[英]how to handle openlayers draw polygon event
我在OpenLayers應用程序中有這樣的繪制控件。
var drawControls = {
polygon: new OpenLayers.Control.DrawFeature(polygonLayer, OpenLayers.Handler.Polygon),
box: new OpenLayers.Control.DrawFeature(boxLayer, OpenLayers.Handler.RegularPolygon,{
handlerOptions: {
sides: 4,
irregular: true
}
})
};
我正在使用控件的激活功能來激活此控件。
var control = drawControls[selected.key];
control.activate();
這將在地圖上繪制多邊形。 但是我無法訪問此控件的事件。 例如,在繪制結束時事件應給我一個多邊形或框。
這是使用featureadded
事件的示例。
// Add a polygon layer to which polygons will be drawn.
var polygonLayer = new OpenLayers.Layer.Vector("Polygon Layer", {
projection: "EPSG:4326"
});
map.addLayers([polygonLayer]);
// Initialize the polygon editor.
var polygonEditor = new OpenLayers.Control.DrawFeature(polygonLayer,
OpenLayers.Handler.Polygon);
// And its event listener when the feature is added.
polygonEditor.events.register('featureadded', polygonEditor, function(evt) {
// Here, you should see the geometry of the drawn feature in your console.
var geom = evt.feature.geometry;
console.log(geom);
});
還有一個樣品提琴 。
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