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October 27, 2017 00:08
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a canvas game, based on a tutorial by gamekedo
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>game</title> | |
</head> | |
<body> | |
<script> | |
hiscore = score = 1000; | |
player = { | |
x: 100, | |
y: 100, | |
size: 30, | |
speed: 15 | |
}; | |
mob = { | |
x: 0, | |
y: 0, | |
items: [], | |
size: 25, | |
speed: 5 | |
}; | |
bullet = { | |
x: 0, | |
y: 0, | |
items: [], | |
size: 4, | |
speed: 7 | |
}; | |
var _t; | |
window.onload = function() { | |
canvas=document.createElement("canvas"); | |
canvas.width=640; | |
canvas.height=480; | |
document.body.appendChild(canvas); | |
context=canvas.getContext("2d"); | |
setInterval(update, 1000 / 30); | |
setInterval(spawn, 2000); | |
document.addEventListener('keydown', keyPush); | |
} | |
function spawn() { | |
mob.items.push({x:canvas.width, y:Math.random()*canvas.height}); | |
} | |
function update() { | |
context.fillStyle="black"; | |
context.fillRect(0, 0, canvas.width, canvas.height); | |
context.fillStyle="white"; | |
context.fillRect(player.x-player.size / 2, player.y-player.size / 2, player.size, player.size); | |
context.fillStyle="lime"; | |
for(var s=0;s<bullet.items.length;s++ ) { | |
bullet.items[s].x += bullet.size; | |
context.fillRect(bullet.items[s].x - bullet.size / 2, bullet.items[s].y - bullet.size / 2, bullet.size, bullet.size); | |
for(var e=mob.items.length-1; e>=0; e--) { | |
var dx = Math.abs(mob.items[e].x - bullet.items[s].x); | |
var dy = Math.abs(mob.items[e].y - bullet.items[s].y); | |
var dist = Math.sqrt(dx*dx + dy*dy); | |
if(dist < (bullet.size + mob.size) / 2) { | |
bullet.items.splice(e, 1); | |
mob.items.splice(e, 1); | |
score += 10; | |
mob.speed += 0.75; | |
} | |
} | |
} | |
context.fillStyle="red"; | |
for(var e=0;e<mob.items.length; e++ ) { | |
mob.items[e].x -= mob.speed; | |
if (mob.items[e].x < mob.size && mob.items[e].x > 0) { // missed | |
if (_t) clearTimeout(_t); | |
_t = setTimeout(function () { score -= 25}, 1000/30); | |
} | |
context.fillRect(mob.items[e].x - mob.size / 2, mob.items[e].y - mob.size / 2, mob.size, mob.size); | |
var dx=Math.abs(mob.items[e].x - player.x); | |
var dy=Math.abs(mob.items[e].y - player.y); | |
var dist=Math.sqrt(dx*dx + dy*dy); | |
if ((dist < (player.size + mob.size) / 2) || score < 0) { | |
// game ends | |
if (score > hiscore) hiscore = score; | |
score = 1000; | |
mob.speed = 5; | |
bullet.items = []; | |
mob.items = []; | |
player.x = player.y = 100; | |
break; | |
} | |
} | |
context.font = "20pt Arial"; | |
context.fillStyle = "yellow"; | |
context.fillText("Score: " + score, 10, 30); | |
context.fillText("High Score: " + hiscore, 400, 30); | |
} | |
function keyPush(evt) { | |
switch(evt.keyCode) { | |
case 32: | |
bullet.items.push({x:player.x, y:player.y}); | |
score--; | |
break; | |
case 37: | |
player.x -= player.speed; | |
break; | |
case 38: | |
player.y -= player.speed; | |
break; | |
case 39: | |
player.x += player.speed; | |
break; | |
case 40: | |
player.y += player.speed; | |
break; | |
} | |
} | |
</script></body> | |
</html> |
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