A. Setup

package wackadot ;

import fang.* ;

public class Wackadot extends GameLoop
{
    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

}

B. Making Dots

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }
}

C. Using the Mouse

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;
    private Sprite redDot ;
    private Sprite blueDot ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

    public void advanceFrame( double timePassed )
    {
        Point2D.Double mouse = getPlayer( ).getMouse( ).getLocation( ) ;
        dot.setLocation( mouse ) ;
    }
}

D. Adding more Dots

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;
    private Sprite redDot ;
    private Sprite blueDot ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;

        redDot = new OvalSprite( 1, 1 ) ;
        redDot.setScale( 0.1 ) ;
        redDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        redDot.setColor( Color.RED ) ;

        blueDot = new OvalSprite( 1, 1 ) ;
        blueDot.setScale( 0.1 ) ;
        blueDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        blueDot.setColor( Color.BLUE ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
        canvas.addSprite( redDot ) ;
        canvas.addSprite( blueDot ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

    public void advanceFrame( double timePassed )
    {
        Point2D.Double mouse = getPlayer( ).getMouse( ).getLocation( ) ;
        dot.setLocation( mouse ) ;
    }
}

E. Collision Handling

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;
    private Sprite redDot ;
    private Sprite blueDot ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;

        redDot = new OvalSprite( 1, 1 ) ;
        redDot.setScale( 0.1 ) ;
        redDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        redDot.setColor( Color.RED ) ;

        blueDot = new OvalSprite( 1, 1 ) ;
        blueDot.setScale( 0.1 ) ;
        blueDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        blueDot.setColor( Color.BLUE ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
        canvas.addSprite( redDot ) ;
        canvas.addSprite( blueDot ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

    private void repositionRandomly( Sprite sprite )
    {
        sprite.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
    }

    private void handleCollisions( )
    {
        if( dot.intersects( blueDot ) || dot.intersects( redDot ) )
        {
            long seed = (long)( 1000 * getTime( ) ) ;
            random.setSeed( seed ) ;
        }
        if( dot.intersects( blueDot ) )
        {
            repositionRandomly( blueDot ) ;
        }
        if( dot.intersects( redDot ) )
        {
            repositionRandomly( redDot ) ;
        }
    }

    public void advanceFrame( double timePassed )
    {
        Point2D.Double mouse = getPlayer( ).getMouse( ).getLocation( ) ;
        dot.setLocation( mouse ) ;
        handleCollisions( ) ;
    }
}

F. Switching Dot colors on collision

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;
    private Sprite redDot ;
    private Sprite blueDot ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;

        redDot = new OvalSprite( 1, 1 ) ;
        redDot.setScale( 0.1 ) ;
        redDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        redDot.setColor( Color.RED ) ;

        blueDot = new OvalSprite( 1, 1 ) ;
        blueDot.setScale( 0.1 ) ;
        blueDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        blueDot.setColor( Color.BLUE ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
        canvas.addSprite( redDot ) ;
        canvas.addSprite( blueDot ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

    private void repositionRandomly( Sprite sprite )
    {
        sprite.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
    }

    private void handleCollisions( )
    {
        if( dot.intersects( blueDot ) || dot.intersects( redDot ) )
        {
            long seed = (long)( 1000 * getTime( ) ) ;
            random.setSeed( seed ) ;
        }
        if( dot.intersects( blueDot ) )
        {
            repositionRandomly( blueDot ) ;
            if( dot.getColor( ).equals( Color.BLUE ) )
            {
                dot.setColor( Color.RED ) ;
            }
        }
        if( dot.intersects( redDot ) )
        {
            repositionRandomly( redDot ) ;
            if( dot.getColor( ).equals( Color.RED ) )
            {
                dot.setColor( Color.BLUE ) ;
            }
        }
    }

    public void advanceFrame( double timePassed )
    {
        Point2D.Double mouse = getPlayer( ).getMouse( ).getLocation( ) ;
        dot.setLocation( mouse ) ;
        handleCollisions( ) ;
    }
}

G. Keeping Score

package wackadot ;

import fang.* ;
import java.awt.Color ;
import java.awt.geom.* ;

public class Wackadot extends GameLoop
{
    private Sprite dot ;
    private Sprite redDot ;
    private Sprite blueDot ;

    private StringSprite scoreSprite ;
    private int score ;

    public void startGame( )
    {
        makeSprites( ) ;
        addSprites( ) ;
        score = 0 ;
    }

    private void makeSprites( )
    {
        dot = new OvalSprite( 1, 1 ) ;
        dot.setScale( 0.1 ) ;
        dot.setLocation( 0.5, 0.5 ) ;
        dot.setColor( Color.RED ) ;

        redDot = new OvalSprite( 1, 1 ) ;
        redDot.setScale( 0.1 ) ;
        redDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        redDot.setColor( Color.RED ) ;

        blueDot = new OvalSprite( 1, 1 ) ;
        blueDot.setScale( 0.1 ) ;
        blueDot.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
        blueDot.setColor( Color.BLUE ) ;

        scoreSprite = new StringSprite( "Score: " + score ) ;
        scoreSprite.setHeight( 0.1 ) ;
        scoreSprite.rightJustify( ) ;
        scoreSprite.topJustify( ) ;
        scoreSprite.setLocation( 1, 0 ) ;
    }

    private void addSprites( )
    {
        canvas.addSprite( dot ) ;
        canvas.addSprite( redDot ) ;
        canvas.addSprite( blueDot ) ;
        canvas.addSprite( scoreSprite ) ;
    }

    private void updateScore( )
    {
        scoreSprite.setText( "Score: " + score ) ;
    }

    public static void main( String[ ] argv )
    {
        Wackadot dot = new Wackadot( ) ;
        dot.runAsApplication( ) ;
    }

    private void repositionRandomly( Sprite sprite )
    {
        sprite.setLocation( random.nextDouble( ), random.nextDouble( ) ) ;
    }

    private void handleCollisions( )
    {
        if( dot.intersects( blueDot ) || dot.intersects( redDot ) )
        {
            long seed = (long)( 1000 * getTime( ) ) ;
            random.setSeed( seed ) ;
        }
        if( dot.intersects( blueDot ) )
        {
            repositionRandomly( blueDot ) ;
            if( dot.getColor( ).equals( Color.BLUE ) )
            {
                dot.setColor( Color.RED ) ;
                score++ ;
            }
            else
            {
                score-- ;
            }
            updateScore( ) ;
        }
        if( dot.intersects( redDot ) )
        {
            repositionRandomly( redDot ) ;
            if( dot.getColor( ).equals( Color.RED ) )
            {
                dot.setColor( Color.BLUE ) ;
                score++ ;
            }
            else
            {
                score-- ;
            }
            updateScore( ) ;
        }
    }

    public void advanceFrame( double timePassed )
    {
        Point2D.Double mouse = getPlayer( ).getMouse( ).getLocation( ) ;
        dot.setLocation( mouse ) ;
        handleCollisions( ) ;
    }
}