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GeoTiffRasterLayer

Namespace: ThinkGeo.Core

This class represents a TIFF image to be drawn on the map.

public class GeoTiffRasterLayer : RasterLayer

Inheritance ObjectLayerBaseLayerRasterLayerGeoTiffRasterLayer

Remarks:

The TiffRasterLayer represents a TIFF file for drawing on the map. Simply provide the path and filename for the TIFF file, add the layer to the MapEngine class and start drawing. You can also draw the layer manually outside of the MapEngine.

Properties

ImagePathFilename

Gets or sets the image path filename.

public string ImagePathFilename { get; set; }

Property Value

String

        The image path filename.

HasBoundingBox

This property checks to see if a Layer has a BoundingBox or not. If it has no BoundingBox, it will throw an exception when you call the GetBoundingBox() and GetFullExtent() APIs. In GeoTiffRasterLayer, we override this API and mark it as true.

public bool HasBoundingBox { get; }

Property Value

Boolean

Remarks:

The default implementation in the base class returns false.

DrawingQuality

Gets or sets the drawing quality.

public DrawingQuality DrawingQuality { get; set; }

Property Value

DrawingQuality

        The drawing quality.

ImageSource

This property gets and sets the Image used by the RasterLayer.

public RasterSource ImageSource { get; protected set; }

Property Value

RasterSource
This property gets the Image used by the RasterLayer.

Remarks:

The set for this property is protected and only intended to be used by developers who are creating their own ImageSources. This is the main property to set for developers who are creating their own RasterLayer derivatives.

UpperThreshold

This property gets and sets the upper threshold in the scale at which to display the image.

public double UpperThreshold { get; set; }

Property Value

Double
This property gets the upper threshold in the scale at which to display the image.

Remarks:

Above the upper threshold in scale, the image will not be displayed. This, in conjunction with the LowerThreshold property, allows you to create a band in which it is suitable to display the image source. By default, the upper threshold is double.max and lower threshold is double.min. This means the image should always display.

LowerThreshold

This property gets and sets the lower threshold in the scale at which to display the image.

public double LowerThreshold { get; set; }

Property Value

Double
This property gets the lower threshold in the scale at which to display the image.

Remarks:

Below the lower threshold in scale, the image will not be displayed. This, in conjunction with the UpperThreshold property, allows you to create a band in which it is suitable to display the image source. By default, the upper threshold is double.max and lower threshold is double.min. This means the image should always display.

ScaleFactor

The scale factor when drawing the primitive image. For example I am looking for an image with 100100px, If the ScaleFactor is set to 2, it means the component will get the image with 200200px. We want to keep it as 1 (by default) for most cases.

public double ScaleFactor { get; set; }

Property Value

Double

Projection

public Projection Projection { get; }

Property Value

Projection

Attribution

public string Attribution { get; set; }

Property Value

String

RequestDrawingInterval

public TimeSpan RequestDrawingInterval { get; set; }

Property Value

TimeSpan

Name

This property gets and sets the name for the layer.

public string Name { get; set; }

Property Value

String

Remarks:

The name is user defined. It is useful to set, as it may be used for higher level components such as legends, etc.

IsOpen

This property returns true if the Layer is open and false if it is not.

public bool IsOpen { get; }

Property Value

Boolean

Remarks:

This method is the concrete wrapper for the abstract method IsOpenCore. Various methods on the Layer require that it be in an open state. If one of those methods is called when the state is not open, then the method will throw an exception. To enter the open state, you must call the Layer Open method. The method will raise an exception if the current Layer is already open.

As this is a concrete public method that wraps a Core method, we reserve the right to add events and other logic to pre- or post-process data returned by the Core version of the method. In this way, we leave our framework open on our end, but also allow you the developer to extend our logic to suit your needs. If you have questions about this, please contact our support team as we would be happy to work with you on extending our framework.

IsVisible

This property gets and set the visible state of the layer.

public bool IsVisible { get; set; }

Property Value

Boolean

Remarks:

If this property is set to false, the layer will not draw. We ensure this in the Draw method. This is useful for legends and other controls that control the visibility of layers.

DrawingTime

This property gets the last drawing time for the layer.

public TimeSpan DrawingTime { get; protected set; }

Property Value

TimeSpan

Remarks:

We track the drawing time for the layer and report it back in this method. This is useful for determining the speed of various layers.

DrawingExceptionMode

public DrawingExceptionMode DrawingExceptionMode { get; set; }

Property Value

DrawingExceptionMode

Background

Gets and sets the background of the layer.

public GeoColor Background { get; set; }

Property Value

GeoColor

Transparency

This property gets and sets the amount of transparency to apply to the image.

public float Transparency { get; set; }

Property Value

Single
This property gets the amount of transparency to apply to the image.

Remarks:

None

BlueTranslation

This property gets and sets the amount of blue to apply to the image.

public float BlueTranslation { get; set; }

Property Value

Single
This property gets the amount of blue to apply to the image.

Remarks:

None

RedTranslation

This property gets and sets the amount of red to apply to the image.

public float RedTranslation { get; set; }

Property Value

Single
This property gets the amount of red to apply to the image.

Remarks:

None

GreenTranslation

This property gets and sets the amount of green to apply to the image.

public float GreenTranslation { get; set; }

Property Value

Single
This property gets the amount of green to apply to the image.

Remarks:

None

KeyColors

Gets a value represents a collection of key colors. If SupportKeyColor property is false, it will throw exception when you use KeyColors.

public Collection<GeoColor> KeyColors { get; }

Property Value

Collection<GeoColor>

Remarks:

It will make these colors transparent when draw image.

IsNegative

This property gets and sets whether the image should be converted to negative (inverse colors).

public bool IsNegative { get; set; }

Property Value

Boolean
This property gets and sets whether the image should be converted to negative (inverse colors).

Remarks:

None

IsGrayscale

This property gets and sets if the image should be converted to grayscale.

public bool IsGrayscale { get; set; }

Property Value

Boolean

        This property gets and sets if the image should be converted to grayscale.

Remarks:

None

ThreadSafe

public ThreadSafetyLevel ThreadSafe { get; set; }

Property Value

ThreadSafetyLevel

ColorMappings

ColorMapping

public Dictionary<GeoColor, GeoColor> ColorMappings { get; }

Property Value

Dictionary<GeoColor, GeoColor>

WrappingMode

public WrappingMode WrappingMode { get; set; }

Property Value

WrappingMode

WrappingExtent

public RectangleShape WrappingExtent { get; set; }

Property Value

RectangleShape

Constructors

GeoTiffRasterLayer()

This is a constructor for the class.

public GeoTiffRasterLayer()

Remarks:

If you use this constructor then, you need to set the PathFilename property manually before using the layer.

GeoTiffRasterLayer(String)

This is a constructor for the class.

public GeoTiffRasterLayer(string imagePathFilename)

Parameters

imagePathFilename String
This parameter is the path and filename of the TIFF file you want to use.

Remarks:

This constructor gets the layer ready to use.

GeoTiffRasterLayer(String, String)

This is a constructor for the class.

public GeoTiffRasterLayer(string imagePathFilename, string worldfilePathFilename)

Parameters

imagePathFilename String
This parameter is the path and filename of the TIFF file you want to use.

worldfilePathFilename String
This parameter is the world file path and filename for the TIFF file you want to use.

Remarks:

This constructor gets the layer ready to use.

GeoTiffRasterLayer(String, RectangleShape)

This is a constructor for the class.

public GeoTiffRasterLayer(string imagePathFilename, RectangleShape imageWorldExtent)

Parameters

imagePathFilename String
This parameter is the path and filename of the TIFF file you want to use.

imageWorldExtent RectangleShape
This parameter is the image extent of the TIFF file you want to use.

Remarks:

This constructor gets the layer ready to use.

Methods

DrawCore(GeoCanvas, Collection<SimpleCandidate>)

This property gets and sets the path and filename of the TIFF file you want to use.

protected void DrawCore(GeoCanvas canvas, Collection<SimpleCandidate> labelsInAllLayers)

Parameters

canvas GeoCanvas

labelsInAllLayers Collection<SimpleCandidate>

Remarks:

This should be the complete path and filename for a TIFF file.

Events

DrawingAttribution

public event EventHandler<DrawingAttributionLayerEventArgs> DrawingAttribution;

DrawnAttribution

public event EventHandler<DrawnAttributionLayerEventArgs> DrawnAttribution;

DrawingProgressChanged

public event EventHandler<DrawingProgressChangedEventArgs> DrawingProgressChanged;

RequestedDrawing

public event EventHandler<RequestedDrawingLayerEventArgs> RequestedDrawing;

RequestingDrawing

public event EventHandler<RequestingDrawingLayerEventArgs> RequestingDrawing;

DrawingException

public event EventHandler<DrawingExceptionLayerEventArgs> DrawingException;

DrawnException

public event EventHandler<DrawnExceptionLayerEventArgs> DrawnException;