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47 lines
1.3 KiB
47 lines
1.3 KiB
3 years ago
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package state
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import "fmt"
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// Color is an internal representation of a hexadecimal color string.
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// It can take one of these formats:
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// #RRGGBBAA
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// #RRGGBB
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// #RGBA
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// #RGB
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// When marshaling, it will always choose the most efficient format, but any format can be used when unmarshaling.
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type Color struct {
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// R is the red component of the color.
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R uint8
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// G is the green component of the color.
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G uint8
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// B is the blue component of the color.
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B uint8
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// A is the alpha component of the color.
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A uint8
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}
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// String prints the Color as an abbreviated notation.
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// Specifically, short form is used when possible (i.e., when all components are evenly divisible by 0x11).
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// The alpha component is left out if it's 0xFF.
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func (c Color) String() string {
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if c.R%0x11 == 0 && c.G%0x11 == 0 && c.B%0x11 == 0 && c.A%0x11 == 0 {
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// Short form works.
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if c.A == 0xFF {
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// It's great when it's easy!
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return fmt.Sprintf("#%01X%01X%01X", c.R/0x11, c.G/0x11, c.B/0x11)
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} else {
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// Just need to add the alpha.
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return fmt.Sprintf("#%01X%01X%01X%01X", c.R/0x11, c.G/0x11, c.B/0x11, c.A/0x11)
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}
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} else {
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// Gotta use long form.
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if c.A == 0xFF {
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// Can skip the alpha channel, though.
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return fmt.Sprintf("#%02X%02X%02X", c.R, c.G, c.B)
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} else {
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// Doing things the hard way.
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return fmt.Sprintf("#%02X%02X%02X%02X", c.R, c.G, c.B, c.A)
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}
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}
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}
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