readreg.cpp

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/*
Reads a proprietary .reg input file, a simple ASCII format, 
and passes it to a blockConsumer.  Returns an 
error string on errors; returns NULL on sucess.

Orion Sky Lawlor, olawlor@acm.org, 4/29/2002
*/
#include <stdio.h>
#include "gridutil.h"

const char *read_reg(const char *regFile,blockConsumer &dest)
{
        //Open the input file
        FILE *in=fopen(regFile,"r");
        if (in==NULL) return "Couldn't open input .reg file";

        //Read the block size
        int dimArr[3];
        vector3d min,max;
        for (int axis=0;axis<3;axis++)
        {
                double m;
                if (1!=fscanf(in,"%d",&dimArr[axis]))
                        return "Couldn't read block dimension"; 
                if (1!=fscanf(in,"%lf",&m)) return "Couldn't read block min";
                min[axis]=m;
                if (1!=fscanf(in,"%lf",&m)) return "Couldn't read block max";
                max[axis]=m;
        }
        fclose(in);

        //Allocate return grid
        blockDim dim(dimArr[0],dimArr[1],dimArr[2]);
        vector3d *locs=dest.allocateBlock(dim);
        
        //Fill in the grid
        blockLoc i;
        blockSpan s(blockLoc(0,0,0),dim);
        BLOCKSPAN_FOR(i,s) {
                vector3d v;
                for (int axis=0;axis<3;axis++) {
                        double scl=i[axis]/(float)(dim[axis]-1);
                        v[axis]=min[axis]+scl*(max[axis]-min[axis]);
                }
                locs[dim[i]]=v;
        }
        
        dest.consume(dim,locs); 
        dest.freeBlock(locs);

        return NULL; //Everything worked
}