Sizing and centering donut chart

Topic: Sizing and centering donut chart

anuragd7 asked 5 years ago

*_Expected behavior_*Hi I am using the donut chart and facing 2 problems.

I want to center the chart inside the card container, by moving the chart a little lower (see attached screenshot here). However when I do this I do not want to move the title of the chart.
I would like to increase the size of the chart but I am not able to change the size using the "size" attribute as described here. However whatever number I specify in the size attribute the chart does not seem to change in size.

My code is shown below

HTML

<div style="display: block">
  <canvas
    mdbChart
    [chartType]="chartType"
    [datasets]="chartData"
    [labels]="chartLabels"
    [colors]="chartColors"
    [options]="chartOptions"
    [legend]="true"
    (chartHover)="chartHovered($event)"
    (chartClick)="chartClicked($event)"
    size="50"
  >
  </canvas>
</div>

import { Component, OnInit, Input } from '@angular/core';

@Component({
  selector: 'app-donut-chart',
  templateUrl: './donut-chart.component.html',
  styleUrls: ['./donut-chart.component.scss']
})
export class DonutChartComponent implements OnInit {
  @Input() chartData: Array<any>; // data for plotting chart
  @Input() chartTitle: any; // title on top of chart
  @Input() backgroundColor: string[]; 
  @Input() hoverBackgroundColor: string[]; 
  chartType: string = 'doughnut';

  // chartData: Array<any>;

  chartLabels: Array<any> = ['Red', 'Green'];

  chartColors: Array<any>;

  chartOptions: any;

  constructor() { }

  ngOnInit() {
    this.chartColors = [
      {
        backgroundColor: this.backgroundColor,
        hoverBackgroundColor: this.hoverBackgroundColor,
        borderWidth: 2,
      }
    ];

    this.chartOptions = {
      responsive: true,
      maintainAspectRatio: false,
      title: {
        display: true,
        text: this.chartTitle,
        fontFamily: "quicksand-medium",
        fontSize: 16,
        fontColor: "#747d8c"
      },
      legend: {
        display: false
      },
      tooltips: {
        displayColors: false
      }
    };
  }

  chartClicked(e: any): void { }
  chartHovered(e: any): void { }
}

Please suggest as to how I can solve these 2 problems.

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Bartosz Termena staff answered 5 years ago

0 0 Best answer

Dear @anuragd7

Could you show me your card container?

To center chart, you could try to add text-align: center style to your container.

The text should remain in its position, here is my example:

<div class="container">
  <div
    class="row"
    style="height: 350px; border: 1px solid brown; justify-content: center; text-align: center"
  >
    <div style="display: block; border: 1px solid black;height: auto; width: 150px ">
      <canvas
        mdbChart
        [chartType]="chartType"
        [datasets]="chartDatasets"
        [labels]="chartLabels"
        [colors]="chartColors"
        [options]="chartOptions"
        [legend]="true"
        (chartHover)="chartHovered($event)"
        (chartClick)="chartClicked($event)"
      >
      </canvas>
    </div>
  </div>
</div>

You are right about size attribute, it doesn't seem to work as it should, we will fix that as soon as it is possible.

In my example I change the size in this line:

<div style="display: block; border: 1px solid black;height: auto; width: 200px ">

Giving different width, chart is resizing.

Hope it helps!

Best Regards, Bartosz.

anuragd7 commented 5 years ago

Thanks for your response. Unfortunately I am not able to achieve the desired result . On the first issue - I want to center the chart inside the card container vertically , by moving the chart a little lower. Adding text-align: center does not achieve this. On the second issue of trying to resize the chart - I am not able to achieve this by specifying a width in the parent container as the width is not getting applied in my case. As requested by you I am sharing the card container code in a new response below (as I cannot format it in the comment).

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anuragd7 answered 5 years ago

0 0 Best answer

The donut chart is in a separate component which is called into the parent component. I am sharing the template code for both the parent and the child component.

Parent HTML

<div class="container-fluid">
  <div class="row">
    <div class="right-col col-md-3 pr-0 pl-1" style="text-align: center;">
      <mdb-card style="height:100%">
        <app-donut-chart
        [chartData]="testStatus"
        [backgroundColor]="statusColors"
        [hoverBackgroundColor]="statusHoverColors"
        [chartTitle]="statusTitle"
        ></app-donut-chart>
      </mdb-card>
    </div>
</div>
</div>

DONUT CHART (child) HTML

<div style="display: block">
  <canvas
    mdbChart
    [chartType]="chartType"
    [datasets]="chartData"
    [labels]="chartLabels"
    [colors]="chartColors"
    [options]="chartOptions"
    [legend]="true"
    (chartHover)="chartHovered($event)"
    (chartClick)="chartClicked($event)"
    size="50"
  >
  </canvas>
</div>

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Bartosz Termena staff answered 5 years ago

0 0 Best answer

Dear @anuragd7

In this case i have to say sadly - we are limited by chartjs settings.

https://www.chartjs.org/docs

I did not find anything for separate title and chart styling.

But this is my suggestion to work around your problem:

<div class="container-fluid">
  <div class="row">
    <div style="height:500px" class="right-col col-md-3 pr-0 pl-1" #container>
      <mdb-card style="height:100%">
        <div style="position: relative; height:75%;">
          <canvas
            mdbChart
            [chartType]="chartType"
            [datasets]="chartDatasets"
            [labels]="chartLabels"
            [colors]="chartColors"
            [options]="chartOptions"
            [legend]="true"
            (chartHover)="chartHovered($event)"
            (chartClick)="chartClicked($event)"
          >
          </canvas>
        </div>
      </mdb-card>
    </div>
  </div>
</div>

TS:

@ViewChild('container', { static: true }) container: ElementRef;
  containerHeight: number;

  public chartType = 'doughnut';

  public chartDatasets: Array<any> = [{ data: [300, 50, 100, 40, 120], label: 'My First dataset' }];

  public chartLabels: Array<any> = ['Red', 'Green', 'Yellow', 'Grey', 'Dark Grey'];

  public chartColors: Array<any> = [
    {
      backgroundColor: ['#F7464A', '#46BFBD', '#FDB45C', '#949FB1', '#4D5360'],
      hoverBackgroundColor: ['#FF5A5E', '#5AD3D1', '#FFC870', '#A8B3C5', '#616774'],
      borderWidth: 2,
    },
  ];

  public chartOptions: any;
  public chartClicked(e: any): void {}
  public chartHovered(e: any): void {}

  ngOnInit() {
    this.containerHeight = this.container.nativeElement.offsetHeight / 10;

    this.chartOptions = {
      responsive: true,
      maintainAspectRatio: false,
      title: {
        display: true,
        text: 'Title',
        position: 'top',
        padding: this.containerHeight,
        fontFamily: 'quicksand-medium',
        fontSize: 16,
        fontColor: '#747d8c',
      },
      legend: {
        display: false,
      },

      tooltips: {
        displayColors: false,
      },
    };
  }

using the padding in title you can add number of pixels above and below the title text.

Hope it helps!

Best, Bartosz.

anuragd7 commented 5 years ago

Thanks @Bartosz Termena. Using your suggestions I was able to increase the size of the donut chart by setting a size for the container for the donut-chart. The padding option for the title doesn't work so well though as in chartjs the padding is applied to both the top and bottom. Thanks for your help

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Specification of the issue

User: Free
Premium support: No
Technology: MDB Angular
MDB Version: 8.1.1
Device: mac
Browser: chrome
OS: OSX
Provided sample code: No
Provided link: Yes

anuragd7

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