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88 lines
2.2 KiB
Nim
88 lines
2.2 KiB
Nim
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# bug #4626
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var foo: (int, array[1, int]) # Tuple must be of length > 1
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let bar = (1, [1])
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foo = bar # No error if assigned directly
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# bug #2250
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import
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math, strutils
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type
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Meters = float
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Point2[T] = tuple[x, y: T]
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HexState* = enum
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hsOn, hsOff
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Index = uint16
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HexGrid* = object
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w, h: int ## Width and height of the hex grid.
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radius: Meters ## Radius of circle that circumscribes a hexagon.
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grid: seq[HexState] ## Information on what hexes are drawn.
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HexVtxIndex = enum
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hiA, hiB, hiC, hiD, hiE, hiF
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HexCoord* = Point2[int]
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const
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HexDY = sqrt(1.0 - (0.5 * 0.5)) # dy from center to midpoint of 1-2
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HexDX = sqrt(1.0 - (HexDY * HexDY)) # dx from center to midpoint of 1-5 (0.5)
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let
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hexOffsets : array[HexVtxIndex, Point2[float]] = [
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(-1.0, 0.0),
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(-HexDX, -HexDY),
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(HexDX, -HexDY),
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(1.0, 0.0),
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(HexDX, HexDY),
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(-HexDX, HexDY)]
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evenSharingOffsets : array[HexVtxIndex, tuple[hc: HexCoord; idx: HexVtxIndex]] = [
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((0,0), hiA),
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((0,0), hiB),
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((1,-1), hiA),
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((1,0), hiB),
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((1,0), hiA),
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((0,1), hiB)]
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oddSharingOffsets : array[HexVtxIndex, tuple[hc: HexCoord; idx: HexVtxIndex]] = [
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((0,0), hiA),
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((0,0), hiB),
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((1,0), hiA),
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((1,1), hiB),
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((1,1), hiA),
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((0,1), hiB)]
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template odd*(i: int) : untyped =
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(i and 1) != 0
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proc vidx(hg: HexGrid; col, row: int; i: HexVtxIndex) : Index =
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#NOTE: this variation compiles
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#var offset : type(evenSharingOffsets[i])
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#
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#if odd(col):
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# offset = oddSharingOffsets[i]
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#else:
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# offset = evenSharingOffsets[i]
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let
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#NOTE: this line generates the bad code
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offset = (if odd(col): oddSharingOffsets[i] else: evenSharingOffsets[i])
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x = col + 1 + offset.hc.x
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y = row + 1 + offset.hc.y
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result = Index(x*2 + y * (hg.w + 2)*2 + int(offset.idx))
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proc go() =
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var hg : HexGrid
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echo "vidx ", $vidx(hg, 1, 2, hiC)
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go()
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