OpenGL txt File 이용해 그래픽 불러 들이기

Study/OpenGL

OpenGL txt File 이용해 그래픽 불러 들이기 - box

코딩하는 야구쟁이 2011. 9. 29. 10:14

8 (꼭지점의 갯수, 정수타입)
-1.0 -1.0 1.0
-1.0 1.0 1.0
1.0 1.0 1.0
1.0 -1.0 1.0
-1.0 -1.0 -1.0
-1.0 1.0 -1.0
1.0 1.0 -1.0
1.0 -1.0 -1.0

* 8개의 줄, 각각의 하나는 꼭지점의 x,y,z 값을 의미한다

6 (면의 갯수, 정수타입)
0 3 2 1
2 3 7 6
3 0 4 7
1 2 6 5
4 5 6 7
5 4 0 1

#include <gl/glut.h>       
#include <stdio.h>    
#include <math.h>    
#include <iostream> 
using namespace std;

#define PI 3.1415926   
#define M 36  
#define N 18

float radius = 1;   
float theta;   
float phi;  
float delta_theta;  
float delta_phi;

float cameraX = 3;  
float cameraY = 3; 
float cameraZ = 3;

struct POINT3D
{
	float x;
	float y;
	float z;
};

POINT3D *ver;

struct FACE4D  
{  
    int v1;
	int v2;
	int v3;
	int v4;
};

FACE4D *face;  
int v_no;
int f_no;

float color[][3] =
{
	(1.0, 1.0, 1.0), //흰색
	(1.0, 0.0, 0.0), //빨강색
	(0.0, 1.0, 0.0), //초록
	(0.0, 0.0, 1.0), //파랑
	(1.0, 1.0, 0.0), //노랑
	(0.0, 1.0, 1.0), //시안
	(1.0, 0.0, 1.0), //퍼플
	(0.5, 0.5, 0.5)  //회색 
};

void File_Load(void) //파일불러들이기
{
	char *filename;
	FILE *fp;
	
	int i;
	
	filename = "box.txt";
	fp = fopen(filename, "r");
	
	fscanf(fp, "%d", &(v_no));
	ver = new POINT3D[v_no];
	for(i=0;i<v_no;i++)
		fscanf(fp, "%f %f %f", &(ver[i].x), &(ver[i].y), &(ver[i].z));
    
    fscanf(fp, "%d", &(f_no));
	face = new FACE4D[f_no];
	for(i=0;i<f_no;i++)
		fscanf(fp, "%d %d %d %d", &(face[i].v1), &(face[i].v2), &(face[i].v3), &(face[i].v4));
}

void init (void)    
{    
    glClearColor (1.0, 1.0, 1.0, 0.0) ;        
    glColor3f(1.0, 1.0, 0.0);    
    glEnable(GL_DEPTH_TEST);    // 깊이 활성화   
	
	File_Load();
}

void reshape (int w, int h)    
{    
    glViewport(0, 0, w, h);    
    glMatrixMode (GL_PROJECTION);      
    glLoadIdentity();    
    //glOrtho (-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);    
    gluPerspective(45.0, 1.0, 1.0, 100.0 ); // 멀고 가까움을 표현함
}

void Draw_Box(void)
{
	int i;
	
	for(i=0;i<f_no;i++)
	{
		glBegin(GL_POLYGON);
		glColor3f(color[face[i].v1][0], color[face[i].v1][1], color[face[i].v1][2]);
		glVertex3f(ver[face[i].v1].x, ver[face[i].v1].y, ver[face[i].v1].z);
		glColor3f(color[face[i].v2][0], color[face[i].v2][1], color[face[i].v2][2]);
		glVertex3f(ver[face[i].v2].x, ver[face[i].v2].y, ver[face[i].v2].z);
		glColor3f(color[face[i].v3][0], color[face[i].v3][1], color[face[i].v3][2]);
		glVertex3f(ver[face[i].v3].x, ver[face[i].v3].y, ver[face[i].v3].z);
		glColor3f(color[face[i].v4][0], color[face[i].v4][1], color[face[i].v4][2]);
		glVertex3f(ver[face[i].v4].x, ver[face[i].v4].y, ver[face[i].v4].z);
		glEnd();
	}
}

void display (void)    
{    
	
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    
    glMatrixMode (GL_MODELVIEW);        
    glLoadIdentity();    
    gluLookAt(5.0, 5.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
	
    glBegin(GL_LINES);  // X, Y, Z 선 표시    
    glColor3f(1.0, 0.0, 0.0); // X축     
    glVertex3f(0.0, 0.0, 0.0);    
    glVertex3f(10.0, 0.0, 0.0);    
	
    glColor3f(0.0, 1.0, 0.0); // Y축     
    glVertex3f(0.0, 0.0, 0.0);    
    glVertex3f(0.0, 10.0, 0.0);    
	
    glColor3f(0.0, 0.0, 1.0); // Z축     
    glVertex3f(0.0, 0.0, 0.0);    
    glVertex3f(0.0, 0.0, 10.0);    
    glEnd();    
	
	Draw_Box();
    
    glFlush ();     
    glutSwapBuffers();    
}

void key(unsigned char key, int x, int y) 
{ 
    switch(key) 
    { 
    case 27: 
        exit(0); 
        break; 
    } 
}

void specialKey(int key, int x, int y) 
{  
    switch(key) 
    { 
    case GLUT_KEY_LEFT: 
        cameraX -= 1; 
        break; 
    case GLUT_KEY_RIGHT: 
        cameraX += 1; 
        break; 
    case GLUT_KEY_UP: 
        cameraY += 1; 
        break; 
    case GLUT_KEY_DOWN: 
        cameraY -= 1; 
        break; 
    } 
    //glutPostRedisplay(); 
}

void main (int argc, char** argv)    
{  
    glutInit (&argc, argv);     
    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );   
    glutInitWindowPosition (100, 100);     
    glutInitWindowSize (500, 500);    
    glutCreateWindow ("Cube");   
    init();  
    glutDisplayFunc (display);    
    glutReshapeFunc (reshape);   
    glutKeyboardFunc(key); 
    glutSpecialFunc(specialKey); 
    glutIdleFunc(display); 
    glutMainLoop();    
}

box[1].txt