To display a set of {fij} values as a rectangular mesh

10. Program to display a set of values {fij} as a rectangular mesh.

#include<GL/glut.h>

#include<stdio.h>
static  GLdouble  viewer[]={0,0,5};
int  m, n;
void rectmesh( int  m, int  n)
{
            int  i, j;
            for(i=0;i<m;i++)
            for(j=0;j<n;j++)
            {
            glBegin(GL_LINE_LOOP);
            glVertex2i( i, j);
            glVertex2i( i+1, j);
            glVertex2i( i+1, j+1);
            glVertex2i( i, j+1);
            glEnd();
            }
}
void display()
{
            glClear(GL_COLOR_BUFFER_BIT);
            glLoadIdentity();
            gluLookAt(viewer[0],viewer[1],viewer[2],0,0,0,0,1,0);
            glTranslated(0,0,-5);
            glColor3f(0,0,0);
            rectmesh( m, n);
            glFlush();
}
void myReshape(int w,int h)
{
            glViewport(0,0,w,h);
            glMatrixMode(GL_PROJECTION);
            glLoadIdentity();
            glOrtho(-2,20,-2,20,-10,20);
            glMatrixMode(GL_MODELVIEW);
}
int main(int argc,char **argv)
{
printf(“enter m & n:”);
scanf(“%d%d”,&m,&n);
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize(500,500);
glutInitWindowPosition(0,0);
glutCreateWindow(“Rectangular Mesh”);
glutDisplayFunc(display);
glutReshapeFunc(myReshape);
glClearColor(1.0,1.0,1.0,1.0);
glutMainLoop();
return 0;
}