Ranges in Xamarin.Android SfCircularGauge
19 Oct 202019 minutes to read
Range is a visual element, which begins and ends at specified values within a scale.
Setting start and end values for range
Start and end values of ranges are set by using the StartValue and EndValue properties.
SfCircularGauge circularGauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
CircularRange range = new CircularRange();
range.StartValue = 0;
range.EndValue = 50;
scale.CircularRanges.Add(range);
circularGauge.CircularScales.Add(scale);
Range customization
An UI of a range is customized by using the Color and Width properties. First, you should set the Offset property for range, then increase the width of the range.
SfCircularGauge circularGauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
scale.RimWidth = 10;
scale.RimColor = Color.ParseColor("#E0E0E0");
scale.LabelColor = Color.ParseColor("#424242");
scale.MajorTickSettings.Width = 3;
scale.LabelOffset = 0.9;
scale.MinorTickSettings.Size = 5;
scale.MajorTickSettings.Size = 10;
scale.MajorTickSettings.Offset = 0.8;
scale.MinorTickSettings.Offset = 0.8;
scale.MinorTicksPerInterval = 3;
CircularRange range = new CircularRange();
range.StartValue = 0;
range.EndValue = 50;
range.Width = 70;
range.Offset = 0.8;
range.Color = Color.Pink;
scale.CircularRanges.Add(range);
circularGauge.CircularScales.Add(scale);
Setting position for range
The range can be placed inside the scale, outside the scale, or on the scale by using the following two ways:
1.The Offset property with the Width property.
SfCircularGauge circularGauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
CircularRange range = new CircularRange();
range.StartValue = 0;
range.EndValue = 100;
range.Offset = 0.5;
range.Width = 20;
scale.CircularRanges.Add(range);
circularGauge.CircularScales.Add(scale);
2.The InnerStartOffset, InnerEndOffset, OuterStartOffset, and OuterEndOffset properties.
SfCircularGauge circularGauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
CircularRange range = new CircularRange();
range.StartValue = 10;
range.EndValue = 80;
range.InnerStartOffset = 0.83;
range.InnerEndOffset = 0.6;
range.OuterStartOffset = 0.85;
range.OuterEndOffset = 0.8;
scale.CircularRanges.Add(range);
circularGauge.CircularScales.Add(scale);
Setting multiple ranges
In addition to the default range, you can add n number of ranges to a scale by using the CircularRanges property.
SfCircularGauge gauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
scale.StartAngle = 180;
scale.SweepAngle = 180;
scale.Interval = 10;
scale.ShowLabels = false;
scale.ShowTicks = false;
scale.ShowRim = false;
scale.RimWidth = 40;
scale.RadiusFactor = 0.9;
scale.RimColor = Color.ParseColor("#e0e0e0");
Header header1 = new Header();
header1.Text = "Poor";
header1.TextSize = 20;
header1.Position = new PointF((float)0.1, (float)0.55);
header1.TextColor = Color.ParseColor("#F03E3E");
header1.TextStyle = Typeface.Create("Helvetica", TypefaceStyle.Bold);
gauge.Headers.Add(header1);
Header header2 = new Header();
header2.Text = "Good";
header2.TextSize = 20;
header2.Position = new PointF((float)0.87, (float)0.55);
header2.TextColor = Color.ParseColor("#27beb7");
header2.TextStyle = Typeface.Create("Helvetica", TypefaceStyle.Bold);
gauge.Headers.Add(header2);
//Poor
CircularRange range = new CircularRange();
range.StartValue = 0;
range.EndValue = 35;
range.Offset = 0.9;
range.Width = 40;
range.Color = Color.ParseColor("#F03E3E");
scale.CircularRanges.Add(range);
//Average
CircularRange range1 = new CircularRange();
range1.StartValue = 35;
range1.EndValue = 75;
range1.Offset = 0.9;
range1.Width = 40;
range1.Color = Color.ParseColor("#FFDD00");
scale.CircularRanges.Add(range1);
//Good
CircularRange range2 = new CircularRange();
range2.StartValue = 75;
range2.EndValue = 100;
range2.Offset = 0.9;
range2.Width = 40;
range2.Color = Color.ParseColor("#27beb7");
scale.CircularRanges.Add(range2);
NeedlePointer pointer = new NeedlePointer();
pointer.Width = 10;
pointer.LengthFactor = 0.66;
pointer.Color = Color.OrangeRed;
pointer.KnobColor = Color.White;
pointer.Type = Com.Syncfusion.Gauges.SfCircularGauge.Enums.NeedleType.Triangle;
pointer.KnobRadius = 0;
pointer.Value = 70;
pointer.KnobStrokeColor = Color.ParseColor("#0682F6");
pointer.KnobStrokeWidth = 6;
scale.CircularPointers.Add(pointer);
scales.Add(scale);
gauge.CircularScales = scales;
Setting gradient color for range
You can give smooth color transition to range by specifying the different colors based on range value.
SfCircularGauge gauge = new SfCircularGauge(this);
ObservableCollection<CircularScale> scales = new ObservableCollection<CircularScale>();
CircularScale scale = new CircularScale();
scale.StartValue = 0;
scale.EndValue = 100;
scale.Interval = 10;
scale.LabelTextSize = 16;
scale.LabelOffset = 0.95;
scale.RimWidth = 28;
scale.ShowRim = false;
scale.MinorTicksPerInterval = 4;
TickSetting major = new TickSetting();
major.Width = 1;
major.EndOffset = 0.83;
major.StartOffset = 0.75;
major.Size = 8;
scale.MajorTickSettings = major;
TickSetting minor = new TickSetting();
minor.Width = 0.7;
minor.EndOffset = 0.79;
minor.StartOffset = 0.75;
scale.MinorTickSettings = minor;
scales.Add(scale);
gauge.CircularScales = scales;
CircularRange range = new CircularRange();
range.Offset = 0.6;
range.Width = 30;
range.StartValue = 0;
range.EndValue = 100;
scale.CircularRanges.Add(range);
ObservableCollection<GaugeGradientStop> gradientColor1 = new ObservableCollection<GaugeGradientStop>();
GaugeGradientStop gaugeGradientStop = new GaugeGradientStop();
gaugeGradientStop.Value = 0;
gaugeGradientStop.Color = Color.ParseColor("#30B32D");
gradientColor1.Add(gaugeGradientStop);
GaugeGradientStop gaugeGradientStop1 = new GaugeGradientStop();
gaugeGradientStop1.Value = 50;
gaugeGradientStop1.Color = Color.ParseColor("#FFDD00");
gradientColor1.Add(gaugeGradientStop1);
GaugeGradientStop gaugeGradientStop2 = new GaugeGradientStop();
gaugeGradientStop2.Value = 80;
gaugeGradientStop2.Color = Color.ParseColor("#F03E3E");
gradientColor1.Add(gaugeGradientStop2);
range.GradientStops = gradientColor1;
gauge.CircularScales = scales;
See also
How to add multiple range gradient brushes to SfCircularGauge