Color::SetFromCOLORREF method (gdipluscolor.h)

The Color::SetFromCOLORREF method uses a Windows Graphics Device Interface (GDI)COLORREF value to set the ARGB value of this Color object.

Syntax

void SetFromCOLORREF(
  [in] COLORREF rgb
);

Parameters

[in] rgb

Type: COLORREF

GDI COLORREF value that specifies the red, green, and blue components of this Color object's ARGB value. The default value of the alpha component for this Color object is 255.

Return value

None

Remarks

A 32-bit GDI COLORREF value contains three, 8-bit color components. The most significant 8 bits are zeros and are not used, the next 8 bits contain the blue component, the next 8 bits contain the green component, and the last 8 bits (the least significant) contain the red component. Note that the ordering (starting with the high-order bits) of the components in a COLORREF value is blue, green, red; whereas, the ordering of an ARGB value is alpha, red, green, blue.

Examples

The following example creates a Color object and sets a GDI COLORREF value. The code then sets the Color object to the value of the GDI COLORREF value, creates a pen, and draws a line.

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

   // Create a color object.
   Color gdipColor(255, 0, 0, 255);

   // COLORREF is defined as an unsigned long in Wingdi.h
   unsigned long gdiColorRef = RGB(0, 0, 0);   // Set a GDI COLORREF value.

   // Set the color object to the COLORREF value.
   gdipColor.SetFromCOLORREF(gdiColorRef);

   // Create a Pen object based on the Color object.
   Pen pen((gdipColor), 10);

   // Draw a line.
   graphics.DrawLine(&pen, 0, 0, 200, 100);
}

Requirements

See also

Color

Color::MakeARGB

Color::ToCOLORREF