我有一个非常简单的Bing地图程序,我想让用户在地图上画一个形状,我有绘图工具和一切设置,但是Bing的事件似乎没有以正确的方式触发-
开始绘图-当我将绘图工具更改为直线或多边形时触发。
绘图更改-当我将绘图工具更改为直线或多边形时触发
当我开始绘制一个新的多边形时,我只想清除映射中的现有多边形--但是对绘图管理器上的getPrimitives函数进行调用会清除绘图模式,因此我考虑缓存绘图模式,读取原语删除它们,然后重置绘图模式,然后绘图管理器上的setDrawingMode方法再次调用绘图,这再次触发整个过程。
有谁知道怎么克服这个问题吗。
发布于 2017-05-05 16:38:06
当您单击该模式时,绘图已启动事件看起来确实很奇怪。会让团队调查的。
然而,你想要做的事情会有一些潜在的问题。如果在用户开始在地图上绘制多边形时清除绘图管理器,则该多边形也将从地图中移除。您可以做的是,当完成绘制一个多边形,是将它移动到一个单独的层,然后您可以清除该层而不影响绘图管理器。如果您只对绘制多边形感兴趣,您甚至不需要绘图管理器,因为您可以自己使用绘图工具和按钮来处理这个问题。例如:CreateShape
下面是使用绘图管理器实现所需内容的代码示例:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8" />
<script type='text/javascript'>
var map, baseLayer, drawingManager;
function GetMap() {
map = new Microsoft.Maps.Map('#myMap', {
credentials: 'YourBingMapsKey'
});
//Load the DrawingTools module
Microsoft.Maps.loadModule('Microsoft.Maps.DrawingTools', function () {
//Create a base layer to add drawn shapes.
baseLayer = new Microsoft.Maps.Layer();
map.layers.insert(baseLayer);
//Create an instance of the DrawingTools class and bind it to the map.
var tools = new Microsoft.Maps.DrawingTools(map);
//Show the drawing toolbar and enable editting on the map.
tools.showDrawingManager(function (manager) {
drawingManager = manager;
Microsoft.Maps.Events.addHandler(drawingManager, 'drawingEnded', function (e) {
//When use finisihes drawing a shape, removing it from the drawing layer and add it to the base layer.
var shapes = drawingManager.getPrimitives();
if (shapes) {
drawingManager.clear();
baseLayer.add(shapes);
}
});
Microsoft.Maps.Events.addHandler(drawingManager, 'drawingChanging', function (e) {
//When the drawing is changing, clear the base layer.
baseLayer.clear();
});
})
});
}
</script>
<script type='text/javascript' src='https://www.bing.com/api/maps/mapcontrol?callback=GetMap' async defer></script>
</head>
<body>
<div id="myMap" style="position:relative;width:600px;height:400px;"></div>
</body>
</html>下面是一个类似的代码示例,它不需要绘图管理器和自定义按钮就可以开始绘制多边形。
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8" />
<script type='text/javascript'>
var map, baseLayer, tools, currentShape;
function GetMap() {
map = new Microsoft.Maps.Map('#myMap', {
credentials: 'YourBingMapsKey'
});
//Create a base layer to add drawn shapes.
baseLayer = new Microsoft.Maps.Layer();
map.layers.insert(baseLayer);
//Load the DrawingTools module.
Microsoft.Maps.loadModule('Microsoft.Maps.DrawingTools', function () {
//Create an instance of the DrawingTools class and bind it to the map.
tools = new Microsoft.Maps.DrawingTools(map);
Microsoft.Maps.Events.addHandler(tools, 'drawingChanging', function (e) {
//When the drawing is changing, clear the base layer.
baseLayer.clear();
});
//When the user presses 'esc', take the polygon out of edit mode and re-add to base map.
document.getElementById('myMap').onkeypress = function (e) {
if (e.charCode === 27) {
tools.finish(shapeDrawn);
currentShape = null;
}
};
});
}
function drawPolygon() {
//Stop any current drawing.
if (currentShape) {
tools.finish(shapeDrawn);
currentShape = null;
}
//Create a new polygon.
tools.create(Microsoft.Maps.DrawingTools.ShapeType.polygon, function (s) {
currentShape = s;
});
}
function shapeDrawn(s) {
baseLayer.add(s);
}
</script>
<script type='text/javascript' src='https://www.bing.com/api/maps/mapcontrol?callback=GetMap' async defer></script>
</head>
<body>
<div id="myMap" style="position:relative;width:600px;height:400px;"></div><br />
<input type="button" onclick="drawPolygon()" value="Draw Polygon" />
</body>
</html>https://stackoverflow.com/questions/43803421
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