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<html>
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<head>
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<script type="text/javascript">
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player_pos = [300, 0];
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enemy_pos = [300, 0];
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pewpew = 0;
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document.onkeydown = onKeyDown;
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function onKeyDown(e) {
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e = e || window.event;
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var player = document.getElementById("player");
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if (e.keyCode == '37') { // left
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player_pos[0] -= 10;
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}
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if (e.keyCode == '39') { // right
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player_pos[0] += 10;
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}
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if (e.keyCode == '32') { // space = fire
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shoot(player_pos);
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}
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}
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shoots = [];
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function shoot(player_pos) {
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shoots[shoots.length] = [player_pos[0], 500];
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// pewpew = 5;
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}
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function isCollided(a, b) {
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var a_left = parseInt(a.style.left);
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var a_right = a_left + a.offsetWidth;
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var a_top = parseInt(a.style.top);
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var a_bottom = a_top + a.offsetHeight;
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var b_left = parseInt(b.style.left);
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var b_right = b_left + b.offsetWidth;
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var b_top = parseInt(b.style.top);
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var b_bottom = b_top + b.offsetHeight;
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return !(
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(a_left > b_right) ||
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(a_right < b_left) ||
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(a_top > b_bottom) ||
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(a_bottom < b_top)
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);
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}
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function gameLoop() {
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// detect collision
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var enemydiv = document.getElementById("enemy");
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for(var i = 0; i < shoots.length; i++) {
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if (shoots[i]) {
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var shootdiv = document.getElementById('shoot' + i);
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if (shootdiv && isCollided(shootdiv, enemydiv)) {
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pewpew = 5;
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}
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}
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}
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// render shoots
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for(var i = 0; i < shoots.length; i++) {
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if (shoots[i]) {
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var shootdiv = document.getElementById('shoot' + i);
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if (!shootdiv) {
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shootdiv = document.createElement('div');
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shootdiv.setAttribute('id', 'shoot' + i);
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shootdiv.setAttribute('class', 'shoot');
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shootdiv.innerHTML = '|';
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var body = document.getElementsByTagName('body')[0];
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body.appendChild(shootdiv);
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}
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shootdiv.style.left = shoots[i][0];
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shootdiv.style.top = shoots[i][1];
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} else {
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if (deldiv = document.getElementById('shoot' + i)) {
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var body = document.getElementsByTagName('body')[0];
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body.removeChild(deldiv);
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}
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}
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}
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// render pew pew
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var pewpewdiv = document.getElementById("pewpew");
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if (pewpew > 0) {
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pewpewdiv.innerHTML = "pew! pew!";
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} else {
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pewpewdiv.innerHTML = "";
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}
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// render player
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var playerdiv = document.getElementById("player");
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playerdiv.style.left = player_pos[0];
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// FIXME playerdiv.style.top = player_pos[1];
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// render enemy
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var enemydiv = document.getElementById("enemy");
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enemydiv.style.left = enemy_pos[0];
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enemydiv.style.top = enemy_pos[1];
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// animate shoots
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for(var i = 0; i < shoots.length; i++) {
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if (shoots[i]) {
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shoots[i][1] -= 20;
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if (shoots[i][1] < 0) {
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delete(shoots[i]);
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}
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}
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}
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// animate pew pew
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if (pewpew > 0) {
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pewpew -= 1;
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}
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// animate enemy
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var min = -50;
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var max = +50;
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var off = min + parseInt(Math.random() * (max-min));
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enemy_pos[0] += off;
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if (enemy_pos[0] < 0) enemy_pos[0] = 0;
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if (enemy_pos[0] > 600) enemy_pos[0] = 600;
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setTimeout("gameLoop()", 100);
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}
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</script>
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<style type="text/css">
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* {
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font-size: 2em;
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color: #ff00ff;
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font-family: helvetica, arial;
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}
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#player {
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position: absolute;
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bottom: 10%;
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/* -webkit-transform: rotate(90deg);
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-moz-transform: rotate(90deg); */
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}
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#enemy {
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position: absolute;
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top: 10%;
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/* -webkit-transform: rotate(90deg);
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-moz-transform: rotate(90deg); */
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border-style: solid; border-width: 1px;
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}
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#pewpew {
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position:absolute;
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top: 10%;
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right: 10%;
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}
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div.shoot {
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position:absolute;
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border-style: solid; border-width: 1px;
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}
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</style>
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</head>
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<body onload="gameLoop();">
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<div id="enemy">3</div>
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<div id="player"><</div>
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<div id="pewpew"></div>
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</body>
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</html>
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