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75 lines
2.6 KiB
75 lines
2.6 KiB
/*
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* Copyright(C) 1999-2020 National Technology & Engineering Solutions
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* of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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* NTESS, the U.S. Government retains certain rights in this software.
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*
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* See packages/seacas/LICENSE for details
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*/
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#include "smalloc.h" // for smalloc
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#include "structs.h" // for vtx_data
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/* Make coarse graph vertex coordinates be center-of-mass of their */
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/* fine graph constituents. */
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void makeccoords(struct vtx_data **graph, /* array of vtx data for graph */
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int cnvtxs, /* number of vertices in coarse graph */
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int * cv2v_ptrs, /* vtxs corresponding to each cvtx */
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int * cv2v_vals, /* indices into cv2v_vals */
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int igeom, /* dimensions of geometric data */
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float ** coords, /* coordinates for vertices */
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float ** ccoords /* coordinates for coarsened vertices */
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)
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{
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double mass; /* total mass of merged vertices */
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float *cptr; /* loops through ccoords */
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int cvtx; /* coarse graph vertex */
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int vtx; /* vertex being merged */
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int i, j; /* loop counters */
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for (i = 0; i < igeom; i++) {
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ccoords[i] = cptr = smalloc((cnvtxs + 1) * sizeof(float));
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for (cvtx = cnvtxs; cvtx; cvtx--) {
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*(++cptr) = 0;
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}
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}
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if (igeom == 1) {
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for (cvtx = 1; cvtx <= cnvtxs; cvtx++) {
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mass = 0;
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for (j = cv2v_ptrs[cvtx]; j < cv2v_ptrs[cvtx + 1]; j++) {
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vtx = cv2v_vals[j];
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mass += graph[vtx]->vwgt;
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ccoords[0][cvtx] += graph[vtx]->vwgt * coords[0][vtx];
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}
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ccoords[0][cvtx] /= mass;
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}
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}
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else if (igeom == 2) {
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for (cvtx = 1; cvtx <= cnvtxs; cvtx++) {
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mass = 0;
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for (j = cv2v_ptrs[cvtx]; j < cv2v_ptrs[cvtx + 1]; j++) {
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vtx = cv2v_vals[j];
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mass += graph[vtx]->vwgt;
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ccoords[0][cvtx] += graph[vtx]->vwgt * coords[0][vtx];
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ccoords[1][cvtx] += graph[vtx]->vwgt * coords[1][vtx];
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}
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ccoords[0][cvtx] /= mass;
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ccoords[1][cvtx] /= mass;
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}
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}
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else if (igeom > 2) {
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for (cvtx = 1; cvtx <= cnvtxs; cvtx++) {
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mass = 0;
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for (j = cv2v_ptrs[cvtx]; j < cv2v_ptrs[cvtx + 1]; j++) {
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vtx = cv2v_vals[j];
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mass += graph[vtx]->vwgt;
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ccoords[0][cvtx] += graph[vtx]->vwgt * coords[0][vtx];
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ccoords[1][cvtx] += graph[vtx]->vwgt * coords[1][vtx];
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ccoords[2][cvtx] += graph[vtx]->vwgt * coords[2][vtx];
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}
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ccoords[0][cvtx] /= mass;
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ccoords[1][cvtx] /= mass;
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ccoords[2][cvtx] /= mass;
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}
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}
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}
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