Color.GetAlpha method

Applies to: desktop apps only

The Color::GetAlpha method gets the alpha component of this Color object.

Syntax

BYTE GetAlpha();

Parameters

This method has no parameters.

Return value

Type:

Type: BYTE

This method returns the alpha component of this color.

Examples

The following example creates a Color object, gets the alpha component of the color, and creates a second Color object that uses the same alpha component. It then fills a rectangle by using a Brush object based on the second color.


VOID Example_GetAlpha(HDC hdc)
{
   Graphics graphics(hdc);

   // Create a Color object with an alpha component value of 128.
   Color firstColor(128, 255, 0, 0);

   // Get the alpha value of firstColor.
   int alpha = firstColor.GetAlpha();

   // Create a new Color object with the same alpha component value as firstColor.
   Color secondColor(alpha, 0, 0, 255);

   // Create a SolidBrush object with secondColor, and use it to fill a rectangle.
   SolidBrush alphaBrush(secondColor);
   graphics.FillRectangle(&alphaBrush, Rect(0, 0, 100, 100));
}

Requirements

Minimum supported client

Windows XP, Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Product

GDI+ 1.0

Header

Gdipluscolor.h (include Gdiplus.h)

Library

Gdiplus.lib

DLL

Gdiplus.dll

See also

Color
Color::GetAlpha
Color::GetB
Color::GetBlue
Color::GetG
Color::GetGreen
Color::GetR
Color::GetRed
Color::GetValue

 

 

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Build date: 3/6/2012

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