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40 lines
1.0 KiB
Nim
40 lines
1.0 KiB
Nim
import strutils
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type
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TColor = distinct int32
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proc rgb(r, g, b: range[0..255]): TColor =
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result = TColor(r or g shl 8 or b shl 16)
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proc `$`(c: TColor): string =
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result = "#" & toHex(int32(c), 6)
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echo rgb(34, 55, 255)
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when false:
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type
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TColor = distinct int32
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TColorComponent = distinct int8
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proc red(a: TColor): TColorComponent =
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result = TColorComponent(int32(a) and 0xff'i32)
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proc green(a: TColor): TColorComponent =
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result = TColorComponent(int32(a) shr 8'i32 and 0xff'i32)
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proc blue(a: TColor): TColorComponent =
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result = TColorComponent(int32(a) shr 16'i32 and 0xff'i32)
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proc rgb(r, g, b: range[0..255]): TColor =
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result = TColor(r or g shl 8 or b shl 8)
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proc `+!` (a, b: TColorComponent): TColorComponent =
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## saturated arithmetic:
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result = TColorComponent(min(ze(int8(a)) + ze(int8(b)), 255))
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proc `+` (a, b: TColor): TColor =
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## saturated arithmetic for colors makes sense, I think:
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return rgb(red(a) +! red(b), green(a) +! green(b), blue(a) +! blue(b))
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rgb(34, 55, 255)
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