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92 lines
1.8 KiB
92 lines
1.8 KiB
-- Experimental helpers for skia --
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function string.startsWith(String,Start)
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return string.sub(String,1,string.len(Start))==Start
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end
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function string.endsWith(String,End)
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return End=='' or string.sub(String,-string.len(End))==End
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end
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Sk = {}
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function Sk.isFinite(x)
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return x * 0 == 0
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end
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-------------------------------------------------------------------------------
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Sk.Rect = { left = 0, top = 0, right = 0, bottom = 0 }
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Sk.Rect.__index = Sk.Rect
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function Sk.Rect.new(l, t, r, b)
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local rect
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if r then
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-- 4 arguments
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rect = { left = l, top = t, right = r, bottom = b }
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elseif l then
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-- 2 arguments
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rect = { right = l, bottom = t }
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else
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-- 0 arguments
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rect = {}
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end
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setmetatable(rect, Sk.Rect)
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return rect;
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end
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function Sk.Rect:width()
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return self.right - self.left
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end
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function Sk.Rect:height()
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return self.bottom - self.top
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end
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function Sk.Rect:isEmpty()
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return self:width() <= 0 or self:height() <= 0
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end
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function Sk.Rect:isFinite()
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local value = self.left * 0
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value = value * self.top
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value = value * self.right
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value = value * self.bottom
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return 0 == value
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end
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function Sk.Rect:setEmpty()
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self.left = 0
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self.top = 0
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self.right = 0
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self.bottom = 0
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end
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function Sk.Rect:set(l, t, r, b)
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self.left = l
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self.top = t
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self.right = r
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self.bottom = b
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end
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function Sk.Rect:offset(dx, dy)
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dy = dy or dx
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self.left = self.left + dx
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self.top = self.top + dy
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self.right = self.right + dx
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self.bottom = self.bottom + dy
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end
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function Sk.Rect:inset(dx, dy)
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dy = dy or dx
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self.left = self.left + dx
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self.top = self.top + dy
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self.right = self.right - dx
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self.bottom = self.bottom - dy
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end
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-------------------------------------------------------------------------------
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