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1 | // Copyright (C) 2006 Erik Dahlberg | |
2 | // | |
3 | // This file is part of LSystem3d. | |
4 | // | |
5 | // LSystem3D is free software; you can redistribute it and/or | |
6 | // modify it under the terms of the GNU General Public License | |
7 | // as published by the Free Software Foundation; either version 2 | |
8 | // of the License, or (at your option) any later version. | |
9 | // | |
10 | // LSystem3D is distributed in the hope that it will be useful, | |
11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | // GNU General Public License for more details. | |
14 | // | |
15 | // You should have received a copy of the GNU General Public License | |
16 | // along with LSystem3D; if not, write to the Free Software | |
17 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | ||
19 | ||
20 | ||
21 | ||
22 | #include "GL/gl.h" | |
23 | #include "GL/glu.h" | |
24 | ||
25 | #include "model.h" | |
26 | #include "vector.h" | |
27 | ||
28 | ||
29 | ||
30 | /** | |
31 | * Constructor | |
32 | */ | |
33 | Model::Model() | |
34 | { | |
35 | _displayList = glGenLists(1); | |
36 | } | |
37 | ||
38 | ||
39 | ||
40 | /** | |
41 | * Destructor | |
42 | */ | |
43 | Model::~Model() | |
44 | { | |
45 | glDeleteLists(_displayList, 1); | |
46 | } | |
47 | ||
48 | ||
49 | ||
50 | /** | |
51 | * Connect two points | |
52 | * @param diameter diameter of segment | |
53 | * @param x1 x start point | |
54 | * @param y1 y start point | |
55 | * @param z1 z start point | |
56 | * @param x2 x end point | |
57 | * @param y2 y end point | |
58 | * @param z2 z end point | |
59 | */ | |
60 | void Model::segment(double diameter, double x1, double y1, double z1, double x2, double y2, double z2) | |
61 | { | |
62 | // wireframe | |
63 | // | |
64 | // glColor3f(1,1,1); | |
65 | // glBegin(GL_LINES); | |
66 | // glVertex3d(x1, y1, z1); | |
67 | // glVertex3d(x2, y2, z2); | |
68 | // glEnd(); | |
69 | ||
70 | ||
71 | ||
72 | // solid | |
73 | ||
74 | // find rotation vector and angle of cylinder | |
75 | ||
76 | Vector initial(0.0, 1.0, 0.0); // initial rotation of cylinder | |
77 | Vector desired(x2-x1, y2-y1, z2-z1); // desired rotation of cylinder | |
78 | desired.normalize(); | |
79 | ||
80 | // rotation angle | |
81 | double angle = initial.getAngle(desired); | |
82 | ||
83 | // rotation vector | |
84 | Vector crossProduct = initial.getCrossProduct(desired); | |
85 | crossProduct.normalize(); | |
86 | ||
87 | ||
88 | // render the cylinder | |
89 | ||
90 | GLUquadric *quadric = gluNewQuadric(); | |
91 | ||
92 | glColor3f(1.0, 0.5, 0.0); | |
93 | ||
94 | glPushMatrix(); | |
95 | glTranslatef(x1, y1, z1); | |
96 | glRotatef(angle, crossProduct.getX(), crossProduct.getY(), crossProduct.getZ()); | |
97 | glRotatef(-90, 1, 0, 0); | |
98 | ||
99 | gluCylinder(quadric, diameter, diameter, 1.0, 6, 6); | |
100 | glPopMatrix(); | |
101 | } | |
102 | ||
103 | ||
104 | ||
105 | /** | |
106 | * Draw model to screen | |
107 | */ | |
108 | void Model::draw() | |
109 | { | |
110 | glCallList(_displayList); | |
111 | } | |
112 | ||
113 | ||
114 | ||
115 | /** | |
116 | * Clear the model | |
117 | */ | |
118 | void Model::clear() | |
119 | { | |
120 | // TODO: not needed? | |
121 | } | |
122 | ||
123 | ||
124 | ||
125 | /** | |
126 | * Start recording of drawing operations | |
127 | */ | |
128 | void Model::begin() | |
129 | { | |
130 | glNewList(_displayList, GL_COMPILE); | |
131 | } | |
132 | ||
133 | ||
134 | ||
135 | /** | |
136 | * Stop recording of drawing operations | |
137 | */ | |
138 | void Model::end() | |
139 | { | |
140 | glEndList(); | |
141 | } | |
142 | ||
143 | ||
144 | ||
145 | /** | |
146 | * Begin creation of a filled surface | |
147 | */ | |
148 | void Model::fillBegin() | |
149 | { | |
150 | glColor3f(0.0, 0.5, 0.0); | |
151 | glBegin(GL_POLYGON); | |
152 | } | |
153 | ||
154 | ||
155 | ||
156 | /** | |
157 | * End creation of a filled surface | |
158 | */ | |
159 | void Model::fillEnd() | |
160 | { | |
161 | glEnd(); | |
162 | } | |
163 | ||
164 | ||
165 | ||
166 | /** | |
167 | * Create one vertex in the filled surface | |
168 | * @param x x-coordinate | |
169 | * @param y y-coordinate | |
170 | * @param z z-coordinate | |
171 | */ | |
172 | void Model::point(double x, double y, double z) | |
173 | { | |
174 | glVertex3d(x, y, z); | |
175 | } |