[실습 14] 도형 2개 그리기 및 변환하기

 

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



void drawscene();
void Reshape(int w, int h);
void Keyboard(unsigned char key, int x, int y);
void MenuFunc(int);
void Timerfunction(int value);

​

static GLfloat angleX = 0.0f;
static GLfloat angleY = 0.0f;
static GLfloat angleZ = 0.0f;
static GLfloat angleR = 0.0f;

​

bool turn_L = false;
bool turn_R = false;

​

const int fps = 1;
int whatshape = 0; //1.육면체 2.원뿔 3.구 4.주전자

​

int main()
{
 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA|GLUT_DEPTH);
 glutInitWindowPosition(300, 100);
 glutInitWindowSize(800, 600);
 glutCreateWindow("컴그_실습14");
 glutKeyboardFunc(Keyboard);
 glutDisplayFunc(drawscene);
 glutReshapeFunc(Reshape);

​

 // 메뉴
 int mainmenu;
 mainmenu = glutCreateMenu(MenuFunc);
 glutAddMenuEntry("Square", 1);
 glutAddMenuEntry("Cone", 2);
 glutAddMenuEntry("Sphere", 3);
 glutAddMenuEntry("Teapot", 4);
 glutAddMenuEntry("Exit", 5);

//


 glutAttachMenu(GLUT_RIGHT_BUTTON);

 glutTimerFunc(fps, Timerfunction, 1);
 glutMainLoop();

}

​

void Reshape(int w, int h)
{
 //GLfloat nRange = 800.0f;

 // 뷰포트 변환 설정
 glViewport(0, 0, w, h);

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

 // 원근투영
 gluPerspective(80.0f, w / h, 1.0, 600.0); // 원근 거리
 glTranslatef(0.0, 0.0, -195.0); // 어느 정도 거리에서 볼 것인가. (아마 카메라..?)

 //모델 뷰 행렬 스택 재설정
 glMatrixMode(GL_MODELVIEW);

 glRotatef(angleX, 1.0, 0.0, 0.0);
 glRotatef(angleY, 0.0, 1.0, 0.0);
 glRotatef(angleZ, 0.0, 0.0, 1.0);
 // 카메라   *관측 변환: 카메라의 위치 설정 (필요한 경우, 다른 곳에 설정 가능)
 gluLookAt(0.0, 0.0, 0.0, 0.0, 0.0, -1.0, 0.0, 1.0, 0.0);
 glViewport(0, 0, w, h);

 //glLoadIdentity();
}

​

void Keyboard(unsigned char key, int x, int y)
{
 switch (key)
 {
 case 'x': // X축회전
  angleY = 0.0;
  angleZ = 0.0;
  angleR = 0.0;
  angleX += 0.1;
  break;
 case 'y': // Y축회전
  angleX = 0.0;
  angleZ = 0.0;
  angleR = 0.0;
  angleY += 0.1;
  break;
 case'z': // Z축회전
  angleX = 0.0;
  angleY = 0.0;
  angleR = 0.0;
  angleZ += 0.1;
  break;
 case 'i': //초기화
  angleX = 0.0f;
  angleY = 0.0f;
  angleZ = 0.0f;
  angleR = 0.0f;
  turn_L = false;
  turn_R = false;
  glLoadIdentity();
  break;
 case 'w': // 바닥은 x축회전, 도형은 y축회전
  angleX += 0.1;
  turn_L = true;
  turn_R = true;
  break;
 case 'l': //L(왼쪽 도형)만 제자리에서 Y축 회전
  turn_L = true;
  break;
 case 'r': //R(오른쪽 도형)만 제자리에서 Y축 회전
  turn_R = true;
  break;
 default:
  break;
 }
 Reshape(800, 600);
 glutPostRedisplay();
}

​

void drawscene()
{
 glClearColor(1.0f, 1.0f, 1.0f, 1.0f); // 바탕색 흰 색
 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

 // 초기화

 // --- XZ축 바닥
 glColor3f(0.0, 1.0, 1.0);
 glBegin(GL_POLYGON);
  glVertex3f(-70.0, -20.0, 70.0);
  glVertex3f(70.0, -20.0, 70.0);
  glVertex3f(70.0, -20.0, -70.0);
  glVertex3f(-70.0, -20.0, -70.0);
 glEnd();

 glPushMatrix();
 glTranslatef(0.0, 10.0, 0.0);
 glLineWidth(3);
 glBegin(GL_LINES);
  //X축
  glColor3f(1.0f, 0.0f, 0.0f);
  glVertex3f(8.0f, 0.0f, 0.0f);
  glVertex3f(0.0f, 0.0f, 0.0f);
  //Y축
  glColor3f(0.0f, 1.0f, 0.0f);
  glVertex3f(0.0f, 8.0f, 0.0f);
  glVertex3f(0.0f, 0.0f, 0.0f);
  //Z축
  glColor3f(0.0f, 0.0f, 1.0f);
  glVertex3f(0.0f, 0.0f, 8.0f);
  glVertex3f(0.0f, 0.0f, 0.0f);
 glEnd();
 glPopMatrix();

 // 육면체
 if (whatshape == 1) {
  glLineWidth(1);
  glPushMatrix();
   glColor3f(1.0, 1.0, 0.0);
   glTranslatef(-25.0, -10.0, -10.0);
   glScalef(1.0, 2.0, 1.0);
   if (turn_L == true)
   {
    glRotatef(angleR, 0.0, 1.0, 0.0);
   }
   glutSolidCube(20);
  glPopMatrix();

  glPushMatrix();
   glColor3f(1.0, 1.0, 0.0);
   glTranslatef(25.0, -10.0, -5.0);
   glScalef(2.0, 1.0, 1.0);
   if (turn_R == true)
   {
    glRotatef(angleR, 0.0, 1.0, 0.0);
   }
   glutWireCube(20);
  glPopMatrix();
 }
 //원뿔
 else if (whatshape == 2)
 {
  glLineWidth(1);
  glPushMatrix();
   glColor3f(1.0f, 0.0f, 0.5f);
   glRotatef(270.0, 1.0, 0.0, 0.0);
   glTranslatef(-25.0, -10.0, -10.0);
    if (turn_L == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutSolidCone(15.0, 40.0, 5.0, 5.0);
  glPopMatrix();

  glPushMatrix();
   glColor3f(1.0f, 0.0f, 0.5f);
   glRotatef(270.0, 1.0, 0.0, 0.0);
   glTranslatef(25.0, -10.0, -10.0);
    if (turn_R == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutWireCone(15.0, 40.0, 5.0, 5.0);
  glPopMatrix();
 }
 //구
 else if (whatshape == 3)
 {
  glLineWidth(1);
  glPushMatrix();
   glColor3f(1.0f, 0.5f, 0.0f);
   glTranslatef(-25.0, -10.0, -10.0);
    if (turn_L == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutSolidSphere(15.0, 50.0, 50.0);
  glPopMatrix();

  glPushMatrix();
   glColor3f(1.0f, 0.5f, 0.0f);
   glTranslatef(25.0, -10.0, -10.0);
    if (turn_R == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutWireSphere(15.0, 10.0, 10.0);
  glPopMatrix();
 }
 //주전자
 else if (whatshape == 4) {
  glLineWidth(1);
  glPushMatrix();
   glColor3f(0.5f, 0.5f, 1.0f);
   glTranslatef(-30.0, -10.0, -10.0);
    if (turn_L == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutSolidTeapot(20);
  glPopMatrix();

  glPushMatrix();
   glColor3f(0.5f, 0.5f, 1.0f);
   glTranslatef(30.0, -10.0, -10.0);
    if (turn_R == true)
    {
     glRotatef(angleR, 0.0, 1.0, 0.0);
    }
   glutWireTeapot(20);
  glPopMatrix();
 }
 else
 {
  ;
 }

 glutSwapBuffers();
}


void Timerfunction(int value)
{
 angleR += 0.1;
 glutPostRedisplay();
 glutTimerFunc(fps,Timerfunction,1);
}

void MenuFunc(int button)
{
 switch (button)
 {
 case 1:
  whatshape = 1;
  break;
 case 2:
  whatshape = 2;
  break;
 case 3:
  whatshape = 3;
  break;
 case 4:
  whatshape = 4;
  break;
 case 5:
  exit(1);
  break;
 default:
  break;
 }
 glutPostRedisplay();
} 

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