ComGraficaTemplate

#include <stdlib.h>
#include <GL/glut.h>
#include <math.h>
#define WINDOW_HEIGHT 400
#define WINDOW_WIDTH 400

void keyboard(unsigned char key, int x, int y);
void resize(GLsizei w, GLsizei h);
void display(void);
void house(void);
void door(void);
void roof(void);
void floor(void);
void window(void);
void point(void);

int main(int argc, char** argv) {
  // controla se o sistema operacional tem suporte a janelas
  glutInit(&argc, argv);

  // quantidade de buffer de cores e que padrão de cores é RGB ou RGBA
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

  // tamanho da janela
  glutInitWindowSize(400, 400);

  // posicao inicial da janela
  glutInitWindowPosition(WINDOW_HEIGHT, WINDOW_WIDTH);

  // cria janela
  glutCreateWindow("GLUT Test Vinicius ---- exercicio glut");

  glutKeyboardFunc(&keyboard);

  glutReshapeFunc(&resize);

  glutDisplayFunc(display);

  glutMainLoop();

  return EXIT_SUCCESS;
}

void keyboard(unsigned char key, int x, int y) {
  switch (key) {
  case '\x1b':
    exit(EXIT_SUCCESS);
    break;
  }
}

void resize(GLsizei w, GLsizei h) {
  // evite divisao por zero
  if (h == 0)
    h = 1;
  // Especifica as dimensões do Viewport
  glViewport(0, 0, w, h);

  // inicializa os sistemas de cordernadas
  glMatrixMode(GL_PROJECTION);
  // limpa memoria
  glLoadIdentity();

  if (w <= h) {
    gluOrtho2D(0.0f, WINDOW_HEIGHT, 0.0f, WINDOW_WIDTH * h / w);
  } else {
    gluOrtho2D(0.0f, WINDOW_HEIGHT * w / h, 0.0f, WINDOW_WIDTH);
  }
  glMatrixMode(GL_MODELVIEW);
}

void display() {
  glMatrixMode(GL_MODELVIEW);
  // LIMPAR toda a matriz
  glLoadIdentity();
  // cor de fundo
  glClearColor(0, 0, 1, 1);
  // limpa a tela com a cor de fundo
  glClear(GL_COLOR_BUFFER_BIT);

  //centralizar plano cartesiano
  glTranslatef(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2, 0);

  glBegin(GL_QUADS);
  glColor3f(255.0, 255.0, 0.0);
  glVertex2f(-100, -100);
  glVertex2f(-100, 100);
  glVertex2f(100, 100);
  glVertex2f(100, -100);
  glEnd();

  glFlush();
}