Speedometer chart

[amityweb]

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.

[Shashi Ranjan]

@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.

—
Shashi Ranjan
Team CanvasJS

[CARLOS SOUSA]

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

[sandeep]

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