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ClippingNode.cc
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40 \*===========================================================================*/
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Author$ *
46 * $Date$ *
47 * *
48 \*===========================================================================*/
49
50
51
52
53 //=============================================================================
54 //
55 // CLASS ClippingNode - IMPLEMENTATION
56 //
57 //=============================================================================
58
59
60 //== INCLUDES =================================================================
61
62
63 #include "ClippingNode.hh"
64
65 #include <QImage>
66
67
68 //== NAMESPACES ===============================================================
69
70
71 namespace ACG {
72 namespace SceneGraph {
73
74
75 //== IMPLEMENTATION ==========================================================
76
77
78 void
79 ClippingNode::set_plane(const Vec3f& _position,
80 const Vec3f& _normal,
81 float _eps)
82 {
83 position_ = _position;
84 normal_ = _normal; normal_.normalize();
85 slice_width_ = _eps;
86
87
88 // one clipping plane
89 if (slice_width_ == 0.0)
90 {
91 plane0_[0] = normal_[0];
92 plane0_[1] = normal_[1];
93 plane0_[2] = normal_[2];
94 plane0_[3] = -(normal_|position_);
95 }
96
97
98 // two planes -> slice
99 else
100 {
101 float d = -(normal_|position_);
102 if (d > 0) { normal_ = -normal_; d = -d; }
103
104 plane0_[0] = normal_[0];
105 plane0_[1] = normal_[1];
106 plane0_[2] = normal_[2];
107 plane0_[3] = d + 0.5f*slice_width_;
108
109 plane1_[0] = -normal_[0];
110 plane1_[1] = -normal_[1];
111 plane1_[2] = -normal_[2];
112 plane1_[3] = -(d - 0.5f*slice_width_);
113 }
114
115
116 set_offset(offset_);
117 }
118
119
120 //----------------------------------------------------------------------------
121
122
123 void
124 ClippingNode::set_offset(float _offset)
125 {
126 offset_ = _offset;
127
128 offset_plane0_[0] = plane0_[0];
129 offset_plane0_[1] = plane0_[1];
130 offset_plane0_[2] = plane0_[2];
131 offset_plane0_[3] = plane0_[3] - offset_;
132
133 offset_plane1_[0] = plane1_[0];
134 offset_plane1_[1] = plane1_[1];
135 offset_plane1_[2] = plane1_[2];
136 offset_plane1_[3] = plane1_[3] + offset_;
137 }
138
139
140 //----------------------------------------------------------------------------
141
142
143 void ClippingNode::enter(GLState& /* _state */ , const DrawModes::DrawMode& /* _drawmode */ )
144 {
145 // one clipping plane
146 if (slice_width_ == 0.0)
147 {
148 glClipPlane(GL_CLIP_PLANE0, offset_plane0_);
149 ACG::GLState::enable(GL_CLIP_PLANE0);
150 }
151
152
153 // two planes -> slice
154 else
155 {
156 glClipPlane(GL_CLIP_PLANE0, offset_plane0_);
157 ACG::GLState::enable(GL_CLIP_PLANE0);
158 glClipPlane(GL_CLIP_PLANE1, offset_plane1_);
159 ACG::GLState::enable(GL_CLIP_PLANE1);
160 }
161 }
162
163
164 //----------------------------------------------------------------------------
165
166
167 void ClippingNode::leave(GLState& /* _state */ , const DrawModes::DrawMode& /* _drawmode */ )
168 {
169 ACG::GLState::disable(GL_CLIP_PLANE0);
170 if (slice_width_ > 0.0)
171 ACG::GLState::disable(GL_CLIP_PLANE1);
172 }
173
174
175 //=============================================================================
176 } // namespace SceneGraph
177 } // namespace ACG
178 //=============================================================================
ACG::SceneGraph::ClippingNode::set_plane
void set_plane(const Vec3f &_position, const Vec3f &_normal, float _eps=0.0)
set position and normal of plane
Definition: ClippingNode.cc:79
ACG
Namespace providing different geometric functions concerning angles.
Definition: DBSCANT.cc:51
ACG::SceneGraph::ACG::GLState::enable
static void enable(GLenum _cap)
replaces glEnable, but supports locking
ACG::SceneGraph::ACG::GLState::disable
static void disable(GLenum _cap)
replaces glDisable, but supports locking
ACG::GLState
Definition: GLState.hh:220
ACG::SceneGraph::DrawModes::DrawMode
Specifies a DrawMode.
Definition: DrawModes.hh:294
OpenMesh::VectorT
Definition: Vector11T.hh:83
ACG::SceneGraph::ClippingNode::enter
void enter(GLState &_state, const DrawModes::DrawMode &_drawmode)
set texture
Definition: ClippingNode.cc:143
ACG::SceneGraph::ClippingNode::set_offset
void set_offset(float _dist)
sweep plane along normal by _dist
Definition: ClippingNode.cc:124
ACG::SceneGraph::ClippingNode::leave
void leave(GLState &_state, const DrawModes::DrawMode &_drawmode)
restores original texture (or no-texture)
Definition: ClippingNode.cc:167