#include <iostream>
#include <GL/glut.h>
using namespace std;
void mydisplay() {
    float x, q = 0.7, y;
    int i = 1;
    glClear(GL_COLOR_BUFFER_BIT); // Menghapus layar
    glBegin(GL_LINE_STRIP);
    for(x=-1;x<=1;x+=0.2) {
        if (i % 2 == 0) y = -q; else y = q;
        i++;
        glVertex2f(x,y);
        printf("p: %0.4f, y: %0.4f\n",x,y);
    }
    glEnd(); glFlush();
}
int main() {
    glutCreateWindow( "Pemrograman Grafik RPL 2017");
    glutDisplayFunc(mydisplay);
    glutMainLoop();
    return 0;
}