Hi Mitchell112,
The fullExtent property of GraphicsLayer represents the entire earth, with the intersection of the equator and the prime meridian as the center(0,0).
If you are getting the extents of a graphic layer to submit to the view for zooming, the view does this for you from the layre's graphics:
view.goTo(graphicsLayer.graphics.toArray());
However, if you want these values for other purposes, a simple way is this. (There is, probably, a utility to get extents of an array of geometries, but this works just fine):
//First, and obviously you want your layer to have all of its graphics, an empty layer wont work.
graphicsLayer.graphics.push(...myArrayOfGraphics);//the ellipse (...) iterates the push method.
// Start with the first graphic and iterate the layer's graphics to build extent
let extent = graphicsLayer.graphics.getItemAt(0).geometry.extent;
graphicsLayer.graphics.forEach((graphic)=>{
let gextent = graphic.geometry.extent;
if(!gextent.equals(extent)){//this should only skip the first one
extent = extent.union(gextent);
}
});
let center = exent.center;// The center of the layer's extent.
//extent, above will be the entire extent of the layer's graphics.