Merge branch 'master' into energy-display

js/client/views/3D/trajectory-view.js

@@ -25,6 +25,7 @@ class TrajectoryView3D extends View3D {
         // Create a fake trajectory line to visualize.
         this._visualLine = new TrajectoryLine(this._type, this._scene, new THREE.Vector3(), new THREE.Vector3(), new THREE.Vector3(), 11, matrix.bMatrix);
         this._visualLine.setVisibility(false);
+        this._drawLine = false;
 
         dragControls.addEventListener('dragstart', (event) => {
 
@@ -73,8 +74,10 @@ class TrajectoryView3D extends View3D {
 
         dragControls.addEventListener('drag', (event) => {
 
-            // Use the point from the scattering view.
-            this._visualLine.end = this.getPoint(this._type);
+            if (this._drawLine) {
+                // Use the point from the scattering view.
+                this._visualLine.end = this.getPoint(this._type);
+            }
         });
 
         document.addEventListener('mousedown', (event) => {
@@ -88,6 +91,10 @@ class TrajectoryView3D extends View3D {
                 this._visualLine.start = this._visualStart;
                 this._visualLine.end = this._visualStart;
                 this._visualLine.setVisibility(true);
+                this._drawLine = true;
+            }
+            else {
+                this._drawLine = false;
             }
         });