Ranges and Frames

Ranges are used to specify or group the scale values. By using ranges, you can describe the values in the pointers.

Adding Range Collection

Range collection is directly added to the scale object. Refer the following code example to add range collection in a Gauge control.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • /// <reference path="tsfiles/jquery.d.ts" />
    /// <reference path="tsfiles/ej.web.all.d.ts" />
    
    module CircularGaugeComponent {
    
     $(function () {
            //For circular gauge rendering
                var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                scales: [{
                    showRanges: true,
                    ranges: [{
                        startValue: 20,
                        endValue: 80
                    }]
                }]
            })
        });
    }

    Range Customization

    Appearance

    The API size is used to specify the width of the ranges. The major attributes for ranges are startValue and endValue. startValue defines the start position of the ranges and endValue defines the end position of the ranges.

    startWidth and endWidth are used to specify the range width at the starting and ending position of the ranges. You can add the gradient effects and opacity to the ranges by using gradients object and opacity property.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • $(function () {
            // For Circular Gauge rendering
               var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                scales: [{
                    showRanges: true,
                    showScaleBar: true,
                    radius: 150, size: 2,
                    ranges: [{
                        //For setting range start value
                        startValue: 20,
                        //For setting range end value
                        endValue: 80,
                        //For setting range background color
                        backgroundColor: "Green",
                        //For setting range opacity
                        opacity: 1
                    }]
                }]
            });
        });

    Execute the above code to render the following output.

    Colors and Border

    By customizing the ranges, the appearance of the Gauge can be improved. The range border is modified with the object called border. It has two border property such as color and width`. These are used to customize the border color of the ranges and border width of the ranges.

    You can set the background color to improve the look and feel of the Circular Gauge. For customizing the background color of the ranges, `backgroundColor is used.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • $(function () {
            // For Circular Gauge rendering
                var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                scales: [{
                    showRanges: true,
                    showScaleBar: true,
                    radius: 150, size: 2,
                    ranges: [{
                        //For setting range start value
                        startValue: 20,
                        //For setting range end value
                        endValue: 80,
                        //For setting range background color
                        backgroundColor: "yellow",
                        //For setting range border
                        border: { color: "green", width: 2 },
                    }]
                }]
            });
        });

    Execute the above code to render the following output.

    Positioning the ranges

    You can position ranges using two properties such as distanceFromScale and placement. distanceFromScale property defines the distance between the scale and range. Placement property is used to locate the pointer with respect to scale either inside the scale or outside the scale or along the scale. It is an enumerable data type.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • $(function () {
            // For Circular Gauge rendering
                var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                scales: [{
                    showRanges: true,
                    showScaleBar: true,
                    radius: 150, size: 2,
                    ranges: [{
                        //For setting range start value
                        startValue: 0,
                        //For setting range end value
                        endValue: 100,
                        //For setting range background color
                        backgroundColor: "Green",
                        //For setting range placement
                        placement: "far",
                        //For setting distance between scale and ranges
                        distanceFromScale: -30,
                        //For setting range border
                        border: { color: "Black", width: 2 },
                    }]
                }]
            });
        });

    Execute the above code to render the following output.

    Multiple Ranges

    You can set multiple ranges by adding an array of ranges objects. Refer the following code example for multiple ranges functionality.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • $(function () {
            // For Circular Gauge rendering
                var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                scales: [{
                    showRanges: true,
                    showScaleBar: true,
                    radius: 150, size: 2,
                    pointers: [{
                        value: 40,
                        showBackNeedle: true,
                        length: 100
                    }],
                    ranges: [
                    //For setting range1
                    {
                        startValue: 0, endValue: 50,
                        backgroundColor: "Green",
                        placement: "far", distanceFromScale: -30
                    },
                    //For setting range2
                    {
                        startValue: 50, endValue: 80,
                        backgroundColor: "yellow",
                        placement: "far", distanceFromScale: -30
                    },
                    //For setting range3
                    {
                        startValue: 80, endValue: 100,
                        backgroundColor: "red",
                        placement: "far", distanceFromScale: -30
                    }]
                }]
            });
        });

    Execute the above code to render the following output.

    Frames

    Frame is the element that decides the appearance of the Circular Gauge. You can customize it using the object called frame. It has the properties such as frameType, backGroundUrl, halfCircleFrameStartAngle and halfCircleFrameEndAngle.

    frameType is used to specify whether frame is a half circle frame or full circle frame. halfCircleFrameStartAngle and halfCircleFrameEndAngle are used to specify the angle for Gauge with frame type as half circle. backgroundUrl is used to set the background image for the frame.

  • html
  • <div id="CircularGauge1"></div>
  • javascript
  • $(function () {
            // For Circular Gauge rendering
                var circularGaugeSample = new ej.datavisualization.CircularGauge($("#CircularGauge1"),{
                frame: {
                    //For setting type
                    frameType: "halfcircle",
                    //For setting half circle frame start angle
                    halfCircleFrameStartAngle: 205,
                    //For setting half circle frame end angle
                    halfCircleFrameEndAngle: 335,
                }, pointerCap: { radius: 50 },
                backgroundColor: "#FFCCCC",
                scales: [{
                    startAngle: 180, sweepAngle: 180,
                    pointers: [{
                        needleType: "rectangle",
                        width: 1, length: 120, value: 40
                    }]
                }]
            });
        });

    Execute the above code to render the following output.