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Speedometer chart

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  • #24210

    Hi.

    Can canvas is do speedometers? Customer has asked to change it to speedeometer for a graph of marks out of 10.
    Thanks

    • This topic was modified 2 years, 7 months ago by amityweb.
    #24220

    @amityweb,

    Sorry, we don’t have a gauge chart as of now but a semi doughnut chart can be used to create it. Please below the steps below for creating a gauge chart using a doughnut chart.

    First, we need to create an object that will store all the necessary data that is needed to be shown on the gauge chart. The code snippet below shows an example of that object:

    var gauge = {
      title:{text: "Gauge Chart"},
      data: { y: 7 }, //gauge value 
      maximum: 10
    };

    In the second step, we will initialize the chart object and populate its dataPoints considering the fact that only half of the doughnut chart be displayed. Please refer to the code snippet below for achieving the same:

    var chart = new CanvasJS.Chart("chartContainer");
    createGauge(chart);
    
    //Function for gauge
    function createGauge(chart){
      //Caluculation of remaining parameters to render gauge with the help of doughnut
      gauge.unoccupied = {
        y: gauge.maximum - gauge.data.y , 
        color: "#DEDEDE", 
        toolTipContent: null, 
        highlightEnabled: false,
        click : function (){ gauge.unoccupied.exploded = true; }
      }
      gauge.data.click = function (){ gauge.data.exploded = true; };
      if(!gauge.data.color)
        gauge.data.color = "#69C434";
      gauge.valueText = {text: gauge.data.y.toString(), verticalAlign :"center"};
    
      var data = {
        type: "doughnut",
        dataPoints: [
          {
            y: gauge.maximum ,
            color: "transparent",
            toolTipContent: null
          },
          gauge.data,
          gauge.unoccupied
        ],
      };
    
      if(!chart.options.data)
        chart.options.data = [];
      chart.options.data.push(data);
    
      if(gauge.title){
        chart.options.title = gauge.title;
      }
    
      //For showing value
      if(!chart.options.subtitles)
        chart.options.subtitles = [];
      chart.options.subtitles.push(gauge.valueText);
    
      chart.render();
    }

    You can also refer to take a look at this JSFiddle for a working example with sample code.

    Gauge Chart


    Shashi Ranjan
    Team CanvasJS

    #27390

    We create an speedometer with the following link suggestion that use CanjasJS.
    https://codepen.io/PowerTower/pen/GQONjy

    Whats we did:
    1) We Created diferentes areas but the color is the same “white”, once is our background-color:
    data: [
    {
    type: ‘doughnut’,
    dataPoints: [
    {
    y: 1,
    color: ‘white’
    },
    {
    y: 1,
    color: ‘white’
    }
    ,
    {
    y: 1,
    color: ‘white’
    }
    ]
    Basicaly we use de structure of diferentes color for separate areas, However all color we use “white” that is ou background-color. So the color is never shown.

    2) We removed the center informaton number.

    3) We adjusted the pointer position and size.

    4) We add a background-img in at the div

    If you want to see the result, check the link: https://silossoft.com.br/canvasjs-gauge-speedometer.jpg

    I hope this could help someone else

    #27432

    Hi Carlos,

    That’s nice work. It will definitely help many others.

    Thanks for taking the efforts and posting in this community forum.


    Sandeep
    Team CanvasJS

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