帮我写一段angular的代码 内容是一个线形统计图 x轴是开始日期到结束日期 y轴是实时用电量 开始日期和结束日期可以分别在两个日期选择器上手动选择
时间: 2023-06-04 12:07:48 浏览: 65
好的,以下是一段Angular代码实现你所需的功能:
HTML代码:
```
<div>
<mat-form-field>
<mat-label>开始日期</mat-label>
<input matInput [matDatepicker]="picker1" (dateChange)="onChangeDates()">
<mat-datepicker-toggle matSuffix [for]="picker1"></mat-datepicker-toggle>
<mat-datepicker #picker1></mat-datepicker>
</mat-form-field>
<mat-form-field>
<mat-label>结束日期</mat-label>
<input matInput [matDatepicker]="picker2" (dateChange)="onChangeDates()">
<mat-datepicker-toggle matSuffix [for]="picker2"></mat-datepicker-toggle>
<mat-datepicker #picker2></mat-datepicker>
</mat-form-field>
</div>
<div style="width: 100%; height: 500px;">
<canvas #chart></canvas>
</div>
```
typescript代码:
```
import { Component, ViewChild, ElementRef } from '@angular/core';
import { Chart, ChartDataSets, ChartOptions, ChartType } from 'chart.js';
import { MatDatepickerInputEvent } from '@angular/material/datepicker';
@Component({
selector: 'app-chart-component',
templateUrl: './chart.component.html',
styleUrls: ['./chart.component.scss']
})
export class ChartComponent {
@ViewChild('chart') chartElement: ElementRef;
private chart: Chart;
private startDate: Date;
private endDate: Date;
ngOnInit() {
this.initializeChart();
}
private initializeChart() {
this.chart = new Chart(this.chartElement.nativeElement.getContext('2d'), {
type: 'line',
data: {
labels: [],
datasets: [{
label: '用电量',
data: [],
fill: true,
borderColor: '#0099ff',
backgroundColor: 'rgba(0, 153, 255, 0.2)',
borderWidth: 2
}]
},
options: {
responsive: true,
legend: {
display: true
},
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'day',
displayFormats: {
day: 'MM月DD日'
}
},
scaleLabel: {
display: true,
labelString: '日期'
},
ticks: {
beginAtZero: false
}
}],
yAxes: [{
scaleLabel: {
display: true,
labelString: '实时用电量'
},
ticks: {
beginAtZero: false
}
}]
}
}
});
}
private onChangeDates() {
this.chart.data.datasets[0].data = [];
this.chart.data.labels = [];
// 这里可以调用后端API,获取指定日期范围内的实时用电量数据
// 并将数据填充到chart的data中
// 每个data的格式为 {x: Date, y: number}
// 这里只是填充一些随机数据作为展示
const millisecondsInADay = 86400000;
const days = Math.floor((this.endDate.getTime() - this.startDate.getTime()) / millisecondsInADay);
for (let i = 0; i < days; i++) {
const x = new Date(this.startDate.getTime() + i * millisecondsInADay);
const y = Math.floor(Math.random() * 100);
this.chart.data.datasets[0].data.push({x: x, y: y});
this.chart.data.labels.push(x.toString());
}
this.chart.update();
}
private addStartDate(event: MatDatepickerInputEvent<Date>) {
this.startDate = event.value;
this.onChangeDates();
}
private addEndDate(event: MatDatepickerInputEvent<Date>) {
this.endDate = event.value;
this.onChangeDates();
}
}
```
以上代码实现将可选的时间范围和实时用电量显示在一个线型统计图中,时间范围可通过两个日期选择器进行手动选择。如需改进或者有其他问题,欢迎随时联系我。