俊隆ㄉ計算機圖學筆記 - Week 2

#include <GL/glut.h>
void display()
{
    glClearColor(0,0,1,3);// The background color
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    // Using Double Buffer and Depth Buffer
    glColor3f(1,0,1); // Have three float argument, to change the thing's color
    glBegin(GL_LINE_LOOP);// Begin to draw a polygon, 
    //or using GL_POLYGON to draw a polygon
    glVertex3f(0.5,0,0); // To draw the point, the argument means x,y,z axis
    glVertex3f(0,1,0);
    glVertex3f(1,0,0);
    glVertex3f(3,0,0);
    glVertex3f(3,5,0);
    glEnd(); // End Drawing
    glutSwapBuffers();
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("GLUT");
    glutDisplayFunc(display); // Register display function.
    glutMainLoop();
}