贪吃蛇游戏代码
<!DOCTYPE html>
<html>
<head>
<style>
* {
box-sizing: border-box;
}
html,
body {
background-color: #000;
height: 100%;
}
body {
background: #222;
background: -webkit-radial-gradient(#333, #111);
background: radial-gradient(#333, #111);
background-position: center center;
background-repeat: no-repeat;
background-size: cover;
color: #fff;
font: 100%/1.5 sans-serif;
overflow: hidden;
}
/*================================================
Score
================================================*/
.score {
color: rgba(255, 255, 255, 0.5);
font-size: 16px;
font-weight: bold;
padding-top: 5px;
text-align: center;
}
/*================================================
Stage
================================================*/
.stage {
bottom: 0;
left: 0;
margin: auto;
position: absolute;
right: 0;
top: 0;
z-index: 2;
}
/*================================================
Tiles
================================================*/
.tile {
background: rgba(0, 0, 0, 0.15);
position: absolute;
-webkit-transition-property: background,
box-shadow,
opacity,
-webkit-transform;
transition-property: background,
box-shadow,
opacity,
-webkit-transform;
transition-property: background,
box-shadow,
opacity,
transform
;
transition-property:
background,
box-shadow,
opacity,
transform,
-webkit-transform;
-webkit-transform: translateZ(0);
transform: translateZ(0);
-webkit-transition-duration: 3000ms;
transition-duration: 3000ms;
}
.tile:before {
bottom: 0;
content: '';
height: 0;
left: 0;
margin: auto;
opacity: 0;
position: absolute;
right: 0;
top: 0;
width: 0;
-webkit-transition: opacity 300ms;
transition: opacity 300ms;
}
.tile.path:before {
opacity: 1;
}
.tile.up:before {
border-bottom: 4px inset rgba(255, 255, 255, 0.15);
border-left: 4px solid transparent;
border-right: 4px solid transparent;
}
.tile.down:before {
border-top: 4px inset rgba(255, 255, 255, 0.15);
border-left: 4px solid transparent;
border-right: 4px solid transparent;
}
.tile.left:before {
border-right: 4px inset rgba(255, 255, 255, 0.15);
border-top: 4px solid transparent;
border-bottom: 4px solid transparent;
}
.tile.right:before {
border-left: 4px inset rgba(255, 255, 255, 0.15);
border-top: 4px solid transparent;
border-bottom: 4px solid transparent;
}
@media (max-width: 900px), (max-height: 900px) {
.tile.up:before,
.tile.down:before,
.tile.left:before,
.tile.right:before {
border-width: 3px;
}
}
@media (max-width: 500px), (max-height: 500px) {
.tile.up:before,
.tile.down:before,
.tile.left:before,
.tile.right:before {
border-width: 2px;
}
}
.tile.pressed {
background: rgba(0, 0, 0, 0.3);
box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.6);
-webkit-transition-duration: 0ms;
transition-duration: 0ms;
}
</style>
</head>
<body>
<div class="score">0</div>
<div class="stage"></div>
<script>
/*================================================
Polyfill
================================================*/
(function(){
'use strict';
/*================================================
Request Animation Frame
================================================*/
var lastTime = 0;
var vendors = [ 'webkit', 'moz' ];
for( var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x ) {
window.requestAnimationFrame = window[ vendors[ x ] + 'RequestAnimationFrame' ];
window.cancelAnimationFrame = window[ vendors[ x ] + 'CancelAnimationFrame' ] || window[ vendors[ x ] + 'CancelRequestAnimationFrame' ];
}
if( !window.requestAnimationFrame ) {
window.requestAnimationFrame = function( callback, element ) {
var currTime = new Date().getTime();
var timeToCall = Math.max( 0, 16 - ( currTime - lastTime ) );
var id = window.setTimeout(
function() {
callback( currTime + timeToCall );
}, timeToCall );
lastTime = currTime + timeToCall;
return id;
}
}
if( !window.cancelAnimationFrame ) {
window.cancelAnimationFrame = function( id ) {
clearTimeout( id );
}
}
})();
/*================================================
DOM Manipulation
================================================*/
(function(){
'use strict';
function hasClass( elem, className ) {
return new RegExp( ' ' + className + ' ' ).test( ' ' + elem.className + ' ' );
};
function addClass( elem, className ) {
if( !hasClass(elem, className ) ) {
elem.className += ' ' + className;
}
};
function removeClass( elem, className ) {
var newClass = ' ' + elem.className.replace( /[\t\r\n]/g, ' ' ) + ' ';
if( hasClass( elem, className ) ) {
while( newClass.indexOf(' ' + className + ' ' ) >= 0 ) {
newClass = newClass.replace( ' ' + className + ' ', ' ' );
}
elem.className = newClass.replace( /^\s+|\s+$/g, '' );
}
};
function toggleClass( elem, className ) {
var newClass = ' ' + elem.className.replace( /[\t\r\n]/g, ' ' ) + ' ';
if( hasClass(elem, className ) ) {
while( newClass.indexOf( ' ' + className + ' ' ) >= 0 ) {
newClass = newClass.replace( ' ' + className + ' ' , ' ' );
}
elem.className = newClass.replace( /^\s+|\s+$/g, '' );
} else {
elem.className += ' ' + className;
}
};
})();
/*================================================
Core
================================================*/
g = {
};
(function(){
'use strict';
/*================================================
Math
================================================*/
g.m = Math;
g.mathProps = 'E LN10 LN2 LOG2E LOG10E PI SQRT1_2 SQRT2 abs acos asin atan ceil cos exp floor log round sin sqrt tan atan2 pow max min'.split( ' ' );
for ( var i = 0; i < g.mathProps.length; i++ ) {
g[ g.mathProps[ i ] ] = g.m[ g.mathProps[ i ] ];
}
g.m.TWO_PI = g.m.PI * 2;
/*================================================
Miscellaneous
================================================*/
g.isset = function( prop ) {
return typeof prop != 'undefined';
};
g.log = function() {
if( g.isset( g.config ) && g.config.debug && window.console ){
console.log( Array.prototype.slice.call( arguments ) );
}
};
})();
/*================================================
Group
================================================*/
(function(){
'use strict';
g.Group = function() {
this.collection = [];
this.length = 0;
};
g.Group.prototype.add = function( item ) {
this.collection.push( item );
this.length++;
};
g.Group.prototype.remove = function( index ) {
if( index < this.length ) {
this.collection.splice( index, 1 );
this.length--;
}
};
g.Group.prototype.empty = function() {
this.collection.length = 0;
this.length = 0;
};
g.Group.prototype.each = function( action, asc ) {
var asc = asc || 0,
i;
if( asc ) {
for( i = 0; i < this.length; i++ ) {
this.collection[ i ][ action ]( i );
}
} else {
i = this.length;
while( i-- ) {
this.collection[ i ][ action ]( i );
}
}
};
})();
/*================================================
Utilities
================================================*/
(function(){
'use strict';
g.util = {
};
/*================================================
Random
================================================*/
g.util.rand = function( min, max ) {
return g.m.random() * ( max - min ) + min;
};
g.util.randInt = function( min, max ) {
return g.m.floor( g.m.random() * ( max - min + 1) ) + min;
};
}());
/*================================================
State
================================================*/
(function(){
'use strict';
g.states = {
};
g.addState = function( state ) {
g.states[ state.name ] = state;
};
g.setState = function( name ) {
if( g.state ) {
g.states[ g.state ].exit();
}
g.state = name;
g.states[ g.state ].init();
};
g.currentState = function() {
return g.states[ g.state ];
};
}());
/*================================================
Time
================================================*/
(function(){
'use strict';
g.Time = function() {
this.reset();
}
g.Time.prototype.reset = function() {
this.now = Date.now();
this.last = Date.now();
this.delta = 60;
this.ndelta = 1;
this.elapsed = 0;
this.nelapsed = 0;
this.tick = 0;
};
g.Time.prototype.update = function() {
this.now = Date.now();
this.delta = this.now - this.last;
this.ndelta = Math.min( Math.max( this.delta / ( 1000 / 60 ), 0.0001 ), 10 );
this.elapsed += this.delta;
this.nelapsed += this.ndelta;
this.last = this.now;
this.tick++;
};
})();
/*================================================
Grid Entity
================================================*/
(function(){
'use strict';
g.Grid = function( cols, rows ) {
this.cols = cols;
this.rows = rows;
this.tiles = [];
for( var x = 0; x < cols; x++ ) {
this.tiles[ x ] = [];
for( var y = 0; y < rows; y++ ) {
this.tiles[ x ].push( 'empty' );
}
}
};
g.Grid.prototype.get = function( x, y ) {
return this.tiles[ x ][ y ];
};
g.Grid.prototype.set = function( x, y, val ) {
this.tiles[ x ][ y ] = val;
};
})();
/*================================================
Board Tile Entity
================================================*/
(function(){
'use strict';
g.BoardTile = function( opt ) {
this.parentState = opt.parentState;
this.parentGroup = opt.parentGroup;
this.col = opt.col;
this.row = opt.row;
this.x = opt.x;
this.y = opt.y;
this.z = 0;
this.w = opt.w;
this.h = opt.h;
this.elem = document.createElement( 'div' );
this.elem.style.position = 'absolute';
this.elem.className = 'tile';
this.parentState.stageElem.appendChild( this.elem );
this.classes = {
pressed: 0,
path: 0,
up: 0,
down: 0,
left: 0,
right: 0
}
this.updateDimensions();
};
g.BoardTile.prototype.update = function() {
for( var k in this.classes ) {
if( this.classes[ k ] ) {
this.classes[ k ]--;
}
}
if( this.parentState.food.tile.col == this.col || this.parentState.food.tile.row == this.row ) {
this.classes.path = 1;
if( this.col < this.parentState.food.tile.col ) {
this.classes.right = 1;
} else {
this.classes.right = 0;
}
if( this.col > this.parentState.food.tile.col ) {
this.classes.left = 1;
} else {
this.classes.left = 0;
}
if( this.row > this.parentState.food.tile.row ) {
this.classes.up = 1;
} else {
this.classes.up = 0;
}
if( this.row < this.parentState.food.tile.row ) {
this.classes.down = 1;
} else {
this.classes.down = 0;
}
} else {
this.classes.path = 0;
}
if( this.parentState.food.eaten ) {
this.classes.path = 0;
}
};
g.BoardTile.prototype.updateDimensions = function() {
this.x = this.col * this.parentState.tileWidth;
this.y = this.row * this.parentState.tileHeight;
this.w = this.parentState.tileWidth - this.parentState.spacing;
this.h = this.parentState.tileHeight - this.parentState.spacing;
this.elem.style.left = this.x + 'px';
this.elem.style.top = this.y + 'px';
this.elem.style.width = this.w + 'px';
this.elem.style.height = this.h + 'px';
};
g.BoardTile.prototype.render = function() {
var classString = '';
for( var k in this.classes ) {
if( this.classes[ k ] ) {
classString += k + ' ';
}
}
this.elem.className = 'tile ' + classString;
};
})();
/*================================================
Snake Tile Entity
================================================*/
(function(){
'use strict';
g.SnakeTile = function( opt ) {
this.parentState = opt.parentState;
this.parentGroup = opt.parentGroup;
this.col = opt.col;
this.row = opt.row;
this.x = opt.x;
this.y = opt.y;
this.w = opt.w;
this.h = opt.h;
this.color = null;
this.scale = 1;
this.rotation = 0;
this.blur = 0;
this.alpha = 1;
this.borderRadius = 0;
this.borderRadiusAmount = 0;
this.elem = document.createElement( 'div' );
this.elem.style.position = 'absolute';
this.parentState.stageElem.appendChild( this.elem );
};
g.SnakeTile.prototype.update = function( i ) {
this.x = this.col * this.parentState.tileWidth;
this.y = this.row * this.parentState.tileHeight;
if( i == 0 ) {
this.color = '#fff';
this.blur = this.parentState.dimAvg * 0.03 + Math.sin( this.parentState.time.elapsed / 200 ) * this.parentState.dimAvg * 0.015;
if( this.parentState.snake.dir == 'n' ) {
this.borderRadius = this.borderRadiusAmount + '% ' + this.borderRadiusAmount + '% 0 0';
} else if( this.parentState.snake.dir == 's' ) {
this.borderRadius = '0 0 ' + this.borderRadiusAmount + '% ' + this.borderRadiusAmount + '%';
} else if( this.parentState.snake.dir == 'e' ) {
this.borderRadius = '0 ' + this.borderRadiusAmount + '% ' + this.borderRadiusAmount + '% 0';
} else if( this.parentState.snake.dir == 'w' ) {
this.borderRadius = this.borderRadiusAmount + '% 0 0 ' + this.borderRadiusAmount + '%';
}
} else {
this.color = '#fff';
this.blur = 0;
this.borderRadius = '0';
}
this.alpha = 1 - ( i / this.parentState.snake.tiles.length ) * 0.6;
this.rotation = ( this.parentState.snake.justAteTick / this.parentState.snake.justAteTickMax ) * 90;
this.scale = 1 + ( this.parentState.snake.justAteTick / this.parentState.snake.justAteTickMax ) * 1;
};
g.SnakeTile.prototype.updateDimensions = function() {
this.w = this.parentState.tileWidth - this.parentState.spacing;
this.h = this.parentState.tileHeight - this.parentState.spacing;
};
g.SnakeTile.prototype.render = function( i ) {
this.elem.style.left = this.x + 'px';
this.elem.style.top = this.y + 'px';
this.elem.style.width = this.w + 'px';
this.elem.style.height = this.h + 'px';
this.elem.style.backgroundColor = 'rgba(255, 255, 255, ' + this.alpha + ')';
this.elem.style.boxShadow = '0 0 ' + this.blur + 'px #fff';
this.elem.style.borderRadius = this.borderRadius;
};
})();
/*================================================
Food Tile Entity
================================================*/
(function(){
'use strict';
g.FoodTile = function( opt ) {
this.parentState = opt.parentState;
this.parentGroup = opt.parentGroup;
this.col = opt.col;
this.row = opt.row;
this.x = opt.x;
this.y = opt.y;
this.w = opt.w;
this.h = opt.h;
this.blur = 0;
this.scale = 1;
this.hue = 100;
this.opacity = 0;
this.elem = document.createElement( 'div' );
this.elem.style.position = 'absolute';
this.parentState.stageElem.appendChild( this.elem );
};
g.FoodTile.prototype.update = function() {
this.x = this.col * this.parentState.tileWidth;
this.y = this.row * this.parentState.tileHeight;
this.blur = this.parentState.dimAvg * 0.03 + Math.sin( this.parentState.time.elapsed / 200 ) * this.parentState.dimAvg * 0.015;
this.scale = 0.8 + Math.sin( this.parentState.time.elapsed / 200 ) * 0.2;
if( this.parentState.food.birthTick || this.parentState.food.deathTick ) {
if( this.parentState.food.birthTick ) {
this.opacity = 1 - ( this.parentState.food.birthTick / 1 ) * 1;
} else {
this.opacity = ( this.parentState.food.deathTick / 1 ) * 1;
}
} else {
this.opacity = 1;
}
};
g.FoodTile.prototype.updateDimensions = function() {
this.w = this.parentState.tileWidth - this.parentState.spacing;
this.h = this.parentState.tileHeight - this.parentState.spacing;
};
g.FoodTile.prototype.render = function() {
this.elem.style.left = this.x + 'px';
this.elem.style.top = this.y + 'px';
this.elem.style.width = this.w + 'px';
this.elem.style.height = this.h + 'px';
this.elem.style[ 'transform' ] = 'translateZ(0) scale(' + this.scale + ')';
this.elem.style.backgroundColor = 'hsla(' + this.hue + ', 100%, 60%, 1)';
this.elem.style.boxShadow = '0 0 ' + this.blur + 'px hsla(' + this.hue + ', 100%, 60%, 1)';
this.elem.style.opacity = this.opacity;
};
})();
/*================================================
Snake Entity
================================================*/
(function(){
'use strict';
g.Snake = function( opt ) {
this.parentState = opt.parentState;
this.dir = 'e',
this.currDir = this.dir;
this.tiles = [];
for( var i = 0; i < 5; i++ ) {
this.tiles.push( new g.SnakeTile({
parentState: this.parentState,
parentGroup: this.tiles,
col: 8 - i,
row: 3,
x: ( 8 - i ) * opt.parentState.tileWidth,
y: 3 * opt.parentState.tileHeight,
w: opt.parentState.tileWidth - opt.parentState.spacing,
h: opt.parentState.tileHeight - opt.parentState.spacing
}));
}
this.last = 0;
this.updateTick = 10;
this.updateTickMax = this.updateTick;
this.updateTickLimit = 3;
this.updateTickChange = 0.2;
this.deathFlag = 0;
this.justAteTick = 0;
this.justAteTickMax = 1;
this.justAteTickChange = 0.05;
// sync data grid of the play state
var i = this.tiles.length;
while( i-- ) {
this.parentState.grid.set( this.tiles[ i ].col, this.tiles[ i ].row, 'snake' );
}
};
g.Snake.prototype.updateDimensions = function() {
var i = this.tiles.length;
while( i-- ) {
this.tiles[ i ].updateDimensions();
}
};
g.Snake.prototype.update = function() {
if( this.parentState.keys.up ) {
if( this.dir != 's' && this.dir != 'n' && this.currDir != 's' && this.currDir != 'n' ) {
this.dir = 'n';
}
} else if( this.parentState.keys.down) {
if( this.dir != 'n' && this.dir != 's' && this.currDir != 'n' && this.currDir != 's' ) {
this.dir = 's';
}
} else if( this.parentState.keys.right ) {
if( this.dir != 'w' && this.dir != 'e' && this.currDir != 'w' && this.currDir != 'e' ) {
this.dir = 'e';
}
} else if( this.parentState.keys.left ) {
if( this.dir != 'e' && this.dir != 'w' && this.currDir != 'e' && this.currDir != 'w' ) {
this.dir = 'w';
}
}
this.parentState.keys.up = 0;
this.parentState.keys.down = 0;
this.parentState.keys.right = 0;
this.parentState.keys.left = 0;
this.updateTick += this.parentState.time.ndelta;
if( this.updateTick >= this.updateTickMax ) {
// reset the update timer to 0, or whatever leftover there is
this.updateTick = ( this.updateTick - this.updateTickMax );
// rotate snake block array
this.tiles.unshift( new g.SnakeTile({
parentState: this.parentState,
parentGroup: this.tiles,
col: this.tiles[ 0 ].col,
row: this.tiles[ 0 ].row,
x: this.tiles[ 0 ].col * this.parentState.tileWidth,
y: this.tiles[ 0 ].row * this.parentState.tileHeight,
w: this.parentState.tileWidth - this.parentState.spacing,
h: this.parentState.tileHeight - this.parentState.spacing
}));
this.last = this.tiles.pop();
this.parentState.stageElem.removeChild( this.last.elem );
this.parentState.boardTiles.collection[ this.last.col + ( this.last.row * this.parentState.cols ) ].classes.pressed = 2;
// sync data grid of the play state
var i = this.tiles.length;
while( i-- ) {
this.parentState.grid.set( this.tiles[ i ].col, this.tiles[ i ].row, 'snake' );
}
this.parentState.grid.set( this.last.col, this.last.row, 'empty' );
// move the snake's head
if ( this.dir == 'n' ) {
this.currDir = 'n';
this.tiles[ 0 ].row -= 1;
} else if( this.dir == 's' ) {
this.currDir = 's';
this.tiles[ 0 ].row += 1;
} else if( this.dir == 'w' ) {
this.currDir = 'w';
this.tiles[ 0 ].col -= 1;
} else if( this.dir == 'e' ) {
this.currDir = 'e';
this.tiles[ 0 ].col += 1;
}
// wrap walls
this.wallFlag = false;
if( this.tiles[ 0 ].col >= this.parentState.cols ) {
this.tiles[ 0 ].col = 0;
this.wallFlag = true;
}
if( this.tiles[ 0 ].col < 0 ) {
this.tiles[ 0 ].col = this.parentState.cols - 1;
this.wallFlag = true;
}
if( this.tiles[ 0 ].row >= this.parentState.rows ) {
this.tiles[ 0 ].row = 0;
this.wallFlag = true;
}
if( this.tiles[ 0 ].row < 0 ) {
this.tiles[ 0 ].row = this.parentState.rows - 1;
this.wallFlag = true;
}
// check death by eating self
if( this.parentState.grid.get( this.tiles[ 0 ].col, this.tiles[ 0 ].row ) == 'snake' ) {
this.deathFlag = 1;
clearTimeout( this.foodCreateTimeout );
}
// check eating of food
if( this.parentState.grid.get( this.tiles[ 0 ].col, this.tiles[ 0 ].row ) == 'food' ) {
this.tiles.push( new g.SnakeTile({
parentState: this.parentState,
parentGroup: this.tiles,
col: this.last.col,
row: this.last.row,
x: this.last.col * this.parentState.tileWidth,
y: this.last.row * this.parentState.tileHeight,
w: this.parentState.tileWidth - this.parentState.spacing,
h: this.parentState.tileHeight - this.parentState.spacing
}));
if( this.updateTickMax - this.updateTickChange > this.updateTickLimit ) {
this.updateTickMax -= this.updateTickChange;
}
this.parentState.score++;
this.parentState.scoreElem.innerHTML = this.parentState.score;
this.justAteTick = this.justAteTickMax;
this.parentState.food.eaten = 1;
this.parentState.stageElem.removeChild( this.parentState.food.tile.elem );
var _this = this;
this.foodCreateTimeout = setTimeout( function() {
_this.parentState.food = new g.Food({
parentState: _this.parentState
});
}, 300);
}
// check death by eating self
if( this.deathFlag ) {
g.setState( 'play' );
}
}
// update individual snake tiles
var i = this.tiles.length;
while( i-- ) {
this.tiles[ i ].update( i );
}
if( this.justAteTick > 0 ) {
this.justAteTick -= this.justAteTickChange;
} else if( this.justAteTick < 0 ) {
this.justAteTick = 0;
}
};
g.Snake.prototype.render = function() {
// render individual snake tiles
var i = this.tiles.length;
while( i-- ) {
this.tiles[ i ].render( i );
}
};
})();
/*================================================
Food Entity
================================================*/
(function(){
'use strict';
g.Food = function( opt ) {
this.parentState = opt.parentState;
this.tile = new g.FoodTile({
parentState: this.parentState,
col: 0,
row: 0,
x: 0,
y: 0,
w: opt.parentState.tileWidth - opt.parentState.spacing,
h: opt.parentState.tileHeight - opt.parentState.spacing
});
this.reset();
this.eaten = 0;
this.birthTick = 1;
this.deathTick = 0;
this.birthTickChange = 0.025;
this.deathTickChange = 0.05;
};
g.Food.prototype.reset = function() {
var empty = [];
for( var x = 0; x < this.parentState.cols; x++) {
for( var y = 0; y < this.parentState.rows; y++) {
var tile = this.parentState.grid.get( x, y );
if( tile == 'empty' ) {
empty.push( {
x: x, y: y } );
}
}
}
var newTile = empty[ g.util.randInt( 0, empty.length - 1 ) ];
this.tile.col = newTile.x;
this.tile.row = newTile.y;
};
g.Food.prototype.updateDimensions = function() {
this.tile.updateDimensions();
};
g.Food.prototype.update = function() {
// update food tile
this.tile.update();
if( this.birthTick > 0 ) {
this.birthTick -= this.birthTickChange;
} else if( this.birthTick < 0 ) {
this.birthTick = 0;
}
// sync data grid of the play state
this.parentState.grid.set( this.tile.col, this.tile.row, 'food' );
};
g.Food.prototype.render = function() {
this.tile.render();
};
})();
/*================================================
Play State
================================================*/
(function(){
'use strict';
function StatePlay() {
this.name = 'play';
}
StatePlay.prototype.init = function() {
this.scoreElem = document.querySelector( '.score' );
this.stageElem = document.querySelector( '.stage' );
this.dimLong = 28;
this.dimShort = 16;
this.padding = 0.25;
this.boardTiles = new g.Group();
this.keys = {
};
this.foodCreateTimeout = null;
this.score = 0;
this.scoreElem.innerHTML = this.score;
this.time = new g.Time();
this.getDimensions();
if( this.winWidth < this.winHeight ) {
this.rows = this.dimLong;
this.cols = this.dimShort;
} else {
this.rows = this.dimShort;
this.cols = this.dimLong;
}
this.spacing = 1;
this.grid = new g.Grid( this.cols, this.rows );
this.resize();
this.createBoardTiles();
this.bindEvents();
this.snake = new g.Snake({
parentState: this
});
this.food = new g.Food({
parentState: this
});
};
StatePlay.prototype.getDimensions = function() {
this.winWidth = window.innerWidth;
this.winHeight = window.innerHeight;
this.activeWidth = this.winWidth - ( this.winWidth * this.padding );
this.activeHeight = this.winHeight - ( this.winHeight * this.padding );
};
StatePlay.prototype.resize = function() {
var _this = g.currentState();
_this.getDimensions();
_this.stageRatio = _this.rows / _this.cols;
if( _this.activeWidth > _this.activeHeight / _this.stageRatio ) {
_this.stageHeight = _this.activeHeight;
_this.stageElem.style.height = _this.stageHeight + 'px';
_this.stageWidth = Math.floor( _this.stageHeight /_this.stageRatio );
_this.stageElem.style.width = _this.stageWidth + 'px';
} else {
_this.stageWidth = _this.activeWidth;
_this.stageElem.style.width = _this.stageWidth + 'px';
_this.stageHeight = Math.floor( _this.stageWidth * _this.stageRatio );
_this.stageElem.style.height = _this.stageHeight + 'px';
}
_this.tileWidth = ~~( _this.stageWidth / _this.cols );
_this.tileHeight = ~~( _this.stageHeight / _this.rows );
_this.dimAvg = ( _this.activeWidth + _this.activeHeight ) / 2;
_this.spacing = Math.max( 1, ~~( _this.dimAvg * 0.0025 ) );
_this.stageElem.style.marginTop = ( -_this.stageElem.offsetHeight / 2 ) + _this.headerHeight / 2 + 'px';
_this.boardTiles.each( 'updateDimensions' );
_this.snake !== undefined && _this.snake.updateDimensions();
_this.food !== undefined && _this.food.updateDimensions();
};
StatePlay.prototype.createBoardTiles = function() {
for( var y = 0; y < this.rows; y++ ) {
for( var x = 0; x < this.cols; x++ ) {
this.boardTiles.add( new g.BoardTile({
parentState: this,
parentGroup: this.boardTiles,
col: x,
row: y,
x: x * this.tileWidth,
y: y * this.tileHeight,
w: this.tileWidth - this.spacing,
h: this.tileHeight - this.spacing
}));
}
}
};
StatePlay.prototype.upOn = function() {
g.currentState().keys.up = 1; }
StatePlay.prototype.downOn = function() {
g.currentState().keys.down = 1; }
StatePlay.prototype.rightOn = function() {
g.currentState().keys.right = 1; }
StatePlay.prototype.leftOn = function() {
g.currentState().keys.left = 1; }
StatePlay.prototype.upOff = function() {
g.currentState().keys.up = 0; }
StatePlay.prototype.downOff = function() {
g.currentState().keys.down = 0; }
StatePlay.prototype.rightOff = function() {
g.currentState().keys.right = 0; }
StatePlay.prototype.leftOff = function() {
g.currentState().keys.left = 0; }
StatePlay.prototype.keydown = function( e ) {
e.preventDefault();
var e = ( e.keyCode ? e.keyCode : e.which ),
_this = g.currentState();
if( e === 38 || e === 87 ) {
_this.upOn(); }
if( e === 39 || e === 68 ) {
_this.rightOn(); }
if( e === 40 || e === 83 ) {
_this.downOn(); }
if( e === 37 || e === 65 ) {
_this.leftOn(); }
};
StatePlay.prototype.bindEvents = function() {
var _this = g.currentState();
window.addEventListener( 'keydown', _this.keydown, false );
window.addEventListener( 'resize', _this.resize, false );
};
StatePlay.prototype.step = function() {
this.boardTiles.each( 'update' );
this.boardTiles.each( 'render' );
this.snake.update();
this.snake.render();
this.food.update();
this.food.render();
this.time.update();
};
StatePlay.prototype.exit = function() {
window.removeEventListener( 'keydown', this.keydown, false );
window.removeEventListener( 'resize', this.resize, false );
this.stageElem.innerHTML = '';
this.grid.tiles = null;
this.time = null;
};
g.addState( new StatePlay() );
})();
/*================================================
Game
================================================*/
(function(){
'use strict';
g.config = {
title: 'Snakely',
debug: window.location.hash == '#debug' ? 1 : 0,
state: 'play'
};
g.setState( g.config.state );
g.time = new g.Time();
g.step = function() {
requestAnimationFrame( g.step );
g.states[ g.state ].step();
g.time.update();
};
window.addEventListener( 'load', g.step, false );
})();</script>
</body>
</html>```
来源：oschina
链接：https://my.oschina.net/u/4412486/blog/4697216