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Towers of Hanoi

See how you do in this wonderful game of skill and logic. Try to move all the disks onto another pole. Thing is, you can only move one disk at a time and you must follow size order (a bigger disk can't go on a smaller disk). Good luck!


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<SCRIPT LANGUAGE="JavaScript"> <!-- Original: Adam Stock (adam@digital-biz.com) --> <!-- Begin <!-- STEP TWO: Save these images to your website server directory --> // http://www.yourdomain.com/hanoi-img-directory/disk1.gif // http://www.yourdomain.com/hanoi-img-directory/disk1h.gif // http://www.yourdomain.com/hanoi-img-directory/disk2.gif // http://www.yourdomain.com/hanoi-img-directory/disk2h.gif // http://www.yourdomain.com/hanoi-img-directory/disk3.gif // http://www.yourdomain.com/hanoi-img-directory/disk3h.gif // http://www.yourdomain.com/hanoi-img-directory/disk4.gif // http://www.yourdomain.com/hanoi-img-directory/disk4h.gif // http://www.yourdomain.com/hanoi-img-directory/disk5.gif // http://www.yourdomain.com/hanoi-img-directory/disk5h.gif // http://www.yourdomain.com/hanoi-img-directory/disk6.gif // http://www.yourdomain.com/hanoi-img-directory/disk6h.gif // http://www.yourdomain.com/hanoi-img-directory/disk7.gif // http://www.yourdomain.com/hanoi-img-directory/disk7h.gif // http://www.yourdomain.com/hanoi-img-directory/post.gif // http://www.yourdomain.com/hanoi-img-directory/posttop.gif // change this to where you upload the images to your site imgdir = "http://www.your-site.com/images/your-hanoi-image-directory/"; 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","pole.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("You may begin! Select a piece to move."); } 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("<h2>The Towers of Hanoi</h2><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></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><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></textarea><br>" + "Disks: <select name=\"disc\" size=1><option>3<option>4<option>5<option>6<option selected>7</select><input " +"type=button value=\"Start the Game Over\" onClick=\"restart(startpost);\"><input " +"type=button value=\"Solve It!\" onClick=\"restart(startpost);setTimeout('hanoi(disks,startpost,endpost)',300)\"></form>"); } 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("Select a piece to move."); return; } if (!ispost(i,j)) { toggle(j); return; }; if (ispost(i,j) && selectedc == j) { message("Move the piece to a different post."); return; } if (!legalmove(j)) { message("That is not a legal move. Try again."); 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("Select a piece to move."); 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("Click on the post to which you want to move the disk."); } 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("Select a piece to move."); 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("You won!", 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("You may begin! Select a piece to move."); document.disp.message.value = ""; // End --> </script>

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