DrawGradientLine(Int32,Int32,Int32,Int32,Int32,Int32,Color,Color,Boolean) Method

In This Topic

Draws a linear gradient line on a GdPicture image.

Syntax

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

'Declaration
 
Public Overloads Function DrawGradientLine( _
   ByVal ImageID As Integer, _
   ByVal SrcLeft As Integer, _
   ByVal SrcTop As Integer, _
   ByVal DstLeft As Integer, _
   ByVal DstTop As Integer, _
   ByVal PenWidth As Integer, _
   ByVal StartColor As Color, _
   ByVal EndColor As Color, _
   ByVal AntiAlias As Boolean _
) As GdPictureStatus

public GdPictureStatus DrawGradientLine( 
   int ImageID,
   int SrcLeft,
   int SrcTop,
   int DstLeft,
   int DstTop,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

public function DrawGradientLine( 
    ImageID: Integer;
    SrcLeft: Integer;
    SrcTop: Integer;
    DstLeft: Integer;
    DstTop: Integer;
    PenWidth: Integer;
    StartColor: Color;
    EndColor: Color;
    AntiAlias: Boolean
): GdPictureStatus;

public function DrawGradientLine( 
   ImageID : int,
   SrcLeft : int,
   SrcTop : int,
   DstLeft : int,
   DstTop : int,
   PenWidth : int,
   StartColor : Color,
   EndColor : Color,
   AntiAlias : boolean
) : GdPictureStatus;

public: GdPictureStatus DrawGradientLine( 
   int ImageID,
   int SrcLeft,
   int SrcTop,
   int DstLeft,
   int DstTop,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

public:
GdPictureStatus DrawGradientLine( 
   int ImageID,
   int SrcLeft,
   int SrcTop,
   int DstLeft,
   int DstTop,
   int PenWidth,
   Color StartColor,
   Color EndColor,
   bool AntiAlias
)

Parameters

ImageID: GdPicture image identifier.
SrcLeft: Specifies the x-coordinate of the starting point of the line.
SrcTop: Specifies the y-coordinate of the starting point of the line.
DstLeft: Specifies the x-coordinate of the ending point of the line.
DstTop: Specifies the y-coordinate of the ending point of the line.
PenWidth: The width, in pixel, of the pen used to draw the line.
StartColor: Starting color of the gradient line, as Color object. A suitable color value can be obtained by using the ARGB() method.
EndColor: Ending color of the gradient line, 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 line on a GdPicture image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int startLeft = 10, startTop = 20, endLeft = 200, endTop = 150;
    int penWidth = 15;
    Color startColor = gdpictureImaging.ARGB(255, 0, 0, 255), endColor = gdpictureImaging.ARGB(255, 255, 255, 0);
    int imageID = gdpictureImaging.CreateNewGdPictureImage(400, 400, System.Drawing.Imaging.PixelFormat.Format24bppRgb, gdpictureImaging.ARGB(0, 0, 0, 0));
 
    // Draw gradient line. The AntiAlias parameter is set to true to apply antialiasing algorithm, i.e. to improve the appearance of the line boundary.
    gdpictureImaging.DrawGradientLine(imageID, startLeft, startTop, endLeft, endTop, penWidth, startColor, endColor, true);
 
    gdpictureImaging.SaveAsPNG(imageID, "output.png");
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

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