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tanks.html
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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css">
<style>
#stage {
width: 700px;
height: 400px;
background-color: #ccc;
overflow: hidden;
}
#aim { width: 200px; }
#tanks {
width: 150px;
height: 100px;
background-color: green;
position: absolute;
top: 200px;
left: 130px;
}
#barrel {
height: 100px;
width: 10px;
position: absolute;
top: -50px;
left: 70px;
background-color: blue;
-webkit-transform-origin: bottom center;
}
#shoot {
position: absolute;
top: 40px;
left: 50px;
height: 80px;
width: 120px;
background-color: red;
}
#power {
position: absolute;
left: 20px;
top: 40px;
height: 150px;
width: 20px;
background-image: linear-gradient(bottom, rgb(250,0,0) 100%, rgb(213,227,22) 0%);
background-image: -o-linear-gradient(bottom, rgb(250,0,0) 100%, rgb(213,227,22) 0%);
background-image: -moz-linear-gradient(bottom, rgb(250,0,0) 100%, rgb(213,227,22) 0%);
background-image: -webkit-linear-gradient(bottom, rgb(250,0,0) 100%, rgb(213,227,22) 0%);
background-image: -ms-linear-gradient(bottom, rgb(250,0,0) 100%, rgb(213,227,22) 0%);
background-image: -webkit-gradient(
linear,
left bottom,
left top,
color-stop(1, rgb(250,0,0)),
color-stop(0, rgb(213,227,22))
);
}
#power div {
position: absolute;
bottom: 0;
height: 2px;
width: 30px;
left: -5px;
background-color: #000;
}
#target {
width: 150px;
height: 100px;
background-color: orange;
position: absolute;
top: 200px;
left: 500px;
}
#bullet {
width: 10px;
height: 10px;
background-color: red;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
position: absolute;
}
</style>
</head>
<body>
<div id="stage">
<div id="aim"></div>
<div id="power"><div></div></div>
<div id="shoot"></div>
<div id="tanks"><div id="barrel"></div></div>
<div id="target"></div>
<div id="bullet"></div>
</div>
<script>
var aim = 0,
power = 0,
powerIncrease,
fireInterval;
$("#aim").slider({
min: -70,
max: 70,
slide: function(e, ui) {
aim = ui.value;
$("#barrel").css("-webkit-transform", "rotateZ(" + aim + "deg)");
}
});
$("#shoot").mousedown(function() {
powerIncrease = setInterval(function() {
$("#power div").css("bottom", (power++ * 2));
}, 20);
}).mouseup(function() {
clearInterval(powerIncrease);
powerIncrease = null;
$("#power div").css("bottom", 0);
fire();
});
function fire() {
var $bullet = $("#bullet");
var top = $("#barrel").offset().top,
up = (90 - aim) * power / 10,
right = (power * aim) / 1000;
var kat = 250 - top;
var left = Math.sqrt(Math.pow(100, 2) - Math.pow(kat, 2)) + $("#barrel").offset().left;
$bullet.css({
top: top,
left: left
}).show();
fireInterval = setInterval(function() {
right -= right * 0.001;
left += right;
top -= (up-- / 100);
$bullet.css({
top: top,
left: left
});
checkPosition(top, left);
}, 1);
}
function checkPosition(top, left) {
var miss,hit;
if (top >= 300) {
miss = true;
$("#target").text("missed me!");
}
if (top > 200 && top < 300 &&
left > 500 && left < 650) {
hit = true;
$("#target").text("auch!");
}
if (miss || hit) {
clearInterval(fireInterval);
fireInterval = null;
power = 0;
}
}
</script>
</body>
</html>