TdxAlphaColor Type

A 4-byte unsigned integer that stores red, green, blue, and alpha (opacity) color component values (from 0 to 255).

Declaration

TdxAlphaColor = type System.Types.DWORD;

Referenced Class

Type	Description
DWORD	A 4-byte unsigned integer value that stores color components in ARGB (Alpha, Red, Green, and Blue) format. This color format corresponds to the ARGB color mapping in GDI+.

Remarks

TdxAlphaColor is a TColor counterpart with support for transparency. All DevExpress components that allow you to specify transparent colors use this type.

How to Use TdxAlphaColor

All DevExpress controls that use TdxAlphaColor for UI element or content colors^[1], automatically add the dxCoreGraphics unit to the project (no action is necessary).

If you need to use TdxAlphaColor or other color-related DevExpress types and methods in a project without such controls, add the dxCoreGraphics unit to the uses clause (in Delphi) or include the dxCoreGraphics header (HPP) to the required source code file (in C++Builder).

Useful TdxAlphaColor-Related APIs

The TdxAlphaColors record contains multiple TdxAlphaColor constants and declares multiple color-related utility methods.

In addition, you can call the following global methods (also declared in the dxCoreGraphics unit) to work with TdxAlphaColor values:

Conversion Methods

dxAlphaColorToColor(dxCoreGraphics.TdxAlphaColor)

dxAlphaColorToColor(dxCoreGraphics.TdxAlphaColor,System.Byte)

Converts a specified TdxAlphaColor value to the TColor type.

dxAlphaColorToRGBQuad

Converts a specified TdxAlphaColor value to the TRGBQuad type.

dxColorToAlphaColor

Converts a specified TColor value to the TdxAlphaColor type.

dxColorToRGBQuad

Converts a specified TColor value to the TRGBQuad type.

dxMakeAlphaColor(System.Byte,System.Byte,System.Byte)

dxMakeAlphaColor(System.Byte,System.Byte,System.Byte,System.Byte)

dxMakeAlphaColor(Vcl.Graphics.TColor,System.Byte)

Creates a TdxAlphaColor value from individual color component values and returns it as the function’s result.

dxRGBQuadToColor

Converts a specified TRGBQuad value to the TColor type.

Utility Methods

dxGetAlpha

Extracts the alpha value (also called transparency level) from a specified color.

dxGetBlue

Extracts the blue color component value from a specified color.

dxGetGreen

Extracts the green color component value from a specified color.

dxGetRed

Extracts the red color component value from a specified color.

Footnotes

1. TdxChartControl, for example.