ann2fig.cpp

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//----------------------------------------------------------------------
// File:                        ann2fig.cpp
// Programmer:          David Mount
// Last modified:       05/03/05
// Description:         convert ann dump file to fig file
//----------------------------------------------------------------------
// Copyright (c) 1997-2005 University of Maryland and Sunil Arya and
// David Mount.  All Rights Reserved.
//
// This software and related documentation is part of the Approximate
// Nearest Neighbor Library (ANN).  This software is provided under
// the provisions of the Lesser GNU Public License (LGPL).  See the
// file ../ReadMe.txt for further information.
//
// The University of Maryland (U.M.) and the authors make no
// representations about the suitability or fitness of this software for
// any purpose.  It is provided "as is" without express or implied
// warranty.
//----------------------------------------------------------------------
// History:
//      Revision 0.1  03/04/98
//              Initial release
//      Revision 1.0  04/01/05
//              Changed dump file suffix from .ann to .dmp.
//      Revision 1.1  05/03/05
//              Fixed usage output string.
//----------------------------------------------------------------------
//      This program inputs an ann dump file of a search structure
//      perhaps along with point coordinates, and outputs a fig (Ver 3.1)
//      file (see fig2dev (1)) displaying the tree.  The fig file may
//      then be displayed using xfig, or converted to any of a number of
//      other formats using fig2dev.
//
//      If the dimension is 2 then the entire tree is display.  If the
//      dimension is larger than 2 then the user has the option of
//      selecting which two dimensions will be displayed, and the slice
//      value for each of the remaining dimensions.  All leaf cells
//      intersecting the slice are shown along with the points in these
//      cells. See the procedure getArgs() below for the command-line
//      arguments.
//----------------------------------------------------------------------

#include <cstdio>                                               // C standard I/O
#include <cstdlib>                                              // standard lib defs
#include <cstring>                                              // C strings
#include <fstream>                                              // file I/O
#include <string>                                               // string manipulation
#include <ANN/ANNx.h>                                   // all ANN includes

using namespace std;                                    // make std:: accessible

//----------------------------------------------------------------------
// Globals and their defaults
//----------------------------------------------------------------------

const int               STRING_LEN              = 500;  // string lengths
const int               MAX_DIM                 = 1000; // maximum dimension
const double    DEF_SLICE_VAL   = 0;    // default slice value
const char              FIG_HEAD[]              = {"#FIG 3.1"}; // fig file header
const char              DUMP_SUFFIX[]   = {".dmp"};     // suffix for dump file
const char              FIG_SUFFIX[]    = {".fig"};     // suffix for fig file

char                    file_name[STRING_LEN];  // (root) file name (say xxx)
char                    infile_name[STRING_LEN];// input file name (xxx.dmp)
char                    outfile_name[STRING_LEN];// output file name (xxx.fig)
char                    caption[STRING_LEN];    // caption line (= command line)
ofstream                ofile;                                  // output file stream
ifstream                ifile;                                  // input file stream
int                             dim_x = 0;                              // horizontal dimension
int                             dim_y = 1;                              // vertical dimension
double                  slice_val[MAX_DIM];             // array of slice values
double                  u_per_in = 1200;                // fig units per inch (version 3.1)
double                  in_size = 5;                    // size of figure (in inches)
double                  in_low_x = 1;                   // fig upper left corner (in inches)
double                  in_low_y = 1;                   // fig upper left corner (in inches)
double                  u_size = 6000;                  // size of figure (in units)
double                  u_low_x = 1200;                 // fig upper left corner (in units)
double                  u_low_y = 1200;                 // fig upper left corner (in units)
int                             pt_size = 10;                   // point size (in fig units)

int                             dim;                                    // dimension
int                             n_pts;                                  // number of points
ANNpointArray   pts = NULL;                             // point array

double                  scale;                                  // scale factor for transformation
double                  offset_x;                               // offsets for transformation
double                  offset_y;

                                                                                // transformations
#define TRANS_X(p)              (offset_x + scale*(p[dim_x]))
#define TRANS_Y(p)              (offset_y - scale*(p[dim_y]))

//----------------------------------------------------------------------
//      Error handler
//----------------------------------------------------------------------

void Error(const char* msg, ANNerr level)
{
        if (level == ANNabort) {
                cerr << "ann2fig: ERROR------->" << msg << "<-------------ERROR\n";
                exit(1);
        }
        else {
                cerr << "ann2fig: WARNING----->" << msg << "<-------------WARNING\n";
        }
}

//----------------------------------------------------------------------
// set_slice_val - set all slice values to given value
//----------------------------------------------------------------------

void set_slice_val(double val)
{
        for (int i = 0; i < MAX_DIM; i++) {
                slice_val[i] = val;
        }
}

//----------------------------------------------------------------------
// getArgs - get input arguments
//
//              Syntax:
//              ann2fig [-upi scale] [-x low_x] [-y low_y]
//                              [-sz size] [-dx dim_x] [-dy dim_y] [-sl dim value]*
//                              [-ps pointsize]
//                              file
//
//              where:
//                      -upi scale                      fig units per inch (default = 1200)
//                      -x low_x                        x and y offset of upper left corner (inches)
//                      -y low_y                        ...(default = 1)
//                      -sz size                        maximum side length of figure (in inches)
//                                                              ...(default = 5)
//                      -dx dim_x                       horizontal dimension (default = 0)
//                      -dy dim_y                       vertical dimension (default = 1)
//                      -sv value                       default slice value (default = 0)
//                      -sl dim value           each such pair defines the value along the
//                                                              ...given dimension at which to slice.  This
//                                                              ...may be supplied for all dimensions except
//                                                              ...dim_x and dim_y.
//                      -ps pointsize           size of points in fig units (def = 10)
//                      file                            file (input=file.dmp, output=file.fig)
//
//----------------------------------------------------------------------

void getArgs(int argc, char **argv)
{
        int i;
        int sl_dim;                                                                     // temp slice dimension
        double sl_val;                                                          // temp slice value

        set_slice_val(DEF_SLICE_VAL);                           // set initial slice-values

        if (argc <= 1) {
                cerr << "Syntax:\n\
        ann2fig [-upi scale] [-x low_x] [-y low_y]\n\
                [-sz size] [-dx dim_x] [-dy dim_y] [-sl dim value]*\n\
                file\n\
        \n\
        where:\n\
            -upi scale          fig units per inch (default = 1200)\n\
            -x low_x            x and y offset of upper left corner (inches)\n\
            -y low_y            ...(default = 1)\n\
            -sz size            maximum side length of figure (in inches)\n\
                                ...(default = 5)\n\
            -dx dim_x           horizontal dimension (default = 0)\n\
            -dy dim_y           vertical dimension (default = 1)\n\
            -sv value           default slice value (default = 0)\n\
            -sl dim value       each such pair defines the value along the\n\
                                ...given dimension at which to slice.  This\n\
                                ...may be supplied for each dimension except\n\
                                ...dim_x and dim_y.\n\
            -ps pointsize       size of points in fig units (def = 10)\n\
            file                file (input=file.dmp, output=file.fig)\n";
                exit(0);
        }

        ANNbool fileSeen = ANNfalse;                            // file argument seen?

        for (i = 1; i < argc; i++) {
                if (!strcmp(argv[i], "-upi")) {                 // process -upi option
                        sscanf(argv[++i], "%lf", &u_per_in);
                }
                else if (!strcmp(argv[i], "-x")) {              // process -x option
                        sscanf(argv[++i], "%lf", &in_low_x);
                }
                else if (!strcmp(argv[i], "-y")) {              // process -y option
                        sscanf(argv[++i], "%lf", &in_low_y);
                }
                else if (!strcmp(argv[i], "-sz")) {             // process -sz option
                        sscanf(argv[++i], "%lf", &in_size);
                }
                else if (!strcmp(argv[i], "-dx")) {             // process -dx option
                        sscanf(argv[++i], "%d", &dim_x);
                }
                else if (!strcmp(argv[i], "-dy")) {             // process -dy option
                        sscanf(argv[++i], "%d", &dim_y);
                }
                else if (!strcmp(argv[i], "-sv")) {             // process -sv option
                        sscanf(argv[++i], "%lf", &sl_val);
                        set_slice_val(sl_val);                          // set slice values
                }
                else if (!strcmp(argv[i], "-sl")) {             // process -sl option
                        sscanf(argv[++i], "%d", &sl_dim);
                        if (sl_dim < 0 || sl_dim >= MAX_DIM) {
                                Error("Slice dimension out of bounds", ANNabort);
                        }
                        sscanf(argv[++i], "%lf", &slice_val[sl_dim]);
                }
                if (!strcmp(argv[i], "-ps")) {                  // process -ps option
                        sscanf(argv[++i], "%i", &pt_size);
                }
                else {                                                                  // must be file name
                        fileSeen = ANNtrue;
                        sscanf(argv[i], "%s", file_name);
                        strcpy(infile_name, file_name);         // copy to input file name
                strcat(infile_name, DUMP_SUFFIX);
                strcpy(outfile_name, file_name);        // copy to output file name
                strcat(outfile_name, FIG_SUFFIX);
                }
        }

        if (!fileSeen) {                                                        // no file seen
                Error("File argument is required", ANNabort);
        }

        ifile.open(infile_name, ios::in);                       // open for reading
        if (!ifile) {
                Error("Cannot open input file", ANNabort);
        }
        ofile.open(outfile_name, ios::out);                     // open for writing
        if (!ofile) {
                Error("Cannot open output file", ANNabort);
        }

        u_low_x = u_per_in * in_low_x;                          // convert inches to fig units
        u_low_y = u_per_in * in_low_y;
        u_size  = u_per_in * in_size;

        strcpy(caption, argv[0]);                                       // copy command line to caption
        for (i = 1; i < argc; i++) {
                strcat(caption, " ");
                strcat(caption, argv[i]);
        }
}

//----------------------------------------------------------------------
// Graphics utilities for fig output
//
//              writeHeader                             write header for fig file
//              writePoint                              write a point
//              writeBox                                write a box
//              writeLine                               write a line
//----------------------------------------------------------------------

void writeHeader()
{
        ofile << FIG_HEAD << "\n"                                       // fig file header
                 << "Portrait\n"
                 << "Center\n"
                 << "Inches\n"
                 << (int) u_per_in << " 2\n";
}

void writePoint(ANNpoint p)                                             // write a single point
{
                                                                                                // filled black point object
        ofile << "1 3 0 1 -1 7 0 0 0 0.000 1 0.0000 ";
        int cent_x = (int) TRANS_X(p);                          // transform center coords
        int cent_y = (int) TRANS_Y(p);
        ofile << cent_x << " " << cent_y << " "         // write center, radius, bounds
                 << pt_size << " " << pt_size << " "
                 << cent_x << " " << cent_y << " "
                 << cent_x + pt_size << " " << cent_y + pt_size << "\n";
}

void writeBox(const ANNorthRect &r)                             // write box
{
                                                                                                // unfilled box object
        ofile << "2 2 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 5\n";

        int p0_x = (int) TRANS_X(r.lo);                         // transform endpoints
        int p0_y = (int) TRANS_Y(r.lo);
        int p1_x = (int) TRANS_X(r.hi);
        int p1_y = (int) TRANS_Y(r.hi);
        ofile << "\t"
                 << p0_x << " " << p0_y << " "                  // write vertices
                 << p1_x << " " << p0_y << " "
                 << p1_x << " " << p1_y << " "
                 << p0_x << " " << p1_y << " "
                 << p0_x << " " << p0_y << "\n";
}

void writeLine(ANNpoint p0, ANNpoint p1)                // write line
{
                                                                                                // unfilled line object
        ofile << "2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2\n";

        int p0_x = (int) TRANS_X(p0);                           // transform endpoints
        int p0_y = (int) TRANS_Y(p0);
        int p1_x = (int) TRANS_X(p1);
        int p1_y = (int) TRANS_Y(p1);
        ofile << "\t"
                 << p0_x << " " << p0_y << " "                  // write vertices
                 << p1_x << " " << p1_y << "\n";
}

void writeCaption(                                                              // write caption text
        const ANNorthRect       &bnd_box,                               // bounding box
        char                            *caption)                               // caption
{
        if (!strcmp(caption, "\0")) return;                     // null string?
        int px = (int) TRANS_X(bnd_box.lo);                     // put .5 in. lower left
        int py = (int) (TRANS_Y(bnd_box.lo) + 0.50 * u_per_in);
        ofile << "4 0 -1 0 0 0 20 0.0000 4 255 2000 ";
        ofile << px << " " << py << " " << caption << "\\001\n";
}

//----------------------------------------------------------------------
// overlap - test whether a box overlap slicing region
//
//              The slicing region is a 2-dimensional plane in space
//              which contains points (x1, x2, ..., xn) satisfying the
//              n-2 linear equalities:
//
//                                              xi == slice_val[i]              for i != dim_x, dim_y
//
//              This procedure returns true of the box defined by
//              corner points box.lo and box.hi overlap this plane.
//----------------------------------------------------------------------

ANNbool overlap(const ANNorthRect &box)
{
        for (int i = 0; i < dim; i++) {
                if (i != dim_x && i != dim_y &&
                   (box.lo[i] > slice_val[i] || box.hi[i] < slice_val[i]))
                        return ANNfalse;
        }
        return ANNtrue;
}

//----------------------------------------------------------------------
// readTree, recReadTree - inputs tree and outputs figure
//
//              readTree procedure initializes things and then calls recReadTree
//              which does all the work.
//
//              recReadTree reads in a node of the tree, makes any recursive
//              calls as needed to input the children of this node (if internal)
//              and maintains the bounding box.  Note that the bounding box
//              is modified within this procedure, but it is the responsibility
//              of the procedure that it be restored to its original value
//              on return.
//
//              Recall that these are the formats.  The tree is given in
//              preorder.
//
//              Leaf node:
//                              leaf <n_pts> <bkt[0]> <bkt[1]> ... <bkt[n-1]>
//              Splitting nodes:
//                              split <cut_dim> <cut_val> <lo_bound> <hi_bound>
//              Shrinking nodes:
//                              shrink <n_bnds>
//                                              <cut_dim> <cut_val> <side>
//                                              <cut_dim> <cut_val> <side>
//                                              ... (repeated n_bnds times)
//
//              On reading a leaf we determine whether we should output the
//              cell's points (if dimension = 2 or this cell overlaps the
//              slicing region).  For splitting nodes we check whether the
//              current cell overlaps the slicing plane and whether the
//              cutting dimension coincides with either the x or y drawing
//              dimensions.  If so, we output the corresponding splitting
//              segment.
//----------------------------------------------------------------------

void recReadTree(ANNorthRect &box)
{
        char tag[STRING_LEN];                                           // tag (leaf, split, shrink)
        int n_pts;                                                                      // number of points in leaf
        int idx;                                                                        // point index
        int cd;                                                                         // cut dimension
        ANNcoord cv;                                                            // cut value
        ANNcoord lb;                                                            // low bound
        ANNcoord hb;                                                            // high bound
        int n_bnds;                                                                     // number of bounding sides
        int sd;                                                                         // which side

        ifile >> tag;                                                           // input node tag
        if (strcmp(tag, "leaf") == 0) {                         // leaf node

                ifile >> n_pts;                                                 // input number of points
                                                                                                // check for overlap
                if (dim == 2 || overlap(box)) {
                        for (int i = 0; i < n_pts; i++) {       // yes, write the points
                                ifile >> idx;
                                writePoint(pts[idx]);
                        }
                }
                else {                                                                  // input but ignore points
                        for (int i = 0; i < n_pts; i++) {
                                ifile >> idx;
                        }
                }
        }
        else if (strcmp(tag, "split") == 0) {           // splitting node

                ifile >> cd >> cv >> lb >> hb;
                if (lb != box.lo[cd] || hb != box.hi[cd]) {
                        Error("Bounding box coordinates are fishy", ANNwarn);
                }

                ANNcoord lv = box.lo[cd];                               // save bounds for cutting dim
                ANNcoord hv = box.hi[cd];

                //--------------------------------------------------------------
                //      The following code is rather fragile so modify at your
                //      own risk.  We first decrease the high-end of the bounding
                //      box down to the cutting plane and then read the left subtree.
                //      Then we increase the low-end of the bounding box up to the
                //      cutting plane (thus collapsing the bounding box to a d-1
                //      dimensional hyperrectangle).  Then we draw the projection of
                //      its diagonal if it crosses the slicing plane.  This will have
                //      the effect of drawing its intersection on the slicing plane.
                //      Then we restore the high-end of the bounding box and read
                //      the right subtree.  Finally we restore the low-end of the
                //      bounding box, before returning.
                //--------------------------------------------------------------
                box.hi[cd] = cv;                                                // decrease high bounds
                recReadTree(box);                                               // read left subtree
                                                                                                // check for overlap
                box.lo[cd] = cv;                                                // increase low bounds
                if (dim == 2 || overlap(box)) {                 // check for overlap
                        if (cd == dim_x || cd == dim_y) {       // cut through slice plane
                                writeLine(box.lo, box.hi);              // draw cutting line
                        }
                }
                box.hi[cd] = hv;                                                // restore high bounds

                recReadTree(box);                                               // read right subtree
                box.lo[cd] = lv;                                                // restore low bounds
        }
        else if (strcmp(tag, "shrink") == 0) {          // splitting node

                ANNorthRect inner(dim, box);                    // copy bounding box
                ifile >> n_bnds;                                                // number of bounding sides
                for (int i = 0; i < n_bnds; i++) {
                        ifile >> cd >> cv >> sd;                        // input bounding halfspace
                        ANNorthHalfSpace hs(cd, cv, sd);        // create orthogonal halfspace
                        hs.project(inner.lo);                           // intersect by projecting
                        hs.project(inner.hi);
                }
                if (dim == 2 || overlap(inner)) {
                        writeBox(inner);                                        // draw inner rectangle
                }
                recReadTree(inner);                                             // read inner subtree
                recReadTree(box);                                               // read outer subtree
        }
        else {
                Error("Illegal node type in dump file", ANNabort);
        }
}

void readTree(ANNorthRect &bnd_box)
{
        writeHeader();                                                          // output header
        writeBox(bnd_box);                                                      // draw bounding box
        writeCaption(bnd_box, caption);                         // write caption
        recReadTree(bnd_box);                                           // do it
}

//----------------------------------------------------------------------
// readANN - read the ANN dump file
//
//              This procedure reads in the dump file.  See the format below.
//              It first reads the header line with version number.  If the
//              points section is present it reads them (otherwise just leaves
//              points = NULL), and then it reads the tree section.  It inputs
//              the bounding box and determines the parameters for transforming
//              the image to figure units.  It then invokes the procedure
//              readTree to do all the real work.
//
//              Dump File Format: <xxx> = coordinate value (ANNcoord)
//
//              #ANN <version number> <comments> [END_OF_LINE]
//              points <dim> <n_pts>                    (point coordinates: this is optional)
//              0 <xxx> <xxx> ... <xxx>                 (point indices and coordinates)
//              1 <xxx> <xxx> ... <xxx>
//                ...
//              tree <dim> <n_pts> <bkt_size>
//              <xxx> <xxx> ... <xxx>                   (lower end of bounding box)
//              <xxx> <xxx> ... <xxx>                   (upper end of bounding box)
//                              If the tree is null, then a single line "null" is
//                              output.  Otherwise the nodes of the tree are printed
//                              one per line in preorder.  Leaves and splitting nodes
//                              have the following formats:
//              Leaf node:
//                              leaf <n_pts> <bkt[0]> <bkt[1]> ... <bkt[n-1]>
//              Splitting nodes:
//                              split <cut_dim> <cut_val> <lo_bound> <hi_bound>
//              Shrinking nodes:
//                              shrink <n_bnds>
//                                              <cut_dim> <cut_val> <side>
//                                              <cut_dim> <cut_val> <side>
//                                              ... (repeated n_bnds times)
//
//              Note: Infinite lo_ and hi_bounds are printed as the special
//                              values "-INF" and "+INF", respectively.  We do not
//                              check for this, because the current version of ANN
//                              starts with a finite bounding box if the tree is
//                              nonempty.
//----------------------------------------------------------------------

void readANN()
{
        int j;
        char str[STRING_LEN];                                           // storage for string
    char version[STRING_LEN];                                   // storage for version
        int  bkt_size;                                                          // bucket size

        ifile >> str;                                                           // input header
        if (strcmp(str, "#ANN") != 0) {                         // incorrect header
                Error("Incorrect header for dump file", ANNabort);
        }
    ifile.getline(version, STRING_LEN);                 // get version (ignore)
        ifile >> str;                                                           // get major heading
        if (strcmp(str, "points") == 0) {                       // points section
                ifile >> dim;                                                   // read dimension
                ifile >> n_pts;                                                 // number of points
                pts = annAllocPts(n_pts, dim);                  // allocate points
                for (int i = 0; i < n_pts; i++) {               // input point coordinates
                        int idx;                                                        // point index
                        ifile >> idx;                                           // input point index
                        if (idx < 0 || idx >= n_pts) {
                                Error("Point index is out of range", ANNabort);
                        }
                        for (j = 0; j < dim; j++) {
                                ifile >> pts[idx][j];                   // read point coordinates
                        }
                }
                ifile >> str;                                                   // get next major heading
        }
        if (strcmp(str, "tree") == 0) {                         // tree section
                ifile >> dim;                                                   // read dimension
                if (dim_x > dim || dim_y > dim) {
                        Error("Dimensions out of bounds", ANNabort);
                }
                ifile >> n_pts;                                                 // number of points
                ifile >> bkt_size;                                              // bucket size (ignored)
                                                                                                // read bounding box
                ANNorthRect bnd_box(dim);                               // create bounding box
                for (j = 0; j < dim; j++) {
                        ifile >> bnd_box.lo[j];                         // read box low coordinates
                }
                for (j = 0; j < dim; j++) {
                        ifile >> bnd_box.hi[j];                         // read box high coordinates
                }
                                                                                                // compute scaling factors
                double box_len_x = bnd_box.hi[dim_x] - bnd_box.lo[dim_x];
                double box_len_y = bnd_box.hi[dim_y] - bnd_box.lo[dim_y];
                                                                                                // longer side determines scale
                if (box_len_x > box_len_y) scale = u_size/box_len_x;
                else                                       scale = u_size/box_len_y;
                                                                                                // compute offsets
                offset_x = u_low_x - scale*bnd_box.lo[dim_x];
                offset_y = u_low_y + scale*bnd_box.hi[dim_y];
                readTree(bnd_box);                                              // read the tree and process
        }
        else if (strcmp(str, "null") == 0) return;      // empty tree
        else {
                cerr << "Input string: " << str << "\n";
                Error("Illegal ann format.  Expecting section heading", ANNabort);
        }
}

//----------------------------------------------------------------------
// Main program
//
// Gets the command-line arguments and invokes the main scanning
// procedure.
//----------------------------------------------------------------------

main(int argc, char **argv)
{
        getArgs(argc, argv);                                            // get input arguments
        readANN();                                                                      // read the dump file
}