Golang : Create new color from command line parameters
Problem:
You want to create a new color base on given RGBA parameters/arguments from command line. How to do that?
Solution:
Create a new color variable with image/color
package. Set the RGBA values with {}
, such as:
color1 := color.RGBA{uint8(red1), uint8(green1), uint8(blue1), uint8(alpha1)}
Here you go!
createnewcolor.go
package main
import (
"fmt"
"image/color"
"os"
"strconv"
)
func main() {
if len(os.Args) != 9 {
fmt.Printf("Usage : %s <red1> <green1> <blue1> <alpha1> <red2> <green2> <blue2> <alpha1> \n", os.Args[0])
os.Exit(0)
}
//sanity checks
red1int, _ := strconv.Atoi(os.Args[1])
red1 := uint8(red1int)
green1int, _ := strconv.Atoi(os.Args[2])
green1 := uint8(green1int)
blue1int, _ := strconv.Atoi(os.Args[3])
blue1 := uint8(blue1int)
alpha1int, _ := strconv.Atoi(os.Args[4])
alpha1 := uint8(alpha1int)
red2int, _ := strconv.Atoi(os.Args[5])
red2 := uint8(red2int)
green2int, _ := strconv.Atoi(os.Args[6])
green2 := uint8(green2int)
blue2int, _ := strconv.Atoi(os.Args[7])
blue2 := uint8(blue2int)
alpha2int, _ := strconv.Atoi(os.Args[8])
alpha2 := uint8(alpha2int)
fmt.Println("Red 1 : ", red1)
fmt.Println("Green 1 : ", green1)
fmt.Println("Blue 1 : ", blue1)
fmt.Println("Alpha 1 : ", alpha1)
fmt.Println("Red 2 : ", red2)
fmt.Println("Green 2 : ", green2)
fmt.Println("Blue 2 : ", blue2)
fmt.Println("Alpha 2 : ", alpha2)
// create new colors from given arguments/command line parameters
color1 := color.RGBA{uint8(red1), uint8(green1), uint8(blue1), uint8(alpha1)}
color2 := color.RGBA{uint8(red2), uint8(green2), uint8(blue2), uint8(alpha2)}
fmt.Println("Color 1 = ", color1) // white
fmt.Println("Color 2 = ", color2) // black
}
Output:
./createnewcolor 0 0 0 0 0 0 255 0
Red 1 : 0
Green 1 : 0
Blue 1 : 0
Alpha 1 : 0
Red 2 : 0
Green 2 : 0
Blue 2 : 255
Alpha 2 : 0
Color 1 = {0 0 0 0}
Color 2 = {0 0 255 0}
Happy coloring!
Reference:
By Adam Ng
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