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

int x=0;
int z=0;
int z2=90;


void drawQuad1(void)
{
    glBegin (GL_POLYGON);
    glColor3f(0.0,0.0,0.0);
    glVertex2i(0,1);
    glVertex2i(-100,0);
    glColor3f(0.0,0.0,0.0);
    glVertex2i(-100,20);
    glVertex2i(0,20);
    glEnd();
}

void botol(void)
{
    glBegin (GL_POLYGON);
    glColor3f(1.0,0.0,0.0); //R
    glVertex2i(0,1);
    glColor3f(1.0,0.0,0.0); //Y
    glVertex2i(-100,0);
    glColor3f(1.0,0.0,0.0); //B
    glVertex2i(-100,-100);
    glColor3f(1.0,0.0,0.0); //Y
    glVertex2i(0,-100);
    glEnd();
}

void renderScene()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glClearColor(1,1,1,0);
    glLoadIdentity();
    botol();
    glRotatef(x,0,0,1);
    if (z <= 90)
    {
        x-=1;
        z+=1;
    }
    if (z > 90)
    {
        x+=1;
        z2-=1;
    }
    if (z2 < 0)
    {
        x-=1;
        z=0;
        z2=90;
    }
    drawQuad1();
    glFlush();
}

void timer (int value)
{
    glutPostRedisplay();
    glutTimerFunc(10,timer,0);
}

void reshape(int w,int h)
{
    glViewport(0,0,(GLsizei)w,(GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(-320,320.0,-320,320);
    glMatrixMode(GL_MODELVIEW);
}

int main(int argc, char* argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(1000,1000);
    glutInitWindowPosition(0,0);
    glutCreateWindow("2110161022 - Animasi Gelas");
    glutDisplayFunc(renderScene);
    glutReshapeFunc(reshape);
    glutTimerFunc(1,timer,0);
    glutMainLoop();
    return 0;
}