color.md

color

primitive/primitive/color.go

拿到颜色的数字集

Color-结构

type Color struct {
	R, G, B, A int
}

MakeColor

没有定义, 用图片自身的颜色, 返回 Color

	// main.go 使用
	var bg primitive.Color
		bg = primitive.MakeColor(primitive.AverageImageColor(input))
    

• AverageImageColor

返回, 图片的平局颜色

func MakeColor(c color.Color) Color {
	r, g, b, a := c.RGBA()
	return Color{int(r / 257), int(g / 257), int(b / 257), int(a / 257)}
}

MakeHexColor

用户定义了颜色, 返回 Color

    // determine background color
    flag.StringVar(&Background, "bg", "", "background color (hex)") // 是否 hex

	var bg primitive.Color
        bg = primitive.MakeHexColor(Background)
        // 比如 #4292f4
    

func MakeHexColor(x string) Color {
	x = strings.Trim(x, "#")
	var r, g, b, a int
	a = 255
	switch len(x) {
	case 3: // #fff
		fmt.Sscanf(x, "%1x%1x%1x", &r, &g, &b)
		r = (r << 4) | r
		g = (g << 4) | g
		b = (b << 4) | b
	case 4: // # 4个
		fmt.Sscanf(x, "%1x%1x%1x%1x", &r, &g, &b, &a)
		r = (r << 4) | r
		g = (g << 4) | g
		b = (b << 4) | b
		a = (a << 4) | a
	case 6: // # 6个
		fmt.Sscanf(x, "%02x%02x%02x", &r, &g, &b)
	case 8: // # 8个
		fmt.Sscanf(x, "%02x%02x%02x%02x", &r, &g, &b, &a)
	}
	return Color{r, g, b, a}
}

NRGBA

// model.go 使用
	model.Current = uniformRGBA(target.Bounds(), background.NRGBA())

func (c *Color) NRGBA() color.NRGBA {
	return color.NRGBA{uint8(c.R), uint8(c.G), uint8(c.B), uint8(c.A)}
}