Colours

The Colour object:

• A Colour is a structure:

  	struct Colour {
  		byte alpha;
  		byte red;
  		byte green;
  		byte blue;
  	};
  

• The maximum value of any byte is 0xFF (decimal 255) and minimum value is 0.
• The first byte stores the alpha channel transparency information. 0 means opaque, FF means fully transparent.
• The next three bytes give the intensity of red, green and blue light.
• So {0,0xFF,0,0} is bright red, and {0,0x7F,0,0x7F} is dark purple.
• Colours can be constructed with the rgb function.

Predefined colours:

#define TRANSPARENT     argb(0xFF,0xFF,0xFF,0xFF)

#define BLACK           rgb(0x00,0x00,0x00)
#define WHITE           rgb(0xFF,0xFF,0xFF)
#define BLUE            rgb(0x00,0x00,0xFF)
#define YELLOW          rgb(0xFF,0xFF,0x00)
#define GREEN           rgb(0x00,0xFF,0x00)
#define MAGENTA         rgb(0xFF,0x00,0xFF)
#define RED             rgb(0xFF,0x00,0x00)
#define CYAN            rgb(0x00,0xFF,0xFF)

#define GREY            rgb(0x80,0x80,0x80)
#define GRAY            rgb(0x80,0x80,0x80)
#define LIGHT_GREY      rgb(0xC0,0xC0,0xC0)
#define LIGHT_GRAY      rgb(0xC0,0xC0,0xC0)
#define PALE_GREY       rgb(0xE0,0xE0,0xE0)
#define PALE_GRAY       rgb(0xE0,0xE0,0xE0)
#define DARK_GREY       rgb(0x40,0x40,0x40)
#define DARK_GRAY       rgb(0x40,0x40,0x40)

#define DARK_BLUE       rgb(0x00,0x00,0x80)
#define DARK_GREEN      rgb(0x00,0x80,0x00)
#define DARK_RED        rgb(0x80,0x00,0x00)
#define LIGHT_BLUE      rgb(0x80,0xC0,0xFF)
#define LIGHT_GREEN     rgb(0x80,0xFF,0x80)
#define LIGHT_RED       rgb(0xFF,0xC0,0xFF)
#define PINK            rgb(0xFF,0xAF,0xAF)
#define BROWN           rgb(0x60,0x30,0x00)
#define ORANGE          rgb(0xFF,0x80,0x00)
#define PURPLE          rgb(0xC0,0x00,0xFF)
#define LIME            rgb(0x80,0xFF,0x00)