode($coords);?> );

  var drawingManager;
  var selectedShape;
  var colors = ['#1E90FF', '#FF1493', '#32CD32', '#FF8C00', '#4B0082'];
  var selectedColor;
  var colorButtons = {};

  // Saving vars
  var selectedShape;
  var contentString;
  var polygons = [];
  var newPolys = [];

  function clearSelection() {
    if (selectedShape) {
      selectedShape.setEditable(false);
      selectedShape = null;
    }
  }

  function setSelection(shape) {
    clearSelection();
    selectedShape = shape;
    shape.setEditable(true);
    selectColor(shape.get('fillColor') || shape.get('strokeColor'));
  }

  function deleteSelectedShape(e) {
    if (selectedShape) {
      selectedShape.setMap(null);
      for (i=0; i < polygons.length; i++) {   // Clear out the polygons entry
        if (selectedShape.getPath == polygons[i].getPath) {
            polygons.splice(i, 1);
        }
      }
    }
  }

  function selectColor(color) {
    selectedColor = color;
    for (var i = 0; i < colors.length; ++i) {
      var currColor = colors[i];
      colorButtons[currColor].style.border = currColor == color ? '2px solid #789' : '2px solid #fff';
    }

    // Retrieves the current options from the drawing manager and replaces the
    // stroke or fill color as appropriate.
    var polylineOptions = drawingManager.get('polylineOptions');
    polylineOptions.strokeColor = color;
    drawingManager.set('polylineOptions', polylineOptions);

    var rectangleOptions = drawingManager.get('rectangleOptions');
    rectangleOptions.fillColor = color;
    drawingManager.set('rectangleOptions', rectangleOptions);

    var circleOptions = drawingManager.get('circleOptions');
    circleOptions.fillColor = color;
    drawingManager.set('circleOptions', circleOptions);

    var polygonOptions = drawingManager.get('polygonOptions');
    polygonOptions.fillColor = color;
    drawingManager.set('polygonOptions', polygonOptions);
  }

  function setSelectedShapeColor(color) {
    if (selectedShape) {
      if (selectedShape.type == google.maps.drawing.OverlayType.POLYLINE) {
        selectedShape.set('strokeColor', color);
      } else {
        selectedShape.set('fillColor', color);
      }
    }
  }

  function makeColorButton(color) {
    var button = document.createElement('span');
    button.className = 'color-button';
    button.style.backgroundColor = color;
    google.maps.event.addDomListener(button, 'click', function() {
      selectColor(color);
      setSelectedShapeColor(color);
    });

    return button;
  }

   function buildColorPalette() {
     var colorPalette = document.getElementById('color-palette');
     for (var i = 0; i < colors.length; ++i) {
       var currColor = colors[i];
       var colorButton = makeColorButton(currColor);
       colorPalette.appendChild(colorButton);
       colorButtons[currColor] = colorButton;
     }
     selectColor(colors[0]);
   }

  function initialize() {
      var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 7,
      center: new google.maps.LatLng(40.2444, -111.6608),           // Utah default coords
      mapTypeId: google.maps.MapTypeId.Terrain,
      disableDefaultUI: true,
      zoomControl: true
    });

    var polyOptions = {
      strokeWeight: 0,
      fillOpacity: 0.45,
      editable: true
    };


    // Creates a drawing manager attached to the map that allows the user to draw
    // markers, lines, and shapes.
    drawingManager = new google.maps.drawing.DrawingManager({
      drawingMode: google.maps.drawing.OverlayType.POLYGON,
      drawingControlOptions: {
        drawingModes: [google.maps.drawing.OverlayType.POLYGON]},
      markerOptions: {
        draggable: true
      },
      polylineOptions: {
        editable: true
      },
      rectangleOptions: polyOptions,
      circleOptions: polyOptions,
      polygonOptions: polyOptions,
      map: map
    });

    google.maps.event.addListener(drawingManager, 'overlaycomplete', function(e) {
        if (e.type != google.maps.drawing.OverlayType.MARKER) {
        // Switch back to non-drawing mode after drawing a shape.
        drawingManager.setDrawingMode(null);
        // Add an event listener that selects the newly-drawn shape when the user
        // mouses down on it.
        var newShape = e.overlay;
        newShape.type = e.type;
        polygons.push(newShape);

        setSelection(newShape);


        google.maps.event.addListener(newShape, 'click', function() {
          setSelection(newShape);
        });

        google.maps.event.addListener(newShape, 'mouseup', function() {
          for (i=0; i < polygons.length; i++) {   // Clear out the old polygons entry
            if (newShape.getPath == polygons[i].getPath) {
                polygons.splice(i, 1);
            }
          }
          polygons.push(newShape);
        });
      }
    });


    // Clear the current selection when the drawing mode is changed, or when the
    // map is clicked.
    google.maps.event.addListener(drawingManager, 'drawingmode_changed', clearSelection);
    google.maps.event.addListener(map, 'click', clearSelection);
    google.maps.event.addDomListener(document.getElementById('delete-button'), 'click', deleteSelectedShape);

    buildColorPalette();


   /* Load Shapes that were previously saved */
    for (var inc = 0, ii = areas.length; inc < ii; inc++) {
      var newCoords = [];
      for (var c = 0, cc = coords.length; c < cc; c++) {
          if (coords[c].polygon == areas[inc].polygon) {
            var point = coords[c];
            newCoords.push(new google.maps.LatLng(point.lat, point.lng));
          }
      }

      newPolys[inc] = new google.maps.Polygon({
        path: newCoords,
        strokeWeight: 0,
        fillColor: areas[inc].fillColor,
        fillOpacity: areas[inc].fillOpacity
      });
      newPolys[inc].setMap(map);
      polygons.push(newPolys[inc]);
      addNewPolys(newPolys[inc]);
    }


    function addNewPolys(newPoly) {
        google.maps.event.addListener(newPoly, 'click', function() {
            setSelection(newPoly);
        });
    }

  }

  google.maps.event.addDomListener(window, 'load', initialize);
于 2013-11-16T21:15:16.703 回答