Comprehensive color management, gradients, and color space support.
// RGB colors (values 0.0 to 1.0)
dc.SetRGB(1, 0, 0) // Red
dc.SetRGB(0, 1, 0) // Green
dc.SetRGB(0, 0, 1) // Blue
// RGBA with transparency
dc.SetRGBA(1, 0, 0, 0.5) // Semi-transparent red
// RGB with 0-255 values
dc.SetRGB255(255, 128, 0) // Orange
// Hex colors
dc.SetHexColor("#FF5733")
dc.SetHexColor("#F53") // Short form
// Named colors
dc.SetColor(color.RGBA{255, 0, 0, 255})
dc.SetColor(advancegg.ColorRed)
dc.SetColor(advancegg.ColorBlue)// Create colors
red := advancegg.RGB(1, 0, 0)
blue := advancegg.RGBA(0, 0, 1, 0.8)
orange := advancegg.RGB255(255, 165, 0)
purple := advancegg.HexColor("#8A2BE2")
// Color conversion
r, g, b, a := advancegg.ColorToRGBA(purple)
hex := advancegg.ColorToHex(red)
fmt.Printf("Hex: %s\n", hex) // #FF0000
// Color interpolation
interpolated := advancegg.InterpolateColor(red, blue, 0.5) // 50% between red and blue
// Random colors
randomColor := advancegg.RandomColor()
randomPastel := advancegg.RandomPastelColor()
randomBright := advancegg.RandomBrightColor()// Set HSV color
dc.SetHSV(240, 1, 1) // Blue: H=240°, S=100%, V=100%
dc.SetHSV(120, 0.5, 0.8) // Muted green
// Convert between RGB and HSV
h, s, v := advancegg.RGBToHSV(1, 0, 0) // Red to HSV
r, g, b := advancegg.HSVToRGB(h, s, v) // Back to RGB
// Create HSV color
hsvColor := advancegg.HSV(300, 0.8, 0.9) // Purple
dc.SetColor(hsvColor)// Set HSL color
dc.SetHSL(240, 1, 0.5) // Blue: H=240°, S=100%, L=50%
dc.SetHSL(0, 0.8, 0.6) // Light red
// Convert between RGB and HSL
h, s, l := advancegg.RGBToHSL(1, 0, 0) // Red to HSL
r, g, b := advancegg.HSLToRGB(h, s, l) // Back to RGB
// Create HSL color
hslColor := advancegg.HSL(180, 0.7, 0.4) // Dark cyan
dc.SetColor(hslColor)// Set CMYK color (for print)
dc.SetCMYK(0, 1, 1, 0) // Red: C=0%, M=100%, Y=100%, K=0%
dc.SetCMYK(1, 0, 1, 0) // Green
dc.SetCMYK(1, 1, 0, 0) // Blue
// Convert between RGB and CMYK
c, m, y, k := advancegg.RGBToCMYK(1, 0, 0) // Red to CMYK
r, g, b := advancegg.CMYKToRGB(c, m, y, k) // Back to RGB
// Create CMYK color
cmykColor := advancegg.CMYK(0.2, 0.8, 0.1, 0.05)
dc.SetColor(cmykColor)// Set LAB color
dc.SetLAB(50, 20, -30) // L=50, a=20, b=-30
// Convert between RGB and LAB
l, a, b := advancegg.RGBToLAB(1, 0, 0) // Red to LAB
r, g, b := advancegg.LABToRGB(l, a, b) // Back to RGB
// Create LAB color
labColor := advancegg.LAB(70, -10, 40)
dc.SetColor(labColor)
// Calculate color difference (Delta E)
deltaE := advancegg.CalculateDeltaE(color1, color2)
fmt.Printf("Color difference: %f\n", deltaE)// Create linear gradient
gradient := advancegg.NewLinearGradient(0, 0, 100, 0) // Horizontal
gradient.AddColorStop(0, color.RGBA{255, 0, 0, 255}) // Red at start
gradient.AddColorStop(0.5, color.RGBA{255, 255, 0, 255}) // Yellow at middle
gradient.AddColorStop(1, color.RGBA{0, 255, 0, 255}) // Green at end
// Use gradient as fill
dc.SetFillStyle(gradient)
dc.DrawRectangle(50, 50, 200, 100)
dc.Fill()
// Vertical gradient
verticalGradient := advancegg.NewLinearGradient(0, 0, 0, 100)
verticalGradient.AddColorStop(0, advancegg.RGB(0.2, 0.4, 0.8))
verticalGradient.AddColorStop(1, advancegg.RGB(0.8, 0.2, 0.4))
// Diagonal gradient
diagonalGradient := advancegg.NewLinearGradient(0, 0, 100, 100)// Create radial gradient
radial := advancegg.NewRadialGradient(50, 50, 0, 50, 50, 50)
radial.AddColorStop(0, color.RGBA{255, 255, 255, 255}) // White center
radial.AddColorStop(1, color.RGBA{0, 0, 0, 255}) // Black edge
dc.SetFillStyle(radial)
dc.DrawCircle(100, 100, 50)
dc.Fill()
// Offset radial gradient
offsetRadial := advancegg.NewRadialGradient(40, 40, 0, 50, 50, 50)
offsetRadial.AddColorStop(0, advancegg.RGBA(1, 1, 0, 1)) // Yellow center
offsetRadial.AddColorStop(1, advancegg.RGBA(1, 0, 0, 1)) // Red edge// Create conic (angular) gradient
conic := advancegg.NewConicGradient(100, 100, 0) // Center at (100,100), start at 0°
conic.AddColorStop(0, advancegg.RGB(1, 0, 0)) // Red
conic.AddColorStop(0.33, advancegg.RGB(0, 1, 0)) // Green
conic.AddColorStop(0.66, advancegg.RGB(0, 0, 1)) // Blue
conic.AddColorStop(1, advancegg.RGB(1, 0, 0)) // Back to red
dc.SetFillStyle(conic)
dc.DrawCircle(100, 100, 80)
dc.Fill()
// Conic gradient with custom start angle
conicAngled := advancegg.NewConicGradient(200, 200, math.Pi/4) // Start at 45°// Gradient with multiple color stops
rainbow := advancegg.NewLinearGradient(0, 0, 300, 0)
rainbow.AddColorStop(0, advancegg.RGB(1, 0, 0)) // Red
rainbow.AddColorStop(0.17, advancegg.RGB(1, 0.5, 0)) // Orange
rainbow.AddColorStop(0.33, advancegg.RGB(1, 1, 0)) // Yellow
rainbow.AddColorStop(0.5, advancegg.RGB(0, 1, 0)) // Green
rainbow.AddColorStop(0.67, advancegg.RGB(0, 0, 1)) // Blue
rainbow.AddColorStop(0.83, advancegg.RGB(0.3, 0, 0.5)) // Indigo
rainbow.AddColorStop(1, advancegg.RGB(0.5, 0, 1)) // Violet
// Gradient transformations
transformedGradient := gradient.Transform(matrix)
// Gradient with opacity
gradient.SetGlobalAlpha(0.7)
// Repeating gradients
repeatingGradient := advancegg.NewRepeatingLinearGradient(0, 0, 50, 0)
repeatingGradient.AddColorStop(0, advancegg.RGB(1, 0, 0))
repeatingGradient.AddColorStop(1, advancegg.RGB(0, 0, 1))// Material Design colors
materialRed := advancegg.MaterialRed500
materialBlue := advancegg.MaterialBlue500
materialGreen := advancegg.MaterialGreen500
// Web safe colors
webSafeColors := advancegg.GetWebSafeColors()
// CSS named colors
cssRed := advancegg.CSSColors["red"]
cssBlue := advancegg.CSSColors["blue"]
cssOrange := advancegg.CSSColors["orange"]
// Pantone colors (subset)
pantoneRed := advancegg.PantoneColors["18-1664"]
pantoneBlue := advancegg.PantoneColors["19-4052"]// Generate color harmonies
baseColor := advancegg.RGB(0.8, 0.2, 0.4)
// Complementary colors
complementary := advancegg.GetComplementaryColor(baseColor)
// Triadic colors
triadic := advancegg.GetTriadicColors(baseColor)
// Analogous colors
analogous := advancegg.GetAnalogousColors(baseColor, 5) // 5 colors
// Monochromatic colors
monochromatic := advancegg.GetMonochromaticColors(baseColor, 7) // 7 shades
// Split complementary
splitComplementary := advancegg.GetSplitComplementaryColors(baseColor)
// Tetradic (square) colors
tetradic := advancegg.GetTetradicColors(baseColor)// Create custom palette
palette := advancegg.NewColorPalette()
palette.AddColor("primary", advancegg.RGB(0.2, 0.4, 0.8))
palette.AddColor("secondary", advancegg.RGB(0.8, 0.2, 0.4))
palette.AddColor("accent", advancegg.RGB(1, 0.8, 0.2))
// Use palette colors
dc.SetColor(palette.GetColor("primary"))
// Generate palette from image
imagePalette := advancegg.ExtractPaletteFromImage(img, 8) // 8 dominant colors
// Save/load palettes
palette.SaveToFile("my-palette.json")
loadedPalette := advancegg.LoadPaletteFromFile("my-palette.json")
// Adobe Color (Kuler) format
adobePalette := advancegg.LoadAdobeColorPalette("palette.aco")// Lighten/darken colors
lighter := advancegg.LightenColor(baseColor, 0.2) // 20% lighter
darker := advancegg.DarkenColor(baseColor, 0.3) // 30% darker
// Saturate/desaturate
saturated := advancegg.SaturateColor(baseColor, 0.5) // More saturated
desaturated := advancegg.DesaturateColor(baseColor, 0.3) // Less saturated
// Adjust hue
hueShifted := advancegg.AdjustHue(baseColor, 60) // Shift hue by 60°
// Adjust brightness
brighter := advancegg.AdjustBrightness(baseColor, 1.2) // 20% brighter
dimmer := advancegg.AdjustBrightness(baseColor, 0.8) // 20% dimmer
// Adjust contrast
highContrast := advancegg.AdjustContrast(baseColor, 1.5) // Higher contrast
lowContrast := advancegg.AdjustContrast(baseColor, 0.7) // Lower contrast// Mix colors
red := advancegg.RGB(1, 0, 0)
blue := advancegg.RGB(0, 0, 1)
// Additive mixing (light)
additive := advancegg.MixColorsAdditive(red, blue)
// Subtractive mixing (paint)
subtractive := advancegg.MixColorsSubtractive(red, blue)
// Weighted mixing
weighted := advancegg.MixColorsWeighted(red, blue, 0.3) // 30% red, 70% blue
// Blend modes
multiply := advancegg.BlendColors(red, blue, advancegg.BlendModeMultiply)
screen := advancegg.BlendColors(red, blue, advancegg.BlendModeScreen)
overlay := advancegg.BlendColors(red, blue, advancegg.BlendModeOverlay)// Get color properties
luminance := advancegg.GetLuminance(color)
brightness := advancegg.GetBrightness(color)
contrast := advancegg.GetContrast(color1, color2)
// Check accessibility
wcagAA := advancegg.MeetsWCAGAA(textColor, backgroundColor)
wcagAAA := advancegg.MeetsWCAGAAA(textColor, backgroundColor)
// Color temperature
temperature := advancegg.GetColorTemperature(color) // In Kelvin
warmColor := advancegg.ColorFromTemperature(3000) // Warm white
coolColor := advancegg.ColorFromTemperature(6500) // Cool white
// Color distance
distance := advancegg.ColorDistance(color1, color2)
perceptualDistance := advancegg.PerceptualColorDistance(color1, color2)package main
import (
"math"
"github.com/GrandpaEJ/advancegg"
)
func main() {
dc := advancegg.NewContext(600, 600)
// Background
dc.SetRGB(0.1, 0.1, 0.1)
dc.Clear()
centerX, centerY := 300.0, 300.0
outerRadius := 250.0
innerRadius := 100.0
// Draw color wheel
segments := 360
for i := 0; i < segments; i++ {
angle1 := float64(i) * 2 * math.Pi / float64(segments)
angle2 := float64(i+1) * 2 * math.Pi / float64(segments)
// Calculate color based on angle
hue := float64(i) / float64(segments) * 360
color := advancegg.HSV(hue, 1, 1)
dc.SetColor(color)
// Draw segment
dc.MoveTo(centerX, centerY)
dc.Arc(centerX, centerY, outerRadius, angle1, angle2)
dc.ClosePath()
dc.Fill()
}
// Draw inner circle (white)
dc.SetRGB(1, 1, 1)
dc.DrawCircle(centerX, centerY, innerRadius)
dc.Fill()
// Add saturation gradient
for r := innerRadius; r < outerRadius; r += 2 {
saturation := (r - innerRadius) / (outerRadius - innerRadius)
for i := 0; i < segments; i++ {
angle := float64(i) * 2 * math.Pi / float64(segments)
hue := float64(i) / float64(segments) * 360
color := advancegg.HSV(hue, saturation, 1)
dc.SetColor(color)
x := centerX + r*math.Cos(angle)
y := centerY + r*math.Sin(angle)
dc.DrawCircle(x, y, 1)
dc.Fill()
}
}
dc.SavePNG("color-wheel.png")
}