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
|
// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntrSegment2Circle2.h"
#include "Wm5IntrLine2Circle2.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrSegment2Circle2<Real>::IntrSegment2Circle2 (const Segment2<Real>& segment,
const Circle2<Real>& circle)
:
mSegment(&segment),
mCircle(&circle)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Segment2<Real>& IntrSegment2Circle2<Real>::GetSegment () const
{
return *mSegment;
}
//----------------------------------------------------------------------------
template <typename Real>
const Circle2<Real>& IntrSegment2Circle2<Real>::GetCircle () const
{
return *mCircle;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrSegment2Circle2<Real>::Find ()
{
Real t[2];
bool intersects = IntrLine2Circle2<Real>::Find(mSegment->Center,
mSegment->Direction, mCircle->Center, mCircle->Radius, mQuantity, t);
if (intersects)
{
// Reduce root count if line-circle intersections are not on segment.
if (mQuantity == 1)
{
if (Math<Real>::FAbs(t[0]) > mSegment->Extent)
{
mQuantity = 0;
}
}
else
{
if (t[1] < -mSegment->Extent || t[0] > mSegment->Extent)
{
mQuantity = 0;
}
else
{
if (t[1] <= mSegment->Extent)
{
if (t[0] < -mSegment->Extent)
{
mQuantity = 1;
t[0] = t[1];
}
}
else
{
mQuantity = (t[0] >= -mSegment->Extent ? 1 : 0);
}
}
}
for (int i = 0; i < mQuantity; ++i)
{
mPoint[i] = mSegment->Center + t[i]*mSegment->Direction;
}
}
mIntersectionType = (mQuantity > 0 ? IT_POINT : IT_EMPTY);
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrSegment2Circle2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrSegment2Circle2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrSegment2Circle2<float>;
template WM5_MATHEMATICS_ITEM
class IntrSegment2Circle2<double>;
//----------------------------------------------------------------------------
}
|
