OpenGL House

// Vezbe_1.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include "pch.h"
#include <iostream>
#include <GL/freeglut.h>

void roof1(void)
{
    // Bira se boja koja ce se koristiti u poligonu za prikaz
    glColor3f(0.91, 0.51, 0.51);

    // Crtanje poligona krece iz donjeg levog ugla
    glBegin(GL_POLYGON);

    // Na ekranu bice vidljive koordinate na intervalu 0.0 - 1.0
    glVertex3f(0.25, 0.45, 0.0); // DL
    glVertex3f(0.75, 0.45, 0.0); // DR
    glVertex3f(0.65, 0.75, 0.0); // GR
    glVertex3f(0.35, 0.75, 0.0); // GL

    glEnd();
}

void roof2(void)
{
    // Sada ne zelimo da cistimo bafer, jer zelimo prikazati dva elementa
    // glClear(GL_COLOR_BUFFER_BIT);

    // Bira se boja koja ce se koristiti u poligonu za prikaz
    glColor3f(0.91, 0.91, 0.51);

    // Crtanje poligona krece iz donjeg levog ugla
    glBegin(GL_POLYGON);

    // Na ekranu bice vidljive koordinate na intervalu 0.0 - 1.0
    glVertex3f(0.45, 0.45, 1.0); // DL
    glVertex3f(0.75, 0.45, 1.0); // DR
    glVertex3f(0.65, 0.75, 0.0); // GR
    glVertex3f(0.35, 0.75, 0.0); // GL

    glEnd();
}

void base(void)
{
    glColor3f(0.36, 0.9, 0.9);

    glBegin(GL_POLYGON);

    glVertex3f(0.27, 0.16, 0);
    glVertex3f(0.73, 0.16, 0);
    glVertex3f(0.73, 0.45, 0);
    glVertex3f(0.27, 0.45, 0);

    glEnd();
}

void door(void)
{
    glColor3f(0.36, 0.4, 0.4);

    glBegin(GL_POLYGON);

    glVertex3f(0.30, 0.16, 0);
    glVertex3f(0.40, 0.16, 0);
    glVertex3f(0.40, 0.36, 0);
    glVertex3f(0.30, 0.36, 0);

    glEnd();
}

void circle(float radius)
{
    glColor3f(0.36, 0.4, 1);
    glBegin(GL_POLYGON); // GL_LINE_LOOP

    for (int i = 0; i < 360; i++)
    {
        float degInRad = i * (3.14159 / 180);
        glVertex2f(cos(degInRad)*radius + 0.348, sin(degInRad)*radius + 0.56);
    }

    glEnd();
}

void display(void)
{
    // Navodimo koji bafer zelimo ocistiti
    glClear(GL_COLOR_BUFFER_BIT);

    roof1();
    roof2();
    base();
    door();
    circle(0.036);

    // Prikaz sadrzaja bafera
    glFlush();
}

void init(void)
{
    // Postavlja pozadinu ekrana
    glClearColor(0.0, 0.0, 0.0, 0.0);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    // Koji deo modela ce biti prikazan
    glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}

int main(int argc, char* argv[])
{
    glutInit(&argc, argv);

    // Inicijalizacija, mod za prikaz, velicina, pozicija, naziv prozora
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(250, 250);
    glutInitWindowPosition(100, 80);
    glutCreateWindow("Hello");

    init();

    glutDisplayFunc(display);
    glutMainLoop();

    return 0;
}