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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
#include <GL/gl.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <math.h>
//angle of rotation
float xpos = 0, ypos = 0, zpos = 0, xrot = 0, yrot = 0, angle=0.0;
float lastx, lasty;
//positions of the cubes
float positionz[10];
float positionx[10];
void cubepositions (void) { //set the positions of the cubes
for (int i=0;i<10;i++)
{
positionz[i] = rand()%5 + 5;
positionx[i] = rand()%5 + 5;
}
}
//draw the cube
void cube (void) {
for (int i=0;i<10;i++)
{
glPushMatrix();
glTranslated(-positionx[i + 1] * 10, 0, -positionz[i + 1] *
10); //translate the cube
glutSolidCube(2); //draw the cube
glPopMatrix();
}
}
void init (void) {
cubepositions();
}
void enable (void) {
glEnable (GL_DEPTH_TEST); //enable the depth testing
glEnable (GL_LIGHTING); //enable the lighting
glEnable (GL_LIGHT0); //enable LIGHT0, our Diffuse Light
glShadeModel (GL_SMOOTH); //set the shader to smooth shader
}
void camera (void) {
glRotatef(xrot,1.0,0.0,0.0); //rotate our camera on teh x-axis (left and right)
glRotatef(yrot,0.0,1.0,0.0); //rotate our camera on the y-axis (up and down)
glTranslated(-xpos,-ypos,-zpos); //translate the screen to the position of our camera
}
void display (void) {
glClearColor (1.0,0.0,0.0,1.0); //clear the screen to black
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //clear the color buffer and the depth buffer
glLoadIdentity();
camera();
enable();
cube(); //call the cube drawing function
glutSwapBuffers(); //swap the buffers
angle++; //increase the angle
}
void reshape (int w, int h) {
glViewport (0, 0, (GLsizei)w, (GLsizei)h); //set the viewport to the current window specifications
glMatrixMode (GL_PROJECTION); //set the matrix to projection
glLoadIdentity ();
gluPerspective (60, (GLfloat)w / (GLfloat)h, 1.0, 1000.0); //set the perspective (angle of sight, width, height, , depth)
glMatrixMode (GL_MODELVIEW); //set the matrix back to model
}
void keyboard (unsigned char key, int x, int y) {
if (key=='q')
{
xrot += 1;
if (xrot >360) xrot -= 360;
}
if (key=='z')
{
xrot -= 1;
if (xrot < -360) xrot += 360;
}
if (key=='w')
{
float xrotrad, yrotrad;
yrotrad = (yrot / 180 * 3.141592654f);
xrotrad = (xrot / 180 * 3.141592654f);
xpos += float(sin(yrotrad)) ;
zpos -= float(cos(yrotrad)) ;
ypos -= float(sin(xrotrad)) ;
}
if (key=='s')
{
float xrotrad, yrotrad;
yrotrad = (yrot / 180 * 3.141592654f);
xrotrad = (xrot / 180 * 3.141592654f);
xpos -= float(sin(yrotrad));
zpos += float(cos(yrotrad)) ;
ypos += float(sin(xrotrad));
}
if (key=='d')
{
float yrotrad;
yrotrad = (yrot / 180 * 3.141592654f);
xpos += float(cos(yrotrad)) * 0.2;
zpos += float(sin(yrotrad)) * 0.2;
}
if (key=='a')
{
float yrotrad;
yrotrad = (yrot / 180 * 3.141592654f);
xpos -= float(cos(yrotrad)) * 0.2;
zpos -= float(sin(yrotrad)) * 0.2;
}
if (key==27)
{
exit(0);
}
}
void mouseMovement(int x, int y) {
int diffx=x-lastx; //check the difference between the current x and the last x position
int diffy=y-lasty; //check the difference between the current y and the last y position
lastx=x; //set lastx to the current x position
lasty=y; //set lasty to the current y position
xrot += (float) diffy; //set the xrot to xrot with the addition of the difference in the y position
yrot += (float) diffx; //set the xrot to yrot with the addition of the difference in the x position
}
int main (int argc, char **argv) {
glutInit (&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow ("A basic OpenGL Window");
init ();
glutDisplayFunc (display);
glutIdleFunc (display);
glutReshapeFunc (reshape);
glutPassiveMotionFunc(mouseMovement); //check for mouse movement
glutKeyboardFunc (keyboard);
glutMainLoop ();
return 0;
}
|
