92 lines
2.3 KiB
Lua
92 lines
2.3 KiB
Lua
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-- A basic color object.
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-- Colors can be created in 3 forms:
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-- color = Color('#ffffff')
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-- color = Color(255, 255, 255)
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-- color = Color(1, 1, 1)
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-- You can access the colors values via .r, .g, .b and .a.
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-- You can create a copy of a color by calling color:clone().
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Color = Object:extend()
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function Color:init(r, g, b, a)
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if type(r) == "string" then
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local hex = r:gsub("#", "")
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self.r = tonumber("0x" .. hex:sub(1, 2))/255
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self.g = tonumber("0x" .. hex:sub(3, 4))/255
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self.b = tonumber("0x" .. hex:sub(5, 6))/255
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self.a = 1
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else
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if r > 1 or g > 1 or b > 1 then
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self.r = r/255
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self.g = g/255
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self.b = b/255
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self.a = (a or 255)/255
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else
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self.r = r
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self.g = g
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self.b = b
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self.a = a or 1
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end
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end
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end
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function Color:clone()
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return Color(self.r, self.g, self.b, self.a)
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end
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function Color:lighten(v)
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local h, s, l = self:_to_hsl()
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l = l + v
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self.r, self.g, self.b = self:_to_rgb(h, s, l)
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return self
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end
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function Color:darken(v)
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local h, s, l = self:_to_hsl()
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l = l - v
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self.r, self.g, self.b = self:_to_rgb(h, s, l)
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return self
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end
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function Color:fade(v)
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self.a = self.a - v
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return self
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end
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function Color:_to_hsl()
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local max, min = math.max(self.r, self.g, self.b), math.min(self.r, self.g, self.b)
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local h, s, l
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l = (max + min)/2
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if max == min then h, s = 0, 0
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else
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local d = max - min
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if l > 0.5 then s = d/(2 - max - min) else s = d/(max + min) end
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if max == self.r then
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h = (self.g - self.b)/d
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if self.g < self.b then h = h + 6 end
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elseif max == self.g then h = (self.b - self.r)/d + 2
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elseif max == self.b then h = (self.r - self.g)/d + 4 end
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h = h/6
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end
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return h, s, l
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end
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function Color:_to_rgb(h, s, l)
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if s == 0 then return math.clamp(l, 0, 1), math.clamp(l, 0, 1), math.clamp(l, 0, 1) end
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local function to(p, q, t)
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if t < 0 then t = t + 1 end
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if t > 1 then t = t - 1 end
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if t < .16667 then return p + (q - p)*6*t end
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if t < .5 then return q end
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if t < .66667 then return p + (q - p)*(.66667 - t)*6 end
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return p
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end
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local q = l < .5 and l*(1 + s) or l + s - l*s
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local p = 2*l - q
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return math.clamp(to(p, q, h + .33334), 0, 1), math.clamp(to(p, q, h), 0, 1), math.clamp(to(p, q, h - .33334), 0, 1)
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end
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