g3n-engine/math32/color.go

// Copyright 2016 The G3N Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math32

import ()

type Color struct {
	R float32
	G float32
	B float32
}

var Black = Color{0, 0, 0}
var White = Color{1, 1, 1}
var Red = Color{1, 0, 0}
var Green = Color{0, 1, 0}
var Blue = Color{0, 0, 1}
var Gray = Color{0.5, 0.5, 0.5}

// NewColor creates and returns a pointer to a new color
// with the specified RGB components
func NewColor(r, g, b float32) *Color {

	return &Color{R: r, G: g, B: b}
}

// NewColorHex creates and returns a pointer to a new color
// with its RGB components from the specified hex value
func NewColorHex(color uint) *Color {

	return (&Color{}).SetHex(color)
}

// Set sets this color individual R,G,B components
func (c *Color) Set(r, g, b float32) *Color {

	c.R = r
	c.G = g
	c.B = b
	return c
}

// SetHex sets the color RGB components from the
// specified integer interpreted as a color hex number
func (c *Color) SetHex(value uint) *Color {

	c.R = float32((value >> 16 & 255)) / 255
	c.G = float32((value >> 8 & 255)) / 255
	c.B = float32((value & 255)) / 255
	return c
}

// SetName sets the color RGB components from the
// specified HTML color name
func (c *Color) SetName(name string) *Color {

	return c.SetHex(colorKeywords[name])
}

func (c *Color) Add(other *Color) *Color {

	c.R += other.R
	c.G += other.G
	c.B += other.B
	return c
}

func (c *Color) AddColors(color1, color2 *Color) *Color {

	c.R = color1.R + color2.R
	c.G = color1.G + color2.G
	c.B = color1.B + color2.B
	return c
}

func (c *Color) AddScalar(s float32) *Color {

	c.R += s
	c.G += s
	c.B += s
	return c
}

func (c *Color) Multiply(other *Color) *Color {

	c.R *= other.R
	c.G *= other.G
	c.B *= other.B
	return c
}

func (c *Color) MultiplyScalar(v float32) *Color {

	c.R *= v
	c.G *= v
	c.B *= v
	return c
}

func (c *Color) Lerp(color *Color, alpha float32) *Color {

	c.R += (color.R - c.R) * alpha
	c.G += (color.G - c.G) * alpha
	c.B += (color.B - c.B) * alpha
	return c
}

func (c *Color) Equals(other *Color) bool {

	return (c.R == other.R) && (c.G == other.G) && (c.B == other.B)
}

func (c *Color) Clone() *Color {

	return NewColor(c.R, c.G, c.B)
}

var colorKeywords = map[string]uint{
	"aliceblue":            0xF0F8FF,
	"antiquewhite":         0xFAEBD7,
	"aqua":                 0x00FFFF,
	"aquamarine":           0x7FFFD4,
	"azure":                0xF0FFFF,
	"beige":                0xF5F5DC,
	"bisque":               0xFFE4C4,
	"black":                0x000000,
	"blanchedalmond":       0xFFEBCD,
	"blue":                 0x0000FF,
	"blueviolet":           0x8A2BE2,
	"brown":                0xA52A2A,
	"burlywood":            0xDEB887,
	"cadetblue":            0x5F9EA0,
	"chartreuse":           0x7FFF00,
	"chocolate":            0xD2691E,
	"coral":                0xFF7F50,
	"cornflowerblue":       0x6495ED,
	"cornsilk":             0xFFF8DC,
	"crimson":              0xDC143C,
	"cyan":                 0x00FFFF,
	"darkblue":             0x00008B,
	"darkcyan":             0x008B8B,
	"darkgoldenrod":        0xB8860B,
	"darkgray":             0xA9A9A9,
	"darkgreen":            0x006400,
	"darkgrey":             0xA9A9A9,
	"darkkhaki":            0xBDB76B,
	"darkmagenta":          0x8B008B,
	"darkolivegreen":       0x556B2F,
	"darkorange":           0xFF8C00,
	"darkorchid":           0x9932CC,
	"darkred":              0x8B0000,
	"darksalmon":           0xE9967A,
	"darkseagreen":         0x8FBC8F,
	"darkslateblue":        0x483D8B,
	"darkslategray":        0x2F4F4F,
	"darkslategrey":        0x2F4F4F,
	"darkturquoise":        0x00CED1,
	"darkviolet":           0x9400D3,
	"deeppink":             0xFF1493,
	"deepskyblue":          0x00BFFF,
	"dimgray":              0x696969,
	"dimgrey":              0x696969,
	"dodgerblue":           0x1E90FF,
	"firebrick":            0xB22222,
	"floralwhite":          0xFFFAF0,
	"forestgreen":          0x228B22,
	"fuchsia":              0xFF00FF,
	"gainsboro":            0xDCDCDC,
	"ghostwhite":           0xF8F8FF,
	"gold":                 0xFFD700,
	"goldenrod":            0xDAA520,
	"gray":                 0x808080,
	"green":                0x008000,
	"greenyellow":          0xADFF2F,
	"grey":                 0x808080,
	"honeydew":             0xF0FFF0,
	"hotpink":              0xFF69B4,
	"indianred":            0xCD5C5C,
	"indigo":               0x4B0082,
	"ivory":                0xFFFFF0,
	"khaki":                0xF0E68C,
	"lavender":             0xE6E6FA,
	"lavenderblush":        0xFFF0F5,
	"lawngreen":            0x7CFC00,
	"lemonchiffon":         0xFFFACD,
	"lightblue":            0xADD8E6,
	"lightcoral":           0xF08080,
	"lightcyan":            0xE0FFFF,
	"lightgoldenrodyellow": 0xFAFAD2,
	"lightgray":            0xD3D3D3,
	"lightgreen":           0x90EE90,
	"lightgrey":            0xD3D3D3,
	"lightpink":            0xFFB6C1,
	"lightsalmon":          0xFFA07A,
	"lightseagreen":        0x20B2AA,
	"lightskyblue":         0x87CEFA,
	"lightslategray":       0x778899,
	"lightslategrey":       0x778899,
	"lightsteelblue":       0xB0C4DE,
	"lightyellow":          0xFFFFE0,
	"lime":                 0x00FF00,
	"limegreen":            0x32CD32,
	"linen":                0xFAF0E6,
	"magenta":              0xFF00FF,
	"maroon":               0x800000,
	"mediumaquamarine":     0x66CDAA,
	"mediumblue":           0x0000CD,
	"mediumorchid":         0xBA55D3,
	"mediumpurple":         0x9370DB,
	"mediumseagreen":       0x3CB371,
	"mediumslateblue":      0x7B68EE,
	"mediumspringgreen":    0x00FA9A,
	"mediumturquoise":      0x48D1CC,
	"mediumvioletred":      0xC71585,
	"midnightblue":         0x191970,
	"mintcream":            0xF5FFFA,
	"mistyrose":            0xFFE4E1,
	"moccasin":             0xFFE4B5,
	"navajowhite":          0xFFDEAD,
	"navy":                 0x000080,
	"oldlace":              0xFDF5E6,
	"olive":                0x808000,
	"olivedrab":            0x6B8E23,
	"orange":               0xFFA500,
	"orangered":            0xFF4500,
	"orchid":               0xDA70D6,
	"palegoldenrod":        0xEEE8AA,
	"palegreen":            0x98FB98,
	"paleturquoise":        0xAFEEEE,
	"palevioletred":        0xDB7093,
	"papayawhip":           0xFFEFD5,
	"peachpuff":            0xFFDAB9,
	"peru":                 0xCD853F,
	"pink":                 0xFFC0CB,
	"plum":                 0xDDA0DD,
	"powderblue":           0xB0E0E6,
	"purple":               0x800080,
	"red":                  0xFF0000,
	"rosybrown":            0xBC8F8F,
	"royalblue":            0x4169E1,
	"saddlebrown":          0x8B4513,
	"salmon":               0xFA8072,
	"sandybrown":           0xF4A460,
	"seagreen":             0x2E8B57,
	"seashell":             0xFFF5EE,
	"sienna":               0xA0522D,
	"silver":               0xC0C0C0,
	"skyblue":              0x87CEEB,
	"slateblue":            0x6A5ACD,
	"slategrey":            0x708090,
	"snow":                 0xFFFAFA,
	"springgreen":          0x00FF7F,
	"steelblue":            0x4682B4,
	"tan":                  0xD2B48C,
	"teal":                 0x008080,
	"thistle":              0xD8BFD8,
	"tomato":               0xFF6347,
	"turquoise":            0x40E0D0,
	"violet":               0xEE82EE,
	"wheat":                0xF5DEB3,
	"white":                0xFFFFFF,
	"whitesmoke":           0xF5F5F5,
	"yellow":               0xFFFF00,
	"yellowgreen":          0x9ACD32,
}