Initial revision
[lsystem3d.git] / lsystem3d / src / model.cpp
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 }