feat: add interaction showcase

Author: typpo

build/spacekit.cjs.js

@@ -11,14 +11,13 @@ export default class Camera {
     private context;
     private camera;
     private cameraControls;
-    private followMesh?;
+    private followTarget?;
     /**
      * @param {Object} context The simulation context
      */
     constructor(context: SimulationContext);
     /**
-     * Move the camera to follow a SpaceObject as it moves. Currently only works
-     * for non-particlesystems.
+     * Move the camera to follow a SpaceObject as it moves.
      * @param {SpaceObject} obj SpaceObject to follow.
      * @param {Array.<Number>} position Position of the camera with respect to
      * the object.

build/spacekit.cjs.js.map

@@ -37,8 +37,8 @@ var Camera = /** @class */ (function () {
     function Camera(context) {
         // TODO(ian): Accept either context or container
         this.context = context;
-        // Optional mesh that we are following.
-        this.followMesh = undefined;
+        // Optional object that we are following.
+        this.followTarget = undefined;
         var containerWidth = this.context.container.width;
         var containerHeight = this.context.container.height;
         var camera = new THREE.PerspectiveCamera(50, containerWidth / containerHeight, (0, Scale_1.rescaleNumber)(0.00001), (0, Scale_1.rescaleNumber)(2000));
@@ -67,35 +67,32 @@ var Camera = /** @class */ (function () {
         this.cameraControls = controls;
     }
     /**
-     * Move the camera to follow a SpaceObject as it moves. Currently only works
-     * for non-particlesystems.
+     * Move the camera to follow a SpaceObject as it moves.
      * @param {SpaceObject} obj SpaceObject to follow.
      * @param {Array.<Number>} position Position of the camera with respect to
      * the object.
      */
     Camera.prototype.followObject = function (obj, position) {
-        var followMesh = obj.get3jsObjects()[0];
         this.cameraControls.enablePan = false;
         var rescaled = (0, Scale_1.rescaleArray)(position);
         this.camera.position.add(new THREE.Vector3(rescaled[0], rescaled[1], rescaled[2]));
         this.cameraControls.update();
-        this.followMesh = followMesh;
+        this.followTarget = obj;
     };
     /**
      * Stop the camera from following the object.
      */
     Camera.prototype.stopFollowingObject = function () {
-        if (this.followMesh) {
-            this.followMesh.remove(this.camera);
-            this.followMesh = undefined;
+        if (this.followTarget) {
+            this.followTarget = undefined;
             this.cameraControls.enablePan = true;
         }
     };
     /**
      * @returns {boolean} True if camera is following object.
      */
     Camera.prototype.isFollowingObject = function () {
-        return !!this.followMesh;
+        return !!this.followTarget;
     };
     /**
      * @returns {THREE.PerspectiveCamera} The THREE.js camera object.
@@ -114,7 +111,8 @@ var Camera = /** @class */ (function () {
      */
     Camera.prototype.update = function () {
         if (this.isFollowingObject()) {
-            var newpos = this.followMesh.position.clone();
+            var _a = this.followTarget.getPosition(this.context.simulation.getJd()), x = _a[0], y = _a[1], z = _a[2];
+            var newpos = new THREE.Vector3(x, y, z);
             var offset = newpos.clone().sub(this.cameraControls.target);
             this.camera.position.add(offset);
             this.cameraControls.target.set(newpos.x, newpos.y, newpos.z);

build/spacekit.esm.js

@@ -42,7 +42,7 @@ var Coordinates = /** @class */ (function () {
     Coordinates.getNutationAndObliquity = function (jd) {
         if (jd === void 0) { jd = J2000; }
         var t = (jd - J2000) / 36525;
-        var omega = Units_1["default"].rad(125.04452 - 1934.136261 * t + 0.0020708 * t * t + (t * t + t) / 450000);
+        var omega = Units_1["default"].rad(125.04452 - 1934.136261 * t + 0.0020708 * t * t + (t * t * t) / 450000);
         var Lsun = Units_1["default"].rad(280.4665 + 36000.7698 * t);
         var Lmoon = Units_1["default"].rad(218.3165 + 481267.8813 * t);
         var nutation = (-17.2 / 3600) * Math.sin(omega) -

build/spacekit.esm.js.map

@@ -217,16 +217,16 @@ var Ephem = /** @class */ (function () {
         var n = this.getUnsafe('n');
         var GM = this.getUnsafe('GM');
         var period = this.getUnsafe('period');
-        if (!isDef(period) && isDef(a)) {
-            if (!isDef(GM)) {
-                throw new Error('Expected ephemeris attribute GM to be set');
-            }
-            period =
-                (2 * Math.PI * Math.sqrt((aMeters * aMeters * aMeters) / GM)) /
-                    SECONDS_IN_DAY;
-            this.set('period', period);
-        }
         if (e < 1.0) {
+            if (!isDef(period) && isDef(a)) {
+                if (!isDef(GM)) {
+                    throw new Error('Expected ephemeris attribute GM to be set');
+                }
+                period =
+                    (2 * Math.PI * Math.sqrt((aMeters * aMeters * aMeters) / GM)) /
+                        SECONDS_IN_DAY;
+                this.set('period', period);
+            }
             // Only work with mean motion for elliptical orbits.
             if (isDef(period) && !isDef(n)) {
                 // Set radians