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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #ifndef _SV_REGBAND_HXX
21 : #define _SV_REGBAND_HXX
22 :
23 : #include <tools/solar.h>
24 : #include <tools/poly.hxx>
25 :
26 : /* =======================================================================
27 :
28 : class ImplRegionBand
29 :
30 : This class handles one y-band of the region. In this band may contain one
31 : or more seprarations in x-direction. The y-Band do not contain any
32 : separation after creation.
33 :
34 : The separations are modified with basic clipping functions like Union and
35 : Intersection - the Class will process the clipping for the actual band.
36 :
37 : The actual separations may be checked by functions like IsInside or
38 : IsOver.
39 :
40 : ======================================================================= */
41 :
42 : // ------------------------
43 : // - ImplRegionBand-Types -
44 : // ------------------------
45 :
46 : // element for the list with x-separations
47 : struct ImplRegionBandSep
48 : {
49 : ImplRegionBandSep* mpNextSep;
50 : long mnXLeft;
51 : long mnXRight;
52 : sal_Bool mbRemoved;
53 : };
54 :
55 : enum LineType { LINE_ASCENDING, LINE_DESCENDING, LINE_HORIZONTAL };
56 :
57 : // element for the list with x-separations
58 : struct ImplRegionBandPoint
59 : {
60 : ImplRegionBandPoint* mpNextBandPoint;
61 : long mnX;
62 : long mnLineId;
63 : sal_Bool mbEndPoint;
64 : LineType meLineType;
65 : };
66 :
67 : // ------------------
68 : // - ImplRegionBand -
69 : // ------------------
70 :
71 : class ImplRegionBand
72 : {
73 : public:
74 : ImplRegionBand* mpNextBand; // pointer to the next element of the list
75 : ImplRegionBand* mpPrevBand; // pointer to the previous element of the list (only used temporaery)
76 : ImplRegionBandSep* mpFirstSep; // root of the list with x-separations
77 : ImplRegionBandPoint* mpFirstBandPoint; // root of the list with lines
78 : long mnYTop; // actual boundary of the band
79 : long mnYBottom;
80 : sal_Bool mbTouched;
81 :
82 : // create y-band with boundaries
83 : ImplRegionBand( long nYTop, long nYBottom );
84 : /** copy y-band with with all data
85 : @param theSourceBand
86 : The new ImplRegionBand object will
87 : be a copy of this band.
88 : @param bIgnorePoints
89 : When <TRUE/> (the default) the
90 : band points pointed to by
91 : mpFirstBandPoint are not copied.
92 : When <FALSE/> they are copied.
93 : You need the points when you are
94 : planning to call ProcessPoints()
95 : later on.
96 : */
97 : ImplRegionBand( const ImplRegionBand & theSourceBand,
98 : const bool bIgnorePoints = true);
99 : ~ImplRegionBand();
100 :
101 : long GetXLeftBoundary() const;
102 : long GetXRightBoundary() const;
103 :
104 : // combine overlapping bands
105 : sal_Bool OptimizeBand();
106 :
107 : // generate separations from lines and process
108 : // union with existing separations
109 : void ProcessPoints();
110 : // insert point in the list for later processing
111 : sal_Bool InsertPoint( long nX, long nLineID,
112 : sal_Bool bEndPoint, LineType eLineType );
113 :
114 : void Union( long nXLeft, long nXRight );
115 : void Intersect( long nXLeft, long nXRight );
116 : void Exclude( long nXLeft, long nXRight );
117 : void XOr( long nXLeft, long nXRight );
118 :
119 : void MoveX( long nHorzMove );
120 : void ScaleX( double fHorzScale );
121 :
122 : sal_Bool IsInside( long nX );
123 :
124 135853 : sal_Bool IsEmpty() const { return ((!mpFirstSep) && (!mpFirstBandPoint)); }
125 :
126 : sal_Bool operator==( const ImplRegionBand& rRegionBand ) const;
127 :
128 : /** Split the called band at the given vertical coordinate. After the
129 : split the called band will cover the upper part not including nY.
130 : The new band will cover the lower part including nY.
131 : @param nY
132 : The band is split at this y coordinate. The new, lower band
133 : will include this very value.
134 : @return
135 : Returns the new, lower band.
136 : */
137 : ImplRegionBand* SplitBand (const sal_Int32 nY);
138 : };
139 :
140 : #endif // _SV_REGBAND_HXX
141 :
142 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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