canvas圆周动画
圆周运动
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<!DOCTYPE html>
<html>
<head lang=
"en"
>
<meta charset=
"UTF-8"
>
<title></title>
</head>
<body>
<canvas width=
"600"
height=
"600"
id=
"race"
style=
"border:1px solid red;"
></canvas>
<script>
var
race = document.getElementById(
'race'
);
var
cxt = race.getContext(
'2d'
);
var
ang = 0;
var
speed = 1;
var
sAng = 0;
function
draw() {
cxt.save();
cxt.translate(300, 300);
cxt.save();
cxt.beginPath();
cxt.fillStyle =
'#CCA548'
;
cxt.arc(0, 0, 220, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.restore();
cxt.save();
cxt.beginPath();
cxt.fillStyle =
'white'
;
cxt.arc(0, 0, 200, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.restore();
cxt.save();
cxt.rotate(ang*Math.PI/180);
ang += speed;
//speed += 1;
cxt.fillStyle =
'#CDC9A5'
;
cxt.fillRect(210, -40, 40, 80);
cxt.strokeRect(210, -40, 40, 80);
cxt.fillStyle =
'white'
;
cxt.fillRect(230, -20, 10, 10);
cxt.fillRect(230, 10, 10, 10);
cxt.save();
cxt.translate(210, -20);
cxt.fillStyle =
'#000'
;
cxt.beginPath();
cxt.arc(0, 0,10, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.fillStyle =
'white'
;
cxt.beginPath();
cxt.arc(0, 0, 2, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.save();
if
(sAng > 360){
sAng = 0;
}
cxt.rotate(sAng*Math.PI/180);
sAng += 4;
cxt.strokeStyle =
'white'
;
cxt.strokeRect(-5*Math.sqrt(2), -5*Math.sqrt(2), 10*Math.sqrt(2), 10*Math.sqrt(2));
cxt.restore();
cxt.restore();
cxt.save();
cxt.translate(210, 20);
cxt.fillStyle =
'#000'
;
cxt.beginPath();
cxt.arc(0, 0,10, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.save();
cxt.rotate((sAng+45)*Math.PI/180);
cxt.strokeStyle =
'white'
;
cxt.strokeRect(-5*Math.sqrt(2), -5*Math.sqrt(2), 10*Math.sqrt(2), 10*Math.sqrt(2));
cxt.restore();
cxt.restore();
cxt.beginPath();
cxt.arc(210, 20, 2, 0, 360*Math.PI/180,
false
);
cxt.fill();
cxt.closePath();
cxt.restore();
cxt.restore();
}
//draw();
function
animate() {
cxt.clearRect(0, 0, 600, 600);
draw();
requestAnimationFrame(animate);
}
requestAnimationFrame(animate);
</script>
</body>
</html>
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