funAreaSelectPlus.js
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import React, { Component } from 'react';
import FunAreaSelect from "../funAreaSelect/funAreaSelect.js"
export default class FunAreaSelectPlus extends Component {
constructor() {
super();
this.state = {
id: new Date().getTime() + "waiceng",
list: [],
disabled: "false",//判断是否可以移动 false是可以移动
circleRadius: 5,//圆半径
circleBorderWidth: 2,//圆边线的半径宽
circleBorderColor: "#28B1D9",//圆边线的颜色
circleInColor: "#28B1D9",//圆里里面的颜色
circleSelectColor: "#FFF",
lineColor: "#28B1D9",//线的颜色
lineWidth: 2,//线的宽度
areaColor: "rgba(40, 177, 217, 0.2)",//选中区域颜色
disabled: "false",//判断是否可以移动 false是可以移动
title: "",//文字的内容
titleColor: "#000",//文字的颜色
titleFont: "14px bold 黑体",//文字的字体
titleLineHeight: "",//文字的行高
position: [10, 10],//文字的位置
}
}
static getDerivedStateFromProps(props, state) {
var obj = {};
for (var key in props) {
if (props[key] && props[key] !== state[key]) {
if(typeof props[key] === "object"){
obj[key] = JSON.parse(JSON.stringify(props[key]))
}else{
obj[key] = props[key]
}
}
}
if (Object.keys(obj).length > 0) {
return obj;
} else {
return null
}
}
componentDidMount() {
this.selectIndex = this.state.list.length-1;
this.selectArea();
}
clickIt() {
let { list } = this.state;
if (list.length === 0) {
list.push({
id: new Date().getTime(),
mode: "polygon"
})
} else {
var boo = this.refs[list[list.length - 1].id + list[list.length - 1].mode].isNull()//判断画布是否为空
if (boo) {//画布为空
console.log("画布为空")
} else if (!list[list.length - 1].serviceData) {
console.log("没有保存")
} else {
this.selectIndex = list.length;
if (list[list.length - 1].mode === "polygon") {
list.push({
id: new Date().getTime(),
mode: "react"
})
} else {
list.push({
id: new Date().getTime(),
mode: "polygon"
})
}
}
}
this.setState({
list: list
},()=>{
this.props.change(list)
})
}
change(val) {//保存后把最后一个放入这个list中储存，这样可以判断是否储存，点击的时候是否在点内
let { list } = this.state;
console.log(this.selectIndex)
list[this.selectIndex].serviceData = JSON.parse(JSON.stringify(val));
this.list = list
this.setState({ list: list})
this.props.change(list)
}
selectArea() {//选中区域z-index应该增大放在最上面
let { id } = this.state;
var waiceng = document.getElementById(id);
waiceng.onclick = (e) => {
let {list} = this.state;
// let list = this.list
var left = e.layerX
var top = e.layerY
this.indexflag = false;//这里是为了防止点击到重复的区域导致无法选区的情况
for (var i = 0; i < list.length; i++) {
if (list[i].serviceData) {
var myRef = this.refs[list[i].id + list[i].mode].state.id;//获取内部id
if (this.isInPolygon([left, top], JSON.parse(JSON.stringify(list[i].serviceData)), this.refs[list[i].id + list[i].mode][myRef])) {//选中之后放在最上层
var id = this.refs[list[i].id + list[i].mode][myRef].state.id
if (this.indexflag) {
document.getElementById(id).style.zIndex = 0
} else {
document.getElementById(id).style.zIndex = 99
this.indexflag = true
}
this.selectIndex = i;
} else {
var id = this.refs[list[i].id + list[i].mode][myRef].state.id
document.getElementById(id).style.zIndex = 0
}
}
}
}
}
isInPolygon(checkPoint, polygonPoints, childEl) {//判断多边形是否在点内
var counter = 0;
var xinters;
var p1, p2;
var pointCount = polygonPoints.length;
p1 = polygonPoints[0];
for (var i = 1; i <= pointCount; i++) {
p2 = polygonPoints[i % pointCount];
if (
checkPoint[0] > Math.min(p1[0], p2[0]) &&
checkPoint[0] <= Math.max(p1[0], p2[0])
) {
if (checkPoint[1] <= Math.max(p1[1], p2[1])) {
if (p1[0] != p2[0]) {
xinters =
(checkPoint[0] - p1[0]) *
(p2[1] - p1[1]) /
(p2[0] - p1[0]) +
p1[1];
if (p1[1] == p2[1] || checkPoint[1] <= xinters) {
counter++;
}
}
}
}
p1 = p2;
}
if (counter % 2 == 0) {
if (childEl.selectBox(checkPoint[0], checkPoint[1])) {
return true;
}
return false;
} else {
return true;
}
}
render() {
let { id, list, disabled, circleRadius,
circleBorderWidth,
circleBorderColor,
circleInColor,
circleSelectColor,
lineColor,
lineWidth,
areaColor,
title,
titleColor,
titleFont,
titleLineHeight,
position } = this.state;
return (
<div id={id} style={{ width: "100%", height: "100%", position: "relative" }}>
<button style={{ position: "absolute", right: "-20px", top: "0" }} onClick={() => this.clickIt()}>添加</button>
{
list.map((item, index) => {
return <FunAreaSelect
disabled={disabled}
circleRadius={circleRadius}
circleBorderWidth={circleBorderWidth}
circleBorderColor={circleBorderColor}
circleSelectColor={circleSelectColor}
circleInColor={circleInColor}
lineColor={lineColor}
lineWidth={lineWidth}
areaColor={areaColor}
title={title}
titleColor={titleColor}
titleFont={titleFont}
titleLineHeight={titleLineHeight}
position={position} key={index} serviceData={item.serviceData} ref={item.id + item.mode} mode={item.mode} change={(val) => this.change(val)}></FunAreaSelect>
})
}
</div>)
}
}