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connect-four.html
514 lines (454 loc) · 12.5 KB
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connect-four.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width" />
<script src="https://rawgit.com/Canop/hu.js/master/hu.js"></script>
<style >
body {
margin: 0;
text-align: center;
}
input[type=number] {
width: 30px
}
</style>
</head>
<body>
<p>Search depth: <input id=depthInput type=number value=5 title="depth>4 is slow..."></p>
<script>
// Connect Four
// without a bitboard
var m=7, n=6; // m rows (which are the vertical columns) each of them with n elements
var match=null;
if ((match=location.hash.match(/^#(\d+)x(\d+)$/))!=null){
m=+match[1]
n=+match[2]
}
var root;
init()
function expand(node, maxDepth){
if (node.depth >= maxDepth ||!node.stats) return
for (var i = 0; i < m; i++) {
if(node.colsLevels[i]>=0){
var child={grid:copy(node.grid), colsLevels:node.colsLevels.slice(),
stats:{blue:{g:copy2(node.stats.blue.g),c:node.stats.blue.c.slice()},red:{g:copy2(node.stats.red.g),c:node.stats.red.c.slice()}}, depth:node.depth+1, isBlue:node.depth?!node.isBlue:node.isBlue, parent:node, children:[]}
update(child, i);
node.children[i] = child;
if(child&&child.stats.blue.c[4]===0&&child.stats.red.c[4]===0) expand(child, maxDepth)
}
}
}
function minimax(node){ // http://jsbin.com/bacoro/1/edit?js,output
if (!node) // invalid node, column is full
return NaN
else if (!node.children || !node.children.length)
node.score = score(node) // basic score
else{
var isMaximizer = node.depth==0?node.isBlue:!node.isBlue;
node.isMaximizer = isMaximizer;
for(var child of node.children){
// check if we need to see next child
// node.score is the current score being updated after each child visit, and it serves as a bound for pruning
if(node.parent && node.parent.score && (isMaximizer && node.score>node.parent.score || !isMaximizer && node.score<node.parent.score)){
//we don't need to explore other children = pruning
//console.log('pruning from', node)
break;
}else {
var s = minimax(child)
if(!isNaN(s)){
if (node.score!==undefined){
if (isMaximizer)
node.score=Math.max(node.score, s)
else
node.score=Math.min(node.score, s)
}else
node.score=s
}
}
}
}
return node.score
}
function score(node){
//if (!node) return NaN; // invalid node, column is full
var blue = node.stats.blue.c, red = node.stats.red.c;
return 1*blue[0]+4*blue[1]+5*blue[2]+10*blue[3]+(blue[4]?Infinity:0)
- (1*red[0]+4*red[1]+5*red[2]+10*red[3]+(red[4]?Infinity:0))
}
function update(node, i){//drop a disc in ith column
var j=node.colsLevels[i]--;
node.grid[i][j] = node.isBlue;
var mdirs = mydirs(node.grid,i,j);
var me = node.stats[node.isBlue?'blue':'red'],
op = node.stats[!node.isBlue?'blue':'red'];
if(mdirs[0].length>=4 || mdirs[1].length>=4 || mdirs[2].length>=4 || mdirs[3].length>=4){
me.c[4]=1;
return j;
}
for (var k=0;k< mdirs.length; k++){
var x=mdirs[k]
if(x.length==3){
var x1 = [2*x[0][0]-x[1][0],2*x[0][1]-x[1][1]],
x2 = [2*x[2][0]-x[1][0],2*x[2][1]-x[1][1]];
if (node.grid[x1[0]][x1[1]]===0 && node.grid[x2[0]][x2[1]]===0)
me.c[3]++;
else if(node.grid[x1[0]][x1[1]]===0 || node.grid[x2[0]][x2[1]]===0)// at least one free end
me.c[2]++;
if(_[i][j]==x[0]){
if (remRow(me.g, x[1], x[2]))
(node.grid[x2[0]][x2[1]]===0)?me.c[1]--:me.c[0]--;
}else if(_[i][j]==x[2]){
if (remRow(me.g, x[0], x[1]))
(node.grid[x1[0]][x1[1]]===0)?me.c[1]--:me.c[0]--;
}
if(node.grid[x1[0]][x1[1]]===0 || node.grid[x2[0]][x2[1]]===0)
addRow(me.g, x[0], x[2]);
}else if(x.length==2){
var x1 = [2*x[0][0]-x[1][0],2*x[0][1]-x[1][1]],
x2 = [2*x[1][0]-x[0][0],2*x[1][1]-x[0][1]];
if (node.grid[x1[0]][x1[1]]===0 && node.grid[x2[0]][x2[1]]===0)
me.c[1]++;
else if (node.grid[x1[0]][x1[1]]===0 || node.grid[x2[0]][x2[1]]===0) // at least one free end
me.c[0]++;
if (node.grid[x1[0]][x1[1]]===0 || node.grid[x2[0]][x2[1]]===0)
addRow(me.g, x[0], x[1]);
}
}
var odirs = oppDirs(node.grid,i,j);
for(var x of odirs){
if(x.length===3){
var x2=[2*x[2][0]-x[1][0],2*x[2][1]-x[1][1]];
if (node.grid[x2[0]][x2[1]]===0){
op.c[3]--;
op.c[2]++;
}else{
remRow(op.g, x[0], x[2])
op.c[2]--;
}
}else if(x.length===2){
var x2=[2*x[1][0]-x[0][0],2*x[1][1]-x[0][1]];
if (node.grid[x2[0]][x2[1]]===0){
op.c[1]--;
op.c[0]++;
}else{
remRow(op.g, x[0], x[1])
op.c[0]--;
}
}
}
return j;
}
function addRow(grid,a1,a2){
grid[a1[0]][a1[1]].push(a2);
grid[a2[0]][a2[1]].push(a1);
}
function remRow(grid,a1,a2){
var i1=grid[a1[0]][a1[1]].indexOf(a2),
i2=grid[a2[0]][a2[1]].indexOf(a1);
if (i1>=0) grid[a1[0]][a1[1]].splice(i1,1);
if (i2>=0) grid[a2[0]][a2[1]].splice(i2,1);
return i1>=0 && i2>=0
}
function mydirs(grid, i, j){
var r=[[],[],[],[]]
if(grid[i][j]===grid[i-1][j-1]){
if(grid[i][j]===grid[i-2][j-2]){
if(grid[i][j]===grid[i-3][j-3])
r[0].push(_[i-3][j-3]);
r[0].push(_[i-2][j-2]);
}
r[0].push(_[i-1][j-1])
}
r[0].push(_[i][j])
if(grid[i][j]===grid[i+1][j+1]){
r[0].push(_[i+1][j+1])
if(grid[i][j]===grid[i+2][j+2]){
r[0].push(_[i+2][j+2]);
if(grid[i][j]===grid[i+3][j+3])
r[0].push(_[i+3][j+3])
}
}
if(grid[i][j]===grid[i-1][j+1]){
if(grid[i][j]===grid[i-2][j+2]){
if(grid[i][j]===grid[i-3][j+3])
r[1].push(_[i-3][j+3])
r[1].push(_[i-2][j+2]);
}
r[1].push(_[i-1][j+1])
}
r[1].push(_[i][j])
if(grid[i][j]===grid[i+1][j-1]){
r[1].push(_[i+1][j-1])
if(grid[i][j]===grid[i+2][j-2]){
r[1].push(_[i+2][j-2]);
if(grid[i][j]===grid[i+3][j-3])
r[1].push(_[i+3][j-3])
}
}
if(grid[i][j]===grid[i-1][j]){
if(grid[i][j]===grid[i-2][j]){
if(grid[i][j]===grid[i-3][j])
r[2].push(_[i-3][j])
r[2].push(_[i-2][j]);
}
r[2].push(_[i-1][j])
}
r[2].push(_[i][j])
if(grid[i][j]===grid[i+1][j]){
r[2].push(_[i+1][j])
if(grid[i][j]===grid[i+2][j]){
r[2].push(_[i+2][j]);
if(grid[i][j]===grid[i+3][j])
r[2].push(_[i+3][j])
}
}
r[3]=[_[i][j]]
if(grid[i][j]===grid[i][j+1]){
r[3].push(_[i][j+1])
if(grid[i][j]===grid[i][j+2]){
r[3].push(_[i][j+2]);
if(grid[i][j]===grid[i][j+3])
r[3].push(_[i][j+3])
}
}
return r
}
function dist2(a,b){
return Math.pow(a[0]-b[0],2)+Math.pow(a[1]-b[1],2)
}
function oppDirs(grid, i, j){
var r=[[],[],[],[],[],[],[]];
if(!grid[i][j]===grid[i-1][j-1]){
r[0].push(_[i-1][j-1])
if(!grid[i][j]===grid[i-2][j-2]){
r[0].push(_[i-2][j-2]);
if(!grid[i][j]===grid[i-3][j-3])
r[0].push(_[i-3][j-3]);
}
}
if(!grid[i][j]===grid[i+1][j+1]){
r[1].push(_[i+1][j+1])
if(!grid[i][j]===grid[i+2][j+2]){
r[1].push(_[i+2][j+2]);
if(!grid[i][j]===grid[i+3][j+3])
r[1].push(_[i+3][j+3])
}
}
if(!grid[i][j]===grid[i-1][j+1]){
r[2].push(_[i-1][j+1])
if(!grid[i][j]===grid[i-2][j+2]){
r[2].push(_[i-2][j+2]);
if(!grid[i][j]===grid[i-3][j+3])
r[2].push(_[i-3][j+3])
}
}
if(!grid[i][j]===grid[i+1][j-1]){
r[3].push(_[i+1][j-1])
if(!grid[i][j]===grid[i+2][j-2]){
r[3].push(_[i+2][j-2]);
if(!grid[i][j]===grid[i+3][j-3])
r[3].push(_[i+3][j-3])
}
}
if(!grid[i][j]===grid[i-1][j]){
r[4].push(_[i-1][j])
if(!grid[i][j]===grid[i-2][j]){
r[4].push(_[i-2][j]);
if(!grid[i][j]===grid[i-3][j])
r[4].push(_[i-3][j])
}
}
if(!grid[i][j]===grid[i+1][j]){
r[5].push(_[i+1][j])
if(!grid[i][j]===grid[i+2][j]){
r[5].push(_[i+2][j]);
if(!grid[i][j]===grid[i+3][j])
r[5].push(_[i+3][j])
}
}
if(!grid[i][j]===grid[i][j+1]){
r[6].push(_[i][j+1])
if(!grid[i][j]===grid[i][j+2]){
r[6].push(_[i][j+2]);
if(!grid[i][j]===grid[i][j+3])
r[6].push(_[i][j+3])
}
}
return r;
}
/*
function neighbors(i,j){
var r=[];
if(i>0){
if(j>0) r[0] = [i-1,j-1];
r[1] = [i-1,j];
if(j<n-1) r[2] = [i-1,j+1];
}
if(j<n-1) r[3] = [i,j+1];
if(i<m-1){
if(j<n-1) r[4] = [i+1,j+1];
r[5] = [i+1,j];
if(j>0) r[6] = [i+1,j-1];
}
return r;
}*/
function copy(somegrid){
var newgrid=_copy(somegrid);
overflow(newgrid)
return newgrid;
}
function _copy(somegrid){
var newgrid=[];
for(var i=0; i<somegrid.length;i++){
newgrid[i] = somegrid[i].slice()
}
return newgrid;
}
function copy2(somegrid){
var newgrid=[];
for(var i=0; i<somegrid.length;i++){
newgrid[i] = _copy(somegrid[i])
}
return newgrid;
}
function overflow(somegrid){
somegrid[-1]=somegrid[-2]=somegrid[-3]=somegrid[m]=somegrid[m+1]=somegrid[m+2]=[];
}
function initialize0(somegrid){
for (var i=0;i<m;i++){
somegrid[i]=[];
for (var j=0;j<n;j++){
somegrid[i][j]=0
}
}
}
function initialize(somegrid, val){
for (var i=0;i<m;i++){
somegrid[i]=[];
for (var j=0;j<n;j++){
somegrid[i][j]=[]
}
}
}
function init(){
root={isBlue:true, grid:[], stats:{blue:{g:[],c:[0,0,0,0,0]},red:{g:[],c:[0,0,0,0,0]}}/*blue and red stats*/, colsLevels:[], depth:0, children:[]}
for (var i=0;i<m;i++)
root.colsLevels[i]=n-1;
initialize0(root.grid)
overflow(root.grid)
initialize(root.stats.blue.g)
initialize(root.stats.red.g)
for (var d of document.querySelectorAll('.disc'))
ù(d).remove()
}
var svg = ù('<svg>', 'body').css({
width:(100+m*30)+'px', height:(150+n*30)+'px'
})
var gradRed = svg.def('<linearGradient>').attr({
x1:0, y1:0, x2:1, y2:1
}).stops(
{offset:'0%', stopColor:'Tomato', stopOpacity:0.4},
{offset:'80%', stopColor:'Coral', stopOpacity:0.8}
);
var gradBlue = svg.def('<linearGradient>').attr({
x1:0, y1:0, x2:1, y2:1
}).stops(
{offset:'0%', stopColor:'CornflowerBlue', stopOpacity:0.4},
{offset:'80%', stopColor:'CadetBlue', stopOpacity:0.8}
);
var turnIndicator=ù('<circle>', svg).attr({fill:root.isBlue?gradBlue:gradRed, r:14, cx:20, cy:100+n*30-15})
.on('click', function(){
var i=predict(+depthInput.value)
console.log('pred',i, root.children.map(function(c){return c.score}))
})
ù('<text>', svg).attr({x:5, y:100+n*30-35})
.css({fontSize:'14px', fill:'black'})
.text("turn:");
ù('<text>', svg).attr({x:70, y:80, fillOpacity:0.1})
.css({fontSize:'30px', fill:'black'})
.text("click to drop");
for (var i=0;i<m;i++){// drop in zones
ù('<line>', svg).attr({
x1:65+i*30, y1:50, x2:65+i*30, y2:85,
stroke:'lightgray', strokeOpacity:0, i: i,
strokeWidth:28, strokeLinecap:'round'
}).on('click', function(){
var el = ù(this), i = +el.attr('i');
if(root.isBlue && root.colsLevels[i]>=0) {
var j=update(root, i);
console.log('stats', root.stats.blue.c, root.stats.red.c)
ù('<circle>', svg).attr({fill:root.isBlue?gradBlue:gradRed, r:14, cx:65+i*30, cy:100+15, class: 'disc'})
.animate({strokeOpacity:0, cy:100+j*30+15}, 180);
if (root.stats[root.isBlue?'blue':'red'].c[4]>0){
show('You win!')
return
}
root.isBlue = !root.isBlue;
turnIndicator.attr('fill', root.isBlue?gradBlue:gradRed);
setTimeout(function(){
var i=predict(+depthInput.value);
if(root.children[i].score===Infinity){
i=predict(1)
}
var j=update(root, i)
console.log('stats op', root.stats.blue.c, root.stats.red.c, root.children.map(function(c){return c.score}))
ù('<circle>', svg).attr({fill:root.isBlue?gradBlue:gradRed, r:14, cx:65+i*30, cy:100+15, class: 'disc'})
.animate({strokeOpacity:0, cy:100+j*30+15}, 180);
if (root.stats[root.isBlue?'blue':'red'].c[4]>0)
show('You lost :(')
root.isBlue = !root.isBlue;
turnIndicator.attr('fill', root.isBlue?gradBlue:gradRed);
},200)
}
})
}
for (var i=0;i<=m;i++){ // vertical lines
ù('<line>', svg).attr({
x1:50+i*30, y1: 100, x2:50+i*30, y2:100+n*30,
stroke:'#000000', strokeOpacity:1,
strokeWidth:1, strokeLinecap:'round'
})
}
for (var j=0;j<=n;j++){ // hor lines
ù('<line>', svg).attr({
x1:50, y1:100+j*30, x2:50+m*30, y2:100+j*30,
stroke:'#000000', strokeOpacity:1,
strokeWidth:1, strokeLinecap:'round'
})
}
var _=[];
for (var i=0; i<m; i++){
_[i]=[]
for(var j=0;j<n;j++)
_[i][j]=[i,j];
}
overflow(_)
function predict(depth){
root.children=[];
root.score=undefined;
expand(root, depth);
var s=minimax(root);
var best=root.children.map(function(c,i){return i}).filter(function(i){return root.children[i].score===s})
/*var mn=[-Infinity,-1]
for (var i=0;i<root.children.length; i++){
var s=minimax(root.children[i])
if(s>mn[0]) mn=[s,i]
}*/
return best[Math.floor(best.length*Math.random())]
}
function show(winner){
var overlay = ù('<svg>', svg).css({
position:'fixed', left:0, top:0, width:'100%', height:'100%'
}).on('click', function(){
init()
ù(this).remove()
});
ù('<text>', overlay).attr({x:-70+m*30/2, y:90+n*30/2})
.css({fontSize:'60px', fill:'black'})
.text(winner)
//.animate({strokeOpacity:0}, 5000, ù.remove);
}
</script>
</body>
</html>