DrawGdPictureImageTransparencyColor(Int32,Int32,Color,Single,Int32,Int32,Int32,Int32,InterpolationMode) Method

In This Topic

Draws a GdPicture image into another GdPicture image setting a specific color of the image to draw as transparent. This method takes a percentage threshold parameter regarding the color to set as transparent. Ie: A threshold value of 90 means that all the color values which are within 90% of the color value parameter will be set as transparent.

Syntax

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

'Declaration
 
Public Overloads Function DrawGdPictureImageTransparencyColor( _
   ByVal SrcImage As Integer, _
   ByVal DstImage As Integer, _
   ByVal TransparentColor As Color, _
   ByVal Threshold As Single, _
   ByVal DstLeft As Integer, _
   ByVal DstTop As Integer, _
   ByVal DstWidth As Integer, _
   ByVal DstHeight As Integer, _
   ByVal InterpolationMode As InterpolationMode _
) As GdPictureStatus

public GdPictureStatus DrawGdPictureImageTransparencyColor( 
   int SrcImage,
   int DstImage,
   Color TransparentColor,
   float Threshold,
   int DstLeft,
   int DstTop,
   int DstWidth,
   int DstHeight,
   InterpolationMode InterpolationMode
)

public function DrawGdPictureImageTransparencyColor( 
    SrcImage: Integer;
    DstImage: Integer;
    TransparentColor: Color;
    Threshold: Single;
    DstLeft: Integer;
    DstTop: Integer;
    DstWidth: Integer;
    DstHeight: Integer;
    InterpolationMode: InterpolationMode
): GdPictureStatus;

public function DrawGdPictureImageTransparencyColor( 
   SrcImage : int,
   DstImage : int,
   TransparentColor : Color,
   Threshold : float,
   DstLeft : int,
   DstTop : int,
   DstWidth : int,
   DstHeight : int,
   InterpolationMode : InterpolationMode
) : GdPictureStatus;

public: GdPictureStatus DrawGdPictureImageTransparencyColor( 
   int SrcImage,
   int DstImage,
   Color TransparentColor,
   float Threshold,
   int DstLeft,
   int DstTop,
   int DstWidth,
   int DstHeight,
   InterpolationMode InterpolationMode
)

public:
GdPictureStatus DrawGdPictureImageTransparencyColor( 
   int SrcImage,
   int DstImage,
   Color TransparentColor,
   float Threshold,
   int DstLeft,
   int DstTop,
   int DstWidth,
   int DstHeight,
   InterpolationMode InterpolationMode
)

Parameters

SrcImage: GdPicture image identifier. Specifies the image to be drawn from.
DstImage: GdPicture image identifier. specifies the image to draw to.
TransparentColor: The color to set as transparent. A suitable color value can be obtained by using the ARGB() method.
Threshold: Percentage threshold between 0 and 100.
DstLeft: Specifies the x-coordinate in pixels of the upper-left corner of the destination rectangle at which to draw the image.
DstTop: Specifies the y-coordinate in pixels of the upper-left corner of the destination rectangle at which to draw the image.
DstWidth: Specifies the width, in pixels, of the destination rectangle at which to draw the image.
DstHeight: Specifies the height, in pixels, of the destination rectangle at which to draw the image.
InterpolationMode: A member of the Drawing2D.InterpolationMode enumeration.

Return Value

A member of the GdPictureStatus enumeration.

Example

Rendering an image with the circle into the background image, with a blue color set as transparent. The result is saved into a PNG file.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // Create background image
    int backImage = gdpictureImaging.CreateNewGdPictureImage(320, 200, 32, Color.Green);
 
    // Create image with blue background, and draw red circle in it
    int circleImage = gdpictureImaging.CreateNewGdPictureImage(80, 80, 32, Color.Blue);
    gdpictureImaging.DrawFilledCircle(circleImage, 40, 40, 60, Color.Red, false);
 
    // Draw image with circle into the background image. Blue color will be omited.
    gdpictureImaging.DrawGdPictureImageTransparencyColor(circleImage, backImage, Color.Blue, 90f, 0, 0, 80, 80, System.Drawing.Drawing2D.InterpolationMode.Default);
    gdpictureImaging.SaveAsPNG(backImage, "output.png");
 
    // Release used resources
    gdpictureImaging.ReleaseGdPictureImage(circleImage);
    gdpictureImaging.ReleaseGdPictureImage(backImage);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List