areaSelete.js
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import React, { Component } from "react"
import "./areaSelete.css"
export default class AreaSelete extends Component {
constructor() {
super();
this.state = {
id: new Date().getTime() + Math.floor(Math.random() * (10000 - 1)) + 1,
mode:"",
width: "100px",
height: "100px",
circleRadius: 10,//圆半径
circleBorderWidth: 4,//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
serviceData: []
}
}
static getDerivedStateFromProps(props, state) {
var obj = {};
for(var key in props){
if(props[key]&&props[key]!==state[key]){
obj[key] = props[key]
}
}
if(Object.keys(obj).length>0){
return obj;
}else{
return null
}
}
shouldComponentUpdate(nextProps){
if(this.props.serviceData.length !== nextProps.serviceData){
return true
}else{
return false
}
}
componentDidMount() {
this.init()
window.onresize = this.init.bind(this)
}
init() {
this.setCanvasSize();//根据父盒子宽高大小设置画布的大小
}
setCanvasSize() {
let { id } = this.state;
var canvasEl = document.getElementById(id)
var parentEl = canvasEl.parentNode;
var parentWidth = parentEl.offsetWidth;//父标签的宽度
var parentHeight = parentEl.offsetHeight;//父标签的高度
this.setData({
width: parentWidth + "px",
height: parentHeight + "px"
})
}
draw() {
let { id, serviceData, width, height,mode } = this.state;
var canvasEl = document.getElementById(id)
var ctx = canvasEl.getContext("2d");
ctx.clearRect(0, 0, parseFloat(width), parseFloat(height));
this.drawLine(ctx, serviceData);
this.drawCircleAll(ctx, serviceData);
// this.clickMove()//点击模式
// this.mouseMove()//鼠标移动模式
// this.touchMove()//手指触摸移动模式
if(mode === 'click'){
this.isontouchend()?this.touchMove():this.clickMove()
}else{
this.isontouchend()?this.touchMove():this.mouseMove()
}
}
isontouchend() {//判断是否支持触屏
return "ontouchend" in document ? true : false;
}
drawCircleAll(ctx, data) {//画所有圆
for (var i = 0; i < data.length; i++) {
this.drawCircle(ctx, data[i][0], data[i][1],this.selectedIndex===i)
}
}
drawCircle(ctx, x, y,selected) {//画单个圆
let { circleRadius, circleInColor, circleBorderColor, circleBorderWidth,circleSelectColor } = this.state
ctx.fillStyle = selected?circleSelectColor:circleInColor;//画里面
ctx.beginPath();
ctx.arc(x, y, parseInt(circleRadius) , 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
ctx.beginPath();//画外面的空心圆
ctx.arc(x, y, parseInt(circleRadius), 0, Math.PI * 2, true);
ctx.lineWidth = parseInt(circleBorderWidth);
ctx.strokeStyle = circleBorderColor;
ctx.stroke(); //画空心圆
ctx.closePath();
}
drawLine(ctx, data) {//画线
let { lineColor, lineWidth, areaColor } = this.state
ctx.beginPath();
for (var i = 0; i < data.length; i++) {
if (i === 0) {
ctx.moveTo(data[i][0], data[i][1]);
} else {
ctx.lineTo(data[i][0], data[i][1]);
}
}
ctx.lineWidth = parseInt(lineWidth);
ctx.strokeStyle = lineColor;
ctx.closePath();
ctx.fillStyle = areaColor;
ctx.fill();
ctx.stroke();
}
clickMove() {//鼠标点击移动
let { id, serviceData } = this.state;
var canvasEl = document.getElementById(id)
canvasEl.onclick = (e) => {
var left = e.layerX
var top = e.layerY
if (this.selectedIndex || this.selectedIndex === 0) {//此时已经选中了点
serviceData[this.selectedIndex] = [left, top]
this.selectedIndex = null
this.setData({
serviceData: serviceData
})
this.props.change(serviceData)
} else {
this.selectBox(left, top)
this.setData({
serviceData: serviceData
})
}
}
}
mouseMove() {//鼠标移动
let { id, serviceData } = this.state;
var canvasEl = document.getElementById(id)
canvasEl.onmousedown = (e) => {
var left = e.layerX
var top = e.layerY
if (this.selectBox(left, top)) {
canvasEl.onmousemove = (e) => {
serviceData[this.selectedIndex] = [e.layerX, e.layerY];
this.setData({
serviceData: serviceData
})
};
}
}
canvasEl.onmouseup = (e) => {
canvasEl.onmousemove = null;
this.selectedIndex = null;
this.setData({
serviceData: serviceData
})
var left = e.layerX
var top = e.layerY
if (this.selectBox(left, top)) {
this.props.change(serviceData)
}
};
}
touchMove() {//手指触摸移动
let { id, serviceData } = this.state;
var canvasEl = document.getElementById(id)
var parentEl = canvasEl.parentNode;
var pingmuTop = parentEl.getBoundingClientRect().top; //画布距离屏幕上面的距离 这里要计算出触摸距离当前画布的距离好进行移动
var pingmuLeft = parentEl.getBoundingClientRect().left; //画布距离屏幕左面的距离
canvasEl.ontouchstart = (e) => {
var left = e.touches[0].pageX - pingmuLeft
var top = e.touches[0].pageY - pingmuTop
if (this.selectBox(left, top)) {
canvasEl.ontouchmove = (e) => {
serviceData[this.selectedIndex] = [e.touches[0].pageX - pingmuLeft, e.touches[0].pageY - pingmuTop];
this.setData({
serviceData: serviceData
})
}
}
}
canvasEl.ontouchend = (e) => {
this.selectedIndex = null
canvasEl.ontouchmove = null;
this.setData({
serviceData: serviceData
})
var left = e.changedTouches[0].pageX - pingmuLeft
var top = e.changedTouches[0].pageY - pingmuTop
if (this.selectBox(left, top)) {
this.props.change(serviceData)
}
};
}
selectBox(x, y) {//判断是否选中
let { serviceData, circleRadius, circleBorderWidth } = this.state;
let rangeMax = circleRadius + circleBorderWidth;
this.selectedIndex = null;//选中点后把下面传过去
for (var i = 0; i < serviceData.length; i++) {
var dianX = serviceData[i][0];
var dianY = serviceData[i][1];
if ((dianX - x) * (dianX - x) + (dianY - y) * (dianY - y) < rangeMax * rangeMax) {
this.selectedIndex = i;//选中后返回下标然后返回真
return true
}
}
if (i == serviceData.length) {
return false
}
}
setData(data) {//设置值发生变化重新画
this.setState(data, () => {
this.draw()
})
}
render() {
let { id, width, height } = this.state;
return (<canvas id={id} width={width} height={height}></canvas>)
}
}