onFinish
onFinishCallback(points, cancellationCallback, isSelfIntersect)
This callback function is called when the draw operation is complete, e.g., when the user right-clicks or long press for mobile.
Parameters
| Name | Type | Description | 
| points | Array of Cesium.Cartesian3 | Array which represents the points drawn. | 
| cancellationCallback | function | A function to be executed which cancels the last added point. | 
| isSelfIntersect | Boolean | Determines whether the polyline crosses itself. |