Event after modifying polygon in Google Maps API v3
google.maps.event.addListener(yourPolygon.getPath(), 'insert_at', function(index, obj) {
//polygon object: yourPolygon
});
google.maps.event.addListener(yourPolygon.getPath(), 'set_at', function(index, obj) {
//polygon object: yourPolygon
});
The above code is working for me. Where set_at
is fired when we modify a polygon area from a highlighted dot (edges) and insert_at
is fired when we drag point that is between highlighted edges.
I used them in the polygoncomplete
event and after loading a polygon from the database. It is working fine for them.
To avoid the problems mentioned with set_at and dragging, I added the following, which disables event broadcasting for set_at when the drawing is being dragged. I created a class that extends the polygon class, and added this method:
ExtDrawingPolygon.prototype.enableCoordinatesChangedEvent = function(){
var me = this,
superClass = me.superClass,
isBeingDragged = false,
triggerCoordinatesChanged = function(){
//broadcast normalized event
google.maps.event.trigger(superClass, 'coordinates_changed');
};
// If the overlay is being dragged, set_at gets called repeatedly,
// so either we can debounce that or ignore while dragging,
// ignoring is more efficient.
google.maps.event.addListener(superClass, 'dragstart', function(){
isBeingDragged = true;
});
// If the overlay is dragged
google.maps.event.addListener(superClass, 'dragend', function(){
triggerCoordinatesChanged();
isBeingDragged = false;
});
// Or vertices are added to any of the possible paths, or deleted
var paths = superClass.getPaths();
paths.forEach(function(path, i){
google.maps.event.addListener(path, "insert_at", function(){
triggerCoordinatesChanged();
});
google.maps.event.addListener(path, "set_at", function(){
if(!isBeingDragged){
triggerCoordinatesChanged();
}
});
google.maps.event.addListener(path, "remove_at", function(){
triggerCoordinatesChanged();
});
});
};
It added a "coordinates_changed" event to the polygon itself, so other code can just listen for a nice, single, simplified event.
I solved it by calling .getPath() and putting the listener inside the listener which is called every time a shape is clicked. I think the Google API documentation is not very clear on how to use the set_at so it may be useful for other people too.
// 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() {
google.maps.event.addListener(newShape.getPath(), 'set_at', function() {
console.log("test");
});
google.maps.event.addListener(newShape.getPath(), 'insert_at', function() {
console.log("test");
});
setSelection(newShape);
});