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
|
/****************************************************************************
Copyright (C) 2002-2007 Gilles Debunne (Gilles.Debunne@imag.fr)
This file is part of the QGLViewer library.
Version 2.2.6-3, released on August 28, 2007.
http://artis.imag.fr/Members/Gilles.Debunne/QGLViewer
libQGLViewer is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libQGLViewer 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with libQGLViewer; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
#include "manipulatedFrame.h"
#include <math.h>
using namespace qglviewer;
using namespace std;
static void drawSpiral()
{
const float nbSteps = 200.0;
glBegin(GL_QUAD_STRIP);
for (float i=0; i<nbSteps; ++i)
{
float ratio = i/nbSteps;
float angle = 21.0*ratio;
float c = cos(angle);
float s = sin(angle);
float r1 = 1.0 - 0.8*ratio;
float r2 = 0.8 - 0.8*ratio;
float alt = ratio - 0.5;
const float nor = .5;
const float up = sqrt(1.0-nor*nor);
glColor3f(1-ratio, .2 , ratio);
glNormal3f(nor*c, up, nor*s);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+0.05, r2*s);
}
glEnd();
}
void Viewer::init()
{
// Swap the CAMERA and FRAME state keys (NoButton and Control)
// Save CAMERA binding first. See setHandlerKeyboardModifiers() documentation.
#if QT_VERSION < 0x040000
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::AltButton);
setHandlerKeyboardModifiers(QGLViewer::FRAME, Qt::NoButton);
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::ControlButton);
#else
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::AltModifier);
setHandlerKeyboardModifiers(QGLViewer::FRAME, Qt::NoModifier);
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::ControlModifier);
#endif
setMouseBinding(Qt::LeftButton, FRAME, DRIVE);
#ifdef GL_RESCALE_NORMAL // OpenGL 1.2 Only...
glEnable(GL_RESCALE_NORMAL);
#endif
// Add a manipulated frame to the viewer.
// If you are not "using namespace qglqglviewer", you need
// to specify: new qglviewer::ManipulatedFrame().
setManipulatedFrame(new ManipulatedFrame());
help();
restoreStateFromFile();
// Make world axis visible
setAxisIsDrawn();
}
void Viewer::draw()
{
// Here we are in the world coordinate system.
// Draw your scene here.
// Save the current model view matrix (not needed here in fact)
glPushMatrix();
// Multiply matrix to get in the frame coordinate system.
glMultMatrixd(manipulatedFrame()->matrix());
// Scale down the drawings
glScalef(0.3, 0.3, 0.3);
// Draw an axis using the QGLViewer static function
drawAxis();
// Draws a frame-related spiral.
drawSpiral();
// Restore the original (world) coordinate system
glPopMatrix();
}
QString Viewer::helpString() const
{
QString text("<h2>M a n i p u l a t e d F r a m e</h2>");
text += "A <i>ManipulatedFrame</i> converts mouse gestures into <i>Frame</i> displacements. ";
text += "In this example, such an object defines the position of the spiral that can hence be manipulated.<br><br>";
text += "Adding two lines of code will then allow you to move the objects of ";
text += "your scene using the mouse. The button bindings of the <i>ManipulatedFrame</i> ";
text += "are the same than for the camera. Spinning is possible.<br><br>";
text += "Default key bindings have been changed in this example : press <b>Control</b> ";
text += "while moving the mouse to move the camera instead of the ManipulatedFrame.";
return text;
}
|
