监听polygon变化

最新推荐文章于 2024-12-20 11:36:52 发布

转载最新推荐文章于 2024-12-20 11:36:52 发布 · 240 阅读

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原文链接：http://www.cnblogs.com/qyhol/p/5604304.html

Polygons are made of Paths which are just MVCArrays (in this case, they're a list of LatLng objects). MVCArrays have three events: insert_at, remove_at, and set_at. We can use those events to detect changes in the points of the Polygon.

There are also drag events for polygons: dragstart, drag, and dragend. It's best to listen for dragend if you want to know that a shape was just dragged.

All together, we can detect any changes to a polygon:

// Loop through all paths in the polygon and add listeners
// to them. If we just used `getPath()` then we wouldn't 
// detect all changes to shapes like donuts. polygon.getPaths().forEach(function(path, index){ google.maps.event.addListener(path, 'insert_at', function(){ // New point }); google.maps.event.addListener(path, 'remove_at', function(){ // Point was removed }); google.maps.event.addListener(path, 'set_at', function(){ // Point was moved }); }); google.maps.event.addListener(polygon, 'dragend', function(){ // Polygon was dragged });

原文:http://stackoverflow.com/questions/20789385/how-can-i-detect-when-an-editable-polygon-is-modified