如何刪除多邊形的頂點（節點）與孔（谷歌地圖V3）

Question

我已經從Ian Grainger這個例子（解決方案），但我添加了一個帶有內孔的多邊形。

This example適用於外部頂點路徑，但不適用於內部頂點路徑。

我需要爲內部和外部節點實現事件監聽器，因爲在內部頂點上的火災事件時，刪除外部頂點。它行不通。

有人可以提供一些關於如何解決這個問題的例子嗎？

Answer 1

你的問題之一是其中有一個洞的多邊形有多個（在這種情況下是兩個）路徑，並且你沒有爲這兩個路徑上的改變添加監聽器。下面是一個概念證明，它不是完美的，有時標記是孤立的，但應該是一個起點。雙擊頂點下方的藍色標記以刪除它們（我無法讓您的「X」可靠地工作）。

proof of concept fiddle

updated proof of concept with white markers

代碼片段：

var G = google.maps; 
 
var zoom = 8; 
 
var centerPoint = new G.LatLng(37.286172, -121.80929); 
 
var map; 
 

 

 
$(function() { 
 
    // create options object 
 
    var myOptions = { 
 
    center: centerPoint, 
 
    zoom: zoom, 
 
    mapTypeId: G.MapTypeId.ROADMAP 
 
    }; 
 

 
    // create map with options 
 
    map = new G.Map($("#map_canvas")[0], myOptions); 
 

 
    addPolygon(map); 
 
}); 
 

 

 
function addPolygon(map) { 
 
    var paths = [ 
 
    [new G.LatLng(37.686172, -122.20929), 
 
     new G.LatLng(37.696172, -121.40929), 
 
     new G.LatLng(36.706172, -121.40929), 
 
     new G.LatLng(36.716172, -122.20929), 
 
     new G.LatLng(37.686172, -122.20929) 
 
    ], 
 

 
    [new G.LatLng(37.486172, -122.00929), 
 
     new G.LatLng(37.086172, -122.00929), 
 
     new G.LatLng(37.086172, -121.60929), 
 
     new G.LatLng(37.486172, -121.60929), 
 
     new G.LatLng(37.486172, -122.00929) 
 
    ] 
 
    ]; 
 

 
    poly = new G.Polygon({ 
 
    clickable: false, 
 
    paths: paths, 
 
    map: map 
 
    }); 
 
    polygonBinder(poly); 
 
    poly.setEditable(true); 
 
    G.event.addListener(poly.getPaths().getAt(0), 'insert_at', addClickMarker0); 
 
    G.event.addListener(poly.getPaths().getAt(1), 'insert_at', addClickMarker1); 
 
} 
 

 
function polygonBinder(poly) { 
 
    poly.binder0 = new MVCArrayBinder(poly.getPaths().getAt(0)); 
 
    poly.binder1 = new MVCArrayBinder(poly.getPaths().getAt(1)); 
 
    poly.markers = []; 
 
    for (var i = 0; i < poly.getPaths().getLength(); i++) { 
 
    poly.markers[i] = []; 
 
    for (var j = 0; j < poly.getPaths().getAt(i).getLength(); j++) { 
 
     var mark = new G.Marker({ 
 
     map: map, 
 
     icon: { 
 
      path: G.SymbolPath.CIRCLE, 
 
      scale: 8, 
 
      strokeWeight: 2, 
 
      strokeColor: 'blue', 
 
      fillColor: 'blue', 
 
      fillOpacity: 1 
 
     }, 
 
     draggable: true, 
 
     title: "double click to delete [" + i + "," + j + "]", 
 
     position: poly.getPaths().getAt(i).getAt(j) 
 
     }); 
 
     poly.markers[i][j] = mark; 
 
     mark.bindTo('position', poly["binder" + i], (j).toString()); 
 
     G.event.addListener(mark, "dblclick", deleteMark); 
 
    } 
 
    } 
 

 
} 
 

 
function addClickMarker0(index) { 
 
    addClickMarker(index, 0); 
 
} 
 

 
function addClickMarker1(index) { 
 
    addClickMarker(index, 1); 
 
} 
 

 
function deleteMark(evt) { 
 
    var minDist = Number.MAX_VALUE; 
 
    var minPathIdx = -1; 
 
    var minIdx = -1; 
 
    var i, j; 
 
    for (i = 0; i < poly.getPaths().getLength(); i++) { 
 
    for (j = 0; j < poly.getPaths().getAt(i).getLength(); j++) { 
 
     var distance = G.geometry.spherical.computeDistanceBetween(evt.latLng, poly.getPaths().getAt(i).getAt(j)); 
 
     if (distance < minDist) { 
 
     minDist = distance; 
 
     minPathIdx = i; 
 
     minIdx = j; 
 
     } 
 
     if (distance < 10) { 
 
     document.getElementById('info').innerHTML = "deleted path=" + i + " idx=" + j + " dist<10 minDist=" + minDist + " meters"; 
 
     poly.getPaths().getAt(i).removeAt(j); 
 
     break; 
 
     } 
 
    } 
 
    } 
 
    if ((i == poly.getPaths().getLength()) && (j == poly.getPaths(i - 1).getLength())) { 
 
    poly.getPaths().getAt(minPathIdx).removeAt(minIdx); 
 
    document.getElementById('info').innerHTML = "deleted path=" + minPathIdx + " idx=" + minIdx + " dist=" + minDist + " meters"; 
 
    } 
 
    this.setMap(null); 
 
} 
 

 
function addClickMarker(index, pathIdx) { 
 
    var path = this; 
 
    // rebind binder 
 
    for (var i = 0; i < poly.markers[pathIdx].length; i++) { 
 
    poly.markers[pathIdx][i].setMap(null); 
 
    } 
 
    poly.markers[pathIdx] = []; 
 
    for (var i = 0; i < poly.getPaths().getAt(pathIdx).getLength(); i++) { 
 
    var mark = new G.Marker({ 
 
     map: map, 
 
     icon: { 
 
     path: G.SymbolPath.CIRCLE, 
 
     scale: 8, 
 
     strokeWeight: 2, 
 
     strokeColor: 'blue', 
 
     fillColor: 'blue', 
 
     fillOpacity: 1 
 
     }, 
 
     draggable: true, 
 
     title: "double click to delete [" + pathIdx + "," + i + "]", 
 
     position: poly.getPaths().getAt(pathIdx).getAt(i) 
 
    }); 
 
    poly.markers[pathIdx][i] = mark; 
 
    mark.bindTo('position', poly["binder" + pathIdx], (i).toString()); 
 
    G.event.addListener(mark, "dblclick", deleteMark); 
 
    } 
 
} 
 

 
function MVCArrayBinder(mvcArray) { 
 
    this.array_ = mvcArray; 
 
} 
 
MVCArrayBinder.prototype = new google.maps.MVCObject(); 
 
MVCArrayBinder.prototype.get = function(key) { 
 
    if (!isNaN(parseInt(key))) { 
 
    return this.array_.getAt(parseInt(key)); 
 
    } else { 
 
    this.array_.get(key); 
 
    } 
 
} 
 
MVCArrayBinder.prototype.set = function(key, val) { 
 
    if (!isNaN(parseInt(key))) { 
 
    this.array_.setAt(parseInt(key), val); 
 
    } else { 
 
    this.array_.set(key, val); 
 
    } 
 
}

html, 
 
body, 
 
#map_canvas { 
 
    height: 100%; 
 
    width: 100%; 
 
    margin: 0; 
 
    padding: 0 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<script src="https://maps.googleapis.com/maps/api/js?libraries=drawing,geometry"></script> 
 
<div id="info"></div> 
 
<div id="map_canvas" style="width:100%; height:100%"></div>