Sun Feb 19, 2012 10:10 pm
#include <GL\glut.h>
GLfloat xRotated, yRotated, zRotated;
// Tetrahedron
void displayTetrahedron(void)
{
glMatrixMode(GL_MODELVIEW);
// clear the drawing buffer.
glClear(GL_COLOR_BUFFER_BIT);
// clear the identity matrix.
glLoadIdentity();
// traslate the draw by z = -4.0
// Note this when you decrease z like -8.0 the drawing will looks far , or smaller.
glTranslatef(0.0,0.0,-4.5);
// Red color used to draw.
glColor3f(0.8, 0.2, 0.1);
// changing in transformation matrix.
// rotation about X axis
glRotatef(xRotated,1.0,0.0,0.0);
// rotation about Y axis
glRotatef(yRotated,0.0,1.0,0.0);
// rotation about Z axis
glRotatef(zRotated,0.0,0.0,1.0);
// scaling transfomation
glScalef(1.0,1.0,1.0);
// built-in (glut library) function , draw you a Tetrahedron.
glutSolidTetrahedron();
// Flush buffers to screen
glFlush();
// sawp buffers called because we are using double buffering
// glutSwapBuffers();
}
void reshapeTetrahedron(int x, int y)
{
if (y == 0 || x == 0) return; //Nothing is visible then, so return
//Set a new projection matrix
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//Angle of view:40 degrees
//Near clipping plane distance: 0.5
//Far clipping plane distance: 20.0
gluPerspective(40.0,(GLdouble)x/(GLdouble)y,0.5,20.0);
glViewport(0,0,x,y); //Use the whole window for rendering
}
void idleTetrahedron(void)
{
yRotated += 0.01;
displayTetrahedron();
}
int main (int argc, char **argv)
{
//Initialize GLUT
glutInit(&argc, argv);
//double buffering used to avoid flickering problem in animation
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
// window size
glutInitWindowSize(400,350);
// create the window
glutCreateWindow("Tetrahedron Rotating Animation");
glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
xRotated = yRotated = zRotated = 30.0;
xRotated=33;
yRotated=40;
glClearColor(0.0,0.0,0.0,0.0);
//Assign the function used in events
glutDisplayFunc(displayTetrahedron);
glutReshapeFunc(reshapeTetrahedron);
glutIdleFunc(idleTetrahedron);
//Let start glut loop
glutMainLoop();
return 0;
}
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