67 lines
1.1 KiB
Go
67 lines
1.1 KiB
Go
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package color
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"strings"
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)
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type RGB struct {
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Red int
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Green int
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Blue int
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}
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func MustParseHex(hexColor string) *RGB {
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c, err := ParseHex(hexColor)
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if err != nil {
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panic(err)
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}
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return c
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}
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func ParseHex(hexColor string) (*RGB, error) {
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hexColor = strings.TrimPrefix(hexColor, "#")
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// Convert to individual parts
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var rh, gh, bh string
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switch len(hexColor) {
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case 3:
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rh, gh, bh = hexColor[:1]+hexColor[:1], hexColor[1:2]+hexColor[1:2], hexColor[2:3]+hexColor[2:3]
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case 6:
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rh, gh, bh = hexColor[0:2], hexColor[2:4], hexColor[4:6]
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default:
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return nil, errors.New("invalid hex string")
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}
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// Convert to bytes
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rb, err := hex.DecodeString(rh)
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if err != nil {
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return nil, err
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}
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gb, err := hex.DecodeString(gh)
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if err != nil {
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return nil, err
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}
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bb, err := hex.DecodeString(bh)
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if err != nil {
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return nil, err
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}
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return &RGB{
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Red: int(rb[0]),
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Green: int(gb[0]),
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Blue: int(bb[0]),
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}, nil
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}
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// String returns an r;g;b representation of an RGB
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func (r *RGB) String() string {
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return r.format()
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}
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func (r *RGB) format() string {
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return fmt.Sprintf("%d;%d;%d", r.Red, r.Green, r.Blue)
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}
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