github-games/inde.html at main · githubschool/github-games · GitHub

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<!DOCTYPE html>
<html>
<head>
<title>Javascript Tetris</title>
<style>
body { font-family: Helvetica, sans-serif; }
#tetris { margin:1em auto; padding:1em; border:4px solid black; border-radius:10px; background-color:#F8F8F8; }
#stats { display: inline-block; vertical-align: top; }
#canvas { display: inline-block; vertical-align: top; background:url(texture.jpg); box-shadow:10px10px10px#999; border:2px solid #333; }
#menu { display: inline-block; vertical-align: top; position: relative; }
#menup { margin:0.5em0; text-align: center; }
#menupa { text-decoration: none; color: black; }
#upcoming { display: block; margin:0 auto; background-color:#E0E0E0; }
#score { color: blue; font-weight: bold; vertical-align: middle; }
#rows { color: blue; font-weight: bold; vertical-align: middle; }
#stats { position: absolute; bottom:0em; right:1em; }
@media screen and (min-width:0px) and (min-height:0px) { #tetris { font-size:0.75em; width:250px; } #menu { width:100px; height:200px; } #upcoming { width:50px; height:50px; } #canvas { width:100px; height:200px; } } /* 10px chunks */
@media screen and (min-width:400px) and (min-height:400px) { #tetris { font-size:1.00em; width:350px; } #menu { width:150px; height:300px; } #upcoming { width:75px; height:75px; } #canvas { width:150px; height:300px; } } /* 15px chunks */
@media screen and (min-width:500px) and (min-height:500px) { #tetris { font-size:1.25em; width:450px; } #menu { width:200px; height:400px; } #upcoming { width:100px; height:100px; } #canvas { width:200px; height:400px; } } /* 20px chunks */
@media screen and (min-width:600px) and (min-height:600px) { #tetris { font-size:1.50em; width:550px; } #menu { width:250px; height:500px; } #upcoming { width:125px; height:125px; } #canvas { width:250px; height:500px; } } /* 25px chunks */
@media screen and (min-width:700px) and (min-height:700px) { #tetris { font-size:1.75em; width:650px; } #menu { width:300px; height:600px; } #upcoming { width:150px; height:150px; } #canvas { width:300px; height:600px; } } /* 30px chunks */
@media screen and (min-width:800px) and (min-height:800px) { #tetris { font-size:2.00em; width:750px; } #menu { width:350px; height:700px; } #upcoming { width:175px; height:175px; } #canvas { width:350px; height:700px; } } /* 35px chunks */
@media screen and (min-width:900px) and (min-height:900px) { #tetris { font-size:2.25em; width:850px; } #menu { width:400px; height:800px; } #upcoming { width:200px; height:200px; } #canvas { width:400px; height:800px; } } /* 40px chunks */
</style>
</head>

<body>

<divid="tetris">
<divid="menu">
<pid="start"><ahref="javascript:play();">Press Space to Play.</a></p>
<p><canvasid="upcoming"></canvas></p>
<p>score <spanid="score">00000</span></p>
<p>rows <spanid="rows">0</span></p>
</div>
<canvasid="canvas">
 Sorry, this example cannot be run because your browser does not support the &lt;canvas&gt; element
</canvas>
</div>

<scriptsrc="stats.js"></script>
<script>

//-------------------------------------------------------------------------
// base helper methods
//-------------------------------------------------------------------------

functionget(id){returndocument.getElementById(id);}
functionhide(id){get(id).style.visibility='hidden';}
functionshow(id){get(id).style.visibility=null;}
functionhtml(id,html){get(id).innerHTML=html;}

functiontimestamp(){returnnewDate().getTime();}
functionrandom(min,max){return(min+(Math.random()*(max-min)));}
functionrandomChoice(choices){returnchoices[Math.round(random(0,choices.length-1))];}

if(!window.requestAnimationFrame){// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
window.requestAnimationFrame=window.webkitRequestAnimationFrame||
window.mozRequestAnimationFrame||
window.oRequestAnimationFrame||
window.msRequestAnimationFrame||
function(callback,element){
window.setTimeout(callback,1000/60);
}
}

//-------------------------------------------------------------------------
// game constants
//-------------------------------------------------------------------------

varKEY={ESC: 27,SPACE: 32,LEFT: 37,UP: 38,RIGHT: 39,DOWN: 40},
DIR={UP: 0,RIGHT: 1,DOWN: 2,LEFT: 3,MIN: 0,MAX: 3},
stats=newStats(),
canvas=get('canvas'),
ctx=canvas.getContext('2d'),
ucanvas=get('upcoming'),
uctx=ucanvas.getContext('2d'),
speed={start: 0.6,decrement: 0.005,min: 0.1},// how long before piece drops by 1 row (seconds)
nx=10,// width of tetris court (in blocks)
ny=20,// height of tetris court (in blocks)
nu=5;// width/height of upcoming preview (in blocks)

//-------------------------------------------------------------------------
// game variables (initialized during reset)
//-------------------------------------------------------------------------

vardx,dy,// pixel size of a single tetris block
blocks,// 2 dimensional array (nx*ny) representing tetris court - either empty block or occupied by a 'piece'
actions,// queue of user actions (inputs)
playing,// true|false - game is in progress
paused,// true|false - game is currently paued (to differentiate need for reset)
dt,// time since starting this game
current,// the current piece
next,// the next piece
score,// the current score
vscore,// the currently displayed score (it catches up to score in small chunks - like a spinning slot machine)
rows,// number of completed rows in the current game
step;// how long before current piece drops by 1 row

//-------------------------------------------------------------------------
// tetris pieces
//
// blocks: each element represents a rotation of the piece (0, 90, 180, 270)
// each element is a 16 bit integer where the 16 bits represent
// a 4x4 set of blocks, e.g. j.blocks[0] = 0x44C0
//
// 0100 = 0x4 << 3 = 0x4000
// 0100 = 0x4 << 2 = 0x0400
// 1100 = 0xC << 1 = 0x00C0
// 0000 = 0x0 << 0 = 0x0000
// ------
// 0x44C0
//
//-------------------------------------------------------------------------

vari={size: 4,blocks: [0x0F00,0x2222,0x00F0,0x4444],color: 'purple'};
varj={size: 3,blocks: [0x44C0,0x8E00,0x6440,0x0E20],color: 'pink'};
varl={size: 3,blocks: [0x4460,0x0E80,0xC440,0x2E00],color: 'salmon'};
varo={size: 2,blocks: [0xCC00,0xCC00,0xCC00,0xCC00],color: 'lime'};
vars={size: 3,blocks: [0x06C0,0x8C40,0x6C00,0x4620],color: 'teal'};
vart={size: 3,blocks: [0x0E40,0x4C40,0x4E00,0x4640],color: 'coral'};
varz={size: 3,blocks: [0x0C60,0x4C80,0xC600,0x2640],color: 'olive'};

//------------------------------------------------
// do the bit manipulation and iterate through each
// occupied block (x,y) for a given piece
//------------------------------------------------
functioneachblock(type,x,y,dir,fn){
varbit,result,row=0,col=0,blocks=type.blocks[dir];
for(bit=0x8000;bit>0;bit=bit>>1){
if(blocks&bit){
fn(x+col,y+row);
}
if(++col===4){
col=0;
++row;
}
}
}

//-----------------------------------------------------
// check if a piece can fit into a position in the grid
//-----------------------------------------------------
functionoccupied(type,x,y,dir){
varresult=false
eachblock(type,x,y,dir,function(x,y){
if((x<0)||(x>=nx)||(y<0)||(y>=ny)||getBlock(x,y))
result=true;
});
returnresult;
}

functionunoccupied(type,x,y,dir){
return!occupied(type,x,y,dir);
}

//-----------------------------------------
// start with 4 instances of each piece and
// pick randomly until the 'bag is empty'
//-----------------------------------------
varpieces=[];
functionrandomPiece(){
if(pieces.length==0)
pieces=[i,i,i,i,j,j,j,j,l,l,l,l,o,o,o,o,s,s,s,s,t,t,t,t,z,z,z,z];
vartype=pieces.splice(random(0,pieces.length-1),1)[0];
return{type: type,dir: DIR.UP,x: Math.round(random(0,nx-type.size)),y: 0};
}


//-------------------------------------------------------------------------
// GAME LOOP
//-------------------------------------------------------------------------

functionrun(){

showStats();// initialize FPS counter
addEvents();// attach keydown and resize events

varlast=now=timestamp();
functionframe(){
now=timestamp();
update(Math.min(1,(now-last)/1000.0));// using requestAnimationFrame have to be able to handle large delta's caused when it 'hibernates' in a background or non-visible tab
draw();
stats.update();
last=now;
requestAnimationFrame(frame,canvas);
}

resize();// setup all our sizing information
reset();// reset the per-game variables
frame();// start the first frame

}

functionshowStats(){
stats.domElement.id='stats';
get('menu').appendChild(stats.domElement);
}

functionaddEvents(){
document.addEventListener('keydown',keydown,false);
window.addEventListener('resize',resize,false);
}

functionresize(event){
canvas.width=canvas.clientWidth;// set canvas logical size equal to its physical size
canvas.height=canvas.clientHeight;// (ditto)
ucanvas.width=ucanvas.clientWidth;
ucanvas.height=ucanvas.clientHeight;
dx=canvas.width/nx;// pixel size of a single tetris block
dy=canvas.height/ny;// (ditto)
invalidate();
invalidateNext();
}

functionkeydown(ev){
varhandled=false;
if(playing){
switch(ev.keyCode){
caseKEY.LEFT: actions.push(DIR.LEFT);handled=true;break;
caseKEY.RIGHT: actions.push(DIR.RIGHT);handled=true;break;
caseKEY.UP: actions.push(DIR.UP);handled=true;break;
caseKEY.DOWN: actions.push(DIR.DOWN);handled=true;break;
caseKEY.ESC: lose();handled=true;break;
caseKEY.SPACE: pause();handled=true;break;
}
}
elseif(ev.keyCode==KEY.SPACE){
if(paused){
restart();
handled=true;
}else{
play();
handled=true;
}
}
if(handled)
ev.preventDefault();// prevent arrow keys from scrolling the page (supported in IE9+ and all other browsers)
}

//-------------------------------------------------------------------------
// GAME LOGIC
//-------------------------------------------------------------------------

functionplay(){hide('start');reset();paused=false;playing=true;}
functionpause(){show('start');paused=true;playing=false;}
functionrestart(){hide('start');paused=false;playing=true;}
functionlose(){show('start');setVisualScore();playing=false;}

functionsetVisualScore(n){vscore=n||score;invalidateScore();}
functionsetScore(n){score=n;setVisualScore(n);}
functionaddScore(n){score=score+n;}
functionclearScore(){setScore(0);}
functionclearRows(){setRows(0);}
functionsetRows(n){rows=n;step=Math.max(speed.min,speed.start-(speed.decrement*rows));invalidateRows();}
functionaddRows(n){setRows(rows+n);}
functiongetBlock(x,y){return(blocks&&blocks[x] ? blocks[x][y] : null);}
functionsetBlock(x,y,type){blocks[x]=blocks[x]||[];blocks[x][y]=type;invalidate();}
functionclearBlocks(){blocks=[];invalidate();}
functionclearActions(){actions=[];}
functionsetCurrentPiece(piece){current=piece||randomPiece();invalidate();}
functionsetNextPiece(piece){next=piece||randomPiece();invalidateNext();}

functionreset(){
dt=0;
clearActions();
clearBlocks();
clearRows();
clearScore();
setCurrentPiece(next);
setNextPiece();
}

functionupdate(idt){
if(playing){
if(vscore<score)
setVisualScore(vscore+1);
handle(actions.shift());
dt=dt+idt;
if(dt>step){
dt=dt-step;
drop();
}
}
}

functionhandle(action){
switch(action){
caseDIR.LEFT: move(DIR.LEFT);break;
caseDIR.RIGHT: move(DIR.RIGHT);break;
caseDIR.UP: rotate();break;
caseDIR.DOWN: drop();break;
}
}

functionmove(dir){
varx=current.x,y=current.y;
switch(dir){
caseDIR.RIGHT: x=x+1;break;
caseDIR.LEFT: x=x-1;break;
caseDIR.DOWN: y=y+1;break;
}
if(unoccupied(current.type,x,y,current.dir)){
current.x=x;
current.y=y;
invalidate();
returntrue;
}
else{
returnfalse;
}
}

functionrotate(){
varnewdir=(current.dir==DIR.MAX ? DIR.MIN : current.dir+1);
if(unoccupied(current.type,current.x,current.y,newdir)){
current.dir=newdir;
invalidate();
}
}

functiondrop(){
if(!move(DIR.DOWN)){
addScore(10);
dropPiece();
removeLines();
setCurrentPiece(next);
setNextPiece(randomPiece());
clearActions();
if(occupied(current.type,current.x,current.y,current.dir)){
lose();
}
}
}

functiondropPiece(){
eachblock(current.type,current.x,current.y,current.dir,function(x,y){
setBlock(x,y,current.type);
});
}

functionremoveLines(){
varx,y,complete,n=0;
for(y=ny;y>0;--y){
complete=true;
for(x=0;x<nx;++x){
if(!getBlock(x,y))
complete=false;
}
if(complete){
removeLine(y);
y=y+1;// recheck same line
n++;
}
}
if(n>0){
addRows(n);
addScore(100*Math.pow(2,n-1));// 1: 100, 2: 200, 3: 400, 4: 800
}
}

functionremoveLine(n){
varx,y;
for(y=n;y>=0;--y){
for(x=0;x<nx;++x)
setBlock(x,y,(y==0) ? null : getBlock(x,y-1));
}
}

//-------------------------------------------------------------------------
// RENDERING
//-------------------------------------------------------------------------

varinvalid={};

functioninvalidate(){invalid.court=true;}
functioninvalidateNext(){invalid.next=true;}
functioninvalidateScore(){invalid.score=true;}
functioninvalidateRows(){invalid.rows=true;}

functiondraw(){
ctx.save();
ctx.lineWidth=1;
ctx.translate(0.5,0.5);// for crisp 1px black lines
drawCourt();
drawNext();
drawScore();
drawRows();
ctx.restore();
}

functiondrawCourt(){
if(invalid.court){
ctx.clearRect(0,0,canvas.width,canvas.height);
if(playing)
drawPiece(ctx,current.type,current.x,current.y,current.dir);
varx,y,block;
for(y=0;y<ny;y++){
for(x=0;x<nx;x++){
if(block=getBlock(x,y))
drawBlock(ctx,x,y,block.color);
}
}
ctx.strokeRect(0,0,nx*dx-1,ny*dy-1);// court boundary
invalid.court=false;
}
}

functiondrawNext(){
if(invalid.next){
varpadding=(nu-next.type.size)/2;// half-arsed attempt at centering next piece display
uctx.save();
uctx.translate(0.5,0.5);
uctx.clearRect(0,0,nu*dx,nu*dy);
drawPiece(uctx,next.type,padding,padding,next.dir);
uctx.strokeStyle='black';
uctx.strokeRect(0,0,nu*dx-1,nu*dy-1);
uctx.restore();
invalid.next=false;
}
}

functiondrawScore(){
if(invalid.score){
html('score',("00000"+Math.floor(vscore)).slice(-5));
invalid.score=false;
}
}

functiondrawRows(){
if(invalid.rows){
html('rows',rows);
invalid.rows=false;
}
}

functiondrawPiece(ctx,type,x,y,dir){
eachblock(type,x,y,dir,function(x,y){
drawBlock(ctx,x,y,type.color);
});
}

functiondrawBlock(ctx,x,y,color){
ctx.fillStyle=color;
ctx.fillRect(x*dx,y*dy,dx,dy);
ctx.strokeRect(x*dx,y*dy,dx,dy)
}

//-------------------------------------------------------------------------
// FINALLY, lets run the game
//-------------------------------------------------------------------------

run();

</script>

</body>
</html>