如何获取元素的位置用css旋转 [英] How to get the position of element transformed with css rotate

问题描述

我遇到一个问题，在 rotate 过滤器应用后，获取一个div的位置。我有一个端点的位置，它的高度和它旋转的角度，但是在检查这个滤波器对MDN（[cos（angle）sin（angle）-sin（angle）cos（angle） 0 0]）我仍然不知道如何破解它。

I'm having a problem with getting the position of a div after rotate filter is applied to it. I have the position of one end, its height, and the angle by which it is rotated, but after checking what this filter actually does on MDN ("[cos(angle) sin(angle) -sin(angle) cos(angle) 0 0]") I still don't know how to crack it.

例如：

我感兴趣的div是虚线。当时的样式是：

The div I'm interested in is the dashed line. Its styling at that moment was :

left：80px; top：12px; height：69.5122px; width：2px; -moz-transform：rotate（-1.21366rad）;

（ top left 描述它的开始位置。）我想获得顶部 /

(top/left describe the position of its beginning.) I'm trying to get the top/left position of its end.

推荐答案

根据您当前的问题和您要求的确认：

Per your current Question and your requested confirmation of:

var x = termin.top + Math.cos(angle) * div.height;
var y = div.left + Math.sin(angle) * div.height;

此解决方案可以在此其他 SO回答 。

$ b b

The solution can be found in this other SO Answer for a different question, enhanced here:

// return an object with full width/height (including borders), top/bottom coordinates
var getPositionData = function(el) {
    return $.extend({
        width: el.outerWidth(false),
        height: el.outerHeight(false)
    }, el.offset());
};

// get rotated dimensions   
var transformedDimensions = function(el, angle) {
    var dimensions = getPositionData(el);
    return {
        width: dimensions.width + Math.ceil(dimensions.width * Math.cos(angle)),
        height: dimensions.height + Math.ceil(dimensions.height * Math.cos(angle))
    };
};

这是一个互动 jsFiddle getPositionData（）; 函数的实时更新。
您将能够看到

Here's an interactive jsFiddle that provides real-time updates for getPositionData(); function.
You'll be able to see the top and left values at the end of the CSS3 Rotation process you control.

参考：  jsFiddle

Reference:   jsFiddle

状态更新：上述jsFiddle适用于 0-90deg 所有角度和不同单位，例如 rad，grad和turn strong> 。

Status Update: The above jsFiddle works great for 0-90deg and can be approved upon for all angles and different units such as rad, grad, and turn.

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