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-/*
-
-Copyright (c) Xerox Corporation 1998-2002. All rights reserved.
-
-Use and copying of this software and preparation of derivative works based
-upon this software are permitted. Any distribution of this software or
-derivative works must comply with all applicable United States export control
-laws.
-
-This software is made available AS IS, and Xerox Corporation makes no warranty
-about the software, its performance or its conformity to any specification.
-
-|<--- this code is formatted to fit into 80 columns --->|
-|<--- this code is formatted to fit into 80 columns --->|
-|<--- this code is formatted to fit into 80 columns --->|
-
-Ship.java
-Part of the Spacewar system.
-
-*/
-
-package spacewar;
-
-class Ship extends SpaceObject {
-
- pointcut helmCommandsCut(Ship ship):
- target(ship) && ( call(void rotate(int)) ||
- call(void thrust(boolean)) ||
- call(void fire()) );
-
-
- /**
- * Energy and Damage are key values in the state of a ship. Energy is
- * basically about fuel, and damage is about how bad a shape we are in.
- *
- * The energy related values are:
- * <ul>
- * <li>MAX_ENERGY</li>
- * <li>BULLET_ENERGY</li>
- * <li>ACCELERATION_ENERGY_FACTOR</li>
- * <li>energy</li>
- * </ul>
- * The damage related values are:
- * <ul>
- * <li>MAX_DAMAGE</li>
- * <li>BULLET_DAMAGE</li>
- * <li>COLLISION_DAMAGE_FACTOR</li>
- * <li>damage</li>
- * </ul>
- * Finally, REPAIR_RATE is the rate at which energy is consumed to fix
- * damage.
- *
- */
- private static final int MAX_ENERGY = 100;
- private static final int BULLET_ENERGY= 2;
- private static final double ACCELERATION_COST_FACTOR = 0.05;
-
- //XXX was private
- static final int MAX_DAMAGE = 100;
- private static final int BULLET_DAMAGE = 15;
- private static final double COLLISION_DAMAGE_FACTOR = 0.1;
-
- private static final double REPAIR_RATE = 0.08;
-
-
- private static final int EXPLOSION_LENGTH = 10;
-
- static final int BULLET_SPEED = 10;
-
- static final int CLOCKWISE = 1;
- static final int STOP = 0;
- static final int COUNTERCLOCKWISE = (-1);
-
- static final double DEFAULT_ANGULAR_VELOCITY = 0.2;
- static final double DEFAULT_ACCELERATION = .4;
-
- static private final int SIZE = 30; //Can't be changed for now!!!
-
- private double energy; // range: 0 to MAX_ENERGY
- private double damage; // range: 0 to MAX_DAMAGE
- private double orientation; // in degrees
- private double angularVel; // in ???
- private double xAcc, yAcc, rAcc; //
- private int countdown; // remaining explosion time
-
- private Pilot pilot;
-
- Ship(Game theGame, double xPos, double yPos, double orientation) {
- super(theGame, xPos, yPos, 0, 0);
- xAcc = 0;
- yAcc = 0;
- this.orientation = orientation;
- angularVel = 0;
-
- energy = MAX_ENERGY;
- damage = 0;
- countdown = EXPLOSION_LENGTH;
- }
-
-
- int getSize() { return SIZE; }
-
- double getEnergy() { return energy; }
- double getDamage() { return damage; }
- double getOrientation() { return orientation; }
- double getRAcc() { return rAcc; }
-
- Pilot getPilot() { return pilot; }
- void setPilot (Pilot p) { pilot = p; }
-
- float getEnergyLevel() {
- return (float)energy / (float)MAX_ENERGY;
- }
- float getDamageLevel() {
- return (float)damage / (float)MAX_DAMAGE;
- }
-
- /** returns false if energy is out, otherwise decrements energy by amount
- * and returns true
- */
- boolean expendEnergy(double amount) {
- if (amount <= energy) {
- energy -= amount;
- return true;
- }
- else
- return false;
- }
-
- /** increments damage by amount and handles the destruction of a ship if
- * damage reaches MAX_DAMAGE.
- */
- void inflictDamage(double amount) {
- if (amount < 0) // shouldn't happen
- return;
- damage = Math.min(MAX_DAMAGE, damage + amount);
- if (damage == MAX_DAMAGE)
- setIsAlive(false);
- }
-
- /** repairs some damage
- */
- void repairDamage(double amount) {
- if (amount < 0) // shouldn't happen
- return;
- if (damage == 0)
- return;
- damage = Math.max(0, damage - amount);
- }
-
- public void clockTick() {
- if (! isAlive()) {
- //
- // If we aren't alive, but we are still in the registry, it means
- // we are exploding. countdown counts the length of the explosion.
- //
- if (--countdown == 0)
- die();
- }
- else {
- if (angularVel != 0) {
- orientation += angularVel;
- xAcc = rAcc * Math.cos(orientation);
- yAcc = rAcc * Math.sin(orientation);
- }
- setXVel(getXVel() + xAcc);
- setYVel(getYVel() + yAcc);
-
- //expend energy
- if (!expendEnergy(rAcc * ACCELERATION_COST_FACTOR))
- rAcc = xAcc = yAcc = 0;
-
- // fix damage
- if (energy > 10 && damage > REPAIR_RATE) {
- expendEnergy(REPAIR_RATE);
- repairDamage(REPAIR_RATE);
- }
- }
- super.clockTick();
- }
-
- /**
- * First check to make sure we have enough energy to accelerate. If
- * we do, then go ahead and do so. Acceleration is in the direction
- * we are already facing (i.e. orientation).
- */
- void setAcceleration(double acc) {
- if (acc * ACCELERATION_COST_FACTOR <= energy) {
- rAcc = acc;
- xAcc = rAcc * Math.cos(orientation);
- yAcc = rAcc * Math.sin(orientation);
- }
- }
-
- /**
- * First check to make sure we have enough energy to rotate. If
- * we do, then go ahead and do so.
- */
- void setAngularVelocity(double omega) {
- // changing direction of rotation takes energy
- if (!expendEnergy(Math.abs(omega - angularVel) / 2))
- return;
- //sets amount of degree rotation per clock tick, in radians;
- //clockwise is positive
- angularVel = omega;
- }
-
- /** affect rotation thrusters. Direction can be one of {@link
- * #CLOCKWISE}, {@link #COUNTERCLOCKWISE}, or zero for turning off
- * the thrusters.
- */
- void rotate(int direction) {
- setAngularVelocity(
- direction == CLOCKWISE ? DEFAULT_ANGULAR_VELOCITY :
- direction == COUNTERCLOCKWISE ? -DEFAULT_ANGULAR_VELOCITY :
- 0);
- }
-
- /** turn on acceleration */
- void thrust(boolean onOff) {
- setAcceleration(onOff ? DEFAULT_ACCELERATION : 0);
- }
-
- /** create a bullet and fire it */
- void fire() {
- // firing a shot takes energy
- if (!expendEnergy(BULLET_ENERGY))
- return;
-
- //create a bullet object so it doesn't hit the ship that's firing it
- double xV = getXVel() + BULLET_SPEED * (Math.cos(orientation));
- double yV = getYVel() + BULLET_SPEED * (Math.sin(orientation));
-
- // create the actual bullet
- new Bullet(
- getGame(),
- (getXPos() + ((getSize()/2 + 2) * (Math.cos(orientation))) + xV),
- (getYPos() + ((getSize()/2 + 2) * (Math.sin(orientation))) + yV),
- xV,
- yV);
- }
-
-
- void handleCollision(SpaceObject obj) {
- if (obj instanceof Ship) {
- // should never be called. ship - ship collisions are handled in
- // Ship.bounce(Ship shipA, Ship shipB)
- }
- else if (obj instanceof Bullet) {
- inflictDamage(BULLET_DAMAGE);
- }
- else if (obj instanceof EnergyPacket) {
- double packetEnergy = ((EnergyPacket)obj).getEnergy();
- energy = Math.max(0, Math.min(energy + packetEnergy, MAX_ENERGY));
- }
- else {
- System.err.println("collision with UFO!");
- }
- }
-
- static void bounce(Ship shipA, Ship shipB) {
- double dx, dy, denominator,
- xAccA, yAccA, xAccB, yAccB, damage,
- xComp, yComp, dvx, dvy;
-
- dx = Math.abs(shipA.getXPos() - shipB.getXPos());
- dy = Math.abs(shipA.getYPos() - shipB.getYPos());
- denominator = Math.sqrt(dx * dx + dy * dy);
- xComp = dx / denominator;
- yComp = dy / denominator;
- xAccA = shipB.getXVel() * xComp + shipA.getXVel() * (1 - xComp) -
- shipA.getXVel();
- yAccA = shipB.getYVel() * yComp + shipA.getYVel() * (1 - yComp) -
- shipA.getYVel();
- xAccB = shipA.getXVel() * xComp + shipB.getXVel() * (1 - xComp) -
- shipB.getXVel();
- yAccB = shipA.getYVel() * yComp + shipB.getYVel() * (1 - yComp) -
- shipB.getYVel();
- shipA.accelerate(xAccA, yAccA);
- shipB.accelerate(xAccB, yAccB);
- dvx = shipA.getXVel() - shipB.getXVel();
- dvy = shipA.getYVel() - shipA.getYVel();
- damage = COLLISION_DAMAGE_FACTOR * (dvx * dvx + dvy * dvy);
- shipA.inflictDamage(damage);
- shipB.inflictDamage(damage);
-
- // !!!
- // !!! poopers! this does a local time warp. this has to be a
- // !!! violation of the clockTick protocol
- // !!!
- while (Game.isCollision(shipA, shipB)) {
- shipA.clockTick();
- shipB.clockTick();
- }
- }
-}
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