DrawGradientLine(Int32,Single,Single,Single,Single,Int32,Int32,Int32,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 Single, _
   ByVal SrcTop As Single, _
   ByVal DstLeft As Single, _
   ByVal DstTop As Single, _
   ByVal PenWidth As Integer, _
   ByVal StartColor As Integer, _
   ByVal EndColor As Integer, _
   ByVal AntiAlias As Boolean _
) As GdPictureStatus

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

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

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

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

public:
GdPictureStatus DrawGradientLine( 
   int ImageID,
   float SrcLeft,
   float SrcTop,
   float DstLeft,
   float DstTop,
   int PenWidth,
   int StartColor,
   int 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 integer value. A suitable color value can be obtained by using the ARGBI() method.
EndColor: Ending color of the gradient line, as integer value. A suitable color value can be obtained by using the ARGBI() method.
AntiAlias: Set to True to apply the Antialiasing algorithm else False.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

This method requires the Image Documents component to run.

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.ARGBI(255, 0, 0, 255), endColor = gdpictureImaging.ARGBI(255, 255, 255, 0);
    int imageID = gdpictureImaging.CreateNewGdPictureImage(400, 400, System.Drawing.Imaging.PixelFormat.Format24bppRgb, gdpictureImaging.ARGBI(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
ARGBI Method