如何使用 angular 7 缩放 chart.js 中的图表

Question

我有一个 line-chart，我想缩放它但无法缩放。这是我的代码

let ctx = document.getElementById('myChart')

let chart = new Chart(ctx, {
      type: 'line',
      data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [{
          label: '# of Votes',
          data: [7, 10, 3, 5, 2, 3],
          fill: true,
          backgroundColor: 'orange',
          borderColor: 'green',
          pointBorderColor: 'red',
          pointBackgroundColor: 'red'
        }]
      },
      options: {
        plugins: {
          pan: {
            enabled: true,
            mode: 'x',
            onPan: function () { console.log('I was panned!!!'); }
          },
          zoom: {
            enabled: true,
            drag: true,
            mode: 'x',
            onZoom: function () { console.log('I was zoomed!!!'); }
          },
        },
        responsive: true,
      }
    })

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>

<div class="row">
    <div class="col d-flex justify-content-center">
        <canvas id="myChart" style="max-width:95%;height:300px !important;"></canvas>
    </div>
</div>

我已将以下 plugin 用于 zooming

https://github.com/chartjs/chartjs-plugin-zoom#readme

我还在我的项目中包含了 hammerjs 和 angular/animations。

更新

为什么 typescript 不知道 pan 和 zoom？

// package.json
"chart.js": "^2.7.3",
"chartjs-plugin-zoom": "^0.6.6",

Answer 1

缩放选项应在 options 而不是 options.plugins 设置下配置。

  options: {
    pan: {
      enabled: true,
      mode: 'x',     
    },
    zoom: {
      enabled: true,         
      mode: 'x',     
    },
    responsive: true
  }

看到这个 fiddle -> http://jsfiddle.net/3sx8zon2/2/

Answer 2

首先你需要运行npm install chartjs-plugin-zoom用npm安装然后在您的 .ts 文件中执行 import chartjs-plugin-zoom 并像这样编写插件：

    plugins: {
      zoom: {
        pan: {
          enabled: true,
          mode: 'x'
        },
        zoom: {
          enabled: true,
          mode: 'x'
        }
      }
    },

Answer 3

安装chart.js和chartjs-plugin-zoom

npm i chart.js -s
npm i chartjs-plugin-zoom -s

在Component.ts文件中导入图表和chartjs-plugin-zoom

import { Chart } from 'chart.js';
import 'chartjs-plugin-zoom';

加载图表的逻辑

let myChart = new Chart('mapId', {
type: 'bar',
data: {
    labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        backgroundColor: [
            'rgba(255, 99, 132, 0.2)',
            'rgba(54, 162, 235, 0.2)',
            'rgba(255, 206, 86, 0.2)',
            'rgba(75, 192, 192, 0.2)',
            'rgba(153, 102, 255, 0.2)',
            'rgba(255, 159, 64, 0.2)'
        ],
        borderColor: [
            'rgba(255, 99, 132, 1)',
            'rgba(54, 162, 235, 1)',
            'rgba(255, 206, 86, 1)',
            'rgba(75, 192, 192, 1)',
            'rgba(153, 102, 255, 1)',
            'rgba(255, 159, 64, 1)'
        ],
        borderWidth: 1
    }]
},
options: {
    scales: {
        yAxes: [{
            ticks: {
                beginAtZero: true
            }
        }]
    }
},
    plugins: {
      zoom: {
        pan: {
          enabled: true,
          mode: 'xy'
        },
        zoom: {
          enabled: true,
          mode: 'xy'
        }
      }
    }
  }
});
myChart.render();

在Component.html

<canvas id="mapId"></canvas>

Answer 4

我用过并且工作正常（Angular 12 - Chartjs 3.5.0）：
1.

npm i chart.js -s
npm i chartjs-plugin-zoom -s

.2

import 'hammerjs';
import zoomPlugin from 'chartjs-plugin-zoom';
Chart.register(zoomPlugin);

render: Chart;
this.render = new Chart(ctx, {type: 'line',
  data: {
    labels: xxxxxxxx,
    datasets: [
    ......
  ]
  },
  options: {
    responsive: true,
    interaction: {
      mode: 'index',
      intersect: false,
    },
    plugins: {
      zoom: {
        zoom: {
          wheel: {
            enabled: true,
          },
          pinch: {
            enabled: true
          },
          mode: 'xy',
        },
        pan: {
          enabled: true,
          mode: 'xy',
        },
      }
    }
  },

}

如何使用 angular 7 缩放 chart.js 中的图表

How to zoom charts in chart.js using angular 7

chart.js

angular

angular7