Package playground

Class SpaceInvadersLevel

java.lang.Object

playground.Playground

playground.SpaceInvadersLevel

Direct Known Subclasses:

Level1, Level2, Level3, Level4, Level5, Level6, Level7, LevelBoss, LevelHitTwice, LevelWithBox

public class SpaceInvadersLevel
extends Playground

Class that realizes all the game logic of a very simple game level. The level contains for now only two objects that are GameObject subclasses: FallingStar and EgoObject. Functions performed by this class are:

• initially set up the level, spawn all object etc., in method prepareLevel(java.lang.String)
• React to game events in actionIfEgoCollidesWithCollect(GameObject, GameObject) , actionIfEgoCollidesWithEnemy(GameObject, GameObject), etc.
• define basic object movement rules for all objects in the level in the various ObjectController subclasses: EgoController and FallingStarController.

Field Summary

Fields

Modifier and Type	Field	Description
static final double	EGOSPEED
static final double	SHOTSPEED

Fields inherited from class playground.Playground

FLAGS_ALL, FLAGS_GLOBAL, FLAGS_LEVEL

Constructor Summary

Constructors

Constructor	Description
SpaceInvadersLevel()

Method Summary

Modifier and Type	Method	Description
void	applyGameLogic()	applies the logic of the level: For now, this is just about deleting shots that are leaving the screen and calling methods 'actionIf..' in case objects collide.
boolean	gameOver()
boolean	levelFinished()
int	preferredSizeX()	calculates and returns the preferred size of the level (in pixel) for X-direction
int	preferredSizeY()	calculates and returns the preferred size of the level (in pixel) for Y-direction
void	prepareLevel(String id)	initially sets up the level.
void	redrawLevel(Graphics2D g2)	(re)draws the level but NOT the objects, they draw themselves.

Methods inherited from class playground.Playground

addObject, addObjectNow, collectObjects, deleteObject, deleteObjectNow, getGameTime, getGlobalFlag, getKeyEvents, getLevelFlag, getMouseEvents, getObject, getOrCreateGlobalFlag, getOrCreateLevelFlag, getSizeX, getSizeY, getTimestep, isPaused, processKeyEvents, processMouseEvents, redraw, reset, resetFlags, setGameTime, setGlobalFlag, setLevelFlag, setPaused, setTimestep, togglePause, updateObjects

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SHOTSPEED

public static final double SHOTSPEED

See Also:

• Constant Field Values

EGOSPEED

public static final double EGOSPEED

See Also:

• Constant Field Values

Constructor Details

SpaceInvadersLevel

public SpaceInvadersLevel()

Method Details

prepareLevel

public void prepareLevel(String id)

initially sets up the level. Not called by user interaction, but called every time a layer is restarted from scratch. So make sure that this is possible. Here, resources are loaded only once even if method is called several times.

Specified by:

prepareLevel in class Playground

Parameters:

id - String identifies level.

redrawLevel

public void redrawLevel(Graphics2D g2)

(re)draws the level but NOT the objects, they draw themselves. Called by the main game loop. This method mainly draws the background and the scoreboard.

Specified by:

redrawLevel in class Playground

Parameters:

g2 - Graphics2D object that can, and should be, draw on.

applyGameLogic

public void applyGameLogic()

applies the logic of the level: For now, this is just about deleting shots that are leaving the screen and calling methods 'actionIf..' in case objects collide.

Specified by:

applyGameLogic in class Playground

gameOver

public boolean gameOver()

Specified by:

gameOver in class Playground

levelFinished

public boolean levelFinished()

Specified by:

levelFinished in class Playground

preferredSizeX

public int preferredSizeX()

calculates and returns the preferred size of the level (in pixel) for X-direction

Specified by:

preferredSizeX in class Playground

preferredSizeY

public int preferredSizeY()

calculates and returns the preferred size of the level (in pixel) for Y-direction

Specified by:

preferredSizeY in class Playground