css - Device div screens overlapping, how do I fix? -


how change keyboard functions onscreen joystick? building html5 game , im lost how add joystick.

below code needs help. thank in advance :)

function init() {   canvas = document.getelementbyid('canvas');   ctx = canvas.getcontext('2d');   enemy = new image();   enemy.src = '8bit_enemy.png';   ship = new image();   ship.src = 'ship.png';   starfield = new image();   starfield.src = 'starfield.jpg';   document.addeventlistener('keydown', keydown, false);   document.addeventlistener('keyup', keyup, false);         canvas.addeventlistener('click', gamestart, false);   gameloop(); }  function gamestart() {   gamestarted = true;   canvas.removeeventlistener('click', gamestart, false); }  //the main function of game, calls other functions needed make game run function gameloop() {   clearcanvas();   drawstarfield()   if (alive && gamestarted && lives > 0) {    hittest();     shipcollision();     movelaser();     moveenemies();     drawenemies();     drawship();     drawlaser();   }   scoretotal();   game = settimeout(gameloop, 1000 / 30); }  //checks see key has been pressed , either move ship or fire laser function keydown(e) {   if (e.keycode == 39) rightkey = true;   else if (e.keycode == 37) leftkey = true;   if (e.keycode == 38) upkey = true;   else if (e.keycode == 40) downkey = true;   if (e.keycode == 88 && lasers.length <= lasertotal) lasers.push([ship_x + 25, ship_y - 20, 4, 20]); }  //checks see if pressed key has been released , stops ships movement if has function keyup(e) {   if (e.keycode == 39) rightkey = false;   else if (e.keycode == 37) leftkey = false;   if (e.keycode == 38) upkey = false;   else if (e.keycode == 40) downkey = false; }  window.onload = init;

you need this:

function dokeydown(e){              //====================             //  w key             //====================             if (e.keycode == 87) {                 clearcanvas();                 y = y - 10;                 canvas_context.fillrect(x, y, 50, 30);             }              //====================             //  s key             //====================             if (e.keycode == 83) {                 clearcanvas();                 y = y + 10;                 canvas_context.fillrect(x, y, 50, 30);             }              //====================             //  key             //====================             if (e.keycode == 65) {                 clearcanvas();                 x = x - 10;                 canvas_context.fillrect(x, y, 50, 30);             }              //====================             //  d key             //====================             if (e.keycode == 68) {                 clearcanvas();                 x = x + 10;                 canvas_context.fillrect(x, y, 50, 30);             }          }          function clearcanvas() {             canvas.width = canvas.width;         }

the full explanation , code examples can found here , demo here


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