OpenGL - 큐브회전 (X, Y, Z), 문자출력
설명
3차원 큐브를 X축, Y축, Z축 회전을 하며 (x, y, z키를 눌렀을 경우),
X, Y, Z를 눌렀을 때 우측 하단에 문자열을 출력한다.
소스코드
(앞의 예제와 마찬가지로 생략된 부분은 아래의 링크를 참조한다.)
2017/09/12 - [SW/OpenGL] - OpenGL - 사각형 회전, 색바꾸기
변수
static bool R = true; static bool G = true; static bool B = true; static float theta; bool rot = true; int r, x_axis = 0, y_axis = 1, z_axis = 0; int t_x, t_y, t_z; /// <summary> /// The vertices {x, y, z} /// </summary> GLfloat vertices[8][3] = { { -1, -1, 1 },{ -1, 1, 1 }, { 1, 1, 1 },{ 1, -1, 1 },{ -1, -1, -1 }, { -1, 1, -1 },{ 1, 1, -1 },{ 1, -1, -1 } }; /// <summary> /// The colors {R, G, B} /// </summary> GLfloat colors[8][3] = { { 0, 0, 1 },{ 0, 1, 1 }, { 1, 1, 1 },{ 1, 0, 1 }, { 0, 0, 0 },{ 0, 1, 0 }, { 1, 1, 0 },{ 1, 0, 0 } };
키보드 이벤트
void menu(int item) { keyboard((unsigned char)item, 0, 0); } void keyupfunc(unsigned char key, int x, int y) { t_x = 0; t_y = 0; t_z = 0; } void keyboard(unsigned char key, int x, int y) { switch (key) { case 'q' | 'Q': exit(0); break; case VK_ESCAPE: exit(0); break; case 'x' | 'X': //rotate with x axis { x_axis = 1; y_axis = 0; z_axis = 0; t_x = 1; t_y = 0; t_z = 0; break; } case 'y' | 'Y': //rotate with y axis { x_axis = 0; y_axis = 1; z_axis = 0; t_x = 0; t_y = 1; t_z = 0; break; } case 'z' | 'Z': //rotate with z axis { x_axis = 0; y_axis = 0; z_axis = 1; t_x = 0; t_y = 0; t_z = 1; break; } default: break; } }
렌더링함수
void RenderScene(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.5, 0.5, 0.5, 0, 0, 0, 0, 1, 0); glPushMatrix(); {//push glRotatef(theta, x_axis, y_axis, z_axis); //draw cube quad(0, 3, 2, 1); quad(2, 3, 7, 6); quad(3, 0, 4, 7); quad(1, 2, 6, 5); quad(4, 5, 6, 7); quad(5, 4, 0, 1); glEnd(); }glPopMatrix();//pop glPushMatrix(); {//push glColor3f(1, 0, 0);//red glRasterPos2f(1.4, -1.4);//string position if (t_x == 1)//print X_axis glPrint("X_axis", theta); else if (t_y == 1)//print Y_axis glPrint("Y_axis", theta); else if (t_z == 1)//print Z_axis glPrint("Z_axis", theta); }glPopMatrix();//pop glutPostRedisplay(); glutSwapBuffers(); }
//swap rotate direction void mouseButton(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON) { if (state == GLUT_DOWN) { if (!mouseLeftDown) { if (rot) rot = false; else rot = true; } } else if (state == GLUT_UP) { if (mouseLeftDown) mouseLeftDown = false; } } else if (button == GLUT_RIGHT_BUTTON) { if (state == GLUT_DOWN) { } else if (state = GLUT_UP) { } } glutPostRedisplay(); } void mouseMotion(int x, int y) { if (mouseLeftDown) { double viewport[4]; glGetDoublev(GL_VIEWPORT, viewport); point[1][0] = x / (float)viewport[2] * 500; point[1][1] = (viewport[3] - y) / (float)viewport[3] * 500; } glutPostRedisplay(); }
폰트 설정
//setting font void init(void) { theta = 0.0f; hWnd = GetActiveWindow(); hDC = GetDC(hWnd); listID = glGenLists(1); glNewList(listID, GL_COMPILE); glEndList(); BuildFont(); glutTimerFunc(10, timer, 1); }
void BuildFont(void) { HFONT font; HFONT oldfont; base = glGenLists(96); font = CreateFontA(-24, 0, 0, 0, FW_BOLD, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_TT_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY, FF_DONTCARE | DEFAULT_PITCH, "Courier New"); oldfont = (HFONT)SelectObject(hDC, font); wglUseFontBitmaps(hDC, 32, 96, base); SelectObject(hDC, oldfont); DeleteObject(font); }
void KillFont(GLvoid) { glDeleteLists(base, 96); } //print function void glPrint(const char *fmt, ...) { char text[256]; va_list ap; if (fmt == NULL) return; va_start(ap, fmt); vsprintf(text, fmt, ap); va_end(ap); glPushAttrib(GL_LIST_BIT); {//push glListBase(base - 32); glCallLists(strlen(text), GL_UNSIGNED_BYTE, text); }glPopAttrib();//pop }
cube를 구성할 사각형
/// <summary> /// draw square /// </summary> /// <param name="a">a.</param> /// <param name="b">The b.</param> /// <param name="c">The c.</param> /// <param name="d">The d.</param> void quad(int a, int b, int c, int d) { glBegin(GL_QUADS); glColor3fv(colors[a]); glVertex3fv(vertices[a]); glColor3fv(colors[b]); glVertex3fv(vertices[b]); glColor3fv(colors[c]); glVertex3fv(vertices[c]); glColor3fv(colors[d]); glVertex3fv(vertices[d]); }
메인함수
void main(int argc, char* argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(500, 500); glutCreateWindow("xyz rotate"); glutDisplayFunc(RenderScene); glutReshapeFunc(ChangeSize); glutMouseFunc(mouseButton); glutMotionFunc(mouseMotion); glutTimerFunc(1000 / 30, timer, 1); //timer 실행 glutKeyboardFunc(keyboard); glutKeyboardUpFunc(keyupfunc); //bind menu with keyboard event glutCreateMenu(menu); glutAddMenuEntry("1", 1); glutAddMenuEntry("2", 2); glutAttachMenu(GLUT_RIGHT_BUTTON); init(); SetupRc(); glutMainLoop(); }
실행영상
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