<script language="javascript" type="text/javascript"> <!-- Original: Adam Stock (adam (at) digital-biz.com) --> <!-- (c) Copyright 1998-99 Adam L. Stock. All Rights Reserved --> <!-- You have permission to republish this code provided --> <!-- that you do not remove this copyright notice --> <!-- Begin imgdir = "./"; function preload() { this.length = preload.arguments.length; for (var i = 0; i < this.length; i++) { this[i] = new Image(); this[i].src = imgdir + preload.arguments[i]; } } var pics = new preload("disk1.gif","disk2.gif","disk3.gif","disk4.gif","disk5.gif","disk6.gif","disk7.gif","post.gif", "posttop.gif", "disk1h.gif","disk2h.gif","disk3h.gif","disk4h.gif","disk5h.gif","disk6h.gif","disk7h.gif"); var selectedr = null; var selectedc = null; var maxposts = 3; var maxdisks = 7; var all_posts = 3; var startpost = 1; var endpost = (startpost-1 < 0 ? maxposts-1 : startpost-1); var disks = 7; var imgwidth = 160; var imgheight = 14; var game_is_over = false; var show_messages = false; var board = new Array(maxposts); board[0] = new Array(maxdisks + 1); board[1] = new Array(maxdisks + 1); board[2] = new Array(maxdisks + 1); function initboard(startpost, disks) { var len = board[0].length; selectedc = null; selectedr = null; game_is_over = false; endpost = (startpost-1 < 0 ? maxposts-1 : startpost-1); for (i = 0; i < len; i++) { board[0][i] = 0; board[1][i] = 0; board[2][i] = 0; } for (i = len-disks, j = 0; i < len; i++, j++) { board[startpost][i] = len - j - 1; } } function drawall() { for (j=0; j<board.length; j++) { for (i=0; i<board[j].length; i++) { draw(j,i, getName( board[j][i])); } } message("Versuche den Stapel Scheiben auf einen anderen Pfahl zu legen."); } function restart(start) { startpost = start; disks = document.forms[0].disc.options[document.forms[0].disc.selectedIndex].text; initboard(startpost,disks); drawall(); theAnim = new Animation(); } initboard(startpost, disks); function getName( num ) { if (num == 0) return "post.gif"; return "disk" + num + ".gif"; } function message(str, force) { if (force || !game_is_over && !show_messages) document.disp.message.value = str; } function messageadd(str) { if (!game_is_over) document.disp.message.value = document.disp.message.value + "n" + str; } function isempty(num) { for (i = 0; i < board[num].length; i++) { if ( board[num][i] != 0) return false; } return true; } function topmost(num) { for (i = 0; i < board[num].length; i++) { if (board[num][i] != 0) return i; } return -1; } function ispost(i,j) { return (board[j][i] == 0); } function istopdisk(i,j) { return (board[j][i-1] == 0); } function drawboard() { document.writeln("<h3>Die Türme von Hanoi</h3><p>"); document.writeln("<table cellspacing='0' cellpadding='0' border='0'>"); document.write("<tr>"); for (j = 0; j < board.length; j++) { document.write("<td>"); document.write("<a href='javascript:clicked("+0+","+j+")'><img src='" + imgdir + "posttop.gif' border='0' alt='' /></a><br />"); for (i=0; i< board[0].length; i++) { document.write("<a href='javascript:clicked("+i+","+j+")'>"); document.write("<img src='" + imgdir + getName(board[j][i]) + "' name='pos"+ j + i + "' border='0' alt='' /><br />"); document.write("</a>"); } document.writeln("</td>"); } document.write("</tr></table>"); document.write("<form name='disp'><textarea name='message' wrap='virtual' rows='2' cols='40'>
"); document.write("Disks: 34567"); document.write(""); document.write(""); } function draw(x,y,name) { document.images["pos"+x+""+y].src = imgdir + name; } function animate(x,y,name) { theAnim.addFrame( "pos"+x+""+y, imgdir + name); } function clicked(i,j) { document.forms[0].message.focus(); // get rid of annoying outline in MSIE document.forms[0].message.blur(); if (game_is_over) restart(startpost = endpost); if (!isselection() && ispost(i,j)) { message("Wähle eine Scheibe."); return; } if (!ispost(i,j)) { toggle(j); return; }; if (ispost(i,j) && selectedc == j) { message("Lege die Scheibe auf einen Pfahl."); return; } if (!legalmove(j)) { message("Illegaler Zug, die grössten Scheiben müssen immer unten liegen."); return; } move(j); return; } function legalmove(j) { if (isempty(j)) return true; return (board[j][topmost(j)] < board[selectedc][selectedr]); } function isselection() { return selectedc != null; } function toggle( num ) { var toppos = topmost(num); if (selectedc == num && selectedr == toppos) { selectedc = null; selectedr = null; animate(num,toppos,"disk" + board[num][toppos] + ".gif"); message("Wähle eine Scheibe."); return; } if (isselection()) { animate(selectedc,selectedr,"disk" + board[selectedc][selectedr] + ".gif"); } selectedc = num; selectedr = toppos; animate(num,toppos,"disk" + board[num][toppos] + "h.gif"); message("Klicke auf einen Pfahl, auf den die Scheibe gelegt werden soll."); } function move( num ) { var toppos = (!isempty(num) ? topmost(num) : board[num].length); board[num][toppos-1] = board[selectedc][selectedr]; board[selectedc][selectedr] = 0; animate(selectedc,selectedr,"post.gif"); animate(num,toppos-1,"disk" + board[num][toppos-1] + ".gif"); selectedc = null; selectedr = null; message("Wähle eine Scheibe."); game_over(); } function hanoi(no_of_disks, start_post, goal_post) { if (no_of_disks > 0) { var free_post = all_posts - start_post - goal_post; hanoi (no_of_disks - 1, start_post, free_post); show_messages = true; toggle(start_post); move(goal_post); show_messages = false; hanoi (no_of_disks - 1 , free_post, goal_post); game_over(true); } } function game_over(forceMsg) { var filledpost = null; var val = 0; for (k = 0; k < board.length; k++) { val += ( isempty(k) ? 1 : 0 ); if (!isempty(k)) filledpost = k; } if (val == 2 && isempty(startpost)) { message("Du hast gewonnen!", forceMsg); game_is_over = true; endpost = filledpost; } return game_is_over; } // // Animation functions // function Animation() { this.imageNum = new Array(); // Array of indicies document.images to be changed this.imageSrc = new Array(); // Array of new srcs for imageNum array this.frameIndex = 0; // the frame to play next this.alreadyPlaying = false; // semaphore to ensure we play smoothly this.getFrameCount = getframecount; // the total numebr of frame so far this.moreFrames = moreframes; // tells us if there are more frames to play this.addFrame = addframe; // add a frame to the animation this.drawNextFrame = drawnextframe; // draws the next frame this.startAnimation = startanimation; // start the animation if necessary } function getframecount() { return this.imageNum.length; } function moreframes() { return this.frameIndex < this.getFrameCount(); } function startanimation() { if (!this.alreadyPlaying) { theAnim.alreadyPlaying = true; setTimeout('theAnim.drawNextFrame()',5); } } function addframe(num, src) { var theIndex = theAnim.imageNum.length; theAnim.imageSrc[theIndex] = src; theAnim.imageNum[theIndex] = num; theAnim.startAnimation(); } function drawnextframe() { if (theAnim.moreFrames()) { document.images[ theAnim.imageNum[theAnim.frameIndex] ].src = theAnim.imageSrc[theAnim.frameIndex]; theAnim.frameIndex++; setTimeout('theAnim.drawNextFrame()', 30); } else { theAnim.alreadyPlaying = false; } } drawboard(); var theAnim = new Animation(); message("Versuche den Stapel Scheiben auf einen anderen Pfahl zu legen."); document.disp.message.value = ""; // End -->
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