import * as THREE from '../lib/three.module.js'

let common = {
    handelPadding: (function() {
        //去除player左边和上面的宽高,因为pc的player左上有其他element  许钟文

        var pads = new Map() //记录下来避免反复计算

        return function(x, y, domE) {
            let pad

            let padInfo = pads.get(domE)
            if (padInfo) {
                if (domE.clientWidth == padInfo.width && domE.clientHeight == padInfo.height) {
                    pad = padInfo.pad
                }
            }
            if (!pad) {
                pad = {
                    x: this.getOffset('left', domE),
                    y: this.getOffset('top', domE)
                }

                pads.set(domE, {
                    width: domE.clientWidth,
                    height: domE.clientHeight,
                    pad
                })
            }

            return {
                x: x - pad.x,
                y: y - pad.y
            }
        }
    })(),

    getOffset: function(type, element, parent) {
        //获取元素的边距 许钟文
        var offset = type == 'left' ? element.offsetLeft : element.offsetTop
        if (!parent) parent = document.body
        while ((element = element.offsetParent)) {
            if (element == parent) break
            offset += type == 'left' ? element.offsetLeft : element.offsetTop
        }
        return offset
    }
}

export default common