84 lines
1.9 KiB
Lua
84 lines
1.9 KiB
Lua
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local function set(self, r, c, v)
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if r < self.top or r > self.bottom or c < self.left or c > self.right then
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error(string.format("index (%d %d) out of bounds (%d..%d %d..%d)",
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r, c, self.top, self.bottom, self.left, self.right))
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end
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self.grid[r * self.width + c] = v
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end
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local function get(self, r, c)
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if r < self.top or r > self.bottom or c < self.left or c > self.right then
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if self.default then
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return self.default
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else
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error(string.format("index (%d %d) out of bounds (%d..%d %d..%d)",
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r, c, self.top, self.bottom, self.left, self.right))
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end
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end
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local item = self.grid[r * self.width + c]
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if item == nil and self.default then
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return self.default
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else
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return item
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end
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end
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local function iter(self, r, c, h, w)
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if r == nil then r = self.top end
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if c == nil then c = self.left end
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if h == nil then h = self.height end
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if w == nil then w = self.width end
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local r0, c0 = r, c
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return function()
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if r0 > r + h - 1 then return nil end
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local rb, cb = r0, c0
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c0 = c0 + 1
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if c0 > c + w - 1 then
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c0 = c
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r0 = r0 + 1
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end
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return self:get(rb, cb), rb, cb
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end
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end
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local function neigh9(self, r, c, exclude)
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local iter = self:iter(r - 1, c - 1, 3, 3)
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return function()
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local i, ri, ci = iter()
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if exclude and ri == r and ci == c then
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local i, ri, ci = iter()
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end
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return i, ri, ci
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end
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end
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local function write(self, format)
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if not format then format = function(i)
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return string.format("%3s", i)
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end end
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for r = self.top, self.bottom do
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for c = self.left, self.right do
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io.write(format(self:get(r, c)))
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end
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io.write("\n")
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end
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end
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function grid(top, left, width, height, default)
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return {
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top = top,
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left = left,
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height = height,
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width = width,
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bottom = top + height - 1,
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right = left + width - 1,
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default = default,
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grid = {},
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get = get,
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set = set,
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iter = iter,
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neigh9 = neigh9,
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write = write,
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}
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end
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