Class Units

java.lang.Object
  |
  +--Units

class Units

extends java.lang.Object

The Units clas is a catch-all for holding a lot of the spatial size, temporal duration, and speed constants used in the Asteroids program. These statics could just as well live in the individual classes, but since they interact with each other, it's more perspicacious to have them in one spot. All the times are specified in seconds. The size units are arbitrary, we generally state them in terms of SIZE_WORLD, which is the diameter of the world where the asteroids live. A speed of k * SIZE_WORLD means that the object travels k* SIZE_WORLD in one second, and that the object takes 1/k seconds to travel all the way across the world. Thus a speed of 0.25 * SIZE_WORLD means the object travels a quarter wau across in one second, and takes four seconds to travel all the way across.

Field Summary

(package private) static double	ACCELERATION_ASTEROID_DART Acceleration used by asteroid to avoid the nearest bullet.
(package private) static double	ACCELERATION_ASTEROID_TOSHIP Acceleration towards the ship.
(package private) static double	ACCELERATION_THRUST Acceleration in world widths per second per second.
(package private) static double	DARTING_SPEEDUP Factor by which a darting asteroid is allowed to exceed its normal maxspeed.
(package private) static double	FIRE_WAIT_SHIP Seconds between bullet shots, so the bullets aren't too close together.
(package private) static double	FIRE_WAIT_UFO Seconds between missile shots, so the missles aren't too often.
(package private) static double	HEIGHT_WORLD The height of the unchanging real world in which the Asteroids move, the document size, rather than the view size.
(package private) static double	HYPER_WAIT_SHIP Number of seconds that a ship is immune while doing a hyperjump.
(package private) static double	LIFETIME_BULLET life in seconds.
(package private) static double	LIFETIME_EXPLOSION Number of seconds that explosion lines live.
(package private) static double	LIFETIME_MISSILE Missile lives long enough to cross the screen once.
(package private) static double	LIFETIME_UFO Seconds that a UFO lives
(package private) static double	MAX_SIZE_ASTEROID Max size of asteroid side in world units.
(package private) static double	MAX_SPEED_ASTEROID
(package private) static double	MAX_SPEED_BULLET Let Bullet go faster than the ship can go.
(package private) static double	MAX_SPEED_SHIP Ship's maximum speed.
(package private) static double	MAX_SPEED_SPRITE Default Sprite maxspeed, crosses world in 1.2 seconds.
(package private) static double	MAX_TURN_SPEED_ASTEROID Max speed of asteroid rotation, in radians per second.
(package private) static double	MAX_TURN_SPEED_EXPLOSION Max speed of explosion rotation.
(package private) static double	MIN_SIZE_ASTEROID
(package private) static double	MIN_SPEED_ASTEROID Min speed of asteroid motion in world units per update.
(package private) static double	MIN_SPEED_UFO Min speed of Ufo motion in units per update.
(package private) static double	RADIUS_WORLD Useful for disk wrap.
(package private) static double	SIZE_WORLD The minimum cross diameter of the world.
(package private) static double	SPEED_BULLET Bullet speed in worlds per second.
(package private) static double	SPEED_INCREMENT_ASTEROIDS Increment to the maxspeed (short of MAX_SPEED_ASTEROID) to be used when starting a new board.
(package private) static double	SPEED_MISSILE Speed the missile uses to pursue a ship.
(package private) static double	SPEED_MULTIPLIER_EXPLOSION Multiply this times a shape vertex's distance from the origin to get the outward speed of an explosion fragment.
(package private) static double	START_MAX_SPEED_UFO Speed in world units per second.
(package private) static double	STORM_PAUSE Number of updates to pause after an old wave of asteroids before a new one.
(package private) static double	TIMEUNIT Seconds between screen updates.
(package private) static double	TURN_STEP_FAST_SHIP See TURN_STEP_SLOW.
(package private) static double	TURN_STEP_SLOW_SHIP Size of ship's rotation speed when you hold down the arrow key.
(package private) static double	WIDTH_WORLD The width of the unchanging real world in which the Asteroids move, the document size, rather than the view size.

Constructor Summary

(package private)

Units()

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

TIMEUNIT

static final double TIMEUNIT

Seconds between screen updates. Used in the Asteroids main function's update as part of an argument to a wait call. We have 0.04, which means we try for 25 updates a second. I still need to look into exactly how to handle the case when the processor can't go this fast.

WIDTH_WORLD

static final double WIDTH_WORLD

The width of the unchanging real world in which the Asteroids move, the document size, rather than the view size. Used in Asteroids.

HEIGHT_WORLD

static final double HEIGHT_WORLD

The height of the unchanging real world in which the Asteroids move, the document size, rather than the view size. Used in Asteroids.

SIZE_WORLD

static final double SIZE_WORLD

The minimum cross diameter of the world. Used for the rest of the Unit definitions.

RADIUS_WORLD

static final double RADIUS_WORLD

Useful for disk wrap.

STORM_PAUSE

static final double STORM_PAUSE

Number of updates to pause after an old wave of asteroids before a new one. Was 30.

MAX_SPEED_SPRITE

static final double MAX_SPEED_SPRITE

Default Sprite maxspeed, crosses world in 1.2 seconds.

MIN_SPEED_ASTEROID

static final double MIN_SPEED_ASTEROID

Min speed of asteroid motion in world units per update. 0.1

MAX_SPEED_ASTEROID

static final double MAX_SPEED_ASTEROID

SPEED_INCREMENT_ASTEROIDS

static final double SPEED_INCREMENT_ASTEROIDS

Increment to the maxspeed (short of MAX_SPEED_ASTEROID) to be used when starting a new board.

MIN_SIZE_ASTEROID

static final double MIN_SIZE_ASTEROID

MAX_SIZE_ASTEROID

static final double MAX_SIZE_ASTEROID

Max size of asteroid side in world units.

MAX_TURN_SPEED_ASTEROID

static final double MAX_TURN_SPEED_ASTEROID

Max speed of asteroid rotation, in radians per second.

ACCELERATION_ASTEROID_DART

static final double ACCELERATION_ASTEROID_DART

Acceleration used by asteroid to avoid the nearest bullet.

DARTING_SPEEDUP

static final double DARTING_SPEEDUP

Factor by which a darting asteroid is allowed to exceed its normal maxspeed.

ACCELERATION_ASTEROID_TOSHIP

static final double ACCELERATION_ASTEROID_TOSHIP

Acceleration towards the ship.

MIN_SPEED_UFO

static final double MIN_SPEED_UFO

Min speed of Ufo motion in units per update. Was 3.

START_MAX_SPEED_UFO

static final double START_MAX_SPEED_UFO

Speed in world units per second.

LIFETIME_UFO

static final double LIFETIME_UFO

Seconds that a UFO lives

FIRE_WAIT_UFO

static final double FIRE_WAIT_UFO

Seconds between missile shots, so the missles aren't too often.

MAX_SPEED_SHIP

static final double MAX_SPEED_SHIP

Ship's maximum speed.

HYPER_WAIT_SHIP

static final double HYPER_WAIT_SHIP

Number of seconds that a ship is immune while doing a hyperjump.

FIRE_WAIT_SHIP

static final double FIRE_WAIT_SHIP

Seconds between bullet shots, so the bullets aren't too close together.

TURN_STEP_SLOW_SHIP

static final double TURN_STEP_SLOW_SHIP

Size of ship's rotation speed when you hold down the arrow key. Needs to be small so you can aim accurately enough to hit a missile, on the other hand it needs to be large so you can spin and fire off a big sweep of bullets. So we have two kinds of TURN_STEP. Speed is radians per second. 0.6

TURN_STEP_FAST_SHIP

static final double TURN_STEP_FAST_SHIP

See TURN_STEP_SLOW. Radians per second. 1.2

ACCELERATION_THRUST

static final double ACCELERATION_THRUST

Acceleration in world widths per second per second. 1.0

SPEED_MISSILE

static final double SPEED_MISSILE

Speed the missile uses to pursue a ship. Worlds per second. 0.27.

LIFETIME_MISSILE

static final double LIFETIME_MISSILE

Missile lives long enough to cross the screen once.

SPEED_MULTIPLIER_EXPLOSION

static final double SPEED_MULTIPLIER_EXPLOSION

Multiply this times a shape vertex's distance from the origin to get the outward speed of an explosion fragment. 4.0

MAX_TURN_SPEED_EXPLOSION

static final double MAX_TURN_SPEED_EXPLOSION

Max speed of explosion rotation. Radians per second. 1.3

LIFETIME_EXPLOSION

static final double LIFETIME_EXPLOSION

Number of seconds that explosion lines live. 1.5

MAX_SPEED_BULLET

static final double MAX_SPEED_BULLET

Let Bullet go faster than the ship can go.

SPEED_BULLET

static final double SPEED_BULLET

Bullet speed in worlds per second. 0.8

LIFETIME_BULLET

static final double LIFETIME_BULLET

life in seconds. Make sure it lives long enough to reach the edge of the screen. 2.0

Constructor Detail

Units

Units()