BitmapDataExtensionsDrawArc(IReadWriteBitmapData, IAsyncContext, Color32, Point, Point, Int32, Int32, Single, Boolean, Boolean, DrawingOptions) Method

public static bool DrawArc(
	this IReadWriteBitmapData bitmapData,
	IAsyncContext context,
	Color32 color,
	Point startPoint,
	Point endPoint,
	int radiusX,
	int radiusY,
	float rotationAngle,
	bool isLargeArc,
	bool isClockwise,
	DrawingOptions drawingOptions = null
)

<ExtensionAttribute>
Public Shared Function DrawArc ( 
	bitmapData As IReadWriteBitmapData,
	context As IAsyncContext,
	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
) As Boolean

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

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

Parameters

bitmapData  IReadWriteBitmapData

The IReadWriteBitmapData instance to draw on.

context  IAsyncContext

An IAsyncContext instance that contains information for asynchronous processing about the current operation.

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: .

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.

This method blocks the caller thread, but if context belongs to an async top level method, then the execution may already run on a pool thread. Degree of parallelism, the ability of cancellation and reporting progress depend on how these were configured at the top level method. To reconfigure the degree of parallelism of an existing context, you can use the AsyncContextWrapper class.

Alternatively, you can use this method to specify the degree of parallelism for synchronous execution. For example, by passing AsyncHelper.SingleThreadContext to the context parameter the method will be forced to use a single thread only.

When reporting progress, this library always passes a DrawingOperation instance to the generic methods of the IAsyncProgress interface.

Reference