BreakOut
Java Source:
//
// Breakout game
//
// (C)2000
// Brian Postma
// b.postma@hetnet.nl
//
import java.awt.*;
import java.applet.Applet;
public class Breakout extends Applet implements Runnable
{
Dimension d;
Font largefont = new Font("Helvetica", Font.BOLD, 24);
Font smallfont = new Font("Helvetica", Font.BOLD, 14);
FontMetrics fmsmall, fmlarge;
Graphics goff;
Image ii;
Thread thethread;
boolean ingame=false;
int player1score;
int ballx,bally;
int batpos;
int batdpos=0;
int balldx=0, balldy=0;
int dxval;
int ballsleft;
int count;
boolean showtitle=true;
boolean[] showbrick;
int bricksperline;
final int borderwidth=5;
final int batwidth=20;
final int ballsize=5;
final int batheight=5;
final int scoreheight=20;
final int screendelay=300;
final int brickwidth=15;
final int brickheight=8;
final int brickspace=2;
final int backcol=0x102040;
final int numlines=4;
final int startline=32;
public String getAppletInfo()
{
return("Breakout - by Brian Postma");
}
public void init()
{
Graphics g;
d = size();
setBackground(new Color(backcol));
bricksperline=(d.width-2*borderwidth)/(brickwidth+brickspace);
d.width=bricksperline*(brickwidth+brickspace)+(2*borderwidth);
g=getGraphics();
g.setFont(smallfont);
fmsmall = g.getFontMetrics();
g.setFont(largefont);
fmlarge = g.getFontMetrics();
showbrick=new boolean[bricksperline*numlines];
GameInit();
}
public void GameInit()
{
batpos=(d.width-batwidth)/2;
ballx=(d.width-ballsize)/2;
bally=(d.height-ballsize-scoreheight-2*borderwidth);
player1score=0;
ballsleft=3;
dxval=2;
if (Math.random()<0.5)
balldx=dxval;
else
balldx=-dxval;
balldy=-dxval;
count=screendelay;
batdpos=0;
InitBricks();
}
public void InitBricks()
{
int i;
for (i=0; i0 && d.height>0)
{
ii = createImage(d.width, d.height);
goff = ii.getGraphics();
}
if (goff==null || ii==null)
return;
goff.setColor(new Color(backcol));
goff.fillRect(0, 0, d.width, d.height);
if (ingame)
PlayGame();
else
ShowIntroScreen();
g.drawImage(ii, 0, 0, this);
}
public void PlayGame()
{
MoveBall();
CheckBat();
CheckBricks();
DrawPlayField();
DrawBricks();
ShowScore();
}
public void ShowIntroScreen()
{
String s;
MoveBall();
CheckBat();
CheckBricks();
BatDummyMove();
DrawPlayField();
DrawBricks();
ShowScore();
goff.setFont(largefont);
goff.setColor(new Color(96,128,255));
if (showtitle)
{
s="Java Breakout";
goff.drawString(s,(d.width-fmlarge.stringWidth(s)) / 2, (d.height-scoreheight-borderwidth)/2 - 20);
s="(c)2000 by Brian Postma";
goff.setFont(smallfont);
goff.setColor(new Color(255,160,64));
goff.drawString(s,(d.width-fmsmall.stringWidth(s))/2,(d.height-scoreheight-borderwidth)/2 + 10);
s="b.postma@hetnet.nl";
goff.drawString(s,(d.width-fmsmall.stringWidth(s))/2,(d.height-scoreheight-borderwidth)/2 + 30);
}
else
{
goff.setFont(smallfont);
goff.setColor(new Color(96,128,255));
s="'S' to start game";
goff.drawString(s,(d.width-fmsmall.stringWidth(s))/2,(d.height-scoreheight-borderwidth)/2 - 10);
goff.setColor(new Color(255,160,64));
s="Use cursor left and right to move";
goff.drawString(s,(d.width-fmsmall.stringWidth(s))/2,(d.height-scoreheight-borderwidth)/2 + 20);
}
count--;
if (count<=0)
{ count=screendelay; showtitle=!showtitle; }
}
public void DrawBricks()
{
int i,j;
boolean nobricks=true;
int colordelta=255/(numlines-1);
for (j=0; j=(d.height-ballsize-scoreheight))
{
if (ingame)
{
ballsleft--;
if (ballsleft<=0)
ingame=false;
}
ballx=batpos+(batwidth-ballsize)/2;
bally=startline+numlines*(brickheight+brickspace);
balldy=dxval;
balldx=0;
}
if (ballx>=(d.width-borderwidth-ballsize))
{
balldx=-balldx;
ballx=d.width-borderwidth-ballsize;
}
if (ballx<=borderwidth)
{
balldx=-balldx;
ballx=borderwidth;
}
}
public void BatDummyMove()
{
if (ballx<(batpos+2))
batpos-=3;
else if (ballx>(batpos+batwidth-3))
batpos+=3;
}
public void CheckBat()
{
batpos+=batdpos;
if (batpos(d.width-borderwidth-batwidth))
batpos=(d.width-borderwidth-batwidth);
if (bally>=(d.height-scoreheight-2*borderwidth-ballsize) &&
bally<(d.height-scoreheight-2*borderwidth) &&
(ballx+ballsize)>=batpos && ballx<=(batpos+batwidth))
{
bally=d.height-scoreheight-ballsize-borderwidth*2;
balldy=-dxval;
balldx=CheckBatBounce(balldx,ballx-batpos);
}
}
public int CheckBatBounce(int dy, int delta)
{
int sign;
int stepsize, i=-ballsize, j=0;
stepsize=(ballsize+batwidth)/8;
if (dy>0)
sign=1;
else
sign=-1;
while(ii)
{
i+=stepsize;
j++;
}
switch(j)
{
case 0:
case 1:
return -4;
case 2:
return -3;
case 7:
return 3;
case 3:
case 6:
return sign*2;
case 4:
case 5:
return sign*1;
default:
return 4;
}
}
public void CheckBricks()
{
int i,j,x,y;
int xspeed=balldx;
if (xspeed<0) xspeed=-xspeed;
int ydir=balldy;
if (bally<(startline-ballsize) || bally>(startline+numlines*(brickspace+brickheight)))
return;
for (j=0; j=(y-ballsize) && bally<(y+brickheight) &&
ballx>=(x-ballsize) && ballx<(x+brickwidth))
{
showbrick[j*bricksperline+i]=false;
if (ingame)
player1score+=(numlines-j);
// Where did we hit the brick
if (ballx>=(x-ballsize) && ballx<=(x-ballsize+3))
{ // leftside
balldx=-xspeed;
}
else if (ballx<=(x+brickwidth-1) && ballx>=(x+brickwidth-4))
{ // rightside
balldx=xspeed;
}
balldy=-ydir;
}
}
}
}
}
public void run()
{
long starttime;
Graphics g;
Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
g=getGraphics();
while(true)
{
starttime=System.currentTimeMillis();
try
{
paint(g);
starttime += 20;
Thread.sleep(Math.max(0, starttime-System.currentTimeMillis()));
}
catch (InterruptedException e)
{
break;
}
}
}
public void start()
{
if (thethread == null) {
thethread = new Thread(this);
thethread.start();
}
}
public void stop()
{
if (thethread != null) {
thethread.stop();
thethread = null;
}
}
}
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