BitmapDataExtensionsBeginDrawArc(IReadWriteBitmapData, Color32, Point, Point, Int32, Int32, Single, Boolean, Boolean, DrawingOptions, AsyncConfig) Method

public static IAsyncResult BeginDrawArc(
	this IReadWriteBitmapData bitmapData,
	Color32 color,
	Point startPoint,
	Point endPoint,
	int radiusX,
	int radiusY,
	float rotationAngle,
	bool isLargeArc,
	bool isClockwise,
	DrawingOptions? drawingOptions = null,
	AsyncConfig? asyncConfig = null
)

<ExtensionAttribute>
Public Shared Function BeginDrawArc ( 
	bitmapData As IReadWriteBitmapData,
	color As Color32,
	startPoint As Point,
	endPoint As Point,
	radiusX As Integer,
	radiusY As Integer,
	rotationAngle As Single,
	isLargeArc As Boolean,
	isClockwise As Boolean,
	Optional drawingOptions As DrawingOptions = Nothing,
	Optional asyncConfig As AsyncConfig = Nothing
) As IAsyncResult

public:
[ExtensionAttribute]
static IAsyncResult^ BeginDrawArc(
	IReadWriteBitmapData^ bitmapData, 
	Color32 color, 
	Point startPoint, 
	Point endPoint, 
	int radiusX, 
	int radiusY, 
	float rotationAngle, 
	bool isLargeArc, 
	bool isClockwise, 
	DrawingOptions^ drawingOptions = nullptr, 
	AsyncConfig^ asyncConfig = nullptr
)

[<ExtensionAttribute>]
static member BeginDrawArc : 
        bitmapData : IReadWriteBitmapData * 
        color : Color32 * 
        startPoint : Point * 
        endPoint : Point * 
        radiusX : int * 
        radiusY : int * 
        rotationAngle : float32 * 
        isLargeArc : bool * 
        isClockwise : bool * 
        ?drawingOptions : DrawingOptions * 
        ?asyncConfig : AsyncConfig 
(* Defaults:
        let _drawingOptions = defaultArg drawingOptions null
        let _asyncConfig = defaultArg asyncConfig null
*)
-> IAsyncResult 

Parameters

bitmapData  IReadWriteBitmapData

The IReadWriteBitmapData instance to draw on.

color  Color32

The color of the arc to draw.

startPoint  Point

The starting point of the arc to add.

endPoint  Point

The end point of the arc to add.

radiusX  Int32

The radius along the x-axis of the ellipse from which the arc is drawn.

radiusY  Int32

The radius along the y-axis of the ellipse from which the arc is drawn.

rotationAngle  Single

The angle, in degrees, by which the ellipse is rotated relative to the x-axis.

isLargeArc  Boolean

if the arc span is 180 degrees or greater; otherwise, .

isClockwise  Boolean

if the arc is drawn in a clockwise direction; otherwise, .

drawingOptions  DrawingOptions  (Optional)

A DrawingOptions instance that specifies the drawing options to use. If , then the default options are used. This parameter is optional.
Default value: .

asyncConfig  AsyncConfig  (Optional)

The configuration of the asynchronous operation such as parallelization, cancellation, reporting progress, etc. When Progress is set in this parameter, then this library always passes a DrawingOperation instance to the generic methods of the IAsyncProgress interface. This parameter is optional.
Default value: .

Return Value

Usage Note

This method tries to use a shortcut to draw the arc directly, which is faster than creating a Path and adding the arc to it. A shortcut is possible when drawingOptions is and the specified color is opaque, or when FastThinLines is enabled in drawingOptions, and it specifies that no anti-aliasing and no alpha blending is required, the transformation is the identity matrix, and neither Quantizer nor Ditherer is specified.

When no shortcut can be used and the same arc is drawn repeatedly, creating a Path with PreferCaching enabled can provide a better performance.

This overload provides the same parameters that are used in SVG paths for elliptical arcs, and also by several XAML-based frameworks, such as WPF, UWP, and WinUI.

If radiusX or radiusY is negative, their absolute value will be used.

In .NET Framework 4.0 and above you can use also the DrawArcAsync methods.

To finish the operation and to get the exception that occurred during the operation you have to call the EndDrawArc method.

This method is not a blocking call even if the MaxDegreeOfParallelism property of the asyncConfig parameter is 1.

If the arc is drawn by using a shortcut, then the operation is executed synchronously, it cannot be canceled, it is not parallelized, and there is no progress reporting, regardless of the asyncConfig parameter.

Reference