rack::color Namespace Reference

Utilities for NVGcolor. More...

Functions
bool	isEqual (NVGcolor a, NVGcolor b)
	Returns whether all RGBA color components are equal.
NVGcolor	clamp (NVGcolor a)
	Limits RGBA color components between 0 and 1.
NVGcolor	minus (NVGcolor a, NVGcolor b)
	Subtracts RGB color components elementwise.
NVGcolor	plus (NVGcolor a, NVGcolor b)
	Adds RGB color components elementwise.
NVGcolor	mult (NVGcolor a, NVGcolor b)
	Multiplies RGB color components elementwise.
NVGcolor	mult (NVGcolor a, float x)
	Multiplies RGB color components by a scalar.
NVGcolor	lerp (NVGcolor a, NVGcolor b, float t)
	Interpolates RGBA color components.
NVGcolor	screen (NVGcolor a, NVGcolor b)
	Screen blending with alpha compositing.
NVGcolor	alpha (NVGcolor a, float alpha)
	Multiplies alpha value by a scalar.
NVGcolor	fromHexString (std::string s)
	Converts from hex string of the form "#RRGGBB" or "#RRGGBBAA".
std::string	toHexString (NVGcolor c)
	Converts color to hex string of the form "#RRGGBB" if opaque or "#RRGGBBAA" if alpha < 255.

Variables
static const NVGcolor	BLACK_TRANSPARENT = nvgRGBA(0x00, 0x00, 0x00, 0x00)
static const NVGcolor	WHITE_TRANSPARENT = nvgRGBA(0xff, 0xff, 0xff, 0x00)
static const NVGcolor	BLACK = nvgRGB(0x00, 0x00, 0x00)
static const NVGcolor	RED = nvgRGB(0xff, 0x00, 0x00)
static const NVGcolor	GREEN = nvgRGB(0x00, 0xff, 0x00)
static const NVGcolor	BLUE = nvgRGB(0x00, 0x00, 0xff)
static const NVGcolor	CYAN = nvgRGB(0x00, 0xff, 0xff)
static const NVGcolor	MAGENTA = nvgRGB(0xff, 0x00, 0xff)
static const NVGcolor	YELLOW = nvgRGB(0xff, 0xff, 0x00)
static const NVGcolor	WHITE = nvgRGB(0xff, 0xff, 0xff)

Detailed Description

Utilities for NVGcolor.

Function Documentation

isEqual()

bool rack::color::isEqual	(	NVGcolor	a,
		NVGcolor	b )

Returns whether all RGBA color components are equal.

clamp()

NVGcolor rack::color::clamp

(

NVGcolor

a

)

Limits RGBA color components between 0 and 1.

minus()

NVGcolor rack::color::minus	(	NVGcolor	a,
		NVGcolor	b )

Subtracts RGB color components elementwise.

Alpha value is copied from a.

plus()

NVGcolor rack::color::plus	(	NVGcolor	a,
		NVGcolor	b )

Adds RGB color components elementwise.

Alpha value is copied from a.

mult() [1/2]

NVGcolor rack::color::mult	(	NVGcolor	a,
		NVGcolor	b )

Multiplies RGB color components elementwise.

Alpha value is copied from a.

mult() [2/2]

NVGcolor rack::color::mult	(	NVGcolor	a,
		float	x )

Multiplies RGB color components by a scalar.

Alpha value is untouched.

lerp()

NVGcolor rack::color::lerp	(	NVGcolor	a,
		NVGcolor	b,
		float	t )

Interpolates RGBA color components.

screen()

NVGcolor rack::color::screen	(	NVGcolor	a,
		NVGcolor	b )

Screen blending with alpha compositing.

https://en.wikipedia.org/wiki/Blend_modes#Screen

alpha()

NVGcolor rack::color::alpha	(	NVGcolor	a,
		float	alpha )

Multiplies alpha value by a scalar.

RGB color components are untouched.

fromHexString()

NVGcolor rack::color::fromHexString

(

std::string

s

)

Converts from hex string of the form "#RRGGBB" or "#RRGGBBAA".

Must include "#". Returns WHITE on error.

toHexString()

std::string rack::color::toHexString

(

NVGcolor

c

)

Converts color to hex string of the form "#RRGGBB" if opaque or "#RRGGBBAA" if alpha < 255.

Floating point color components are rounded to nearest 8-bit integer.

Variable Documentation

BLACK_TRANSPARENT

const NVGcolor rack::color::BLACK_TRANSPARENT = nvgRGBA(0x00, 0x00, 0x00, 0x00)

static

WHITE_TRANSPARENT

const NVGcolor rack::color::WHITE_TRANSPARENT = nvgRGBA(0xff, 0xff, 0xff, 0x00)

static

BLACK

const NVGcolor rack::color::BLACK = nvgRGB(0x00, 0x00, 0x00)

static

RED

const NVGcolor rack::color::RED = nvgRGB(0xff, 0x00, 0x00)

static

GREEN

const NVGcolor rack::color::GREEN = nvgRGB(0x00, 0xff, 0x00)

static

BLUE

const NVGcolor rack::color::BLUE = nvgRGB(0x00, 0x00, 0xff)

static

CYAN

const NVGcolor rack::color::CYAN = nvgRGB(0x00, 0xff, 0xff)

static

MAGENTA

const NVGcolor rack::color::MAGENTA = nvgRGB(0xff, 0x00, 0xff)

static

YELLOW

const NVGcolor rack::color::YELLOW = nvgRGB(0xff, 0xff, 0x00)

static

WHITE

const NVGcolor rack::color::WHITE = nvgRGB(0xff, 0xff, 0xff)

static