DrawGradientCurve Method

In This Topic

Draws a linear gradient curve on a GdPicture image.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function DrawGradientCurve( _
   ByVal ImageID As Integer, _
   ByVal arPoints() As Point, _
   ByVal PenWidth As Integer, _
   ByVal StartColor As Color, _
   ByVal EndColor As Color, _
   ByVal AntiAlias As Boolean _
) As GdPictureStatus

public GdPictureStatus DrawGradientCurve( 
   int ImageID,
   Point[] arPoints,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

public function DrawGradientCurve( 
    ImageID: Integer;
    arPoints: Pointarray of;
    PenWidth: Integer;
    StartColor: Color;
    EndColor: Color;
    AntiAlias: Boolean
): GdPictureStatus;

public function DrawGradientCurve( 
   ImageID : int,
   arPoints : Point[],
   PenWidth : int,
   StartColor : Color,
   EndColor : Color,
   AntiAlias : boolean
) : GdPictureStatus;

public: GdPictureStatus DrawGradientCurve( 
   int ImageID,
   Point[]* arPoints,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

public:
GdPictureStatus DrawGradientCurve( 
   int ImageID,
   array<Point>^ arPoints,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

Parameters

ImageID: GdPicture image identifier.
arPoints: Array of System.Drawing.Point that specifies the coordinates that the cardinal spline passes through.
PenWidth: The width, in pixel, of the pen used to draw the curve.
StartColor: Starting of the curve, as Color object. A suitable color value can be obtained by using the ARGB() method.
EndColor: Ending color of the gradient curve, as Color object. A suitable color value can be obtained by using the ARGB() method.
AntiAlias: Set to True to apply the Antialiasing algorithm else False.

Return Value

A member of the GdPictureStatus enumeration.

Example

Drawing a linear gradient curve on a GdPicture image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    Point[] points = new Point[] {
        new Point(200,100),
        new Point(350,150),
        new Point(300,250),
        new Point(150,200),
    };
    int penWidth = 10;
    Color startColor = Color.Blue, endColor = Color.Yellow;
    int imageID = gdpictureImaging.CreateNewGdPictureImage(400, 400, System.Drawing.Imaging.PixelFormat.Format24bppRgb, Color.White);
 
    // Draw gradient curve. The AntiAlias parameter is set to true to apply antialiasing algorithm, i.e. to improve the appearance of the curve boundary.
    gdpictureImaging.DrawGradientCurve(imageID, points, penWidth, startColor, endColor, true);
 
    gdpictureImaging.SaveAsPNG(imageID, "output.png");
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
ARGB(Byte,Byte,Byte,Byte) Method