Google Maps Drawing Manager限制为1个多边形

时间:2013-01-04 23:11:30

标签: javascript google-maps javascript-events google-maps-api-3

我正在使用google maps v3 API创建地图。使用绘图管理器绘制形状。有没有办法在绘制1个多边形后禁用多边形按钮?我一直在通过API阅读,但找不到多边形启动的任何事件,仅用于polygoncomplete。

也许有办法检测绘图模式的变化?或删除google.maps.drawing.OverlayType.POLYGON,但如果当前多边形被删除则将其放回去?

1 个答案:

答案 0 :(得分:37)

documentation

  1. this sample开始。

  2. 隐藏polygoncomplete事件中的绘图控件

        drawingManager.setOptions({
          drawingControl: false
        });
    
  3. 在deleteSelectedShape函数中添加绘图控件

      drawingManager.setOptions({
       drawingControl: true
     });
    
  4. 将drawingManager配置为仅添加多边形

      drawingControlOptions: {
        drawingModes: [
          google.maps.drawing.OverlayType.POLYGON
        ]
      },
    
  5. working example

    代码段

    var drawingManager;
    var selectedShape;
    var colors = ['#1E90FF', '#FF1493', '#32CD32', '#FF8C00', '#4B0082'];
    var selectedColor;
    var colorButtons = {};
    
    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() {
      if (selectedShape) {
        selectedShape.setMap(null);
        // To show:
        drawingManager.setOptions({
          drawingControl: true
        });
      }
    }
    
    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: 10,
        center: new google.maps.LatLng(22.344, 114.048),
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        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(event) {
        if (event.type == google.maps.drawing.OverlayType.CIRCLE) {
          var radius = event.overlay.getRadius();
        }
      });
      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);
          // To hide:
          drawingManager.setOptions({
            drawingControl: false
          });
    
          // 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;
          google.maps.event.addListener(newShape, 'click', function() {
            setSelection(newShape);
          });
          setSelection(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();
    }
    google.maps.event.addDomListener(window, 'load', initialize);
    #map,
    html,
    body {
      padding: 0;
      margin: 0;
      height: 100%;
    }
    
    #panel {
      width: 200px;
      font-family: Arial, sans-serif;
      font-size: 13px;
      float: right;
      margin: 10px;
    }
    
    #color-palette {
      clear: both;
    }
    
    .color-button {
      width: 14px;
      height: 14px;
      font-size: 0;
      margin: 2px;
      float: left;
      cursor: pointer;
    }
    
    #delete-button {
      margin-top: 5px;
    }
    <script src="http://maps.google.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=drawing"></script>
    <div id="panel">
      <div id="color-palette"></div>
      <div>
        <button id="delete-button">Delete Selected Shape</button>
      </div>
    </div>
    <div id="map"></div>