将DIV排列成圆圈并向外旋转它们

Question

基本上我已经设法将我的DIV元素布局成圆形,但是我还没有设法计算出如何计算旋转度需要让它们从圆心向外朝向.

$(document).ready(function(){
                var elems = document.getElementsByClassName('test_box');

                var increase = Math.PI * 2 / elems.length;
                var x = 0, y = 0, angle = 0;

                for (var i = 0; i < elems.length; i++) {
                    var elem = elems[i];
                    // modify to change the radius and position of a circle
                    x = 400 * Math.cos(angle) + 700;
                    y = 400 * Math.sin(angle) + 700;
                    elem.style.position = 'absolute';
                    elem.style.left = x + 'px';
                    elem.style.top = y + 'px';
                    //need to work this part out
                    var rot = 45;
                    elem.style['-moz-transform'] = "rotate("+rot+"deg)";
                    elem.style.MozTransform = "rotate("+rot+"deg)";
                    elem.style['-webkit-transform'] = "rotate("+rot+"deg)";
                    elem.style['-o-transform'] = "rotate("+rot+"deg)";
                    elem.style['-ms-transform'] = "rotate("+rot+"deg)";
                    angle += increase;
                    console.log(angle);
                }
            });

有没有人知道如何做到这一点.

干杯-C

Answer 1

注意,rot取决于angle,除了angle是弧度.

干,所以要么从角度转换为腐烂:

// The -90 (degrees) makes the text face outwards.
var rot = angle * 180 / Math.PI - 90;

或者只是在设置样式时使用角度(但使用弧度作为单位),并删除rot声明:

// The -0.5*Math.PI (radians) makes the text face outwards.
elem.style.MozTransform = "rotate("+(angle-0.5*Math.PI)+"rad)";