HeatmapLayer Class
Definition
A map layer that renders a heatmap visualization based on point data. Points with higher values show warmer colors and larger radii.
public class HeatmapLayer
Constructors
| Name | Description |
|---|---|
| HeatmapLayer | No summary available. |
HeatmapLayer Constructor
public HeatmapLayer()
Methods
| Name | Description |
|---|---|
| Bind (8 overloads) | Binds a Avalonia.AvaloniaProperty to an Avalonia.Data.BindingBase. Inherited from AvaloniaObject. |
| CheckAccess | Returns a value indicating whether the current thread is the UI thread. Inherited from AvaloniaObject. |
| ClearValue (4 overloads) | Clears a Avalonia.AvaloniaProperty's local value. Inherited from AvaloniaObject. |
| CoerceValue | Coerces the specified Avalonia.AvaloniaProperty. Inherited from AvaloniaObject. |
| Equals | Compares two objects using reference equality. Inherited from AvaloniaObject. |
| GetBaseValue | Inherited from AvaloniaObject. |
| GetHashCode | Gets the hash code for the object. Inherited from AvaloniaObject. |
| GetLayerBounds | Gets the geographic bounds (in 0-200, 0-100 viewport units) of the content in this layer. Used for auto-scaling the map to fit content. |
| GetPointData | Gets the data item at the specified screen point. |
| GetValue (3 overloads) | Gets a Avalonia.AvaloniaProperty value. Inherited from AvaloniaObject. |
| IsAnimating | Checks whether a Avalonia.AvaloniaProperty is animating. Inherited from AvaloniaObject. |
| IsSet | Checks whether a Avalonia.AvaloniaProperty is set on this object. Inherited from AvaloniaObject. |
| OnPointerExited | Handles pointer exited events. Override this method to handle interactions (e.g. clearing hover effects). |
| OnPointerMoved | Handles pointer moved events. Override this method to handle interactions (e.g. hover effects). |
| OnPointerPressed | Handles pointer pressed events. Override this method to handle interactions (e.g. selection). Inherited from MapLayer. |
| Render | Renders this layer to the drawing context. |
| SetCurrentValue (2 overloads) | Sets the value of a dependency property without changing its value source. Inherited from AvaloniaObject. |
| SetValue (3 overloads) | Sets a Avalonia.AvaloniaProperty value. Inherited from AvaloniaObject. |
| VerifyAccess | Checks that the current thread is the UI thread and throws if not. Inherited from AvaloniaObject. |
GetLayerBounds Method
Gets the geographic bounds (in 0-200, 0-100 viewport units) of the content in this layer. Used for auto-scaling the map to fit content.
public Nullable<Avalonia.Rect> GetLayerBounds()
Returns
Nullable<Avalonia.Rect>
GetPointData Method
Gets the data item at the specified screen point.
public object GetPointData(Avalonia.Point point, Avalonia.Rect chartArea)
Parameters
point Avalonia.Point
The screen point to test.
chartArea Avalonia.Rect
The chart area rectangle.
Returns
object
The data item if hit; otherwise, null.
OnPointerExited Method
Handles pointer exited events. Override this method to handle interactions (e.g. clearing hover effects).
public void OnPointerExited()
OnPointerMoved Method
Handles pointer moved events. Override this method to handle interactions (e.g. hover effects).
public bool OnPointerMoved(Avalonia.Point point, Avalonia.Rect chartArea)
Parameters
point Avalonia.Point
chartArea Avalonia.Rect
Returns
bool
True if handled.
Render Method
Renders this layer to the drawing context.
public void Render(Avalonia.Media.DrawingContext context, Avalonia.Rect chartArea, double animationProgress)
Parameters
context Avalonia.Media.DrawingContext
The drawing context.
chartArea Avalonia.Rect
The chart area rectangle.
animationProgress double
Animation progress from 0 to 1.
Properties
| Name | Description |
|---|---|
| Dispatcher | Returns the Avalonia.AvaloniaObject.Dispatcher that this Avalonia.AvaloniaObject is associated with. Inherited from AvaloniaObject. |
| HighBrush | Gets or sets the brush for high intensity values. |
| IntensityPath | Gets or sets the property path for intensity values. |
| IsVisible | Gets or sets whether this layer is visible. Inherited from MapLayer. |
| Item | Inherited from AvaloniaObject. |
| ItemsSource | Gets or sets the data source for heatmap points. |
| LatitudePath | Gets or sets the property path for latitude values. |
| LongitudePath | Gets or sets the property path for longitude values. |
| LowBrush | Gets or sets the brush for low intensity values. |
| MaxIntensity | Gets or sets the maximum intensity value for normalization. |
| MediumBrush | Gets or sets the brush for medium intensity values. |
| Opacity | Gets or sets the opacity of this layer. Inherited from MapLayer. |
| Radius | Gets or sets the base radius for heatmap points (in pixels). |
| TooltipTemplate | Gets or sets the data template used for tooltips. Inherited from MapLayer. |
HighBrush Property
Gets or sets the brush for high intensity values.
public Avalonia.Media.IBrush HighBrush { get; set; }
IntensityPath Property
Gets or sets the property path for intensity values.
public string IntensityPath { get; set; }
ItemsSource Property
Gets or sets the data source for heatmap points.
public System.Collections.IEnumerable ItemsSource { get; set; }
LatitudePath Property
Gets or sets the property path for latitude values.
public string LatitudePath { get; set; }
LongitudePath Property
Gets or sets the property path for longitude values.
public string LongitudePath { get; set; }
LowBrush Property
Gets or sets the brush for low intensity values.
public Avalonia.Media.IBrush LowBrush { get; set; }
MaxIntensity Property
Gets or sets the maximum intensity value for normalization.
public double MaxIntensity { get; set; }
MediumBrush Property
Gets or sets the brush for medium intensity values.
public Avalonia.Media.IBrush MediumBrush { get; set; }
Radius Property
Gets or sets the base radius for heatmap points (in pixels).
public double Radius { get; set; }
Fields
HighBrushProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.HighBrush Avalonia property.
public Avalonia.StyledProperty<Avalonia.Media.IBrush> HighBrushProperty
IntensityPathProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.IntensityPath Avalonia property.
public Avalonia.StyledProperty<string> IntensityPathProperty
ItemsSourceProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.ItemsSource Avalonia property.
public Avalonia.StyledProperty<System.Collections.IEnumerable> ItemsSourceProperty
LatitudePathProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.LatitudePath Avalonia property.
public Avalonia.StyledProperty<string> LatitudePathProperty
LongitudePathProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.LongitudePath Avalonia property.
public Avalonia.StyledProperty<string> LongitudePathProperty
LowBrushProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.LowBrush Avalonia property.
public Avalonia.StyledProperty<Avalonia.Media.IBrush> LowBrushProperty
MaxIntensityProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.MaxIntensity Avalonia property.
public Avalonia.StyledProperty<double> MaxIntensityProperty
MediumBrushProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.MediumBrush Avalonia property.
public Avalonia.StyledProperty<Avalonia.Media.IBrush> MediumBrushProperty
RadiusProperty Field
Identifies the Avalonia.Controls.Charts.HeatmapLayer.Radius Avalonia property.
public Avalonia.StyledProperty<double> RadiusProperty
Events
| Name | Description |
|---|---|
| Invalidated | Event raised when the layer needs to be redrawn. Inherited from MapLayer. |
| PropertyChanged | Raised when a Avalonia.AvaloniaProperty value changes on this object. Inherited from AvaloniaObject. |