using gfx::Color
** 256 ANSI colour palette. Palettes are provided for:
** - VGA
** - Windows XP
** - Mac OS X
** - PuTTY
** - Xterm
**
** All colours taken from [Wikipedia]`https://en.wikipedia.org/wiki/ANSI_escape_code#Colors`.
const class AnsiPalette {
private static Color[] paletteVga() {
Color[
Color.makeRgb( 0, 0, 0), // black
Color.makeRgb(170, 0, 0), // red
Color.makeRgb( 0, 170, 0), // green
Color.makeRgb(170, 85, 0), // brown/yellow
Color.makeRgb( 0, 0, 170), // blue
Color.makeRgb(170, 0, 170), // magenta
Color.makeRgb( 0, 170, 170), // cyan
Color.makeRgb(170, 170, 170), // grey
Color.makeRgb( 85, 85, 85), // dark grey
Color.makeRgb(255, 85, 85), // bright red
Color.makeRgb( 85, 255, 85), // bright green
Color.makeRgb(255, 255, 85), // yellow
Color.makeRgb( 85, 85, 255), // bright blue
Color.makeRgb(255, 85, 255), // bright magenta
Color.makeRgb( 85, 255, 255), // bright cyan
Color.makeRgb(255, 255, 255) // white
]
}
private static Color[] paletteXp() {
Color[
Color.makeRgb( 0, 0, 0), // black
Color.makeRgb(128, 0, 0), // red
Color.makeRgb( 0, 128, 0), // green
Color.makeRgb(128, 128, 0), // brown/yellow
Color.makeRgb( 0, 0, 128), // blue
Color.makeRgb(128, 0, 128), // magenta
Color.makeRgb( 0, 128, 128), // cyan
Color.makeRgb(192, 192, 192), // grey
Color.makeRgb(128, 128, 128), // dark grey
Color.makeRgb(255, 0, 0), // bright red
Color.makeRgb( 0, 255, 0), // bright green
Color.makeRgb(255, 255, 0), // yellow
Color.makeRgb( 0, 0, 255), // bright blue
Color.makeRgb(255, 0, 255), // bright magenta
Color.makeRgb( 0, 255, 255), // bright cyan
Color.makeRgb(255, 255, 255) // white
]
}
private static Color[] paletteMac() {
Color[
Color.makeRgb( 0, 0, 0), // black
Color.makeRgb(194, 54, 33), // red
Color.makeRgb( 37, 188, 36), // green
Color.makeRgb(173, 173, 39), // brown/yellow
Color.makeRgb( 73, 46, 225), // blue
Color.makeRgb(211, 56, 211), // magenta
Color.makeRgb( 51, 187, 200), // cyan
Color.makeRgb(203, 204, 205), // grey
Color.makeRgb(129, 131, 131), // dark grey
Color.makeRgb(252, 57, 31), // bright red
Color.makeRgb( 49, 231, 34), // bright green
Color.makeRgb(234, 236, 35), // yellow
Color.makeRgb( 88, 51, 255), // bright blue
Color.makeRgb(249, 53, 248), // bright magenta
Color.makeRgb( 20, 240, 240), // bright cyan
Color.makeRgb(233, 235, 235) // white
]
}
private static Color[] palettePutty() {
Color?[
Color.makeRgb( 0, 0, 0), // black
Color.makeRgb(187, 0, 0), // red
Color.makeRgb( 0, 187, 0), // green
Color.makeRgb(187, 187, 0), // brown/yellow
Color.makeRgb( 0, 0, 187), // blue
Color.makeRgb(187, 0, 187), // magenta
Color.makeRgb( 0, 187, 187), // cyan
Color.makeRgb(187, 187, 187), // grey
Color.makeRgb( 85, 85, 85), // dark grey
Color.makeRgb(255, 85, 85), // bright red
Color.makeRgb( 85, 255, 85), // bright green
Color.makeRgb(255, 255, 85), // yellow
Color.makeRgb( 85, 85, 255), // bright blue
Color.makeRgb(255, 85, 255), // bright magenta
Color.makeRgb( 85, 255, 255), // bright cyan
Color.makeRgb(255, 255, 255) // white
]
}
private static Color[] paletteXterm() {
Color[
Color.makeRgb( 0, 0, 0), // black
Color.makeRgb(205, 0, 0), // red
Color.makeRgb( 0, 205, 0), // green
Color.makeRgb(205, 205, 0), // brown/yellow
Color.makeRgb( 0, 0, 238), // blue
Color.makeRgb(205, 0, 205), // magenta
Color.makeRgb( 0, 205, 205), // cyan
Color.makeRgb(229, 229, 229), // grey
Color.makeRgb(127, 127, 127), // dark grey
Color.makeRgb(255, 0, 0), // bright red
Color.makeRgb( 0, 255, 0), // bright green
Color.makeRgb(255, 255, 0), // yellow
Color.makeRgb( 92, 92, 255), // bright blue
Color.makeRgb(255, 0, 255), // bright magenta
Color.makeRgb( 0, 255, 255), // bright cyan
Color.makeRgb(255, 255, 255) // white
]
}
private const Color?[] palette
** Selects the palette according to your OS:
** - XP for Windows,
** - Mac for sad people,
** - XTerm for everyone else.
static new make() {
if (Env.cur.os == "win32")
return AnsiPalette(paletteXp)
if (Env.cur.os == "macosx")
return AnsiPalette(paletteMac)
return AnsiPalette(paletteXterm)
}
** Creates a standard VGA palette.
static AnsiPalette vga() {
AnsiPalette(paletteVga)
}
** Creates an XP CMD prompt palette.
static AnsiPalette xp() {
AnsiPalette(paletteXp)
}
** Creates a Mac Terminal palette.
static AnsiPalette mac() {
AnsiPalette(paletteMac)
}
** Creates a Putty palette.
static AnsiPalette putty() {
AnsiPalette(palettePutty)
}
** Creates an XTerm palette.
static AnsiPalette xterm() {
AnsiPalette(paletteXterm)
}
private static const Int[] _safeVals := [0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF]
private new makeWithPalette(Color[] palette) {
if (palette.size < 16)
throw ArgErr("Palette size too small: ${palette.size}")
// echo("----")
palette = palette.rw
palette.capacity = 256
// 6x6x6 color matrix
(16..231).each |i| {
color := i - 16
blue := _safeVals[color % 6]
color = color / 6
green := _safeVals[color % 6]
color = color / 6
red := _safeVals[color % 6]
// echo("$i - ${Color.makeRgb(red, green, blue)}".upper)
palette.add(Color.makeRgb(red, green, blue))
}
// echo("----")
// greyscale
(232..255).each |i| {
// add the 5 offset so the min is #555555 and the max is #FAFAFA
// user can then use std black and white to give a 26 colour greyscale
grey := ((i - 232) * 256 / 24) + 5
// echo("$i - ${Color.makeRgb(grey, grey, grey)}".upper)
palette.add(Color.makeRgb(grey, grey, grey))
}
this.palette = palette
}
** Gets the colour associated with the given index.
** 'index' should be in the range of 0..255
@Operator
Color get(Int index) {
palette[index]
}
** Converts the given colour to its nearest in the palette.
Color safe(Color col) {
err := |Color c1, Color c2 -> Int| { safeErr(c1, col) <=> safeErr(c2, col) }
std := (0..15).toList.map { palette[it] }.min(err)
cube := Color.makeRgb(safeVal(col.r), safeVal(col.g), safeVal(col.b))
grey := (232..255).toList.map { palette[it] }.min(err)
return [std, cube, grey].min(err)
}
** Returns the palette index of the given colour.
** Note the colour is first converted to a *safe* colour to ensure this method
** always returns a value.
Int index(Color colour) {
palette.index(safe(colour))
}
private Int safeErr(Color c1, Color c2) {
(c1.r - c2.r).abs + (c1.g - c2.g).abs + (c1.b - c2.b).abs
}
private Int safeVal(Int v) {
_safeVals.min |p1, p2| { (p1 - v).abs <=> (p2 - v).abs }
}
}
