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Diffstat (limited to 'docs/modules/ROOT/pages/examples/spacewar/Robot.java')
| -rw-r--r-- | docs/modules/ROOT/pages/examples/spacewar/Robot.java | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/docs/modules/ROOT/pages/examples/spacewar/Robot.java b/docs/modules/ROOT/pages/examples/spacewar/Robot.java deleted file mode 100644 index 05f276108..000000000 --- a/docs/modules/ROOT/pages/examples/spacewar/Robot.java +++ /dev/null @@ -1,201 +0,0 @@ -/* - -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 --->| - - -Robot.java -Part of the Spacewar system. - -*/ - -package spacewar; - -import java.util.Random; - -/** - * Robot is an automatic pilot that now has quite a bit of intelligence. - * So, beware ! - */ -class Robot extends Pilot implements Runnable { - - private static final int FIRE_INTERVAL = 60; - private static final int REBIRTH_DELAY = 900; - - private final Random random = new Random(); - - private Thread runner; - private boolean runnable = true; - - Robot(Game theGame, int number) { - super(theGame, number); - } - - void start() { - if (runner == null) { - runner = new Thread(this); - runner.start(); - } - } - - void destroy() { - if (runner != null) { - runnable = false; - runner = null; - } - } - - - // A Robot tracks User-controlled ships and fires at them - public void run() { - Ship target = null; - - while(runnable) { - // find target ship - do { - Ship[] potentials = getGame().getRegistry().getShips(); - if(potentials.length != 0) - target = potentials[Math.abs(random.nextInt() % potentials.length)]; - sleepForABit(25); - } while (target == ship); - // main loop - int currentRotation = Ship.STOP; - int time; - boolean currentlyAccelerating = false; - double dx, dy, angleA, angleB, theta, dtheta, d, - targetVel, a, b, c, targetXVel, targetYVel; - - while(true) { - sleepForABit(FIRE_INTERVAL); - - // if my ship is destroyed, give me a new one - if (!ship.isAlive()) { - sleepForABit(REBIRTH_DELAY); - getGame().newShip(this); - } - - // find direction and distance from target to me - dx = ship.getXPos() - target.getXPos(); - if (dx < - getGame().getWidth() / 2) - dx += getGame().getWidth(); - if (dx > getGame().getWidth() / 2) - dx -= getGame().getWidth(); - dy = ship.getYPos() - target.getYPos(); - if (dy < - getGame().getHeight() / 2) - dy += getGame().getHeight(); - if (dy > getGame().getHeight() / 2) - dy -= getGame().getHeight(); - d = Math.sqrt(dx * dx + dy * dy); - angleA = Math.atan(dy / dx); - if (dx < 0) - angleA += Math.PI; - - // find relative velocity and trajectory of target - targetXVel = target.getXVel() - ship.getXVel(); - targetYVel = target.getYVel() - ship.getYVel(); - targetVel = Math.sqrt(targetXVel * targetXVel + - targetYVel * targetYVel); - angleB = Math.atan(targetYVel / targetXVel); - if (targetXVel < 0) - angleB+=Math.PI; - - // find angle between line to target and taget's direction of travel - theta = (angleA - angleB) % (2 * Math.PI); - if (theta < -Math.PI) - theta += 2 * Math.PI; - if (theta > Math.PI) - theta -= 2 * Math.PI; - - // calculate time to bullet impact using law of cosines - a = targetVel * targetVel + Ship.BULLET_SPEED * Ship.BULLET_SPEED; - b = d * targetVel * Math.cos(theta); - c = - d * d; - time = (int)((-b + Math.sqrt(b * b - 4 * a * c)) / 2 / a); - - // calculate angle and distance to bullet impact location - dx = targetXVel * time - dx; - dy = targetYVel * time - dy; - theta = Math.atan(dy / dx); - if(dx < 0) - theta += Math.PI; - - // find desired change in rotation - dtheta = (theta - ship.getOrientation()) % (2 * Math.PI); - // find the shortest path to the desired orientation; - if(dtheta < - Math.PI) - dtheta += 2 * Math.PI; - if(dtheta > Math.PI) - dtheta -= 2 * Math.PI; - - // turn if nessecary - if (dtheta > Ship.DEFAULT_ANGULAR_VELOCITY / 2) { - if (currentRotation != Ship.CLOCKWISE) - ship.rotate(currentRotation = Ship.CLOCKWISE); - } - else if (dtheta < -Ship.DEFAULT_ANGULAR_VELOCITY / 2) { - if (currentRotation != Ship.COUNTERCLOCKWISE) - ship.rotate(currentRotation = Ship.COUNTERCLOCKWISE); - } // otherwise, fire, maybe even a burst - else { - if(currentRotation != Ship.STOP) - ship.rotate(currentRotation = Ship.STOP); - if (random.nextInt() % 40 == 0) { - ship.fire(); - } - } - - // randomly accelerate - if (currentlyAccelerating && random.nextInt() % 2 == 0) - ship.thrust(currentlyAccelerating = false); - else { - if (ship.getXVel() == 0) - angleA = 0; - else - angleA = Math.atan(ship.getYVel() / ship.getXVel()); - - if (ship.getXVel() < 0) - angleA+=Math.PI; - angleB = (angleA - ship.getOrientation()) % (2 * Math.PI); - if (angleB < -Math.PI) - angleB += 2 * Math.PI; - if (angleB > Math.PI) - angleB -= 2 * Math.PI; - angleB = Math.abs(angleB); - - // angleB now represents the angle between the ship's - // orientation and velocity vector. This will be used to - // determine the probably that the ship will thrust to - // prevent ships from accelerating too much in one direction - if (random.nextInt() % (int)(12 * (Math.PI - angleB) + 1) == 0) - ship.thrust(currentlyAccelerating = true); - } - - // switch targets if current one has been destroyed - if (target.getDamage() == 100) - break; - - // randomly switch targets - if (random.nextInt() % 4000 == 0) - break; - } - } - } - - void sleepForABit (int time) { - try { - runner.sleep(time); - } - catch (InterruptedException e) {} - } -} |