forked from CodeExplainedRepo/Snake-JavaScript
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathsnake.js
More file actions
170 lines (115 loc) · 3.26 KB
/
snake.js
File metadata and controls
170 lines (115 loc) · 3.26 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
Create by Learn Web Developement
Youtube channel : https://www.youtube.com/channel/UC8n8ftV94ZU_DJLOLtrpORA
*/
const cvs = document.getElementById("snake");
const ctx = cvs.getContext("2d");
// create the unit
const box = 32;
// load images
const ground = new Image();
ground.src = "img/ground.png";
const foodImg = new Image();
foodImg.src = "img/food.png";
// load audio files
let dead = new Audio();
let eat = new Audio();
let up = new Audio();
let right = new Audio();
let left = new Audio();
let down = new Audio();
dead.src = "audio/dead.mp3";
eat.src = "audio/eat.mp3";
up.src = "audio/up.mp3";
right.src = "audio/right.mp3";
left.src = "audio/left.mp3";
down.src = "audio/down.mp3";
// create the snake
let snake = [];
snake[0] = {
x : 9 * box,
y : 10 * box
};
// create the food
let food = {
x : Math.floor(Math.random()*17+1) * box,
y : Math.floor(Math.random()*15+3) * box
}
// create the score var
let score = 0;
//control the snake
let d;
document.addEventListener("keydown",direction);
function direction(event){
let key = event.keyCode;
if( key == 37 && d != "RIGHT"){
left.play();
d = "LEFT";
}else if(key == 38 && d != "DOWN"){
d = "UP";
up.play();
}else if(key == 39 && d != "LEFT"){
d = "RIGHT";
right.play();
}else if(key == 40 && d != "UP"){
d = "DOWN";
down.play();
}
}
// cheack collision function
function collision(head,array){
for(let i = 0; i < array.length; i++){
if(head.x == array[i].x && head.y == array[i].y){
return true;
}
}
return false;
}
// draw everything to the canvas
function draw(){
ctx.drawImage(ground,0,0);
for( let i = 0; i < snake.length ; i++){
ctx.fillStyle = ( i == 0 )? "green" : "white";
ctx.fillRect(snake[i].x,snake[i].y,box,box);
ctx.strokeStyle = "red";
ctx.strokeRect(snake[i].x,snake[i].y,box,box);
}
ctx.drawImage(foodImg, food.x, food.y);
// old head position
let snakeX = snake[0].x;
let snakeY = snake[0].y;
// which direction
if( d == "LEFT") snakeX -= box;
if( d == "UP") snakeY -= box;
if( d == "RIGHT") snakeX += box;
if( d == "DOWN") snakeY += box;
// if the snake eats the food
if(snakeX == food.x && snakeY == food.y){
score++;
eat.play();
food = {
x : Math.floor(Math.random()*17+1) * box,
y : Math.floor(Math.random()*15+3) * box
}
// we don't remove the tail
}else{
// remove the tail
snake.pop();
}
// add new Head
let newHead = {
x : snakeX,
y : snakeY
}
// game over
if(snakeX < box || snakeX > 17 * box || snakeY < 3*box || snakeY > 17*box || collision(newHead,snake)){
clearInterval(game);
dead.play();
}
snake.unshift(newHead);
ctx.fillStyle = "white";
ctx.font = "45px Changa one";
ctx.fillText(score,2*box,1.6*box);
}
// call draw function every 100 ms
let game = setInterval(draw,100);