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Html5 Canvas rotating Ninja darts tutorial

Source: Internet
Author: User
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Source:

The code is as follows Copy Code
<!doctype html>
<title> to endure the darts rotation | Bin Fruit Blog </title>
<style>
Body{overflow:hidden;background: #666;}
canvas{position:absolute;top:0;left:0;}
</style>
<body></body>
<script type= "Text/javascript" >
function g () {
var B = this;
B.D = function (a) {
B.create ();
B.A = A.A;
B.E ()
};
B.E = function () {
function A () {
function e () {
if (F < Math.PI * 8) {
f + + 0.1;
C.A + = d * 0.1;
C.b.clearrect (0, 0, 400, 400);
C.C ();
C.timeout = settimeout (E, 10)
} else {
d =-D;
C.timeout = settimeout (A, 10)
}
}
var f = 0;
E ()
}
var d = 1,
c = b;
A ()
};
B.C = function () {
var a = b.b;
A.save ();
A.translate (200, 200);
A.rotate (B.A);
if (B.A = = 0) B.A = 0.0010;
A.scale (B.A/10, B.A/10);
A.strokestyle = "#333";
A.fillstyle = "#eee";
A.linewidth = 1;
A.beginpath ();
A.moveto (20,-20);
A.lineto (80, 0);
A.lineto (20, 20);
A.lineto (0, 80);
A.lineto (-20, 20);
A.lineto (-80, 0);
A.lineto (-20,-20);
A.lineto (0,-80);
A.lineto (20,-20);
A.translate (0, 0);
A.arc (0, 0, 8, 0, Math.PI * 2, true);
A.stroke ();
A.fill ();
A.restore ()
};
B.create = function () {
var a = document.createelement ("Canvas");
A.width = 400;
A.height = 400;
b.b = A.getcontext ("2d");
Document.body.appendChild (a)
}
}
Window.onload = function () {
for (var b = 0; b < b++) (new G). D ({
A:B * 0.1
})
};
</script>

The darts are made up of straight lines and background fills, and the edges are transparent and well handled.

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