<![CDATA[// Code by Sergio Fanchiotti (c) 1997
//
// Free to use and copy for any purpose.
//
// No responsability for any mis-use or problems
// due to the usage of this code on any device.
// (i.e. crashing your browser and/or your OS)
//
import java.awt.*;
import java.applet.*;
import java.util.*;
public class UFO_Attack extends Applet implements Runnable {
Image buffer = null ; // Temporary image buffer
Image backdrop = null ; // Backdrop image
Image bgimg = null ; // Original backdrop image
Image ufostrip = null ; // UFO Sequence
Image missile = null ; // Misile Sequence
Image missile_explosion
= null ; // Misile Esplosion Sequence
MediaTracker tracker = null ;
Graphics buf_g = null ; // Buffer graphics object
Graphics bkd_g = null ; // Backdrop graphics object
Dimension window_size = null;
Font font ;
Font font_s ;
AudioClip explosion = null ;
AudioClip newufo = null ;
AudioClip missile_launch = null ;
Thread game = null ;
boolean game_over = true ;
int mouse_x = 100 ;
Rectangle paint_area = new Rectangle() ;
Rectangle new_area = new Rectangle() ;
Launcher L = null ;
Missile M = null ;
Vector UV = new Vector() ;
Vector EV = new Vector() ;
int NU = 1 ;
int score = 0 ;
// Colors
Color gunColor;
Color mColor;
Color ufoColor;
Color scoreColor;
Color bgColor;
public void init() {
System.out.println("UFO Attack: A game by Sergio Fanchiotti") ;
tracker = new MediaTracker(this) ;
bgimg = getImage(this.getCodeBase(),"bgimg.gif") ;
tracker.addImage(bgimg,0) ;
ufostrip = getImage(this.getCodeBase(),"ufostrip.gif") ;
tracker.addImage(ufostrip,0) ;
missile = getImage(this.getCodeBase(),"missile.gif") ;
tracker.addImage(missile,0) ;
missile_explosion = getImage(this.getCodeBase(),"explosionstrip.gif") ;
tracker.addImage(missile_explosion,0) ;
font = new Font("Helvetica", Font.BOLD, 24) ;
font_s = new Font("Helvetica", Font.BOLD, 14) ;
// Define the colors to use
bgColor = new Color(0,0,128);
gunColor = new Color(0,88,0);
mColor = new Color(255,255,255);
ufoColor = new Color(255,0,0);
scoreColor = new Color(0,0,255);
}
public void start() {
// Change the cursor
getFrame(this).setCursor(Frame.CROSSHAIR_CURSOR) ;
window_size = size();
buffer = null;
buffer = createImage(window_size.width, window_size.height);
backdrop = null;
backdrop = createImage(window_size.width, window_size.height);
buf_g = buffer.getGraphics();
buf_g.setColor(bgColor);
buf_g.fillRect(0, 0, window_size.width, window_size.height);
// Display initial message
set_say_font(font) ;
set_say_mode(CENTER) ;
set_say_style(SHADOW) ;
say("UFO",10,80) ;
say("ATTACK") ;
set_say_font(font_s) ;
set_say_style(NORMAL) ;
say("") ;
say("Click to start") ;
say("a game") ;
//repaint() ;
Graphics g = getGraphics() ;
g.drawImage(buffer,0,0,this) ;
// Initialize the launcher
mouse_x = window_size.width/2 ;
L = new Launcher(this) ;
L.set_color(gunColor) ;
// Initialize the missile
M = new Missile(this) ;
M.set_color(mColor) ;
// Load the sound files now
if (explosion == null)
explosion = getAudioClip(getCodeBase(),"explosion.au") ;
if (newufo == null)
newufo = getAudioClip(getCodeBase(),"sonar.au") ;
if (missile_launch == null)
missile_launch = getAudioClip(getCodeBase(),"rocket.au") ;
game_over = true ;
newufo.play() ; // Play sounds
missile_launch.play() ;
explosion.play() ;
}
public void stop() {
// Stop the game if running
if (game != null) {
game.stop() ;
game = null ; // and eliminate the thread
}
// Reset the cursor
getFrame(this).setCursor(Frame.DEFAULT_CURSOR) ;
}
// The main game thread
public void run() {
// Define some local variables
UFO U ;
Explosion E ;
long count = 0 ;
long ti = 0 ;
// Wait for the images to load
Graphics g = getGraphics() ;
g.setColor(Color.red) ;
g.drawString("Starting Game...", 20,20) ;
while (tracker.checkAll(true) == false) {
if ((ti++ % 2) == 0)
g.setColor(Color.red) ;
else
g.setColor(Color.green) ;
g.drawString("*", 10,22) ;
try {Thread.sleep(50);} catch (InterruptedException e) { } ;
if (ti > 1000) break ;
}
if (tracker.isErrorAny()) {
showStatus("Error getting images") ;
return ;
}
showStatus("Loading completed") ;
g.dispose() ;
// Paint the backdrop buffer
buf_g = backdrop.getGraphics();
buf_g.drawImage(bgimg,0,0,window_size.width,window_size.height,this) ;
// Paint the screen
buf_g = getGraphics();
buf_g.drawImage(backdrop,0,0,this) ;
// Paing the buffer
buf_g = buffer.getGraphics();
buf_g.drawImage(bgimg,0,0,window_size.width,window_size.height,this) ;
// Display the buffer
repaint() ;
// Display the initial setup
display_score() ;
L.draw() ;
showStatus("UFO ATTACK") ;
// Action loop
for (;;) {
ti = System.currentTimeMillis() ;
// If there is place for one more UFO, try to add one
// with some probability
if ((UV.size() < NU) &&
(Math.random() > (UV.size() == 0 ? 0.90 : 0.98))) {
newufo.play() ; // Play a bell
U = new UFO(this) ;
U.set_color(ufoColor) ;
// Set the UFO to fast descent if:
if (score > 10 && Math.random() > 0.7) U.vy -= 1 ;
// Add UFO to the list
UV.addElement(U) ;
}
// Draw the explosion in the backdrop
// and eliminate it from the list if ended
for (int j=EV.size()-1; j>=0 ; --j) {
E = (Explosion) EV.elementAt(j) ;
if (E.active) {
// System.out.println("Drawing Explosion " + j) ;
E.draw() ;
}
else {
// System.out.println("Ending Explosion " + j) ;
E.erase() ;
EV.removeElementAt(j) ;
}
}
// Move the launcher and the missile
L.move() ;
if (M.active() == true) M.move() ;
// Move each UFO
for (int i=0; i < UV.size(); ++i) {
U = (UFO) UV.elementAt(i) ;
U.move() ;
}
// Check for collision between UFO and missile
for (int i=(UV.size()-1); i >=0 ; --i) {
U = (UFO) UV.elementAt(i) ;
if (U.active() && M.active() && U.collision(M)) {
++score ;
explosion.stop() ;
display_score() ;
explosion.play() ;
// Increase the max # of UFOs every 10 destroyed
// till we reach a max of 5 attacking
if ((NU < 5) && (score % 10) == 1) ++NU ;
// Erase the missile and deactivate it
M.active(false) ;
M.erase() ;
// Erase and deactivate the UFO hit
U.active(false) ;
U.erase() ;
// Display an explosion
E = new Explosion(this,U.px,U.py) ;
// System.out.println("Adding Explosion") ;
EV.addElement(E) ;
}
// Draw the UFO or eliminate it from the list
if (U.active())
U.draw() ;
else
UV.removeElementAt(i) ;
// If a UFO reaches the floor then you've lost
if ((U.py - U.h/2) <=0) {
game_over = true ;
display_game_over() ;
return ;
}
}
// If the launcher moves... redraw
if (L.has_moved() || ((M.py-M.h) < (L.py+L.h)) || (! M.active()) )
L.draw() ;
// If active redraw the missile
if (M.active() == true) M.draw() ;
// Make the loop last 20ms in case the CPU is too fast...
ti = System.currentTimeMillis() - ti ;
ti = 20 - ti ;
ti = ti > 0 ? 10 + ti : 10 ; // At least sleep por 10ms
Thread.yield() ; // Let the GC work?
try {Thread.sleep(ti);} catch (InterruptedException e) { } ;
// Repaint every 100 cycles... just in case
if ((count = ++count % 500) == 0) {
repaint() ;
// g.drawImage(buffer,0,0,this) ;
}
}
}
public void display_score() {
Graphics bkd_g = backdrop.getGraphics();
bkd_g.clipRect(window_size.width/2, 0, window_size.width/2, 40);
bkd_g.drawImage(bgimg,0,0,window_size.width,window_size.height,this) ;
bkd_g.setColor(Color.red) ;
bkd_g.setFont(font) ;
String aux = score > 9 ? "" : "0" ;
bkd_g.drawString(aux+score, window_size.width - 60,30) ;
bkd_g.dispose() ;
// bkd_g = null ;
Graphics bg = buffer.getGraphics() ;
bg.clipRect(0, 0, window_size.width, 40);
bg.drawImage(backdrop,0,0,this) ;
bg.dispose() ;
// bg = null ;
Graphics g = getGraphics() ;
g.clipRect(0, 0, window_size.width, 40);
g.drawImage(buffer,0,0,this) ;
g.dispose() ;
// g = null ;
}
public void display_game_over() {
set_say_font(font) ;
set_say_mode(CENTER) ;
set_say_style(SHADOW) ;
set_say_pos(10,80) ;
say("GAME OVER") ;
set_say_font(font_s) ;
set_say_style(NORMAL) ;
say("(click to start)") ;
repaint() ;
try {Thread.sleep(500);} catch (InterruptedException e) { } ;
}
public boolean mouseMove(Event e, int x, int y) {
// showStatus("mouse at: (" + x + ", " + y + ")");
mouse_x = x ;
return true;
}
// Capture the mouse clicks
public boolean mouseDown(Event e, int x, int y) {
if (game_over) {
game_over = false ;
if (game != null) {
game.stop() ;
game = null ;
}
NU = 1 ;
score = 0 ;
M.active(false) ;
UV.removeAllElements() ;
EV.removeAllElements() ;
game = new Thread(this) ;
game.setPriority(Thread.MIN_PRIORITY) ;
game.start() ;
buf_g.dispose() ;
return true ;
}
if (M != null && ! M.active()) {
missile_launch.stop() ;
missile_launch.play() ;
M.set_pos(L.px,L.py) ;
M.active(true) ;
}
return true;
}
// The paint methos just draws the buffer
public void paint(Graphics g) {
if (buffer != null) g.drawImage(buffer, 0, 0, this);
}
// Makes an animation smoother
public void update(Graphics g) {
paint(g) ;
}
// Get the Frame of this applet
public Frame getFrame(Component c) {
while( c != null && !(c instanceof java.awt.Frame) )
c = c.getParent();
return (Frame) c;
}
// Text Display Constants
public static final int CENTER = 1 ; // Modes: Centered
public static final int LEFT = 2 ; // Left Justified
public static final int RIGHT = 3 ; // Right Justified
public static final int FREE = 0 ; // At x,y
public static final int NORMAL = 0 ; // Styles: Normal
public static final int SHADOW = 1 ; // Shadowed
// Text Display Variables
private int say_pos_y = 0 ;
private int say_pos_x = 0 ;
private int say_mode = -1 ;
private int say_style = -1 ;
private int say_margin = 10 ;
private Font say_font = null ;
// Text Print Methods
public void say(String s, int x, int y) {
set_say_pos(x, y) ;
say(s) ;
}
public void say(String s) {
FontMetrics fm = getFontMetrics(say_font) ;
// Compute the x position
switch(say_mode) {
case CENTER:
say_pos_x = (window_size.width - fm.stringWidth(s))/2 ;
break ;
case RIGHT:
say_pos_x = window_size.width - fm.stringWidth(s) - say_margin ;
break ;
case LEFT:
default :
say_pos_x = say_margin ;
break ;
}
Graphics bg = buffer.getGraphics() ;
bg.setFont(say_font) ;
// Print style extras
if (say_style == SHADOW) {
bg.setColor(new Color(150,150,150)) ;
bg.drawString(s, say_pos_x+2,say_pos_y+1) ;
}
// Print string
bg.setColor(Color.white) ;
bg.drawString(s, say_pos_x,say_pos_y) ;
// Shift y position to next line
say_pos_y += (int) (1.2 * fm.getHeight()) ;
// Free some resources
bg.dispose() ;
}
public void set_say_mode(int m) {
say_mode = m ;
}
public void set_say_style(int s) {
say_style = s ;
}
public void set_say_font(Font f) {
say_font = f ;
}
public void set_say_margin(int margin) {
say_margin = margin ;
}
public void set_say_pos(int x, int y) {
say_pos_x = x ;
say_pos_y = y ;
}
}
class Piece {
UFO_Attack a ;
int px,py ;
int opx,opy ;
int w,h ;
int vx,vy ;
Color c ;
boolean active = false ;
Image img = null ;
public void set_pos(int x, int y) {
px = opx = x ;
py = opy = y ;
}
public void set_vel(int x,int y) {
vx = x ;
vy = y ;
}
public void set_size(int x,int y) {
w = x ;
h = y ;
}
public void set_color(Color c) {
this.c = c ;
}
public void set_draw_rectangles(Rectangle o, Rectangle n) {
int sh = a.window_size.height ;
int x = px - w/2 ;
int y = (sh - py) - h/2 ;
int ox = opx - w/2 ;
int oy = (sh - opy) - h/2 ;
o.reshape(ox,oy,w,h) ;
n.reshape(x,y,w,h) ;
}
public boolean active() {
return active ;
}
public void active(boolean s) {
active = s ;
}
public boolean collision(Piece p) {
int dpx = Math.abs(px - p.px) ;
int dpy = Math.abs(py - p.py) ;
if ((dpx < (Math.max(w/2,p.w/2))+1) && (dpy < (Math.max(h/2,p.h/2)+1)))
return true ;
return false ;
}
public void draw() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// a.buf_g.setColor(a.bgColor);
// a.buf_g.fillRect(a.paint_area.x, a.paint_area.y, w, h);
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// bg = null ;
a.buf_g.setColor(c);
a.buf_g.fillRect(a.new_area.x, a.new_area.y, w, h);
a.paint_area.add(a.new_area) ;
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x ,a.paint_area.y, a.paint_area.width, a.paint_area.height);
g.drawImage(a.buffer, 0, 0, a);
g.dispose() ;
// g = null ;
}
public void erase() {
set_draw_rectangles(a.paint_area, a.new_area) ;
a.paint_area.add(a.new_area) ;
// Copy the backdrop into the buffer
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.paint_area.x, a.paint_area.y, a.paint_area.width, a.paint_area.height);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// Paint the change into the screen
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x,a.paint_area.y,a.paint_area.width,a.paint_area.height);
g.drawImage(a.buffer,0,0, a);
g.dispose() ;
}
}
class Launcher extends Piece {
public Launcher (UFO_Attack a) {
this.a = a ;
w = 12 ;
h = 22 ;
px = opx = a.window_size.width/2 ;
py = opy = w/2+1 ;
active = true ;
img = a.missile ;
}
public void move() {
opx = px ;
opy = py ;
int dx = a.mouse_x - px ;
int abs_dx = Math.abs(dx) ;
int step = 1 ;
if (abs_dx > 10)
step = 5 ;
else if (abs_dx > 1)
step = abs_dx/2 ;
if (dx != 0) {
px += step*(dx/abs_dx) ;
if (px < w/2)
px = w/2 ;
else if (px > (a.window_size.width - w/2))
px = a.window_size.width - w/2 ;
}
}
public boolean has_moved() {
if ((px - opx) != 0) return true ;
return false ;
}
public void draw() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// a.buf_g.setColor(a.bgColor);
// a.buf_g.fillRect(a.paint_area.x, a.paint_area.y, w, h);
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// bg = null ;
if (a.M.active()) {
a.buf_g.setColor(c);
a.buf_g.fillRect(a.new_area.x, a.new_area.y, w, h);
}
else {
bg = a.buffer.getGraphics() ;
bg.clipRect(a.new_area.x, a.new_area.y, w, h);
bg.drawImage(img,a.new_area.x,a.new_area.y,a) ;
bg.dispose() ;
// bg = null ;
}
a.paint_area.add(a.new_area) ;
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x ,a.paint_area.y, a.paint_area.width, a.paint_area.height);
g.drawImage(a.buffer, 0, 0, a);
g.dispose() ;
// g = null ;
}
}
class Missile extends Piece {
public Missile (UFO_Attack a) {
this.a = a ;
px = opx = 0 ;
py = opy = 0 ;
vx = 0 ;
vy = 7 ;
w = 12 ;
h = 22 ;
active = false ;
img = a.missile ;
}
public void move() {
opx = px ;
opy = py ;
px = a.L.px ;
// Try to make the speed more realistic
int dx = px - opx ;
int nvy = vy*vy - dx*dx ;
if (nvy > 0) nvy = (int) Math.sqrt(nvy) ; // Should exceptions
if (nvy < 1) nvy = 1 ;
py += nvy ;
if (py > a.window_size.height + 2*h) active = false ;
}
int seq = 0 ;
// int seq2 = 0 ;
public void draw() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// a.buf_g.setColor(a.bgColor);
// a.buf_g.fillRect(a.paint_area.x, a.paint_area.y, w, h);
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// bg = null ;
// if ((++seq2 % 4) == 0) seq = ++seq % 1 ;
int dx = px - opx ;
seq = 0 ;
if (dx > 0)
seq = 1 ;
else if (dx < 0)
seq = 2 ;
bg = a.buffer.getGraphics() ;
bg.clipRect(a.new_area.x, a.new_area.y, w, h);
bg.drawImage(img,a.new_area.x-w*seq,a.new_area.y,a) ;
bg.dispose() ;
// bg = null ;
a.paint_area.add(a.new_area) ;
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x ,a.paint_area.y, a.paint_area.width, a.paint_area.height);
g.drawImage(a.buffer, 0, 0, a);
g.dispose() ;
// g = null ;
}
}
class UFO extends Piece {
public UFO (UFO_Attack a) {
this.a = a ;
vx = (Math.random() > 0.5 ? 1 : -1) ;
vy = -2 ;
w = 20 ;
h = 8 ;
int aw = a.window_size.width ;
px = opx = (int) (w/2+1 + (aw-w-2)* Math.random()) ;
py = opy = a.window_size.height + h/2 + 1 ;
active = true ;
img = a.ufostrip ;
}
public void move() {
opx = px ;
opy = py ;
px += vx ;
py += vy ;
if (py < -h/2) active = false ;
if ((px <= w/2) ||
(px >= (a.window_size.width - w/2)) ||
(Math.random() > 0.96)) {
vx = -vx ;
}
}
int seq = 0 ;
int seq2 = 0 ;
public void draw() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// Clear the old image
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// bg = null ;
// Choose the image sequence (every 4 draws change frame)
if ((++seq2 % 4) == 0) seq = ++seq % 4 ;
// Paint new region into buffer
bg = a.buffer.getGraphics() ;
bg.clipRect(a.new_area.x, a.new_area.y, w, h);
bg.drawImage(img,a.new_area.x-w*seq,a.new_area.y,a) ;
bg.dispose() ;
// Add old and new areas for updating
a.paint_area.add(a.new_area) ;
// Paint changes into screen buffer
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x ,a.paint_area.y, a.paint_area.width, a.paint_area.height);
g.drawImage(a.buffer, 0, 0, a);
g.dispose() ;
}
}
class Explosion extends Piece {
public Explosion (UFO_Attack a, int x, int y) {
this.a = a ;
w = 30 ;
h = 30 ;
px = opx = x ;
py = opy = y ;
active = true ;
img = a.missile_explosion ;
}
int seq = 0 ;
int seq2 = 0 ;
public void draw() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// Clear the old image
Graphics bkd_g = a.backdrop.getGraphics();
bkd_g.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bkd_g.drawImage(a.bgimg,0,0,a.window_size.width,a.window_size.height,a) ;
// Choose the image sequence (every 4 draws change frame)
if ((++seq2 % 4) == 0) seq = ++seq % 5 ;
// Deactivate after drawing the last explosion frame
if (seq == 4) active = false ;
// Paint new region into buffer
bkd_g.clipRect(a.new_area.x, a.new_area.y, w, h);
bkd_g.drawImage(img,a.new_area.x-w*seq,a.new_area.y,a) ;
bkd_g.dispose() ;
// Paint changes into the buffer
Graphics bg = a.buffer.getGraphics() ;
bg.clipRect(a.new_area.x,a.new_area.y,w,h);
bg.drawImage(a.backdrop,0,0,a) ;
bg.dispose() ;
// Paint changes into screen buffer
Graphics g = a.getGraphics() ;
g.clipRect(a.paint_area.x ,a.paint_area.y, a.paint_area.width, a.paint_area.height);
g.drawImage(a.buffer, 0, 0, a);
g.dispose() ;
}
public void erase() {
set_draw_rectangles(a.paint_area, a.new_area) ;
// Clear the old image
Graphics bkd_g = a.backdrop.getGraphics();
bkd_g.clipRect(a.paint_area.x, a.paint_area.y, w, h);
bkd_g.drawImage(a.bgimg,0,0,a.window_size.width,a.window_size.height,a) ;
bkd_g.dispose() ;
// Do the same for the buffer and the screen
// It will flicker any UFO on top...
super.erase() ;
}
}
]]>