JS计算圆周上N个等分点的坐标

算法如下

var point = []; //结果
/*
* 求圆周上等分点的坐标
* ox,oy为圆心坐标
* r为半径
* count为等分个数
*/
function getPoint(r, ox, oy, count){
    var radians = (Math.PI / 180) * Math.round(360 / count), //弧度
        i = 0;
    for(; i < count; i++){
        var x = ox + r * Math.sin(radians * i),
            y = oy + r * Math.cos(radians * i);

        point.unshift({x:x,y:y}); //为保持数据顺时针
    }
}