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snake.html
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snake.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Gamedev Canvas Workshop</title>
<style>
* { padding: 0; margin: 0; }
canvas { background: #eee; display: block; margin: 0 auto; }
</style>
</head>
<body>
<canvas id="myCanvas" width="500" height="350"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var speed = 10;
var snakes = [];
var snakeLength = 10;
gameSpeed = 10;
var food = {
x : rnd(10, canvas.width),
y : rnd(10, canvas.height),
width : 10,
height : 10
}
var dir = 'left';
document.onkeydown = function(e){
if(!e){
e = window.e;
}
var code = e.keyCode;
if(e.charCode && codee ==0){
code = e.charCode;
}
switch (code) {
case 37://left
if(dir != 'right')
dir = 'left';
break;
case 38:
if(dir != 'down')
dir = 'up';
break;
case 39:
if(dir != 'left')
dir = 'right';
break;
case 40:
if(dir != 'up')
dir = 'down';
break;
}
}
function initSnake(x,y){
if(!x) x = 230;
if(!y) y = 150;
for (var i = 0; i < snakeLength; i++) {
snakes.push({
x : x - (speed *i),
y : y,
dir : 'right',
width : 10,
height : 10,
color : 'blue'
});
}
}
initSnake();
var head = [];
var poses = [];
speed = 10;
dir = 'right';
function makeSnake() {
head = snakes[0];
head.dir = dir;
for (let [i, snake] of snakes.reverse().entries()) {
var snakePrev = snakes[i + 1] || snakes[snakes.length - 1];
if(snake.dir == 'right'){
snake.x += speed;
}
if(snake.dir == 'down'){
snake.y += speed;
}
if(snake.dir == 'left'){
snake.x -= speed;
}
if(snake.dir == 'up'){
snake.y -= speed;
}
if(snake.x > canvas.width){
snake.x = 0;
}
if(snake.x < 0){
snake.x = canvas.width;
}
if(snake.y > canvas.height){
snake.y = 0;
}
if(snake.y < 0 ){
snake.y = canvas.height;
}
snake.dir = snakePrev.dir;
context.beginPath();
// context.arc(snake.x, snake.y,5 ,0,Math.PI * 2 );
context.rect(snake.x , snake.y , snake.width , snake.height);
context.fillStyle = snake.color;
context.fill();
context.closePath();
if(snake != head && isCollide(snake, snakes[snakes.length - 1])){
alert("you fucked!!!");
gameSpeed = -1;
}
if(isCollide(head,food)){
food.x = rnd(10, canvas.width - 10);
food.y = rnd(10, canvas.height - 10);
gameSpeed -= 1 ;
if(gameSpeed == 0){
gameSpeed = 1;
}
snakes.push({
x : snake.x,//- (11 *i),
y : snake.y,
dir : snake.dir,
width : speed,
height : speed,
color : "blue"
});
}
}
snakes.reverse();
}
function isCollide(a,b) {
return (
(b.x == a.x) &&
(b.y == a.y)
);
}
function rnd(min, max) {
var r = Math.round(Math.random() * (max - min) + min);
return (r - r % speed);
}
function makeFood() {
context.beginPath();
context.rect(food.x,food.y,food.width,food.height);
context.fillStyle = "green";
context.fill();
context.closePath();
}
var frame = 0;
(function loop(){
requestAnimationFrame(function () {
if(frame % gameSpeed == 0 ){
context.clearRect(0 , 0, canvas.width, canvas.height);
head = snakes[0];
makeSnake();
makeFood();
}
frame++;
loop();
})
})();
</script>
</body>
</html>