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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 INCLUDED_VCL_INC_REGBAND_HXX
21 : #define INCLUDED_VCL_INC_REGBAND_HXX
22 :
23 : #include <tools/poly.hxx>
24 :
25 : /*
26 :
27 : class ImplRegionBand
28 :
29 : This class handles one y-band of the region. In this band may contain one
30 : or more seprarations in x-direction. The y-Band do not contain any
31 : separation after creation.
32 :
33 : The separations are modified with basic clipping functions like Union and
34 : Intersection - the Class will process the clipping for the actual band.
35 :
36 : */
37 :
38 : // element for the list with x-separations
39 : struct ImplRegionBandSep
40 : {
41 : ImplRegionBandSep* mpNextSep;
42 : long mnXLeft;
43 : long mnXRight;
44 : bool mbRemoved;
45 : };
46 :
47 : enum LineType { LINE_ASCENDING, LINE_DESCENDING, LINE_HORIZONTAL };
48 :
49 : // element for the list with x-separations
50 : struct ImplRegionBandPoint
51 : {
52 : ImplRegionBandPoint* mpNextBandPoint;
53 : long mnX;
54 : long mnLineId;
55 : bool mbEndPoint;
56 : LineType meLineType;
57 : };
58 :
59 : class ImplRegionBand
60 : {
61 : public:
62 : ImplRegionBand* mpNextBand; // pointer to the next element of the list
63 : ImplRegionBand* mpPrevBand; // pointer to the previous element of the list (only used temporaery)
64 : ImplRegionBandSep* mpFirstSep; // root of the list with x-separations
65 : ImplRegionBandPoint* mpFirstBandPoint; // root of the list with lines
66 : long mnYTop; // actual boundary of the band
67 : long mnYBottom;
68 :
69 : // bitfield
70 : bool mbTouched : 1;
71 :
72 : // create y-band with boundaries
73 : ImplRegionBand( long nYTop, long nYBottom );
74 : /** copy y-band with with all data
75 : @param theSourceBand
76 : The new ImplRegionBand object will
77 : be a copy of this band.
78 : @param bIgnorePoints
79 : When true (the default) the
80 : band points pointed to by
81 : mpFirstBandPoint are not copied.
82 : When false they are copied.
83 : You need the points when you are
84 : planning to call ProcessPoints()
85 : later on.
86 : */
87 : ImplRegionBand( const ImplRegionBand & theSourceBand,
88 : const bool bIgnorePoints = true);
89 : ~ImplRegionBand();
90 :
91 : long GetXLeftBoundary() const;
92 : long GetXRightBoundary() const;
93 :
94 : // combine overlapping bands
95 : bool OptimizeBand();
96 :
97 : // generate separations from lines and process
98 : // union with existing separations
99 : void ProcessPoints();
100 : // insert point in the list for later processing
101 : bool InsertPoint( long nX, long nLineID,
102 : bool bEndPoint, LineType eLineType );
103 :
104 : void Union( long nXLeft, long nXRight );
105 : void Intersect( long nXLeft, long nXRight );
106 : void Exclude( long nXLeft, long nXRight );
107 : void XOr( long nXLeft, long nXRight );
108 :
109 : void MoveX( long nHorzMove );
110 : void ScaleX( double fHorzScale );
111 :
112 : bool IsInside( long nX );
113 :
114 0 : bool IsEmpty() const { return ((!mpFirstSep) && (!mpFirstBandPoint)); }
115 :
116 : bool operator==( const ImplRegionBand& rRegionBand ) const;
117 :
118 : /** Split the called band at the given vertical coordinate. After the
119 : split the called band will cover the upper part not including nY.
120 : The new band will cover the lower part including nY.
121 : @param nY
122 : The band is split at this y coordinate. The new, lower band
123 : will include this very value.
124 : @return
125 : Returns the new, lower band.
126 : */
127 : ImplRegionBand* SplitBand (const sal_Int32 nY);
128 : };
129 :
130 : #endif // INCLUDED_VCL_INC_REGBAND_HXX
131 :
132 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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