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tetris.html
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<!DOCTYPE html>
<html>
<head>
<title>Tetris</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.3/react-with-addons.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.3/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<style>
#grid-table {
border-collapse: collapse;
width: 350px;
height: 700px;
float: left;
margin-right: 20px;
}
#grid-table td {
border: 1px solid #aac;
}
#grid-table td.filled {
background-color: #228;
}
#next-shape-table {
border-collapse: collapse;
width: 105px;
height: 140px;
margin-top: 20px;
}
#next-shape-table td.filled {
background-color: #7c7;
}
#score {
font-size: 50px;
color: #ec2;
font-family: Impact, Charcoal, sans-serif;
}
#game-over {
font-size: 70px;
color: #498;
}
</style>
</head>
<body>
<div id="content">
</div>
<div style="margin-top: 20px">
<a href="https://github.com/maxim/js-fun/blob/gh-pages/tetris.html">
source code
</a>
</div>
<script type="text/jsx">
var Cell = React.createClass({
render: function() {
var cx = React.addons.classSet;
var classes = cx({
'filled': this.props.filled
});
return (
<td id={this.props.id} className={classes}>
</td>
)
}
});
var Row = React.createClass({
render: function() {
return (
<tr id={this.props.id}>
{this.props.cells}
</tr>
)
}
});
var Game = React.createClass({
pickRandomShape: function() {
return this.props.allShapes[
Math.floor(Math.random()*this.props.allShapes.length)
];
},
getInitialState: function() {
var bitmap = [];
for (var i = 0; i < 24; i++) {
var row = [];
for (var j = 0; j < 10; j++) {
row.push(false);
}
bitmap.push(row);
}
return {
bitmap: bitmap,
fallingShape: zShape,
nextShape: sShape,
fallingX: 4,
fallingY: 0,
score: 0
};
},
setShapeBits: function(bit) {
var updatedBitmap = this.state.bitmap.slice();
this.state.fallingShape.offsetCoords(
this.state.fallingX,
this.state.fallingY
).forEach(function(point) {
var finalX = point[0];
var finalY = point[1];
updatedBitmap[finalY][finalX] = bit;
});
this.setState({ bitmap: updatedBitmap });
},
drawShape: function() {
this.setShapeBits(true);
},
clearShape: function() {
this.setShapeBits(false);
},
clearRows: function() {
var rowsCleared = 0;
var updatedBitmap = this.state.bitmap.slice();
for (var i = 23; i > 0; i--) {
var rowFilled = updatedBitmap[i].every(function(bit) {
return bit;
});
if (rowFilled) {
rowsCleared++;
updatedBitmap.splice(i, 1);
updatedBitmap.unshift(
[false,false,false,false,false,false,false,false,false,false]
);
i++;
};
}
if (rowsCleared > 0) {
this.setState({
bitmap: updatedBitmap,
score: this.state.score + rowsCleared
});
}
},
isObstructionAt: function(x, y) {
return this.state.bitmap[y][x];
},
isWithinBounds: function(x, y) {
return (x >= 0 && x <= 9 && y >= 0 && y <= 23);
},
valueOrDefault: function(value, defaultValue) {
if (typeof value == 'undefined') {
return defaultValue;
} else {
return value;
}
},
isShapeLocationValid: function(shape, x, y) {
shape = this.valueOrDefault(shape, this.state.fallingShape);
x = this.valueOrDefault(x, this.state.fallingX);
y = this.valueOrDefault(y, this.state.fallingY);
return shape.offsetCoords(x, y).every(function(point) {
return (
this.isWithinBounds(point[0], point[1]) &&
!this.isObstructionAt(point[0], point[1])
)
}, this);
},
isDownObstructed: function(shape, x, y) {
shape = this.valueOrDefault(shape, this.state.fallingShape);
x = this.valueOrDefault(x, this.state.fallingX);
y = this.valueOrDefault(y, this.state.fallingY);
return !this.isShapeLocationValid(shape, x, y + 1);
},
isLeftObstructed: function(shape, x, y) {
shape = this.valueOrDefault(shape, this.state.fallingShape);
x = this.valueOrDefault(x, this.state.fallingX);
y = this.valueOrDefault(y, this.state.fallingY);
return !this.isShapeLocationValid(shape, x - 1, y);
},
isRightObstructed: function(shape, x, y) {
shape = this.valueOrDefault(shape, this.state.fallingShape);
x = this.valueOrDefault(x, this.state.fallingX);
y = this.valueOrDefault(y, this.state.fallingY);
return !this.isShapeLocationValid(shape, x + 1, y);
},
applyGravity: function() {
this.clearShape();
if (this.isDownObstructed()) {
this.drawShape();
this.clearRows();
this.dropRandomShape();
if (this.isDownObstructed()) {
clearInterval(this.state.intervalId);
this.setState({ lost: 'Finito!' });
}
} else {
this.setState({ fallingY: (this.state.fallingY + 1) });
this.drawShape();
}
},
moveShapeLeft: function() {
this.clearShape();
if (!this.isLeftObstructed()) {
this.setState({ fallingX: (this.state.fallingX - 1) });
}
this.drawShape();
},
moveShapeRight: function() {
this.clearShape();
if (!this.isRightObstructed()) {
this.setState({ fallingX: (this.state.fallingX + 1) });
}
this.drawShape();
},
rotateShape: function() {
var rotatedShape = this.state.fallingShape.buildRotated();
this.clearShape();
if (this.isShapeLocationValid(rotatedShape)) {
this.setState({ fallingShape: rotatedShape });
} else {
var newX = 0;
for (var i = 1; i < rotatedShape.width; i++) {
var attemptedX = this.state.fallingX - i;
if (this.isShapeLocationValid(rotatedShape, attemptedX)) {
newX = attemptedX;
break;
}
}
if (newX > 0) {
this.setState({
fallingShape: rotatedShape,
fallingX: newX
});
}
}
this.drawShape();
},
slamShape: function() {
this.clearShape();
var newY = 0;
for (var y = (this.state.fallingY + 1); y < 25; y++) {
var validLoc = this.isShapeLocationValid(
this.state.fallingShape,
this.state.fallingX,
y
);
if (!validLoc) {
newY = y - 1;
break;
}
}
if (newY > this.state.fallingY) {
this.setState({ fallingY: newY });
}
this.drawShape();
},
dropRandomShape: function() {
this.setState({
fallingShape: this.state.nextShape,
nextShape: this.pickRandomShape(),
fallingX: 4,
fallingY: (4 - this.state.nextShape.height)
});
},
componentDidMount: function() {
window.addEventListener('keydown', function (e) {
var intKey = (window.Event) ? e.which : e.keyCode;
switch(intKey) {
case 37:
this.moveShapeLeft();
break;
case 39:
this.moveShapeRight();
break;
case 38:
this.rotateShape();
break;
case 40:
this.slamShape();
break;
}
}.bind(this));
var shape = this.pickRandomShape();
var nextShape = this.pickRandomShape();
this.setState({
fallingShape: shape,
nextShape: nextShape,
fallingY: (4 - shape.height),
intervalId: setInterval(this.applyGravity, 300)
});
},
render: function() {
var rows = [];
var nextShapeRows = [];
for (var yCoord = 4; yCoord < 24; yCoord++) {
var cells = this.state.bitmap[yCoord].map(function(isFilled, xCoord){
var key = 'c' + yCoord + 'x' + xCoord;
return (
<Cell id={key} key={key} filled={isFilled} />
)
});
var key = 'r' + yCoord;
rows.push(
<Row cells={cells} key={key} id={key} />
)
}
for (var rowNum = 0; rowNum < 4; rowNum++) {
var cells = [];
for (var colNum = 0; colNum < 3; colNum++) {
var key = 'ns-r' + rowNum + 'c' + colNum;
row = this.state.nextShape.pattern[rowNum];
if (row && row[colNum] === 'x') {
cells.push(<Cell key={key} filled={true} />)
} else {
cells.push(<Cell key={key} filled={false} />)
}
}
var key = 'ns-r' + rowNum;
nextShapeRows.push(
<Row cells={cells} key={key} />
)
}
return (
<div id="game">
<table id="grid-table">
<tbody id="grid">
{rows}
</tbody>
</table>
<div id="score">
{this.state.score}
<div id="game-over">
{this.state.lost}
</div>
</div>
<table id="next-shape-table">
<tbody id="next-shape">
{nextShapeRows}
</tbody>
</table>
</div>
)
}
});
var Shape = function Shape(patterns, bitSets, orientation) {
this.patterns = patterns;
this.bitSets = bitSets || patterns.map(function(pattern) {
var coords = [];
pattern.forEach(function(line, yCoord) {
line.forEach(function(value, xCoord) {
if (value === 'x') {
coords.push([xCoord, yCoord]);
}
});
});
return coords;
});
this.dimensions = this.bitSets.map(function(coords) {
var maxX = 0;
var maxY = 0;
coords.forEach(function(point) {
if (point[0] > maxX) { maxX = point[0]; }
if (point[1] > maxY) { maxY = point[1]; }
});
return ([maxX + 1, maxY + 1]);
});
this.orientation = orientation || 0;
this.pattern = this.patterns[this.orientation];
this.bitSet = this.bitSets[this.orientation];
this.width = this.dimensions[this.orientation][0];
this.height = this.dimensions[this.orientation][1];
this.offsetCoords = function(x, y) {
return this.bitSet.map(function(point) {
return this.offsetPoint(point, x, y);
}, this);
}
this.offsetPoint = function(point, xOffset, yOffset) {
return ([point[0] + xOffset, point[1] + yOffset]);
}
this.buildRotated = function() {
var newOrientation = this.orientation + 1;
if (newOrientation > (this.bitSets.length - 1)) {
newOrientation = 0;
}
return new Shape(this.patterns, this.bitSets, newOrientation);
}
}
var oShape = new Shape(
[[ ['x', 'x'],
['x', 'x'] ]]
);
var iShape = new Shape(
[
[ ['x'],
['x'],
['x'],
['x'] ],
[['x', 'x', 'x', 'x']],
]
);
var sShape = new Shape(
[
[ [' ', 'x', 'x'],
['x', 'x'] ],
[ ['x'],
['x', 'x'],
[' ', 'x'] ]
]
);
var zShape = new Shape(
[
[ ['x', 'x'],
[' ', 'x', 'x'] ],
[ [' ', 'x'],
['x', 'x'],
['x'] ]
]
);
var lShape = new Shape(
[
[ ['x'],
['x'],
['x', 'x'] ],
[ ['x', 'x', 'x'],
['x'] ],
[ ['x', 'x'],
[' ', 'x'],
[' ', 'x'] ],
[ [' ', ' ', 'x'],
['x', 'x', 'x'] ]
]
);
var jShape = new Shape(
[
[ [' ', 'x'],
[' ', 'x'],
['x', 'x'] ],
[ ['x'],
['x', 'x', 'x'] ],
[ ['x', 'x'],
['x'],
['x'] ],
[ ['x', 'x', 'x'],
[' ', ' ', 'x'] ]
]
);
var tShape = new Shape(
[
[ ['x', 'x', 'x'],
[' ', 'x'] ],
[ [' ', 'x'],
['x', 'x'],
[' ', 'x'] ],
[ [' ', 'x'],
['x', 'x', 'x'] ],
[ ['x'],
['x', 'x'],
['x'] ]
]
);
function main() {
var allShapes = [
oShape, iShape, sShape, zShape, lShape, jShape, tShape
];
React.render(
<Game allShapes={allShapes} />,
document.getElementById('content')
);
}
$(main);
</script>
</body>
</html>