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Pointers in ASP.NET Core Circular Gauge control

Pointers are used to indicate values on the axis. Value of the pointer can be modified using the value property.

tagHelper
pointers.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Gauge supports 3 types of pointers such as Needle, RangeBar and Marker. You can choose any one of the pointer by using type property.

Needle Pointers

A needle pointer contains three parts, a needle, a cap / knob and a tail. The length of the needle can be customized by using radius property. The length of the tail can be customized by using length property. The radius of the cap can be customized by using radius in cap object. The needle and tail length takes value either in percentage or pixel.

tagHelper
needle-pointers.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            radius: '50%',
            cap: {
                radius: 10
            },
            needleTail: {
                length: '25%'
            }
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Customization

Needle color and width can be customized by using color and pointerWidth property. Cap and tails can be customized by using cap and needleTail object.

tagHelper
customization.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            radius: '50%',
            cap: {
                radius: 15,
                color: 'white',
                border: {
                    color: '#007DD1',
                    width: 5
                }
            },
            needleTail: {
                length: '22%',
                color: '#007DD1'
            },
            color: '#007DD1',
            pointerWidth: 25
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

RangeBar Pointer

RangeBar pointer is like ranges in an axis, that can be placed on gauge to mark the pointer value. RangeBar starts from the beginning of the gauge and ends at the pointer value.

tagHelper
rangebar-pointer.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 50,
            type: 'RangeBar',
            radius: '60%'
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Customization

RangeBar can be customized in terms of color, border and thickness by using color, border and pointerWidth property.

tagHelper
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 50,
            type: 'RangeBar',
            radius: '60%',
            color: '#007DD1',
            border: {
                color: 'grey',
                width: 2
            },
            pointerWidth: 15
        }]
    }
</script>

Rounded corner for range bar pointer

The start and end pointers of range bar in the circular gauge are rounded to form arc gauges.

tagHelper
rangebar-pointer.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 50,
            type: 'RangeBar',
            roundedCornerRadius: 6,
            radius: '60%'
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Marker Pointer

Different type of marker shape can be used to mark the pointer value in axis. You can change the marker shape using markerShape property in pointer. Gauge supports the below marker shape.

  • Circle
  • Rectangle
  • Triangle
  • InvertedTriangle
  • Diamond

We can use image instead of rendering marker shape to denote the pointer value. It can be achieved by setting markerShape to Image and assigning  image path to imageUrl in pointer.

tagHelper
marker-pointer.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            type: 'Marker',
            markerShape: 'InvertedTriangle',
            radius: '100%',
            markerHeight: 15,
            markerWidth: 15
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Customization

The marker can be customized in terms of color, border, width and height by using color, border, markerWidth and markerHeight property in pointer.

tagHelper
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            type: 'Marker',
            markerShape: 'Triangle',
            radius: '100%',
            color: 'white',
            border: {
                color: '#007DD1',
                width: 2
            },
            markerHeight: 15,
            markerWidth: 15
        }]
    }
</script>

Multiple Pointers

In addition to the default pointer, you can add n number of pointer to an axis by using pointers property.

tagHelper
multiple-pointer.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            type: 'Marker',
            markerShape: 'InvertedTriangle',
            radius: '100%',
            markerHeight: 15,
            markerWidth: 15
        }, {
            value: 90,
            type: 'RangeBar',
            radius: '60%',
            pointerWidth: 10
        }, {
            value: 90,
            radius: '60%',
            cap: {
                radius: 15,
                border: {
                    width: 5
                }
            },
            needleTail: {
                length: '22%',
            },
            pointerWidth: 25
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Animation

Pointer will get animate on loading the gauge, this can be handled by using animation property in pointer. The enable property in animation allows you to enable or disable the animation. The duration property specify the duration of the animation in milliseconds.

tagHelper
animation.cs
@using Syncfusion.EJ2;
<ejs-circulargauge id="circular" load="gaugeload"></ejs-circulargauge>
<script>
    window.gaugeload = function (args) {
        var axis = args.gauge.axes[0];
        axis.pointers = [{
            value: 90,
            type: 'Marker',
            markerShape: 'InvertedTriangle',
            radius: '100%',
            markerHeight: 15,
            markerWidth: 15
        }, {
            value: 90,
            type: 'RangeBar',
            radius: '60%',
            pointerWidth: 10
        }, {
            value: 90,
            radius: '60%',
            cap: {
                radius: 15,
                border: {
                    width: 5
                }
            },
            needleTail: {
                length: '22%',
            },
            pointerWidth: 25
        }]
    }
</script>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}
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