javascript - unwanted multiple bullets in html shooter -


i trying create simple game paddle shoots single bullet. reason, each key press produces 2 bullets instead of intended one.

how can have single bullet firing delay of few seconds before next one?

i have set counter between each bullet, not working.

the code is: 

/* canvas */ var canvas = document.getelementbyid("mycanvas"); var ctx = canvas.getcontext("2d");  /* input */ var rightpressed = false; var leftpressed = false; var spacepressed = false;  document.addeventlistener("keydown", keydownhandler, false); document.addeventlistener("keyup", keyuphandler, false);  function keydownhandler(e) {     if(e.keycode == 39) {         rightpressed = true;     }     else if(e.keycode == 37) {         leftpressed = true;     }       else if(e.keycode == 32) {         spacepressed = true;     } }  function keyuphandler(e) {     if(e.keycode == 39) {         rightpressed = false;     }     else if(e.keycode == 37) {         leftpressed = false;     }     else if(e.keycode == 32) {         spacepressed = false;     } }   /* paddle */ var paddle = {   "height": 10,   "width": 75,   "paddlex": (canvas.width - 75)/2 } ;   function drawpaddle() {   if(rightpressed && paddle["paddlex"] < canvas.width - paddle["width"]) {     paddle["paddlex"] = paddle["paddlex"] + 7;    }  else if(leftpressed && paddle["paddlex"] > 0) {     paddle["paddlex"] = paddle["paddlex"] - 7;  }     ctx.beginpath();     ctx.rect(paddle["paddlex"], canvas.height - paddle["height"], paddle["width"], paddle["height"]);     ctx.fillstyle = "#0095dd";     ctx.fill();     ctx.closepath(); };  /* bullets */ var bullets = [] ; var bulletdelaycounter = 30; var bulletdelayincrement = 1; var bulletdelay = 30;  function istriggerpressed() {  if (spacepressed) {     if (bulletdelaycounter > bulletdelay) {        newbullet(paddle["paddlex"] + (paddle["width"] / 2))        bulletdelaycounter = 0     }  } ;  } ;   function newbullet(x) {   y = (canvas.height - paddle["height"]) - 2   bullets.push({ "y": y, "x": x }); } ;   function drawbullet(x, y) {   ctx.beginpath();   ctx.arc(x, y, 1, 0, math.pi*2);   ctx.fillstyle = 'blue';   ctx.fill();   ctx.closepath(); } ;  function animatebullets() {   bulletdelaycounter = bulletdelaycounter + bulletdelayincrement;   istriggerpressed();     (b of bullets) {     drawbullet(b["x"], b["y"])     b["y"] = b["y"] - 4   } ;  } ;   /* game loop */ function draw() { ctx.clearrect(0, 0, canvas.width, canvas.height); drawpaddle(); animatebullets();  } ;  setinterval(draw, 1);


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