效果图：
var deg = 0;
var r = 30;
var rl = 100;
function drawTaiji() {
var canvas = document.getElementById(‘myCanvas’);
var context = canvas.getContext(‘2d’);
var colorA = “rgb(0, 0, 0)”;
var colorB = “red”;
var px =Math.sin(deg)*r;
var py =Math.cos(deg)*r;
context.clearRect(0, 0, 300, 300);
context.beginPath();
context.fillStyle = colorA;
context.arc(rl, rl, 60, 0.5 * Math.PI +deg, 1.5 * Math.PI +deg, true);
context.closePath();
context.fill();
context.fillStyle = colorB;
context.beginPath();
context.arc(rl, rl, 60, 1.5* Math.PI +deg, 0.5 * Math.PI +deg, true);
context.closePath();
context.fill();
context.fillStyle = colorB;
context.beginPath();
context.arc(rl+px, rl-py, 30, 0.5 * Math.PI + deg, 1.5 * Math.PI + deg, true);
context.closePath();
context.fill();
context.fillStyle = colorA;
context.beginPath();
context.arc(rl-px, rl+py, 30, 1.5 * Math.PI + deg, 0.5 * Math.PI + deg, true);
context.closePath();
context.fill();
context.fillStyle = colorA;
context.beginPath();
context.arc(rl+px, rl-py, 8, 0, 2 * Math.PI, true);
context.closePath();
context.fill();
context.fillStyle = colorB;
context.beginPath();
context.arc(rl-px, rl+py, 8, 0, 2 * Math.PI, true);
context.closePath();
context.fill();
deg +=0.1;
}
setInterval(drawTaiji, 100);
方法二：
复制代码代码如下:
your browser does not support the canvas tag
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