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Sat Oct 4 23:33:09 1997 UTC (23 years ago) by monnier
File size: 2716 byte(s)
Sat Oct 4 23:33:09 1997 UTC (23 years ago) by monnier
File size: 2716 byte(s)
Initial revision
(* region-sig.sml * * COPYRIGHT (c) 1994 by AT&T Bell Laboratories * * Signature for regions. * *) signature REGION = sig structure G : GEOMETRY datatype fill_rule = EvenOdd | Winding datatype rect_overlap = RectangleOut | RectangleIn | RectanglePart type region (* Empty region *) val empty : region (* Returns list of rectangles composing the region. * The rectangles are YX banded. Specifically, the rectangles * are listed in non-decreasing y coordinates. Two rectangles * with the same y coordinate are listed in increasing x coordinate. * Additionally, if the y projections of any two rectangles overlap, * then the projections are equal. (The rectangles lie in non-overlapping * bands.) Within a band, the rectangles are non-contiguous. *) val rectsOf : region -> G.rect list (* Construct a region corresponding to the given rectangle. *) val rectangle : G.rect -> region (* Construct a region corresponding to the polygon described by * the list of points and the fill rule. *) val polygon : G.point list * fill_rule -> region (* Translate a region by the given vector. *) val offset : region * G.point -> region (* shrink (r,PT{x,y}) strips a band x pixels horizontally * and y pixels vertically from the boundary of r. If x or y are * negative, pixels are added rather than stripped in that dimension. *) val shrink : region * G.point -> region (* Return the smallest rectangle containing the region. *) val clipBox : region -> G.rect (* Return the region corresponding to the given set operation * applied to two argument regions. *) val intersect : region * region -> region val union : region * region -> region val subtract : region * region -> region val xor : region * region -> region (* True if the region is empty. *) val isEmpty : region -> bool (* True if the two regions are equal. *) val equal : region * region -> bool (* True if the two regions have non-empty intersection. *) val overlap : region * region -> bool (* True if the point lies within the region. *) val pointIn : region * G.point -> bool (* Returns RectangleIn if the rectangle is entirely contained * in the region. * returns RectangleOut if the rectangle is entirely outside * the region. * returns RectanglePart if the rectangle is partly in and partly * out of the region. *) val rectIn : region * G.rect -> rect_overlap end
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