Opengl第一个小例子

#include <GL/glut.h>

void init(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0, 200, 0.0, 150.0);
}

void lineSegment(void)
{
glClear(GL_COLOR_BUFFER_BIT);

glColor3f(1.0, 0.0, 0.0);
glBegin(GL_LINES);
glVertex2i(180, 15);
glVertex2i(10, 145);
glEnd();

glFlush();
}

void main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);
glutInitWindowPosition(200, 200);
glutInitWindowSize(400, 300);
glutCreateWindow("an example opengl program");

init();
glutDisplayFunc(lineSegment);
glutMainLoop();

}