[실습 21] RGB 컬러 모델 만들기

#include <GL\glut.h>



void Drawscene();
void Timerfunc(int);
void Menufunc(int);
void Reshape(int, int);

​

static int fps = 100;
static GLfloat angleY = 0.0f;
static GLfloat posY_T = 60.0;
static GLfloat posZ_T = 50.0;
static GLfloat posY_F = 60.0;
static GLfloat posZ_F = 50.0;

​

bool Nothiding = false; // 은면제거 on
bool Culling = false; // 컬링 off
bool flat = false; // smooth on
bool top_open = false; // 윗면 닫힘
bool front_open = false; // 앞면 닫힘

​

int main(int argc, char* argv[])
{
 glutInit(&argc, argv);
 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
 glutInitWindowPosition(300, 100);
 glutInitWindowSize(800,600);
 glutCreateWindow("컴그_실습21");
 glutDisplayFunc(Drawscene);
 glutReshapeFunc(Reshape);
 glutTimerFunc(fps, Timerfunc, 1);

​

 //메뉴
 int menu = glutCreateMenu(Menufunc);
 glutAddMenuEntry("은면 제거 ON", 1);
 glutAddMenuEntry("은면 제거 OFF", 2);
 glutAddMenuEntry("컬링 ON", 3);
 glutAddMenuEntry("컬링 OFF", 4);
 glutAddMenuEntry("쉐이딩 FLAT", 5);
 glutAddMenuEntry("쉐이딩 SMOOTH", 6);
 glutAddMenuEntry("윗면 yes ON", 7);
 glutAddMenuEntry("윗면 no OFF", 8);
 glutAddMenuEntry("앞면 yes ON", 9);
 glutAddMenuEntry("앞면 no OFF", 10);
 glutAttachMenu(GLUT_RIGHT_BUTTON);
 //

​

 glutMainLoop();
}

​

void Reshape(int w, int h)
{
 // 뷰포트 변환 설정
 glViewport(0, 0, w, h);

 // 투영 행렬 스택 재설정
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();

 // 원근투영
 gluPerspective(60.0f, w / h, 1.0, 1000.0); // 원근 거리
 glTranslatef(0.0, 0.0, -300.0);
 glRotatef(30.0f, 1.0f, 0.0f, 0.0f);
 glRotatef(45.0f, 0.0f, 1.0f, 0.0f);
 
 //모델 뷰 행렬 스택 재설정
 glMatrixMode(GL_MODELVIEW);
 
 gluLookAt(0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
 glViewport(0, 0, w, h);
}

​

void Timerfunc(int value)
{
 // 뒷면 애니메이션
 if (top_open == true)
 {
  posY_T += 1.2;
  posZ_T -= 1.0;

  if (posY_T >= 120 && posZ_T <= -100)
  {
   posY_T = 120;
   posZ_T = -100;
  }
 }
 else
 {
  posY_T = 60.0;
  posZ_T = 50.0;
 }

 // 앞면 애니메이션
 if (front_open == true)
 {
  posY_F -= 2.0;
  posZ_F += 1.0;

  if (posY_F <= -60 && posZ_F >= 120)
  {
   posY_F = -60.0;
   posZ_F = 120.0;
  }
 }
 else
 {
  posY_F = 60.0;
  posZ_F = 50.0;
 }

 angleY += 1;

 glutPostRedisplay();
 glutTimerFunc(fps, Timerfunc, 1);
}

​

void Drawscene()
{
 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 glPushMatrix();
 glLoadIdentity();
 glRotatef(angleY, 0.0f, 1.0f, 0.0f);

 // shading
 if (flat == true)
 {
  glShadeModel(GL_FLAT);
 }
 else
 {
  glShadeModel(GL_SMOOTH); // 쉐이딩_스무딩
 }

 // 은면제거_깊이
 if (Nothiding == true)
 {
  glDisable(GL_DEPTH_TEST);
 }
 else
 {
  glEnable(GL_DEPTH_TEST); // 은면제거_깊이검사
 }

 //은면제거_컬링
 if (Culling == true)
 {
  glEnable(GL_CULL_FACE); // 은면제거_뒷면제거 (내부는 잘라낸다.)
 }
 else
 {
  glDisable(GL_CULL_FACE);
 }
 
 glFrontFace(GL_CCW); // 반시계 방향을 앞면
 glBegin(GL_QUADS);
 {
  //앞면
  glColor3f(0.0f, 1.0f, 1.0f);  // Cyan
  glVertex3f(50.0, posY_F, posZ_F);
  glColor3f(1.0f, 1.0, 1.0f);  // 흰색
  glVertex3f(-50.0, posY_F, posZ_F);
  glColor3f(1.0f, 0.0f, 1.0f);  // 마젠타
  glVertex3f(-50.0, -60.0, 50.0f);
  glColor3f(0.0f, 0.0f, 1.0f);  // Blue
  glVertex3f(50.0, -60.0, 50.0f);

  //뒷면
  glColor3f(0.0f, 1.0f, 0.0f);  // Green
  glVertex3f(50.0, 60.0, -50.0);
  glColor3f(1.0f, 1.0f, 0.0f);  // 노란색
  glVertex3f(-50.0, 60.0, -50.0);
  glColor3f(1.0f, 0.0f, 0.0f);  // 빨간색
  glVertex3f(-50.0, -60.0, -50.0);
  glColor3f(0.0f, 0.0f, 0.0f);  // 검은색
  glVertex3f(50.0f, -60.0f, -50.0f);

  //윗면
  glColor3f(0.0f, 1.0f, 1.0f);  // 민트
  glVertex3f(50.0, posY_T, posZ_T);
  glColor3f(0.0f, 1.0f, 0.0f);  // Green
  glVertex3f(50.0, 60.0, -50.0);
  glColor3f(1.0f, 1.0f, 0.0f);  // 노란색
  glVertex3f(-50.0, 60.0, -50.0);
  glColor3f(1.0f, 1.0, 1.0f);  // 흰색
  glVertex3f(-50.0, posY_T, posZ_T);

  //아랫면
  glColor3f(0.0f, 0.0f, 0.0f);  // 검은색
  glVertex3f(50.0f, -60.0f, -50.0f);
  glColor3f(1.0f, 0.0f, 0.0f);  // 빨간색
  glVertex3f(-50.0, -60.0, -50.0);
  glColor3f(1.0f, 0.0f, 1.0f);  // 마젠타
  glVertex3f(-50.0, -60.0, 50.0f);
  glColor3f(0.0f, 0.0f, 1.0f);  // Blue
  glVertex3f(50.0, -60.0, 50.0f);

  //왼면
  glColor3f(1.0f, 1.0f, 1.0f);  // White
  glVertex3f(-50.0, 60.0, 50.0f);
  glColor3f(1.0f, 1.0f, 0.0f);  // Yellow
  glVertex3f(-50.0, 60.0, -50.0);
  glColor3f(1.0f, 0.0f, 0.0f);  // Red
  glVertex3f(-50.0, -60.0, -50.0);
  glColor3f(1.0f, 0.0f, 1.0f);  // Magenta
  glVertex3f(-50.0, -60.0, 50.0f);

  //오른면
  glColor3f(0.0f, 1.0f, 0.0f);  // Green
  glVertex3f(50.0, 60.0, -50.0);
  glColor3f(0.0f, 1.0f, 1.0f);  // Cyan
  glVertex3f(50.0, 60.0, 50.0f);
  glColor3f(0.0f, 0.0f, 1.0f);  // Blue
  glVertex3f(50.0, -60.0, 50.0f);
  glColor3f(0.0f, 0.0f, 0.0f);  // Black
  glVertex3f(50.0f, -60.0f, -50.0f);
 }
 glEnd();
 glPopMatrix();

 glutSwapBuffers();
}

​

void Menufunc(int button)
{
 switch (button)
 {
 case 1:
  Nothiding = false;
  break;
 case 2:
  Nothiding = true;
  break;
 case 3:
  Culling = true;
  break;
 case 4:
  Culling = false;
  break;
 case 5:
  flat = true;
  break;
 case 6:
  flat = false;
  break;
 case 7:
  top_open = false;
  break;
 case 8:
  top_open = true;
  break;
 case 9:
  front_open = false;
  break;
 case 10:
  front_open = true;
  break;
 default:
  break;
 }
 glutPostRedisplay();
}