openGL_torus_animated.c File Reference

#include <GL/glut.h>
#include <math.h>
#include <stdio.h>

Go to the source code of this file.

Macros
#define	pi   3.142857

Functions
void	reshape (GLint w, GLint h)
void	display ()
void	timer (int v)
void	mouse (int button, int state, int x, int y)
void	init ()
int	main (int argc, char **argv)

Variables
static bool	spinning = true
static const int	FPS = 20
static GLfloat	current_rot = 0.0

Macro Definition Documentation

pi

#define pi   3.142857

Definition at line 8 of file openGL_torus_animated.c.

Function Documentation

display()

void display

(

void

)

Definition at line 38 of file openGL_torus_animated.c.

               {
    // setting every pixel in frame buffer to a clear color
    glClear(GL_COLOR_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
 
    glColor3f(1.0, 1.0, 1.0);
    glRotatef(current_rot, 0.0, 0.0, 1.0);
    glutWireTorus(0.5, 3, 15, 30);
 
    // being drawing
 
    glBegin(GL_POLYGON);
    glRotatef(current_rot, 1.0, 0.0, 1.0);
    glColor3f(1, 0, 0);
    glVertex3f(0, 0, 0);
    glVertex3f(10, 0, 0);
    glColor3f(0, 1, 0);
    glVertex3f(0, 0, 0);
    glVertex3f(0, 10, 0);
    glColor3f(0, 0, 1);
    glVertex3f(0, 0, 0);
    glVertex3f(0, 0, 10);
    glEnd();
 
    glRotatef(current_rot, 1.0, 0.0, 1.0);
 
    // flush the draw cmd to display image immediately
    glFlush();
    glutSwapBuffers();
}

References current_rot.

Referenced by main().

init()

void init

(

)

Definition at line 98 of file openGL_torus_animated.c.

            {
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glColor3f(1.0, 1.0, 1.0);
 
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, 4.0 / 3.0, 1, 40);
 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(4, 6, 5, 0, 0, 0, 0, 1, 0);
}

Referenced by main().

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 111 of file openGL_torus_animated.c.

                                {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
 
    // Position window at (80,80)-(480,380) and give it a title.
    glutInitWindowPosition(80, 80);
    glutInitWindowSize(1000, 800);
    glutCreateWindow("A Torus on a Plane");
 
    glutReshapeFunc(reshape);
 
    // Tell GLUT that whenever the main window needs to be repainted
    // that it should call the function display().
    glutDisplayFunc(display);
    glutTimerFunc(100, timer, 0);
    glutMouseFunc(mouse);
 
    init();
 
    glutMainLoop();
}

References display(), init(), mouse(), reshape(), and timer().

mouse()

void mouse	(	int	button,
		int	state,
		int	x,
		int	y
	)

Definition at line 90 of file openGL_torus_animated.c.

                                                {
    if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {
        spinning = true;
    } else if (button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN) {
        spinning = false;
    }
}

References spinning.

Referenced by main().

reshape()

void reshape	(	GLint	w,
		GLint	h
	)

Definition at line 19 of file openGL_torus_animated.c.

                               {
    glViewport(0, 0, w, h);
    GLfloat aspect = (GLfloat)w / (GLfloat)h;
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
 
    if (w <= h) {
        // width is smaller, go from -50 .. 50 in width
        glOrtho(-50.0, 50.0, -50.0 / aspect, 50.0 / aspect, -1.0, 1.0);
    }
 
    else {
        // height is smaller, go from -50 .. 50 in height
        // glOrtho(-50.0*aspect, 50.0*aspect, -50.0, 50.0, -1.0, 1.0);
 
        glOrtho(-10.0 * aspect, 10.0 * aspect, -10.0, 10.0, -1.0, 1.0);
    }
}

Referenced by main().

timer()

void timer

(

int

v

)

Definition at line 73 of file openGL_torus_animated.c.

                  {
    if (spinning) {
        current_rot += 1.0;
 
        if (current_rot > 360.0) {
            current_rot -= 360.0;
        }
        glutPostRedisplay();
    }
 
    glutTimerFunc(1000 / FPS, timer, v);
}

References current_rot, FPS, and spinning.

Referenced by main().

Variable Documentation

current_rot

GLfloat current_rot = 0.0

static

Definition at line 14 of file openGL_torus_animated.c.

Referenced by display(), and timer().

FPS

const int FPS = 20

static

Definition at line 11 of file openGL_torus_animated.c.

Referenced by timer().

spinning

bool spinning = true

static

Definition at line 10 of file openGL_torus_animated.c.

Referenced by mouse(), and timer().