PGGeometryTypes.h

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enum {
	PGNoEdges       = 0,
	PGMinXEdgeMask  = 1 << NSMinXEdge,
	PGMinYEdgeMask  = 1 << NSMinYEdge,
	PGMaxXEdgeMask  = 1 << NSMaxXEdge,
	PGMaxYEdgeMask  = 1 << NSMaxYEdge,
	PGHorzEdgesMask = PGMinXEdgeMask | PGMaxXEdgeMask,
	PGVertEdgesMask = PGMinYEdgeMask | PGMaxYEdgeMask,
	PGMinEdgesMask  = PGMinXEdgeMask | PGMinYEdgeMask,
	PGMaxEdgesMask  = PGMaxXEdgeMask | PGMaxYEdgeMask
};
typedef NSUInteger PGRectEdgeMask;

enum {
	PGReadingDirectionLeftToRight = 0,
	PGReadingDirectionRightToLeft = 1
};
typedef NSInteger PGReadingDirection;

enum {
	PGPreserveLocation = -1,
	PGHomeLocation = 0,
	PGEndLocation = 1,
	PGEndTopLocation = 2
};
typedef NSInteger PGPageLocation;

enum {
	PGUpright      = 0,
	PGFlippedVert  = 1 << 0,
	PGFlippedHorz  = 1 << 1,
	PGRotated90CCW  = 1 << 2, // Counter-Clockwise.
	PGUpsideDown   = PGFlippedVert | PGFlippedHorz,
	PGRotated90CW = PGFlippedVert | PGFlippedHorz | PGRotated90CCW
};
typedef NSUInteger PGOrientation;

typedef struct {
	CGFloat minX;
	CGFloat minY;
	CGFloat maxX;
	CGFloat maxY;
} PGInset;

enum {
	PGMinXMinYCorner = 0,
	PGMaxXMinYCorner = 1,
	PGMinXMaxYCorner = 2,
	PGMaxXMaxYCorner = 3
};
typedef NSUInteger PGRectCorner;