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JS writing snake (Object oriented idea)

Source: Internet
Author: User
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: (Sorry, due to my limited ability, can only temporarily put static diagram.) Later, the dynamic diagram will be updated up)

<! DOCTYPE html>
    <meta charset= "UTF-8" >
    <title></title>
    <style>
        #map {
            width:500px;
            height:500px;
            position:relative;
            Background: #ccc;
        }
    </style>
<body>
<div id= "Map" ></div>
<script src= "Food.js" ></script>
<script src= "Snake.js" ></script>
<script src= "Game.js" ></script>
<script>
    var map = document.getElementById ("map");
    var game = new Game (map);
    Game.init ();
</script>
</body>

Food.js content:
(function () {
function food (width,height,top,left,background) {
This.width = Width | | 20;
This.height = Height | | 20;
This.top = Top | | 0;
This.left = left | | 0;
This.background = Background | | "Green";
}
var newfood = null;
Food.prototype.init = function (map) {
Removefood (map);
Newfood = document.createelement ("div");
NewFood.style.width = this.width + "px";
NewFood.style.height = this.height + "px";
NewFood.style.background = This.background;
This.top = parseint (Math.random () * (map.offsetheight-this.height)/this.height) *this.height;
This.left = parseint (Math.random () * (map.offsetwidth-this.width)/this.width) *this.width;
NewFood.style.top = this.top + "px";
NewFood.style.left = this.left + "px";
NewFood.style.position = "absolute";
Map.appendchild (Newfood);
}
function Removefood (map) {
if (Newfood) {
Map.removechild (Newfood);
}
}
Window. food = food;
})();

Snake.js content:
(function () {
function Snake (width,height,direction) {
This.width = Width | | 20;
This.height = Height | | 20;
this.direction = Direction | | "Right";
This.body = [
{top:1,left:3,color: "Red"},
{top:1,left:2,color: "Gold"},
{top:1,left:1,color: "Gold"}
]
}
var newsnake = [];
Snake.prototype.init = function (map) {
Removesnake (map);
for (var i = 0; i < this.body.length; i++) {
var snake = document.createelement ("div");
Snake.style.width =this.width+ "px";
snake.style.height= this.height + "px";
Snake.style.background = this.direction;
Snake.style.position = "absolute";
Snake.style.top = this.body[i].top*this.height + "px";
Snake.style.left = this.body[i].left*this.width+ "px";
Snake.style.background = This.body[i].color;
Map.appendchild (snake);
Newsnake.push (snake);
}
}
Snake.prototype.move = function (Map,food) {
Move the process, delete the original, create a new, middle plus position move
Removesnake (map);
for (Var j=this.body.length-1;j>=1;j--) {
This.body[j].left = This.body[j-1].left;
This.body[j].top = This.body[j-1].top;
}
Switch (this.direction) {
Case ' right ':
This.body[0].left +=1;
Break
Case ' left ':
This.body[0].left-=1;
Break
Case "Top":
This.body[0].top-=1;
Break
Case "Bottom":
This.body[0].top +=1;
}
During the move, if the head of the snake is in the same position as the food, 1, create a new food 2, the snake body added part
var last = this.body[this.body.length-1];
var x = this.body[0].left*food.width;
var y = this.body[0].top * food.height;
if (x = = Food.left && y = = food.top) {
Food.init (map);
var NEWBO = {
Top:last.top,
Left:last.left,
Color: "Gold"
}
This.body.push (NEWBO);
}
This.init (map);
}
function Removesnake (map) {
for (Var i=0;i<newsnake.length;) {
Map.removechild (Newsnake[i]);
Newsnake.shift ();
}
}
Window. Snake = Snake;
})();

Game.js content:
(function () {
function Game (map) {
var food = new food ();
This.food = food;
var snake = new Snake ();
This.snake = snake;
This.map = map;
}
game.prototype.init= function () {
This.snake.init (THIS.MAP);
This.food.init (THIS.MAP);
Snakemove (This.map,this.food,this.snake);
Changedire (This.snake);
}
function Snakemove (map,food,snake) {
Set timer, snake move
Timer = setinterval (function () {
Snake.move (Map,food);
Determine if the position of the snake head is out of range
var x = map.offsetwidth/parseint (food.width)-1;
var y = map.offsetheight/parseint (food.height)-1;
if (snake.body[0].left<0 | | snake.body[0].left>x) {
Clearinterval (timer);
Alert ("Game over");
}
if (snake.body[0].top<0 | | snake.body[0].top>y) {
Clearinterval (timer);
Alert ("Game over");
}

},200);

}
Change direction based on input value
function Changedire (snake) {
Document.onkeydown = function (event) {
Event = Event | | window.event;
var num = Event.keycode;
Switch (num) {
Case 37:snake.direction = "left";
Case 38:snake.direction = "top";
Case 39:snake.direction = "right";
Case 40:snake.direction = "bottom";
}
}
}

Window. Game = game;
})();

JS writing snake (Object oriented idea)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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