#include <GL/glut.h> void myDisplay(void) { glClearColor(0.0, 0.0, 0.0, 0.0); glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_POLYGON); glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(-0.5, 0.5); glVertex2f(-0.5, -0.5); glVertex2f(0.5, -0.5); glVertex2f(0.5, 0.5); glEnd(); glBegin(GL_TRIANGLES); glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 1.0f); glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.8f, -0.5f); glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(-0.8f, -0.5f); glEnd(); glPointSize(4); glBegin(GL_POINTS); glColor3f(1.0, 0.0, 0.0); glVertex2f(-0.4, -0.4); glColor3f(0.0, 1.0, 0.0); glVertex2f(0, 0); glColor3f(0.0, 0.0, 1.0); glVertex2f(0.4, 0.4); glEnd(); glFlush(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("Hello Opengl!"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0; }