Inside Macintosh: 3D Graphics Programming With QuickDraw 3D /

Chapter 21 - QuickDraw 3D Color Utilities / QuickDraw 3D Color Utilities Reference

Data Structures

Color Structures

You use an RGB color structure to specify a color. The RGB color structure is defined by the TQ3ColorRGB data type.

typedef struct TQ3ColorRGB {
   float       r;             /*red component*/
   float       g;             /*green component*/
   float       b;             /*blue component*/
} TQ3ColorRGB;

Field Description

r

The red component of the color. The value in this field should be between 0.0 and 1.0.

g

The green component of the color. The value in this field should be between 0.0 and 1.0.

b

The blue component of the color. The value in this field should be between 0.0 and 1.0.

You use an ARGB color structure to specify a color together with an alpha channel. The ARGB color structure is defined by the TQ3ColorARGB data type.

typedef struct TQ3ColorARGB {
   float       a;             /*alpha channel*/
   float       r;             /*red component*/
   float       g;             /*green component*/
   float       b;             /*blue component*/
} TQ3ColorARGB;

Field Description

a

The alpha channel of the color. The value in this field should be between 0.0 (transparent) and 1.0. (solid).

r

The red component of the color. The value in this field should be between 0.0 and 1.0.

g

The green component of the color. The value in this field should be between 0.0 and 1.0.

b

The blue component of the color. The value in this field should be between 0.0 and 1.0.