Target.java~

// --------------- imports ------------------------------
import wheelsunh.users.*;
import java.awt.Color;

/** 
 * Target.java:
 * 
 * Displays a simple archery target using multiple Wheels Shapes.
 * The entire target is built in a method, makeTarget.
 * 
 * makeTarget has position arguments.
 *
 * @author rdb and mlb
 */
public class Target 
{
    //---------------- instance variables ------------------------------
    // local "constant" variables define the locations of the inner
        //   circles relative to the level1 circle.
        int    level2X    = 15,  level2Y = 15;
        int    level3X    = 25,  level3Y = 25;
        int    level4X    = 30,  level4Y = 30;
        
        // local "constant" variables define the sizes of all circles
        int    level1Size  = 80;
        int    level2Size = 50; 
        int    level3Size = 30; 
        int    level4Size  = 20;
        
        // other local variables are used to references  Wheels objects
        // used to draw the target.
        Ellipse    level1;
        Ellipse    level2;
        Ellipse    level3;
        Ellipse    level4;
      
    // -----------------------------------------------------------------
    /** 
     * Constructor for the Target class.
     */
    public Target()
    {
           makeTarget( 0, 0 );
           
    } 
    ////////////////////////////////////////////////////////////////////
    public Target( int x, int y )
    {
        makeTarget( x, y );
    }
    ////////////////////////////////////////////////////////////////////
    // -----------------------------------------------------------------
    /**
     * setLocation( int x, int y ).
     *   change the location of the target; 
     *   need to invoke setLocation on  4 ellipses that compose target.
     * 
     * @param x int
     * @param y int
     * 
     */
    public void setLocation( int x, int y )
    {
        /////////////////////////////////////////////////////////
        level1.setLocation( x, y );
        level2.setLocation( x + level2X, y + level2Y);
        level3.setLocation( x + level3X, y + level3Y);
        level4.setLocation( x + level4X, y + level4Y);
        ////////////////////////////////////////////////////////
    }
    
    // -----------------------------------------------------------------
    /**
     * move( int dx, int dy ).
     *   move the location of the target by dx and dy
     *     newx = oldx + dx 
     *     newy = oldy + dy
     *   use Target's setLocation method to actually change the location
     * 
     * @param dx int
     * @param dy int
     * 
     */
    public void move( int dx, int dy )
    {
        /////////////////////////////////////////////////////////
        int x = level1.getXLocation();
        int y = level1.getYLocation();
        
        setLocation( x + dx, y + dy );
        
        
        ////////////////////////////////////////////////////////
    }
    
    // -----------------------------------------------------------------
    /**
     * makeTarget.
     * encapsulates all the Wheels components needed to draw a target.
     * 
     * @param x int
     * @param y int
     */
    public void makeTarget( int x, int y )
    {
        // create the level1 circle
        level1 = new Ellipse( x, y );
        level1.setSize( level1Size, level1Size );
        
        // create the next level4 circle
        level2 = new Ellipse( x + level2X, y + level2Y );
        level2.setSize( level2Size, level2Size );
        level2.setColor( Color.BLUE );
        
        // create the next level4 circle
        level3 = new Ellipse( x + level3X, y + level3Y );
        level3.setSize( level3Size, level3Size );
        level3.setColor( Color.CYAN );
        
        // create the level4 circle
        level4 = new Ellipse( x + level4X, y + level4Y );
        level4.setColor( Color.BLACK );
        level4.setSize( level4Size, level4Size );
    }
    
    // -----------------------------------------------------------------
    /** main program just invokes the class constructor.
      * 
      * @param args String
      * 
      */
    public static void main( String[] args )
    {
        Frame f = new Frame();
        Target t1 = new Target();
        
        ////////////////////////////////////////////////////////////////
        Target t2 = new Target( 120, 100 );
        Target t3 = new Target( 200, 180 );
        Utilities.sleep( 1000 );
        t2.setLocation( 400, 400 );
        Utilities.sleep( 1000 );
        t3.move( 10, 10 );
        Utilities.sleep( 500 );
        t3.move( 20, 20 );
        Utilities.sleep( 500 );
        t3.move( 30, 30 );
        Utilities.sleep( 500 );
        t3.move( 40, 40 );
        
    }

} //End of Class Target