rotate.c

图形学课件 图形学课件 图形学课件

#include <GL/glut.h>
#include <stdlib.h>

static GLfloat spin = 0.0;


void display(void)
{
    glClear (GL_COLOR_BUFFER_BIT);
    glRectf (-25.0, -25.0, 25.0, 25.0);
    glutSwapBuffers ();
}


void spinDisplay (void)
{
    spin = spin + 2.0;
    if (spin > 360.0)
		spin = spin - 360.0;	
	glLoadIdentity();
    glRotatef (spin, 0.0, 0.0, 1.0);
    glutPostRedisplay();
}


void myinit (void)
{
    glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrtho (-50.0, 50.0, -50.0,50.0,-1.0, 1.0);
		glMatrixMode(GL_MODELVIEW);
	glClearColor (0.0, 0.0, 0.0, 1.0);
    glColor3f (0.0, 1.0, 0.0);
}



int main(int argc, char** argv)
{
	
	glutInit(&argc,argv);

	glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
	glutCreateWindow("double buffered");
    myinit ();
	glutDisplayFunc(display);
    glutIdleFunc (spinDisplay);
	glutMainLoop();

}