1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include <tools/link.hxx>
#include <tools/line.hxx>
#include <tools/debug.hxx>
#include <tools/helpers.hxx>
#include <cstdlib>
#include <math.h>
// --------
// - Line -
// --------
double Line::GetLength() const
{
return hypot( maStart.X() - maEnd.X(), maStart.Y() - maEnd.Y() );
}
// ------------------------------------------------------------------------
sal_Bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
{
double fX, fY;
sal_Bool bRet;
if( Intersection( rLine, fX, fY ) )
{
rIntersection.X() = FRound( fX );
rIntersection.Y() = FRound( fY );
bRet = sal_True;
}
else
bRet = sal_False;
return bRet;
}
// ------------------------------------------------------------------------
sal_Bool Line::Intersection( const Line& rLine, double& rIntersectionX, double& rIntersectionY ) const
{
const double fAx = maEnd.X() - maStart.X();
const double fAy = maEnd.Y() - maStart.Y();
const double fBx = rLine.maStart.X() - rLine.maEnd.X();
const double fBy = rLine.maStart.Y() - rLine.maEnd.Y();
const double fDen = fAy * fBx - fAx * fBy;
sal_Bool bOk = sal_False;
if( fDen != 0. )
{
const double fCx = maStart.X() - rLine.maStart.X();
const double fCy = maStart.Y() - rLine.maStart.Y();
const double fA = fBy * fCx - fBx * fCy;
const sal_Bool bGreater = ( fDen > 0. );
bOk = sal_True;
if ( bGreater )
{
if ( ( fA < 0. ) || ( fA > fDen ) )
bOk = sal_False;
}
else if ( ( fA > 0. ) || ( fA < fDen ) )
bOk = sal_False;
if ( bOk )
{
const double fB = fAx * fCy - fAy * fCx;
if ( bGreater )
{
if ( ( fB < 0. ) || ( fB > fDen ) )
bOk = sal_False;
}
else if ( ( fB > 0. ) || ( fB < fDen ) )
bOk = sal_False;
if( bOk )
{
const double fAlpha = fA / fDen;
rIntersectionX = ( maStart.X() + fAlpha * fAx );
rIntersectionY = ( maStart.Y() + fAlpha * fAy );
}
}
}
return bOk;
}
// ------------------------------------------------------------------------
sal_Bool Line::Intersection( const Rectangle& rRect, Line& rIntersection ) const
{
const sal_Bool bStartInside = rRect.IsInside( maStart );
const sal_Bool bEndInside = rRect.IsInside( maEnd );
sal_Bool bRet = sal_True;
if( bStartInside && bEndInside )
{
// line completely inside rect
rIntersection.maStart = maStart;
rIntersection.maEnd = maEnd;
}
else
{
// calculate intersections
const Point aTL( rRect.TopLeft() ), aTR( rRect.TopRight() );
const Point aBR( rRect.BottomRight() ), aBL( rRect.BottomLeft() );
Point aIntersect1, aIntersect2;
Point* pCurIntersection = &aIntersect1;
if( Intersection( Line( aTL, aTR ), *pCurIntersection ) )
pCurIntersection = &aIntersect2;
if( Intersection( Line( aTR, aBR ), *pCurIntersection ) )
pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
if( pCurIntersection && Intersection( Line( aBR, aBL ), *pCurIntersection ) )
pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
if( pCurIntersection && Intersection( Line( aBL, aTL ), *pCurIntersection ) )
pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
if( !pCurIntersection )
{
// two intersections
rIntersection.maStart = aIntersect1;
rIntersection.maEnd = aIntersect2;
}
else if( pCurIntersection == &aIntersect2 )
{
// one intersection
rIntersection.maStart = aIntersect1;
if( ( maStart != aIntersect1 ) && bStartInside )
rIntersection.maEnd = maStart;
else if( ( maEnd != aIntersect1 ) && bEndInside )
rIntersection.maEnd = maEnd;
else
rIntersection.maEnd = rIntersection.maStart;
}
else
bRet = sal_False;
}
return bRet;
}
// ------------------------------------------------------------------------
double Line::GetDistance( const double& rPtX, const double& rPtY ) const
{
double fDist;
if( maStart != maEnd )
{
const double fDistX = maEnd.X() - maStart.X();
const double fDistY = maEnd.Y() - maStart.Y();
const double fACX = maStart.X() - rPtX;
const double fACY = maStart.Y() - rPtY;
const double fL2 = fDistX * fDistX + fDistY * fDistY;
const double fR = ( fACY * -fDistY - fACX * fDistX ) / fL2;
const double fS = ( fACY * fDistX - fACX * fDistY ) / fL2;
if( fR < 0.0 )
{
fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
if( fS < 0.0 )
fDist *= -1.0;
}
else if( fR <= 1.0 )
fDist = fS * sqrt( fL2 );
else
{
fDist = hypot( maEnd.X() - rPtX, maEnd.Y() - rPtY );
if( fS < 0.0 )
fDist *= -1.0;
}
}
else
fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
return fDist;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
