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snake.html
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<head>
<style>
.flex-container {
display: flex;
width: 100%;
height: 30%;
}
.flex-item {
margin-left: auto;
margin-right: auto;
margin-bottom: auto;
}
</style>
</head>
<body>
<p id="score" style="text-align:center; font-size:800%; background-color:green; color:bisque">5</p>
<div class="flex-container">
<div class="flex-item">
<canvas id="gc" width="400" height="400"></canvas>
</div>
</div>
<script>
window.onload=function() {
canv=document.getElementById("gc");
ctx=canv.getContext("2d");
document.addEventListener("keydown",keyPush);
setInterval(game,1000/15);
}
px=py=10;
gs=tc=20;
ax=ay=15;
xv=yv=0;
trail=[];
tail = 5;
function game() {
px+=xv;
py+=yv;
if(px<0) {
px= tc-1;
}
if(px>tc-1) {
px= 0;
}
if(py<0) {
py= tc-1;
}
if(py>tc-1) {
py= 0;
}
ctx.fillStyle="black";
ctx.fillRect(0,0,canv.width,canv.height);
ctx.fillStyle="lime";
for(var i=0;i<trail.length;i++) {
ctx.fillRect(trail[i].x*gs,trail[i].y*gs,gs-2,gs-2);
if(trail[i].x==px && trail[i].y==py) {
tail = 5;
}
}
trail.push({x:px,y:py});
while(trail.length>tail) {
trail.shift();
}
if(ax==px && ay==py) {
tail++;
document.getElementById("score").innerHTML = tail;
ax=Math.floor(Math.random()*tc);
ay=Math.floor(Math.random()*tc);
}
ctx.fillStyle="red";
ctx.fillRect(ax*gs,ay*gs,gs-2,gs-2);
}
function keyPush(evt) {
switch(evt.keyCode) {
case 37:
xv=-1;yv=0;
break;
case 38:
xv=0;yv=-1;
break;
case 39:
xv=1;yv=0;
break;
case 40:
xv=0;yv=1;
break;
}
}
</script>
</body>