GraphicsViewGeoCanvas¶

Namespace: ThinkGeo.UI.Maui

Implements a GeoCanvas that renders using a GeoGraphicsView.

public class GraphicsViewGeoCanvas : ThinkGeo.Core.GeoCanvas, ThinkGeo.Core.IGeoCanvasRotatable

Inheritance object → GeoCanvas → GraphicsViewGeoCanvas
Implements IGeoCanvasRotatable

Properties¶

RotationAngle¶

Gets or sets the rotation angle applied during drawing operations.

public double RotationAngle { get; set; }

Property Value¶

double

PivotX¶

Gets or sets the pivot X coordinate used for rotation.

public double PivotX { get; set; }

Property Value¶

double

PivotY¶

Gets or sets the pivot Y coordinate used for rotation.

public double PivotY { get; set; }

Property Value¶

double

CurrentScale¶

public double CurrentScale { get; }

Property Value¶

double

FontDisplayDensity¶

public double FontDisplayDensity { get; }

Property Value¶

double

DrawingQuality¶

public DrawingQuality DrawingQuality { get; set; }

Property Value¶

DrawingQuality

MapUnit¶

public GeographyUnit MapUnit { get; }

Property Value¶

GeographyUnit

Width¶

public float Width { get; protected set; }

Property Value¶

float

Height¶

public float Height { get; protected set; }

Property Value¶

float

CurrentWorldExtent¶

public RectangleShape CurrentWorldExtent { get; protected set; }

Property Value¶

RectangleShape

SupportKeyColor¶

public bool SupportKeyColor { get; }

Property Value¶

bool

KeyColors¶

public Collection<GeoColor> KeyColors { get; }

Property Value¶

Collection<GeoColor>

NativeImage¶

public object NativeImage { get; }

Property Value¶

object

IsDrawing¶

public bool IsDrawing { get; protected set; }

Property Value¶

bool

Dpi¶

public float Dpi { get; set; }

Property Value¶

float

ScaleFactor¶

public float ScaleFactor { get; set; }

Property Value¶

float

CancellationToken¶

public CancellationToken CancellationToken { get; set; }

Property Value¶

CancellationToken

ClippingArea¶

public RectangleShape ClippingArea { get; set; }

Property Value¶

RectangleShape

Constructors¶

GraphicsViewGeoCanvas()¶

public GraphicsViewGeoCanvas()

Methods¶

DrawArcCore(GeoPen, float, float, float, float, float, float, DrawingLevel)¶

Draws an arc using the specified parameters.

protected void DrawArcCore(GeoPen pen, float x, float y, float width, float height, float startAngle, float sweepAngle, DrawingLevel drawingLevel)

Parameters¶

pen GeoPen
The pen used to render the arc outline.

x float
The x-coordinate of the bounding rectangle.

y float
The y-coordinate of the bounding rectangle.

width float
The width of the bounding rectangle.

height float
The height of the bounding rectangle.

startAngle float
The starting angle of the arc.

sweepAngle float
The sweep angle of the arc.

drawingLevel DrawingLevel
The drawing level used for ordering.

Returns¶

void

DrawAreaCore(IEnumerable<ScreenPointF[]>, GeoPen, GeoBrush, DrawingLevel, float, float, PenBrushDrawingOrder)¶

Draws a filled area defined by the provided screen point paths.

protected void DrawAreaCore(IEnumerable<ScreenPointF[]> screenPoints, GeoPen outlinePen, GeoBrush fillBrush, DrawingLevel drawingLevel, float xOffset, float yOffset, PenBrushDrawingOrder penBrushDrawingOrder)

Parameters¶

screenPoints IEnumerable<ScreenPointF[]>
The polygon paths to draw.

outlinePen GeoPen
The pen used for outlining.

fillBrush GeoBrush
The brush used for filling.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

penBrushDrawingOrder PenBrushDrawingOrder
Specifies the drawing order between pen and brush.

Returns¶

void

DrawLineCore(IEnumerable<ScreenPointF>, GeoPen, DrawingLevel, float, float)¶

Draws a line defined by the given screen points.

protected void DrawLineCore(IEnumerable<ScreenPointF> screenPoints, GeoPen linePen, DrawingLevel drawingLevel, float xOffset, float yOffset)

Parameters¶

screenPoints IEnumerable<ScreenPointF>
The points making up the line.

linePen GeoPen
The pen used to draw the line.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

Returns¶

void

DrawEllipseCore(ScreenPointF, float, float, GeoPen, GeoBrush, DrawingLevel, float, float, PenBrushDrawingOrder)¶

Draws an ellipse at the specified screen position.

protected void DrawEllipseCore(ScreenPointF screenPoint, float width, float height, GeoPen outlinePen, GeoBrush fillBrush, DrawingLevel drawingLevel, float xOffset, float yOffset, PenBrushDrawingOrder penBrushDrawingOrder)

Parameters¶

screenPoint ScreenPointF
The center of the ellipse.

width float
The ellipse width.

height float
The ellipse height.

outlinePen GeoPen
The pen used to draw the outline.

fillBrush GeoBrush
The brush used to fill the ellipse.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

penBrushDrawingOrder PenBrushDrawingOrder
Specifies the drawing order between pen and brush.

Returns¶

void

DrawScreenImageWithoutScalingCore(GeoImage, float, float, DrawingLevel, float, float, float, RasterResamplingMode)¶

Draws a screen image without scaling at the specified position.

protected void DrawScreenImageWithoutScalingCore(GeoImage image, float centerXInScreen, float centerYInScreen, DrawingLevel drawingLevel, float xOffset, float yOffset, float rotateAngle, RasterResamplingMode resamplingMode)

Parameters¶

image GeoImage
The image to render.

centerXInScreen float
The x-coordinate of the image center.

centerYInScreen float
The y-coordinate of the image center.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

rotateAngle float
The rotation angle.

resamplingMode RasterResamplingMode

Returns¶

void

DrawScreenImageCore(GeoImage, float, float, float, float, DrawingLevel, float, float, float, RasterResamplingMode)¶

Draws a screen image with scaling at the specified position.

protected void DrawScreenImageCore(GeoImage image, float centerXInScreen, float centerYInScreen, float widthInScreen, float heightInScreen, DrawingLevel drawingLevel, float xOffset, float yOffset, float rotateAngle, RasterResamplingMode resamplingMode)

Parameters¶

image GeoImage
The image to render.

centerXInScreen float
The x-coordinate of the image center.

centerYInScreen float
The y-coordinate of the image center.

widthInScreen float
The image width on screen.

heightInScreen float
The image height on screen.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

rotateAngle float
The rotation angle.

resamplingMode RasterResamplingMode

Returns¶

void

DrawTextCore(string, GeoFont, GeoBrush, GeoPen, IEnumerable<ScreenPointF>, DrawingLevel, float, float, DrawingTextAlignment, float)¶

Draws text at the specified path.

protected void DrawTextCore(string text, GeoFont font, GeoBrush fillBrush, GeoPen haloPen, IEnumerable<ScreenPointF> textPathInScreen, DrawingLevel drawingLevel, float xOffset, float yOffset, DrawingTextAlignment drawingTextAlignment, float rotateAngle)

Parameters¶

text string
The text to draw.

font GeoFont
The font used to render the text.

fillBrush GeoBrush
The brush used to fill the text.

haloPen GeoPen
The pen used to draw the halo.

textPathInScreen IEnumerable<ScreenPointF>
The path defining where the text is drawn.

drawingLevel DrawingLevel
The drawing level used for ordering.

xOffset float
The horizontal offset.

yOffset float
The vertical offset.

drawingTextAlignment DrawingTextAlignment
The alignment applied to the text.

rotateAngle float
The rotation angle.

Returns¶

void

MeasureTextCore(string, GeoFont)¶

Measures the screen-space size of the specified text.

protected DrawingRectangleF MeasureTextCore(string text, GeoFont font)

Parameters¶

text string
The text to measure.

font GeoFont
The font used for measurement.

Returns¶

DrawingRectangleF
A drawing rectangle describing the measured size.

BeginDrawingCore(object, RectangleShape, GeographyUnit)¶

Begins drawing onto the provided graphics view.

protected void BeginDrawingCore(object nativeImage, RectangleShape worldExtent, GeographyUnit drawingMapUnit)

Parameters¶

nativeImage object
The native image that should be a .

worldExtent RectangleShape
The world extent of the drawing area.

drawingMapUnit GeographyUnit
The map unit used for drawing.

Returns¶

void

GetCanvasWidthCore()¶

Gets the width of the canvas in device units.

protected float GetCanvasWidthCore()

Returns¶

float
The canvas width.

GetCanvasHeightCore()¶

Gets the height of the canvas in device units.

protected float GetCanvasHeightCore()

Returns¶

float
The canvas height.

EndDrawingCore()¶

Completes the drawing session.

protected void EndDrawingCore()

Returns¶

void

FlushCore()¶

Flushes pending drawing operations.

protected void FlushCore()

Returns¶

void

Events¶

DrawingProgressChanged¶

public event EventHandler<DrawingProgressChangedEventArgs> DrawingProgressChanged;