OpenGL - Drawing Polygons using data from text files

[midimatt]

Hello again,

i'm trying to make a program that draws a cube on the screen using data inside of a .txt file, this is the code that i've got so far, it compiles and runs but doesnt actualy display anything and i'm not really sure why. its probably something simple and i'm just too tired to see it.

any help would be greatly appreciated.

Here is the code.

#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include <gl/glut.h>
#include <stdio.h>

void drawCube();

float vertices [8][3];
int facets [6][4];



void read_file (char **argv);

void init(void)
{
    	glClearColor (0.0, 0.0, 0.0, 0.0);
    	glShadeModel (GL_FLAT);
}


void display(void)
{
        glClear(GL_COLOR_BUFFER_BIT);
	drawCube();
	glEnd();
	glFlush();
	glutSwapBuffers();    	
}
void reshape (int w, int h)
{
     	glViewport (0, 0, (GLsizei) w, (GLsizei) h);
     	glMatrixMode (GL_PROJECTION);
     	glLoadIdentity ();
     	gluPerspective(65.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
     	glMatrixMode(GL_MODELVIEW);
     	glLoadIdentity();
	glTranslatef (0.0, 0.0, -5.0);
}
int main(int argc, char** argv)
{
	read_file(argv);
	glutInit(&argc, argv);
	glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize (500, 500);
	glutInitWindowPosition (100, 100);
	glutCreateWindow (argv[0]);
	init ();
	glutDisplayFunc(display);
     	glutReshapeFunc(reshape);
     	glutKeyboardFunc(keyboard);
     	glutMainLoop();
     	return 0;
}

void drawCube()
{
	int i;
	glClear(GL_COLOR_BUFFER_BIT);
	glTranslatef(225.0f, 225.0f, 0.0f);
	glBegin(GL_POLYGON);

	for (i = 0; i < 6; ++i)
	{
		glVertex3fv(vertices[facets[i][0]]);
		glVertex3fv(vertices[facets[i][1]]);
		glVertex3fv(vertices[facets[i][2]]);
		glVertex3fv(vertices[facets[i][3]]);

	}
	
	glEnd();
	glFlush();
	glutSwapBuffers();

}
void read_file (char **argv)
{
	FILE *Map;
	int loopcounter;
	Map = fopen("Map.txt", "r");
	
	if (Map == NULL)
	{
		printf("\ncan't open input file\n");
		exit (1);
	}
	
	for (loopcounter = 0 ; loopcounter < 8 ; loopcounter++ )
	{
		fscanf(Map,"%f", &vertices[loopcounter][0]);
        	printf("%f ",vertices[loopcounter][0]);
        	
		fscanf(Map,"%f", &vertices[loopcounter][1]);
		printf("%f ",vertices[loopcounter][1]);
		
		fscanf(Map,"%f", &vertices[loopcounter][2]);
		printf("%f\n",vertices[loopcounter][2]);
	}
	
	for (loopcounter = 0 ; loopcounter < 6 ; loopcounter++ )
	{
		fscanf(Map,"%d", &facets[loopcounter][0]);
		printf("%d ",facets[loopcounter][0]);
		
		fscanf(Map,"%d", &facets[loopcounter][1]);
		printf("%d ",facets[loopcounter][1]);
		
		fscanf(Map,"%d", &facets[loopcounter][2]);
		printf("%d ",facets[loopcounter][2]);
		
		fscanf(Map,"%d", &facets[loopcounter][3]);
		printf("%d\n",facets[loopcounter][3]);
	}
}

and here is the data stored in the text file.

-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
0 
3
2
1
2
3
7
6
0
4
7
3
1
2
6
5
4
5
6
7
0 1 5 4

Thanks in Advance

[midimatt]

Solved:

Programming at 4am in morning is bound to produce stupid mistakes :(

removed glTranslatef(225.0f, 225.0f, 0.0f); and it worked perfectly.