ship.java

java编程的一些Applets例子。值得深入研究一下。

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// $Id: Ship.java,v 1.3 1996/04/16 20:55:23 greg Exp $

import java.lang.*;
import java.awt.*;
import java.util.*;

public class Ship extends Figure
{
    // A scaling factor for the ship shape.
    public static int size = 8;

    // The transformed ship
    public Figure transshape;

    // The shape of the exploded ship.
    static int bamsz = 10;
    static public int bamshape[][][] =
      {{{0,0},{bamsz,0}},{{0,0},{bamsz,bamsz}},
       {{0,0},{0,bamsz}}, {{0,0},{-bamsz,bamsz}},
       {{0,0},{-bamsz,0}},{{0,0},{-bamsz,-bamsz}},
       {{0,0},{0,-bamsz}},{{0,0},{bamsz,-bamsz}}};
    static Figure bam;
    static {
	bam = new Figure( bamshape );
    }

    // The untransformed shape of the ship.
    static public int shipshape[][][] =
        {{{size,0},{-size,size}},{{-size,size},{-size,-size}},
				  {{-size,-size},{size,0}}};

    // The untransformed shape of the afterburner.
    static public int afterburner[][][] = {{{-size,(size*3)/4},{-size*2,0}},
					   {{-size,-(size*3)/4},{-size*2,0}}};

    Ship() {
	super( shipshape );
    }

    // Render the ship; render the afterburner and shield if they're on,
    // and render the explosion instead if the ship has exploded.
    public void render( int ox, int oy, double angle, Graphics g,
		       boolean engine, boolean exploded, boolean shield ) {
	if (exploded) {
	    transshape = bam.transform( ox, oy, angle );
	    transshape.render( g );
	} else {
	    g.setColor( Color.green );
	    transshape = transform( ox, oy, angle );
	    transshape.render( g );
	    if (engine) {
		g.setColor( Color.yellow );
		(new Figure( afterburner )).transform( ox, oy, angle )
                                           .render( g );
	    }
	    if (shield) {
		g.setColor( Color.green );
		g.drawOval( ox-(size*4)/2, oy-(size*4)/2, size*4, size*4 );
	    }
	}
    }

    // Intersection is with the transformed shape.
    public boolean intersectLines( int b[][] ) {
	if (transshape != null)
	  return transshape.intersectLines( b );
	else return false;
    }
}