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33 package jmetest.flagrushtut.lesson7.actions;
35 import jmetest.flagrushtut.lesson7.Vehicle;
37 import com.jme.input.action.InputActionEvent;
38 import com.jme.input.action.KeyInputAction;
39 import com.jme.math.Matrix3f;
40 import com.jme.math.Vector3f;
43 * VehicleRotateLeftAction turns the vehicle to the left (while
48 public class VehicleRotateAction extends KeyInputAction {
49 public static final int RIGHT = 0;
50 public static final int LEFT = 1;
51 //temporary variables to handle rotation
52 private static final Matrix3f incr = new Matrix3f();
53 private static final Matrix3f tempMa = new Matrix3f();
54 private static final Matrix3f tempMb = new Matrix3f();
56 //we are using +Y as our up
57 private Vector3f upAxis = new Vector3f(0,1,0);
58 //the node to manipulate
59 private Vehicle vehicle;
60 private int direction;
61 private int modifier = 1;
64 * create a new action with the vehicle to turn.
65 * @param vehicle the vehicle to turn
67 public VehicleRotateAction(Vehicle vehicle, int direction) {
68 this.vehicle = vehicle;
69 this.direction = direction;
73 * turn the vehicle by its turning speed. If the vehicle is traveling
74 * backwards, swap direction.
76 public void performAction(InputActionEvent evt) {
77 //affect the direction
78 if(direction == LEFT) {
80 } else if(direction == RIGHT) {
83 //we want to turn differently depending on which direction we are traveling in.
84 if(vehicle.getVelocity() < 0) {
85 incr.fromAngleNormalAxis(-modifier * vehicle.getTurnSpeed() * evt.getTime(), upAxis);
87 incr.fromAngleNormalAxis(modifier * vehicle.getTurnSpeed() * evt.getTime(), upAxis);
89 vehicle.getLocalRotation().fromRotationMatrix(
90 incr.mult(vehicle.getLocalRotation().toRotationMatrix(tempMa),
92 vehicle.getLocalRotation().normalize();