OpenGL에서 제공하는 glRotationf() 함수를 사용하지 않고 물체를 회전시켜라!

Computer_Graphics : 2007. 3. 22. 21:37

001: #include "GL/glut.h"    
002: #include <stdio.h>
003: #include <math.h>
004: #define PI 3.14159265f
005: GLfloat point[8][3]={{50.0,50.0,50.0},//우상앞 0
006:                                         {-50.0,50.0,50.0},//좌상앞 1
007:                                         {-50.0,-50.0,50.0},//좌하앞 2
008:                                         {50.0,-50.0,50.0},//우하앞 3
009:                                         {50.0,50.0,-50.0},//우상뒤 4
010:                                         {-50.0,50.0,-50.0},//좌상뒤 5
011:                                         {-50.0,-50.0,-50.0},//좌하뒤 6
012:                                         {50.0,-50.0,-50.0}};//우하뒤 7
013: const GLfloat rot = .1f;
014: 
015: void myRotatef(char what)
016: {
017:         int i;
018:         
019:         if (what=='x') //X축 회전
020:         {
021:                 for(i=0;i<8;i++)
022:                 {
023:                         point[i][1]=point[i][1]*cos(rot)-point[i][2]*sin(rot);
024:                         point[i][2]=point[i][1]*sin(rot)+point[i][2]*cos(rot);
025: 
026:                 }
027:         }else if(what=='y') //Y축 회전
028:         {
029:                 for(i=0;i<8;i++)
030:                 {
031:                         point[i][0]=point[i][0]*cos(rot)+point[i][2]*sin(rot);
032:                         point[i][2]=point[i][0]*-sin(rot)+point[i][2]*cos(rot);
033:                 }
034:         }else if(what=='z') //Z 축 회전
035:         {
036:                 for(i=0;i<8;i++)
037:                 {
038:                         point[i][0]=point[i][0]*cos(rot)+point[i][1]*-sin(rot);
039:                         point[i][1]=point[i][0]*sin(rot)+point[i][1]*cos(rot);
040:                 }
041:         }
042:         glutPostRedisplay();
043: }
044: 
045: void RenderScene(void)
046: {
047:         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
048:         glPushMatrix();
049:         
050:         glFrontFace(GL_CCW);
051:         glBegin(GL_QUADS);
052:         // Front Face
053:                 // Cyan
054:         glColor3ub((GLubyte) 0, (GLubyte)255, (GLubyte)255);
055:         glVertex3f(point[0][0],point[0][1],point[0][2]);
056:                 glVertex3f(point[1][0],point[1][1],point[1][2]);
057:                 glVertex3f(point[2][0],point[2][1],point[2][2]);
058:                 glVertex3f(point[3][0],point[3][1],point[3][2]);
059:         // Back Face
060:         // Yellow
061:         glColor3f(1.0f, 1.0f, 0.0f);
062:         glVertex3f(point[4][0],point[4][1],point[4][2]);
063:                 glVertex3f(point[7][0],point[7][1],point[7][2]);
064:                 glVertex3f(point[6][0],point[6][1],point[6][2]);
065:                 glVertex3f(point[5][0],point[5][1],point[5][2]);
066:         // Top Face
067:         glColor3f(1.0f, 1.0f, 1.0f);
068:         glVertex3f(point[0][0],point[0][1],point[0][2]);
069:                 glVertex3f(point[4][0],point[4][1],point[4][2]);
070:                 glVertex3f(point[5][0],point[5][1],point[5][2]);
071:                 glVertex3f(point[1][0],point[1][1],point[1][2]);
072:         // Bottom Face
073:                 // Magenta
074:         glColor3ub((GLubyte) 255, (GLubyte)0, (GLubyte)255);
075:         glVertex3f(point[3][0],point[3][1],point[3][2]);
076:                 glVertex3f(point[2][0],point[2][1],point[2][2]);
077:                 glVertex3f(point[6][0],point[6][1],point[6][2]);
078:                 glVertex3f(point[7][0],point[7][1],point[7][2]);                
079:         // Left face
080:         // Green
081:         glColor3f(0.0f, 1.0f, 0.0f);
082:         glVertex3f(point[1][0],point[1][1],point[1][2]);
083:                 glVertex3f(point[5][0],point[5][1],point[5][2]);
084:                 glVertex3f(point[6][0],point[6][1],point[6][2]);
085:                 glVertex3f(point[2][0],point[2][1],point[2][2]);                
086:         // Right face
087:                 glColor3f(0.0f, 0.0f, 1.0f);
088:                 glVertex3f(point[0][0],point[0][1],point[0][2]);
089:                 glVertex3f(point[3][0],point[3][1],point[3][2]);
090:                 glVertex3f(point[7][0],point[7][1],point[7][2]);
091:                 glVertex3f(point[4][0],point[4][1],point[4][2]);                
092: 
093:         glEnd();
094:     glPopMatrix();
095:     glutSwapBuffers();
096: }
097: void SetupRC()
098: {
099:         glClearColor(0.0f, 0.0f, 0.0f, 1.0f );
100:         glEnable(GL_DEPTH_TEST);
101:         glShadeModel(GL_SMOOTH);
102:         glEnable(GL_CULL_FACE);
103: }
104: void SpecialKeys(int key, int x, int y) //조작
105: {
106:         if(key == GLUT_KEY_F1)
107:                 myRotatef('x');
108:     if(key == GLUT_KEY_F2)
109:         myRotatef('y');
110:     if(key == GLUT_KEY_F3)
111:         myRotatef('z');
112:     if(key == GLUT_KEY_F4)
113:                 exit(1);
114: }
115: void ChangeSize(int w, int h)
116: {
117:         GLfloat fAspect;
118:     if(h == 0)
119:         h = 1;
120:     glViewport(0, 0, w, h);
121:     glMatrixMode(GL_PROJECTION);
122:     glLoadIdentity();
123:     fAspect = (GLfloat)w / (GLfloat)h;
124:     gluPerspective(35.0f, fAspect, 1.0f, 1000.0f);
125:     glMatrixMode(GL_MODELVIEW);
126:     glLoadIdentity();
127:     glTranslatef(0.0f, 0.0f, -400.0f);
128: }
129: int main(int argc, char* argv[])
130: {
131:         glutInit(&argc, argv);
132:         glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
133:         glutInitWindowSize(800,600);
134:         glutCreateWindow("RGB Cube");
135:         glutReshapeFunc(ChangeSize);
136:         glutSpecialFunc(SpecialKeys);
137:         glutDisplayFunc(RenderScene);
138:         SetupRC();
139:         glutMainLoop();
140: 
141:         return 0;
142: }