Added a method to disable limits in CameraHandler and an optional second

swing axis to SwingPath.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3902 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/jme/camera/CameraHandler.java

@@ -98,6 +98,14 @@ public class CameraHandler
         _maxZ = maxZ;
     }
 
+    /**
+     * Enables or disables the current set of limits.
+     */
+    public void setLimitsEnabled (boolean enabled)
+    {
+        _limitsEnabled = enabled;
+    }
+    
     /**
      * Sets the camera zoom level to a value between zero (zoomed in maximally)
      * and 1 (zoomed out maximally). Zoom limits must have already been set up
@@ -301,6 +309,9 @@ public class CameraHandler
 
     protected Vector3f bound (Vector3f loc)
     {
+        if (!_limitsEnabled) {
+            return loc;
+        }
         if (_boundViaFrustum) {
             bound(_camera.getFrustumLeft(), _camera.getFrustumTop(), loc);
             bound(_camera.getFrustumLeft(), _camera.getFrustumBottom(), loc);
@@ -368,7 +379,7 @@ public class CameraHandler
     protected Matrix3f _rotm = new Matrix3f();
     protected Vector3f _temp = new Vector3f();
 
-    protected boolean _boundViaFrustum;
+    protected boolean _boundViaFrustum, _limitsEnabled = true;
     protected float _minX = -Float.MAX_VALUE, _maxX = Float.MAX_VALUE;
     protected float _minY = -Float.MAX_VALUE, _maxY = Float.MAX_VALUE;
     protected float _minZ = -Float.MAX_VALUE, _maxZ = Float.MAX_VALUE;

src/java/com/threerings/jme/camera/SwingPath.java

@@ -22,6 +22,7 @@
 package com.threerings.jme.camera;
 
 import com.jme.math.FastMath;
+import com.jme.math.Quaternion;
 import com.jme.math.Vector3f;
 import com.jme.renderer.Camera;
 
@@ -49,28 +50,55 @@ public class SwingPath extends CameraPath
      */
     public SwingPath (CameraHandler camhand, Vector3f spot, Vector3f axis,
                       float angle, float angvel, float zoom)
+    {
+        this(camhand, spot, axis, angle, angvel, null, 0f, zoom);
+    }
+    
+    /**
+     * Creates a rotating, zooming path for the specified camera.
+     *
+     * @param spot the point of interest around which to swing the camera.
+     * @param paxis the primary axis around which to rotate the camera.
+     * @param pangle the angle through which to rotate the camera about the
+     * primary axis.
+     * @param angvel the (absolute value of the) velocity at which to rotate
+     * the camera (in radians per second) about the primary angle.
+     * @param saxis the secondary axis around which to rotate the camera, or
+     * <code>null</code> for none
+     * @param sangle the angle through which to rotate the camera about the
+     * secondary axis
+     * @param zoom the distance to zoom along the camera's view axis (negative
+     * = in, positive = out).
+     */
+    public SwingPath (CameraHandler camhand, Vector3f spot, Vector3f paxis,
+                      float pangle, float angvel, Vector3f saxis, float sangle,
+                      float zoom)
     {
         super(camhand);
 
-        if (angle == 0) {
+        if (pangle == 0) {
             Log.warning("Requested to swing camera through zero degrees " +
-                        "[spot=" + spot + ", axis=" + axis +
+                        "[spot=" + spot + ", paxis=" + paxis +
                         ", angvel=" + angvel + ", zoom=" + zoom + "].");
-            angle = 0.0001f;
+            pangle = 0.0001f;
         }
         if (angvel <= 0) {
             Log.warning("Requested to swing camera with invalid velocity " +
-                        "[spot=" + spot + ", axis=" + axis + ", angle=" + angle +
-                        ", angvel=" + angvel + ", zoom=" + zoom + "].");
+                        "[spot=" + spot + ", paxis=" + paxis + ", pangle=" +
+                        pangle + ", angvel=" + angvel + ", zoom=" + zoom +
+                        "].");
             angvel = FastMath.PI;
         }
 
         _spot = spot;
-        _axis = axis;
-        _angle = angle;
-        _angvel = (angle > 0) ? angvel : -1 * angvel;
+        _paxis = paxis;
+        _pangle = pangle;
+        _pangvel = (pangle > 0) ? angvel : -1 * angvel;
+        _saxis = (saxis == null) ? null : new Vector3f(saxis);
+        _sangle = sangle;
+        _sangvel = _sangle * _pangvel / _pangle;
         _zoom = zoom;
-        _zoomvel = _zoom * _angvel / _angle;
+        _zoomvel = _zoom * _pangvel / _pangle;
 
 //         Log.info("Swinging camera [angle=" + _angle + ", angvel=" + _angvel +
 //                  ", zoom=" + _zoom + ", zoomvel=" + _zoomvel + "].");
@@ -79,30 +107,41 @@ public class SwingPath extends CameraPath
     // documentation inherited
     public boolean tick (float secondsSince)
     {
-        float deltaAngle = (secondsSince * _angvel);
+        float deltaPAngle = (secondsSince * _pangvel);
+        float deltaSAngle = (secondsSince * _sangvel);
         float deltaZoom = (secondsSince * _zoomvel);
-        _rotated += deltaAngle;
+        _protated += deltaPAngle;
+        _srotated += deltaSAngle;
         _zoomed += deltaZoom;
 
         // clamp our rotation at the target angle and determine whether or not
         // we're done
         boolean done = false;
-        if (_angle > 0 && _rotated > _angle ||
-            _angle < 0 && _rotated < _angle) {
-            deltaAngle -= (_rotated - _angle);
+        if (_pangle > 0 && _protated > _pangle ||
+            _pangle < 0 && _protated < _pangle) {
+            deltaPAngle -= (_protated - _pangle);
+            deltaSAngle -= (_srotated - _sangle);
             deltaZoom -= (_zoomed - _zoom);
-            _rotated = _angle;
+            _protated = _pangle;
+            _srotated = _sangle;
             _zoomed = _zoom;
             done = true;
         }
 
         // have the camera handler do the necessary rotating and zooming
-        _camhand.rotateCamera(_spot, _axis, deltaAngle, deltaZoom);
-
+        _camhand.rotateCamera(_spot, _paxis, deltaPAngle, deltaZoom);
+        if (_saxis != null) {
+            _rot.fromAngleAxis(deltaPAngle, _paxis).multLocal(_saxis);
+            _camhand.rotateCamera(_spot, _saxis, deltaSAngle, 0f);
+        }
+            
         return done;
     }
 
-    protected Vector3f _spot, _axis;
-    protected float _angle, _angvel, _rotated;
+    protected Vector3f _spot, _paxis, _saxis;
+    protected float _pangle, _pangvel, _protated;
+    protected float _sangle, _sangvel, _srotated;
     protected float _zoom, _zoomvel, _zoomed;
+    
+    protected Quaternion _rot = new Quaternion();
 }