Implementing Radial Gauge

The Syncfusion WinUI Radial Gauge (SfRadialGauge) is a multi-purpose data visualization control that displays numerical values on a circular scale. It's ideal for creating speedometers, temperature monitors, dashboard gauges, meter gauges, multi-axis clocks, watches, activity gauges, compasses, and other circular indicators.

When to Use This Skill

Use this skill when you need to:

• Display metrics circularly - Speedometers, tachometers, fuel gauges, pressure meters
• Create dashboard indicators - KPI gauges, performance monitors, progress indicators
• Build measurement displays - Temperature monitors, humidity gauges, voltage meters
• Implement activity trackers - Fitness rings, progress circles, goal trackers
• Design custom dials - Compass displays, clock faces, directional indicators
• Show ranges visually - Color-coded zones (red/yellow/green), danger/warning/safe areas
• Animate value changes - Smooth transitions with pointer animations
• Enable user interaction - Draggable pointers for value adjustment
• Display multiple metrics - Multi-axis gauges showing related data points

Component Overview

Key Features:

• Circular axis with customizable scale, labels, ticks, and styling
• Four pointer types - Needle, Shape, Content, and Range pointers
• Visual ranges - Color-coded segments with gradient support
• Annotations - Add text, images, or custom UI elements
• Animations - Smooth pointer movements with easing functions
• Interactive dragging - User-adjustable pointer values
• Multiple axes - Display multiple scales in one gauge
• Flexible styling - Pixel or factor-based sizing for responsive layouts

Documentation and Navigation Guide

Getting Started

📄 Read: references/getting-started.md

Use when you need to:

• Install and set up Syncfusion WinUI Radial Gauge
• Create your first radial gauge
• Add basic axis, ranges, pointers, and annotations
• Understand the component structure
• Get a complete working example

Axis Configuration

📄 Read: references/axis-configuration.md

Use when you need to:

• Configure axis minimum, maximum, and interval
• Customize start and end angles (180°, 270°, 360°, etc.)
• Adjust axis radius and positioning
• Style axis line (width, color, gradients)
• Customize labels (format, template, rotation, position)
• Configure ticks (major/minor, length, style, position)
• Show/hide axis elements
• Implement multiple axes
• Create custom scale ranges
• Handle axis events

Pointers

📄 Read: references/pointers.md

Use when you need to:

• Add needle pointers with knobs and tails
• Use shape pointers (circle, diamond, triangle, etc.)
• Create content pointers with custom UI
• Implement range pointers for arc segments
• Add multiple pointers to one axis
• Enable interactive pointer dragging
• Animate pointer movements
• Handle pointer value change events
• Customize pointer appearance and offset

Ranges

📄 Read: references/ranges.md

Use when you need to:

• Create color-coded value ranges
• Define start and end values for ranges
• Customize range width (equal or tapered)
• Apply gradients to ranges
• Position ranges (offset from axis)
• Add labels to ranges
• Use range colors for axis elements
• Create template-based range labels

Annotations

📄 Read: references/annotations.md

Use when you need to:

• Add text labels at specific positions
• Display images on the gauge
• Position annotations using angles or axis values
• Adjust annotation distance from center
• Align annotations (horizontal/vertical)
• Add custom UI elements as annotations

Animation

📄 Read: references/animation.md

Use when you need to:

• Enable pointer animations
• Control animation duration
• Apply easing functions (linear, bounce, elastic, etc.)
• Create smooth value transitions

API Reference

📄 Read: references/api-reference.md

Use when you need to:

• Look up specific properties
• Understand class hierarchies
• Find available customization options
• Reference complete API documentation

Quick Start Example

Here's a basic speedometer gauge with ranges and needle pointer:

<Window x:Class="RadialGaugeApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:gauge="using:Syncfusion.UI.Xaml.Gauges">
    
    <gauge:SfRadialGauge>
        <gauge:SfRadialGauge.Axes>
            <gauge:RadialAxis Maximum="150"
                              Interval="10">
                
                <!-- Color-coded ranges -->
                <gauge:RadialAxis.Ranges>
                    <gauge:GaugeRange StartValue="0"
                                      EndValue="50"
                                      Background="Green" />
                    <gauge:GaugeRange StartValue="50"
                                      EndValue="100"
                                      Background="Orange" />
                    <gauge:GaugeRange StartValue="100"
                                      EndValue="150"
                                      Background="Red" />
                </gauge:RadialAxis.Ranges>
                
                <!-- Needle pointer -->
                <gauge:RadialAxis.Pointers>
                    <gauge:NeedlePointer Value="90"
                                         EnableAnimation="True" />
                </gauge:RadialAxis.Pointers>
                
                <!-- Value annotation -->
                <gauge:RadialAxis.Annotations>
                    <gauge:GaugeAnnotation DirectionUnit="Angle"
                                           DirectionValue="90"
                                           PositionFactor="0.5">
                        <gauge:GaugeAnnotation.Content>
                            <TextBlock Text="90"
                                       FontSize="25"
                                       FontWeight="Bold" />
                        </gauge:GaugeAnnotation.Content>
                    </gauge:GaugeAnnotation>
                </gauge:RadialAxis.Annotations>
                
            </gauge:RadialAxis>
        </gauge:SfRadialGauge.Axes>
    </gauge:SfRadialGauge>
    
</Window>

using Syncfusion.UI.Xaml.Gauges;
using Microsoft.UI.Xaml;

namespace RadialGaugeApp
{
    public sealed partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
            
            // Can also create gauge programmatically
            SfRadialGauge gauge = new SfRadialGauge();
            
            RadialAxis axis = new RadialAxis();
            axis.Maximum = 150;
            axis.Interval = 10;
            
            // Add ranges
            axis.Ranges.Add(new GaugeRange { 
                StartValue = 0, 
                EndValue = 50, 
                Background = new SolidColorBrush(Colors.Green) 
            });
            
            // Add pointer
            axis.Pointers.Add(new NeedlePointer { 
                Value = 90, 
                EnableAnimation = true 
            });
            
            gauge.Axes.Add(axis);
        }
    }
}

Common Patterns

Pattern 1: Temperature Monitor

<gauge:SfRadialGauge>
    <gauge:SfRadialGauge.Axes>
        <gauge:RadialAxis Minimum="-60"
                          Maximum="60"
                          Interval="20"
                          StartAngle="180"
                          EndAngle="0">
            
            <gauge:RadialAxis.Ranges>
                <gauge:GaugeRange StartValue="-60"
                                  EndValue="0"
                                  Background="#2196F3" />
                <gauge:GaugeRange StartValue="0"
                                  EndValue="30"
                                  Background="#4CAF50" />
                <gauge:GaugeRange StartValue="30"
                                  EndValue="60"
                                  Background="#FF5722" />
            </gauge:RadialAxis.Ranges>
            
            <gauge:RadialAxis.Pointers>
                <gauge:RangePointer Value="25"
                                    PointerWidth="15"
                                    EnableAnimation="True" />
            </gauge:RadialAxis.Pointers>
            
            <gauge:RadialAxis.Annotations>
                <gauge:GaugeAnnotation>
                    <gauge:GaugeAnnotation.Content>
                        <TextBlock Text="25°C"
                                   FontSize="30"
                                   FontWeight="Bold" />
                    </gauge:GaugeAnnotation.Content>
                </gauge:GaugeAnnotation>
            </gauge:RadialAxis.Annotations>
            
        </gauge:RadialAxis>
    </gauge:SfRadialGauge.Axes>
</gauge:SfRadialGauge>

Pattern 2: Interactive Draggable Gauge

<gauge:SfRadialGauge>
    <gauge:SfRadialGauge.Axes>
        <gauge:RadialAxis ShowTicks="False"
                          AxisLineFill="CornflowerBlue"
                          AxisLineWidth="30">
            
            <gauge:RadialAxis.Pointers>
                <gauge:ShapePointer Value="60"
                                    IsInteractive="True"
                                    MarkerOffset="-30"
                                    Background="Indigo"
                                    ValueChanged="Pointer_ValueChanged" />
            </gauge:RadialAxis.Pointers>
            
        </gauge:RadialAxis>
    </gauge:SfRadialGauge.Axes>
</gauge:SfRadialGauge>

private void Pointer_ValueChanged(object sender, ValueChangedEventArgs e)
{
    // Handle pointer value changes
    Debug.WriteLine($"New value: {e.Value}");
}

Pattern 3: Multi-Axis Clock

<gauge:SfRadialGauge>
    <gauge:SfRadialGauge.Axes>
        <!-- Hours axis -->
        <gauge:RadialAxis Maximum="12"
                          Interval="1"
                          RadiusFactor="0.8"
                          LabelPosition="Outside">
            <gauge:RadialAxis.Pointers>
                <gauge:NeedlePointer Value="10"
                                     NeedleLength="0.5"
                                     NeedleEndWidth="8" />
            </gauge:RadialAxis.Pointers>
        </gauge:RadialAxis>
        
        <!-- Minutes axis -->
        <gauge:RadialAxis Maximum="60"
                          Interval="5"
                          RadiusFactor="0.95"
                          LabelPosition="Outside">
            <gauge:RadialAxis.Pointers>
                <gauge:NeedlePointer Value="35"
                                     NeedleLength="0.7"
                                     NeedleEndWidth="4" />
            </gauge:RadialAxis.Pointers>
        </gauge:RadialAxis>
    </gauge:SfRadialGauge.Axes>
</gauge:SfRadialGauge>

Pattern 4: Progress Ring with Percentage

<gauge:SfRadialGauge>
    <gauge:SfRadialGauge.Axes>
        <gauge:RadialAxis ShowLabels="False"
                          ShowTicks="False"
                          StartAngle="270"
                          EndAngle="270"
                          Maximum="100"
                          AxisLineWidth="20"
                          AxisLineFill="LightGray">
            
            <gauge:RadialAxis.Pointers>
                <gauge:RangePointer Value="73"
                                    PointerWidth="20"
                                    Background="#4CAF50"
                                    CornerStyle="BothCurve"
                                    EnableAnimation="True" />
            </gauge:RadialAxis.Pointers>
            
            <gauge:RadialAxis.Annotations>
                <gauge:GaugeAnnotation>
                    <gauge:GaugeAnnotation.Content>
                        <TextBlock>
                            <Run Text="73" FontSize="40" FontWeight="Bold" />
                            <Run Text="%" FontSize="20" />
                        </TextBlock>
                    </gauge:GaugeAnnotation.Content>
                </gauge:GaugeAnnotation>
            </gauge:RadialAxis.Annotations>
            
        </gauge:RadialAxis>
    </gauge:SfRadialGauge.Axes>
</gauge:SfRadialGauge>

Key Properties by Category

SfRadialGauge

• Axes - Collection of RadialAxis objects
• CanScaleToFit - Position axis based on start/end angles

Axis Configuration

• Minimum / Maximum - Axis value range
• Interval - Space between labels
• StartAngle / EndAngle - Circular arc angles (0-360°)
• RadiusFactor - Axis size (0-1 factor of available space)
• IsInversed - Counter-clockwise direction

Axis Styling

• AxisLineWidth / AxisLineWidthUnit - Line thickness (Pixel/Factor)
• AxisLineFill - Line color/brush
• GradientStops - Gradient colors on axis line
• ShowAxisLine - Axis line visibility

Labels & Ticks

• ShowLabels / ShowTicks - Element visibility
• LabelFormat - Number format (currency, percent, etc.)
• LabelTemplate - Custom label template
• LabelPosition / TickPosition - Inside/Outside/Cross
• LabelOffset / TickOffset - Distance from axis
• MajorTickLength / MinorTickLength - Tick sizes
• MinorTicksPerInterval - Minor tick count

Pointers (All Types)

• Value - Current pointer value
• EnableAnimation - Animate on value change
• AnimationDuration - Animation time (ms)
• AnimationEasingFunction - Easing function
• IsInteractive - Enable dragging

Needle Pointer Specific

• NeedleLength / NeedleStartWidth / NeedleEndWidth - Needle shape
• KnobRadius / KnobFill / KnobStroke - Center knob
• TailLength / TailWidth - Needle tail

Shape Pointer Specific

• ShapeType - Circle, Diamond, Triangle, etc.
• ShapeHeight / ShapeWidth - Shape size
• MarkerOffset - Distance from axis

Range Pointer Specific

• PointerWidth - Arc width
• CornerStyle - BothFlat, BothCurve, StartCurve, EndCurve

Ranges

• StartValue / EndValue - Range boundaries
• StartWidth / EndWidth - Range thickness
• WidthUnit - Pixel or Factor
• RangeOffset - Distance from axis
• Background - Range color
• GradientStops - Gradient colors
• Label / LabelTemplate - Range label

Annotations

• DirectionUnit - Angle or AxisValue
• DirectionValue - Position value
• PositionFactor - Distance from center (0-1)
• Content - Any UIElement

Common Use Cases

1. Speedometer/Tachometer - Vehicle speed/RPM display with color-coded danger zones
2. Temperature Gauge - Climate monitors with cold/moderate/hot ranges
3. Pressure Meter - Tire pressure, hydraulic pressure with threshold indicators
4. Battery Level - Circular battery indicator with percentage annotation
5. Fitness Tracker - Activity rings showing steps, calories, distance
6. KPI Dashboard - Business metrics with goal thresholds
7. Volume Control - Draggable circular volume adjuster
8. Compass - Directional gauge with degree markings
9. Timer/Stopwatch - Elapsed time visualization
10. Progress Indicator - Task completion, download progress
11. Rating Display - Score visualization (1-10 scale)
12. Multi-Metric Display - Multiple axes showing related measurements

Notes

• All size properties support Pixel or Factor units for responsive layouts
• Factor values (0-1) are multiplied by axis radius for proportional sizing
• Use animations for smooth transitions when updating values
• Enable IsInteractive for user-adjustable pointers with drag support
• Multiple axes can share the same center with different radius factors
• GradientStops provide smooth color transitions based on axis values
• Annotations can contain any WinUI UIElement (TextBlock, Image, Grid, etc.)

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Installation: Install the Syncfusion.Gauge.WinUI NuGet package

Namespace: Syncfusion.UI.Xaml.Gauges

GitHub Samples: WinUI Radial Gauge Demos