BitmapDataExtensionsDrawQuadraticCurves(IReadWriteBitmapData, Color32, IEnumerablePointF, DrawingOptions) Method

Draws a series of one-pixel wide quadratic Bézier curves with the specified color.

Definition

Namespace: KGySoft.Drawing.Shapes
Assembly: KGySoft.Drawing.Core (in KGySoft.Drawing.Core.dll) Version: 10.0.0-rc.1

C#

public static void DrawQuadraticCurves(
	this IReadWriteBitmapData bitmapData,
	Color32 color,
	IEnumerable<PointF> points,
	DrawingOptions? drawingOptions = null
)

VB

<ExtensionAttribute>
Public Shared Sub DrawQuadraticCurves ( 
	bitmapData As IReadWriteBitmapData,
	color As Color32,
	points As IEnumerable(Of PointF),
	Optional drawingOptions As DrawingOptions = Nothing
)

C++

public:
[ExtensionAttribute]
static void DrawQuadraticCurves(
	IReadWriteBitmapData^ bitmapData, 
	Color32 color, 
	IEnumerable<PointF>^ points, 
	DrawingOptions^ drawingOptions = nullptr
)

F#

[<ExtensionAttribute>]
static member DrawQuadraticCurves : 
        bitmapData : IReadWriteBitmapData * 
        color : Color32 * 
        points : IEnumerable<PointF> * 
        ?drawingOptions : DrawingOptions 
(* Defaults:
        let _drawingOptions = defaultArg drawingOptions null
*)
-> unit

Parameters

bitmapData IReadWriteBitmapData: The IReadWriteBitmapData instance to draw on.
color Color32: The color of the curves to draw.
points IEnumerablePointF: The points of the curves to draw.
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: .

Usage Note

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).

Remarks

In the points parameter 0 or odd number of points are expected.

When points has at least three items, the first three points define the first quadratic curve. Each additional two points define a new quadratic curve, where the last point of the previous curve is the starting point of the next curve.

This method draws quadratic Bézier curves. A quadratic Bézier curve is defined by three points: the starting point, the control point, and the end point. To draw cubic Bézier curves, you can use the DrawBeziers methods. In fact, this method transforms the quadratic curves into cubic Bézier curves internally.

This method tries to use a shortcut to draw the curves directly, which is faster than creating a Path and adding the curves 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 curves are drawn repeatedly, creating a Path with PreferCaching enabled can provide a better performance.

Note

This method adjusts the degree of parallelization automatically, blocks the caller, and does not support cancellation or reporting progress. You can use the overloads that have a ParallelConfig parameter to configure these, while still executing the method synchronously. Alternatively, use the BeginDrawQuadraticCurves or DrawQuadraticCurvesAsync (in .NET Framework 4.0 and above) methods to perform the operation asynchronously.

Exceptions

ArgumentNullException	bitmapData or points is .
ArgumentException	The number of points is not zero, or an odd number.
OverflowException	The coordinates (after a possible transformation specified in drawingOptions) are outside the bounds of an int value.