gx #

Description:

gx is a complementary module to gg, that just provides some predefined graphical color names/operations.

NB: gx is going to be merged with gg soon.

Constants #

const (
	black = Color{
		r: 0
		g: 0
		b: 0
	}
	gray = Color{
		r: 128
		g: 128
		b: 128
	}
	white = Color{
		r: 255
		g: 255
		b: 255
	}
	red = Color{
		r: 255
		g: 0
		b: 0
	}
	green = Color{
		r: 0
		g: 255
		b: 0
	}
	blue = Color{
		r: 0
		g: 0
		b: 255
	}
	yellow = Color{
		r: 255
		g: 255
		b: 0
	}
	magenta = Color{
		r: 255
		g: 0
		b: 255
	}
	cyan = Color{
		r: 0
		g: 255
		b: 255
	}
	orange = Color{
		r: 255
		g: 165
		b: 0
	}
	purple = Color{
		r: 128
		g: 0
		b: 128
	}
	indigo = Color{
		r: 75
		g: 0
		b: 130
	}
	pink = Color{
		r: 255
		g: 192
		b: 203
	}
	violet = Color{
		r: 238
		g: 130
		b: 238
	}
	dark_blue = Color{
		r: 0
		g: 0
		b: 139
	}
	dark_gray = Color{
		r: 169
		g: 169
		b: 169
	}
	dark_green = Color{
		r: 0
		g: 100
		b: 0
	}
	dark_red = Color{
		r: 139
		g: 0
		b: 0
	}
	light_blue = Color{
		r: 173
		g: 216
		b: 230
	}
	light_gray = Color{
		r: 211
		g: 211
		b: 211
	}
	light_green = Color{
		r: 144
		g: 238
		b: 144
	}
	light_red = Color{
		r: 255
		g: 204
		b: 203
	}
)

const (
	align_left  = HorizontalAlign.left
	align_right = HorizontalAlign.right
)

TODO: remove these, and use the enum everywhere

fn color_from_string #

fn color_from_string(s string) Color

color_from_string returns a Color, corresponding to the given string or black Color if string is not found in lookup table

fn hex #

fn hex(color int) Color

hex takes in a 32 bit integer and splits it into 4 byte values

fn rgb #

fn rgb(r u8, g u8, b u8) Color

rgb builds a Color instance from given r, g, b values

fn rgba #

fn rgba(r u8, g u8, b u8, a u8) Color

rgba builds a Color instance from given r, g, b, a values

enum HorizontalAlign #

enum HorizontalAlign {
	left = C.FONS_ALIGN_LEFT
	center = C.FONS_ALIGN_CENTER
	right = C.FONS_ALIGN_RIGHT
}

enum VerticalAlign #

enum VerticalAlign {
	top = C.FONS_ALIGN_TOP
	middle = C.FONS_ALIGN_MIDDLE
	bottom = C.FONS_ALIGN_BOTTOM
	baseline = C.FONS_ALIGN_BASELINE
}

struct Color #

struct Color {
pub mut:
	r u8
	g u8
	b u8
	a u8 = 255
}

Color represents a 32 bit color value in sRGB format

fn (Color) + #

fn (a Color) + (b Color) Color

adds b to a, with a maximum value of 255 for each channel

fn (Color) - #

fn (a Color) - (b Color) Color

subtracts b from a, with a minimum value of 0 for each channel

fn (Color) * #

fn (c Color) * (c2 Color) Color

multiplies Color c and c2 keeping channel values in [0, 255] range

fn (Color) / #

fn (c Color) / (c2 Color) Color

/ divides c by c2 and converts each channel's value to u8(int)

fn (Color) over #

fn (a Color) over(b Color) Color

over implements an a over b operation.
see https://keithp.com/~keithp/porterduff/p253-porter.pdf

fn (Color) eq #

fn (c Color) eq(c2 Color) bool

eq checks if color c and c2 are equal in every channel

fn (Color) str #

fn (c Color) str() string

str returns a string representation of the Color c

fn (Color) rgba8 #

fn (c Color) rgba8() int

rgba8 converts a color value to an int in the RGBA8 order.
see https://developer.apple.com/documentation/coreimage/ciformat

fn (Color) bgra8 #

fn (c Color) bgra8() int

bgra8 converts a color value to an int in the BGRA8 order.
see https://developer.apple.com/documentation/coreimage/ciformat

fn (Color) abgr8 #

fn (c Color) abgr8() int

abgr8 converts a color value to an int in the ABGR8 order.
see https://developer.apple.com/documentation/coreimage/ciformat

fn (Color) to_css_string #

fn (c Color) to_css_string() string

to_css_string returns a CSS compatible string e.g. rgba(10,11,12,13) of the color c.

struct Image #

struct Image {
mut:
	obj voidptr
pub:
	id     int
	width  int
	height int
}

fn (Image) is_empty #

fn (i Image) is_empty() bool

is_empty returns true if the Image i is empty.

struct TextCfg #

struct TextCfg {
pub:
	color          Color = gx.black
	size           int   = 16
	align          HorizontalAlign = .left
	vertical_align VerticalAlign   = .top
	max_width      int
	family         string
	bold           bool
	mono           bool
	italic         bool
}

fn (TextCfg) to_css_string #

fn (cfg TextCfg) to_css_string() string

to_css_string returns a CSS compatible string of the TextCfg cfg.
For example: 'mono 14px serif'.