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340 lines
9.2 KiB
HTML
340 lines
9.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<style type="text/css">
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.intro { font-size:10pt; font-style:italic }
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.heading { font-size:14pt; font-weight:bold; font-family:sans-serif }
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.title { font-size:18pt; font-weight:bold; background-color:navy; color:white; text-align:center; font-family:sans-serif }
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</style>
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</HEAD>
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<title>Untitled</title>
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</head>
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<body bgcolor="Cornsilk">
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<center><h1>Battleship</h1><br><hr><br>
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<font color="Red">Good Luck!</font>
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<SCRIPT LANGUAGE="JavaScript">
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<!-- Original: Jason Hotchkiss (jasonhotchkiss@home.com) -->
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<!-- Web Site: http://www.members.home.com/jasonhotchkiss -->
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<!-- This script and many more are available free online at -->
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<!-- The JavaScript Source!! http://javascript.internet.com -->
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<!-- Begin
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/* Information used to draw the ships
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*/
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var ship = [[[1,5], [1,2,5], [1,2,3,5], [1,2,3,4,5]], [[6,10], [6,7,10], [6,7,8,10], [6,7,8,9,10]]];
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/* Information used to draw sunk ships
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*/
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var dead = [[[201,203], [201,202,203], [201,202,202,203], [201,202,202,202,203]], [[204,206], [204,205,206], [204,205,205,206], [204,205,205,205,206]]];
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/* Information used to describe ships
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*/
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var shiptypes = [["Minesweeper",2,4],["Frigate",3,4],[ "Cruiser",4,2],[ "Battleship",5,1]];
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var gridx = 16, gridy = 16;
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var player = [], computer = [], playersships = [], computersships = [];
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var playerlives = 0, computerlives = 0, playflag=true, statusmsg="";
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/* Function to preload all the images, to prevent delays during play
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*/
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var preloaded = [];
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function imagePreload() {
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var i,ids = [1,2,3,4,5,6,7,8,9,10,100,101,102,103,201,202,203,204,205,206];
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window.status = "Preloading images...please wait";
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for (i=0;i<ids.length;++i) {
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var img = new Image, name = "batt"+ids[i]+".gif";
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img.src = name;
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preloaded[i] = img;
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}
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window.status = "";
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}
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/* Function to place the ships in the grid
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*/
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function setupPlayer(ispc) {
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var y,x;
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grid = [];
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for (y=0;y<gridx;++y) {
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grid[y] = [];
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for (x=0;x<gridx;++x)
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grid[y][x] = [100,-1,0];
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}
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var shipno = 0;
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var s;
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for (s=shiptypes.length-1;s>=0;--s) {
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var i;
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for (i=0;i<shiptypes[s][2];++i) {
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var d = Math.floor(Math.random()*2);
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var len = shiptypes[s][1], lx=gridx, ly=gridy, dx=0, dy=0;
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if ( d==0) {
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lx = gridx-len;
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dx=1;
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}
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else {
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ly = gridy-len;
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dy=1;
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}
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var x,y,ok;
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do {
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y = Math.floor(Math.random()*ly);
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x = Math.floor(Math.random()*lx);
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var j,cx=x,cy=y;
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ok = true;
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for (j=0;j<len;++j) {
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if (grid[cy][cx][0] < 100) {
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ok=false;
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break;
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}
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cx+=dx;
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cy+=dy;
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}
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} while(!ok);
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var j,cx=x,cy=y;
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for (j=0;j<len;++j) {
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grid[cy][cx][0] = ship[d][s][j];
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grid[cy][cx][1] = shipno;
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grid[cy][cx][2] = dead[d][s][j];
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cx+=dx;
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cy+=dy;
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}
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if (ispc) {
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computersships[shipno] = [s,shiptypes[s][1]];
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computerlives++;
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}
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else {
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playersships[shipno] = [s,shiptypes[s][1]];
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playerlives++;
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}
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shipno++;
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}
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}
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return grid;
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}
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/* Function to change an image shown on a grid
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*/
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function setImage(y,x,id,ispc) {
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if ( ispc ) {
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computer[y][x][0] = id;
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document.images["pc"+y+"_"+x].src = "batt"+id+".gif";
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}
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else {
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player[y][x][0] = id;
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document.images["ply"+y+"_"+x].src = "batt"+id+".gif";
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}
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}
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/* Function to insert HTML source for a grid
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*/
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function showGrid(ispc) {
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var y,x;
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for (y=0;y<gridy;++y) {
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for (x=0;x<gridx;++x) {
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if ( ispc )
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document.write ('<a href="javascript:gridClick('+y+','+x+');"><img name="pc'+y+'_'+x+'" src="batt100.gif" width=16 height=16></a>');
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else
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document.write ('<a href="javascript:void(0);"><img name="ply'+y+'_'+x+'" src="batt'+player[y][x][0]+'.gif" width=16 height=16></a>');
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}
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document.write('<br>');
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}
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}
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/* Handler for clicking on the grid
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*/
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function gridClick(y,x) {
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if ( playflag ) {
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if (computer[y][x][0] < 100) {
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setImage(y,x,103,true);
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var shipno = computer[y][x][1];
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if ( --computersships[shipno][1] == 0 ) {
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sinkShip(computer,shipno,true);
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alert("You sank my "+shiptypes[computersships[shipno][0]][0]+"!");
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updateStatus();
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if ( --computerlives == 0 ) {
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alert("You win! Press the Refresh button on\n"+
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"your browser to play another game.");
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playflag = false;
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}
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}
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if ( playflag ) computerMove();
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}
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else if (computer[y][x][0] == 100) {
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setImage(y,x,102,true);
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computerMove();
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}
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}
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}
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/* Function to make the computers move. Note that the computer does not cheat, oh no!
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*/
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function computerMove() {
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var x,y,pass;
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var sx,sy;
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var selected = false;
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/* Make two passes during 'shoot to kill' mode
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*/
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for (pass=0;pass<2;++pass) {
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for (y=0;y<gridy && !selected;++y) {
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for (x=0;x<gridx && !selected;++x) {
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/* Explosion shown at this position
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*/
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if (player[y][x][0]==103) {
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sx=x; sy=y;
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var nup=(y>0 && player[y-1][x][0]<=100);
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var ndn=(y<gridy-1 && player[y+1][x][0]<=100);
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var nlt=(x>0 && player[y][x-1][0]<=100);
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var nrt=(x<gridx-1 && player[y][x+1][0]<=100);
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if ( pass == 0 ) {
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/* On first pass look for two explosions
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in a row - next shot will be inline
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*/
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var yup=(y>0 && player[y-1][x][0]==103);
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var ydn=(y<gridy-1 && player[y+1][x][0]==103);
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var ylt=(x>0 && player[y][x-1][0]==103);
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var yrt=(x<gridx-1 && player[y][x+1][0]==103);
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if ( nlt && yrt) { sx = x-1; selected=true; }
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else if ( nrt && ylt) { sx = x+1; selected=true; }
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else if ( nup && ydn) { sy = y-1; selected=true; }
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else if ( ndn && yup) { sy = y+1; selected=true; }
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}
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else {
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/* Second pass look for single explosion -
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fire shots all around it
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*/
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if ( nlt ) { sx=x-1; selected=true; }
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else if ( nrt ) { sx=x+1; selected=true; }
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else if ( nup ) { sy=y-1; selected=true; }
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else if ( ndn ) { sy=y+1; selected=true; }
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}
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}
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}
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}
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}
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if ( !selected ) {
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/* Nothing found in 'shoot to kill' mode, so we're just taking
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potshots. Random shots are in a chequerboard pattern for
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maximum efficiency, and never twice in the same place
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*/
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do{
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sy = Math.floor(Math.random() * gridy);
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sx = Math.floor(Math.random() * gridx/2)*2+sy%2;
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} while( player[sy][sx][0]>100 );
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}
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if (player[sy][sx][0] < 100) {
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/* Hit something
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*/
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setImage(sy,sx,103,false);
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var shipno = player[sy][sx][1];
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if ( --playersships[shipno][1] == 0 ) {
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sinkShip(player,shipno,false);
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alert("I sank your "+shiptypes[playersships[shipno][0]][0]+"!");
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if ( --playerlives == 0 ) {
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knowYourEnemy();
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alert("I win! Press the Refresh button on\n"+
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"your browser to play another game.");
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playflag = false;
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}
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}
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}
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else {
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/* Missed
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*/
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setImage(sy,sx,102,false);
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}
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}
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/* When whole ship is hit, show it using changed graphics
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*/
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function sinkShip(grid,shipno,ispc) {
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var y,x;
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for (y=0;y<gridx;++y) {
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for (x=0;x<gridx;++x) {
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if ( grid[y][x][1] == shipno )
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if (ispc) setImage(y,x,computer[y][x][2],true);
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else setImage(y,x,player[y][x][2],false);
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}
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}
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}
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/* Show location of all the computers ships - when player has lost
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*/
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function knowYourEnemy() {
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var y,x;
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for (y=0;y<gridx;++y) {
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for (x=0;x<gridx;++x) {
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if ( computer[y][x][0] == 103 )
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setImage(y,x,computer[y][x][2],true);
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else if ( computer[y][x][0] < 100 )
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setImage(y,x,computer[y][x][0],true);
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}
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}
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}
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/* Show how many ships computer has left
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*/
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function updateStatus() {
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var f=false,i,s = "Computer has ";
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for (i=0;i<computersships.length;++i) {
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if (computersships[i][1] > 0) {
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if (f) s=s+", "; else f=true;
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s = s + shiptypes[computersships[i][0]][0];
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}
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}
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if (!f) s = s + "nothing left, thanks to you!";
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statusmsg = s;
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window.status = statusmsg;
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}
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function setStatus() {
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window.status = statusmsg;
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}
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/* Start the game!
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*/
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imagePreload();
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player = setupPlayer(false);
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computer = setupPlayer(true);
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document.write("<center><table><tr><td align=center><p class='heading'>COMPUTER'S FLEET</p></td>"+
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"<td align=center><p class='heading'>PLAYER'S FLEET</p></td></tr><tr><td>");
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showGrid(true);
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document.write("</td><td>");
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showGrid(false);
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document.write("</td></tr></table></center>");
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updateStatus();
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setInterval("setStatus();", 500);
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// End -->
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</script>
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<p class="intro">"...We have located the enemy fleet under the command of Admiral Komp<6D>ter,
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but do not yet have visual contact. We suggest the best course of action is to fire
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at random into their vicinity and listen for the impact of the shells...</p>
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<p class="intro">...Our intelligence sources indicate the composition of the enemy fleet is the same
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as our own, and has likewise been forced to resort to the same tactics as ourselves. In accordance with
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the rules of war, fire will be exchanged one shell at a time and vessels lost will be announced
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immediately...</p>
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<p class="intro">...As per your orders you have been placed directly in command of the fleet's guns. Select the target
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location by clicking in the left-hand grid above. The right hand grid shows the status of our own fleet.
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Information as to the remaining strength of the enemy will be relayed directly to your status bar...</p>
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<p class="intro">...We believe this battle will not be over until one or other fleet is sunk in it's entirety. Our gunners
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await your commands. We're counting on you, Sir..."</p>
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<!-- STEP THREE: Save the battleship images into your web site directory
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You can get the zip file by going to
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http://javascript.internet.com/img/battleship/battleship.zip
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then unzip the images and upload to your site. -->
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</body>
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</html>
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