ReadWriteBitmapDataExtensionsBeginDrawTextOutline(IReadWriteBitmapData, Pen, GlyphRun, PointF, DrawingOptions, AsyncConfig) Method
Begins to draw the outline of a text represented by a
GlyphRun instance with the specified
Pen..
Namespace: KGySoft.Drawing.WpfAssembly: KGySoft.Drawing.Wpf (in KGySoft.Drawing.Wpf.dll) Version: 10.0.0-rc.1
public static IAsyncResult BeginDrawTextOutline(
this IReadWriteBitmapData bitmapData,
Pen pen,
GlyphRun text,
PointF offset,
DrawingOptions? drawingOptions = null,
AsyncConfig? asyncConfig = null
)
<ExtensionAttribute>
Public Shared Function BeginDrawTextOutline (
bitmapData As IReadWriteBitmapData,
pen As Pen,
text As GlyphRun,
offset As PointF,
Optional drawingOptions As DrawingOptions = Nothing,
Optional asyncConfig As AsyncConfig = Nothing
) As IAsyncResult
public:
[ExtensionAttribute]
static IAsyncResult^ BeginDrawTextOutline(
IReadWriteBitmapData^ bitmapData,
Pen^ pen,
GlyphRun^ text,
PointF offset,
DrawingOptions^ drawingOptions = nullptr,
AsyncConfig^ asyncConfig = nullptr
)
[<ExtensionAttribute>]
static member BeginDrawTextOutline :
bitmapData : IReadWriteBitmapData *
pen : Pen *
text : GlyphRun *
offset : PointF *
?drawingOptions : DrawingOptions *
?asyncConfig : AsyncConfig
(* Defaults:
let _drawingOptions = defaultArg drawingOptions null
let _asyncConfig = defaultArg asyncConfig null
*)
-> IAsyncResult
- bitmapData IReadWriteBitmapData
- The IReadWriteBitmapData instance to draw on.
- pen Pen
- The Pen that determines the characteristics of the text outline.
- text GlyphRun
- A GlyphRun instance representing the text to draw.
- offset PointF
- The offset to be applied to the BaselineOrigin of text.
- 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: .
IAsyncResultAn
IAsyncResult that represents the asynchronous operation, which could still be pending.In Visual Basic and C#, you can call this method as an instance method on any object of type
IReadWriteBitmapData. When you use instance method syntax to call this method, omit the first parameter. For more information, see
Extension Methods (Visual Basic) or
Extension Methods (C# Programming Guide).
This method draws only the outline of a text. To draw a text with filled characters, use the BeginDrawText methods instead.
To draw a text with both filled and outlined characters, instead of calling
BeginDrawText
and
BeginDrawTextOutline consecutively, you can achieve a better performance by creating a
Path once, and then calling
the
BeginFillPath and
BeginDrawPath methods.
You can convert the specified
text to a
Path by obtaining a
Geometry instance by calling
the
GlyphRun.BuildGeometry method, and then using the
ToPath extension method.
If you draw the text without antialiasing, it is recommended to set the
FastThinLines to
in
drawingOptions
so the outline correctly aligns to the filled area.
When AntiAliasing is set in drawingOptions and you use non-monochromatic colors, it is recommended to specify Linear
color space when you obtain the IReadWriteBitmapData instance, especially for small fonts; otherwise, the quality of the drawn text can be poor if alpha colors are blended in the sRGB color space.
See more details at the Examples section of the WorkingColorSpace enumeration.
In .NET Framework 4.0 and above you can use also the DrawTextOutlineAsync methods.
To finish the operation and to get the exception that occurred during the operation you have to call the EndDrawTextOutline method.
This method is not a blocking call even if the MaxDegreeOfParallelism property of the asyncConfig parameter is 1.
