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index.html
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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: 10px 10px 10px #999;
border: 2px solid #333;
}
#menu {
display: inline-block;
vertical-align: top;
position: relative;
}
#menu p {
margin: 0.5em 0;
text-align: center;
}
#menu p a {
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: 1em;
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: 1.5em;
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: 2em;
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>
<div id="tetris">
<div id="menu">
<p id="start"><a href="javascript:play();">Press Space to Play.</a></p>
<p><canvas id="upcoming"></canvas></p>
<p>score <span id="score">00000</span></p>
<p>rows <span id="rows">0</span></p>
</div>
<canvas id="canvas">
Sorry, this example cannot be run because your browser does not support
the <canvas> element
</canvas>
</div>
<script src="stats.js"></script>
<script>
//-------------------------------------------------------------------------
// base helper methods
//-------------------------------------------------------------------------
function get(id) {
return document.getElementById(id);
}
function hide(id) {
get(id).style.visibility = "hidden";
}
function show(id) {
get(id).style.visibility = null;
}
function html(id, html) {
get(id).innerHTML = html;
}
function timestamp() {
return new Date().getTime();
}
function random(min, max) {
return min + Math.random() * (max - min);
}
function randomChoice(choices) {
return choices[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
//-------------------------------------------------------------------------
var KEY = { 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 = new Stats(),
canvas = get("canvas"),
ctx = canvas.getContext("2d"),
ucanvas = get("upcoming"),
uctx = ucanvas.getContext("2d"),
speed = { start: 0.6, decrement: 0.01, 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)
//-------------------------------------------------------------------------
var dx,
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
//
//-------------------------------------------------------------------------
var i = {
size: 4,
blocks: [0x0f00, 0x2222, 0x00f0, 0x4444],
color: "purple",
};
var j = {
size: 3,
blocks: [0x44c0, 0x8e00, 0x6440, 0x0e20],
color: "pink",
};
var l = {
size: 3,
blocks: [0x4460, 0x0e80, 0xc440, 0x2e00],
color: "salmon",
};
var o = {
size: 2,
blocks: [0xcc00, 0xcc00, 0xcc00, 0xcc00],
color: "lime",
};
var s = {
size: 3,
blocks: [0x06c0, 0x8c40, 0x6c00, 0x4620],
color: "teal",
};
var t = {
size: 3,
blocks: [0x0e40, 0x4c40, 0x4e00, 0x4640],
color: "coral",
};
var z = {
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
//------------------------------------------------
function eachblock(type, x, y, dir, fn) {
var bit,
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
//-----------------------------------------------------
function occupied(type, x, y, dir) {
var result = false;
eachblock(type, x, y, dir, function (x, y) {
if (x < 0 || x >= nx || y < 0 || y >= ny || getBlock(x, y))
result = true;
});
return result;
}
function unoccupied(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'
//-----------------------------------------
var pieces = [];
function randomPiece() {
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,
];
var type = 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
//-------------------------------------------------------------------------
function run() {
showStats(); // initialize FPS counter
addEvents(); // attach keydown and resize events
var last = (now = timestamp());
function frame() {
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
}
function showStats() {
stats.domElement.id = "stats";
get("menu").appendChild(stats.domElement);
}
function addEvents() {
document.addEventListener("keydown", keydown, false);
window.addEventListener("resize", resize, false);
}
function resize(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();
}
function keydown(ev) {
var handled = false;
if (playing) {
switch (ev.keyCode) {
case KEY.LEFT:
actions.push(DIR.LEFT);
handled = true;
break;
case KEY.RIGHT:
actions.push(DIR.RIGHT);
handled = true;
break;
case KEY.UP:
actions.push(DIR.UP);
handled = true;
break;
case KEY.DOWN:
actions.push(DIR.DOWN);
handled = true;
break;
case KEY.ESC:
lose();
handled = true;
break;
case KEY.SPACE:
pause();
handled = true;
break;
}
} else if (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
//-------------------------------------------------------------------------
function play() {
hide("start");
reset();
paused = false;
playing = true;
}
function pause() {
show("start");
paused = true;
playing = false;
}
function restart() {
hide("start");
paused = false;
playing = true;
}
function lose() {
show("start");
setVisualScore();
playing = false;
}
function setVisualScore(n) {
vscore = n || score;
invalidateScore();
}
function setScore(n) {
score = n;
setVisualScore(n);
}
function addScore(n) {
score = score + n;
}
function clearScore() {
setScore(0);
}
function clearRows() {
setRows(0);
}
function setRows(n) {
rows = n;
step = Math.max(speed.min, speed.start - speed.decrement * rows);
invalidateRows();
}
function addRows(n) {
setRows(rows + n);
}
function getBlock(x, y) {
return blocks && blocks[x] ? blocks[x][y] : null;
}
function setBlock(x, y, type) {
blocks[x] = blocks[x] || [];
blocks[x][y] = type;
invalidate();
}
function clearBlocks() {
blocks = [];
invalidate();
}
function clearActions() {
actions = [];
}
function setCurrentPiece(piece) {
current = piece || randomPiece();
invalidate();
}
function setNextPiece(piece) {
next = piece || randomPiece();
invalidateNext();
}
function reset() {
dt = 0;
clearActions();
clearBlocks();
clearRows();
clearScore();
setCurrentPiece(next);
setNextPiece();
}
function update(idt) {
if (playing) {
if (vscore < score) setVisualScore(vscore + 1);
handle(actions.shift());
dt = dt + idt;
if (dt > step) {
dt = dt - step;
drop();
}
}
}
function handle(action) {
switch (action) {
case DIR.LEFT:
move(DIR.LEFT);
break;
case DIR.RIGHT:
move(DIR.RIGHT);
break;
case DIR.UP:
rotate();
break;
case DIR.DOWN:
drop();
break;
}
}
function move(dir) {
var x = current.x,
y = current.y;
switch (dir) {
case DIR.RIGHT:
x = x + 1;
break;
case DIR.LEFT:
x = x - 1;
break;
case DIR.DOWN:
y = y + 1;
break;
}
if (unoccupied(current.type, x, y, current.dir)) {
current.x = x;
current.y = y;
invalidate();
return true;
} else {
return false;
}
}
function rotate() {
var newdir = current.dir == DIR.MAX ? DIR.MIN : current.dir + 1;
if (unoccupied(current.type, current.x, current.y, newdir)) {
current.dir = newdir;
invalidate();
}
}
function drop() {
if (!move(DIR.DOWN)) {
addScore(10);
dropPiece();
removeLines();
setCurrentPiece(next);
setNextPiece(randomPiece());
clearActions();
if (occupied(current.type, current.x, current.y, current.dir)) {
lose();
}
}
}
function dropPiece() {
eachblock(current.type, current.x, current.y, current.dir, function (
x,
y
) {
setBlock(x, y, current.type);
});
}
function removeLines() {
var x,
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
}
}
function removeLine(n) {
var x, y;
for (y = n; y >= 0; --y) {
for (x = 0; x < nx; ++x)
setBlock(x, y, y == 0 ? null : getBlock(x, y - 1));
}
}
//-------------------------------------------------------------------------
// RENDERING
//-------------------------------------------------------------------------
var invalid = {};
function invalidate() {
invalid.court = true;
}
function invalidateNext() {
invalid.next = true;
}
function invalidateScore() {
invalid.score = true;
}
function invalidateRows() {
invalid.rows = true;
}
function draw() {
ctx.save();
ctx.lineWidth = 1;
ctx.translate(0.5, 0.5); // for crisp 1px black lines
drawCourt();
drawNext();
drawScore();
drawRows();
ctx.restore();
}
function drawCourt() {
if (invalid.court) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (playing)
drawPiece(ctx, current.type, current.x, current.y, current.dir);
var x, 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;
}
}
function drawNext() {
if (invalid.next) {
var padding = (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;
}
}
function drawScore() {
if (invalid.score) {
html("score", ("00000" + Math.floor(vscore)).slice(-5));
invalid.score = false;
}
}
function drawRows() {
if (invalid.rows) {
html("rows", rows);
invalid.rows = false;
}
}
function drawPiece(ctx, type, x, y, dir) {
eachblock(type, x, y, dir, function (x, y) {
drawBlock(ctx, x, y, type.color);
});
}
function drawBlock(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>