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Shaker.c

/* 
A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* copyright 1998-2000 by Warren Lyford Delano of DeLano Scientific. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
-* 
-* 
-*
Z* -------------------------------------------------------------------
*/

#include"os_predef.h"
#include"os_std.h"
#include"os_gl.h"
#include"Base.h"
#include"OOMac.h"
#include"CGO.h"

#include"Map.h"

#include"Shaker.h"

CShaker *ShakerNew(PyMOLGlobals * G)
{
  OOAlloc(G, CShaker);
  I->G = G;
  I->DistCon = VLAlloc(ShakerDistCon, 1000);
  I->PyraCon = VLAlloc(ShakerPyraCon, 1000);
  I->PlanCon = VLAlloc(ShakerPlanCon, 1000);
  I->TorsCon = VLAlloc(ShakerTorsCon, 1000);
  I->LineCon = VLAlloc(ShakerLineCon, 100);
  I->NDistCon = 0;
  I->NPyraCon = 0;
  I->NPlanCon = 0;
  I->NLineCon = 0;
  I->NTorsCon = 0;
  return (I);
}

void ShakerReset(CShaker * I)
{
  I->NDistCon = 0;
  I->NPyraCon = 0;
  I->NPlanCon = 0;
  I->NLineCon = 0;
  I->NTorsCon = 0;
}

#if 0

/* this code moved into Sculpt.c */

float ShakerDoDist(float target, float *v0, float *v1, float *d0to1, float *d1to0,
                   float wt)
{
  float d[3], push[3];
  float len, dev, dev_2, sc, result;

  subtract3f(v0, v1, d);
  len = (float) length3f(d);
  dev = target - len;
  if((result = fabs(dev)) > R_SMALL8) {
    dev_2 = wt * dev * 0.5F;
    if(len > R_SMALL8) {        /* nonoverlapping */
      sc = dev_2 / len;
      scale3f(d, sc, push);
      add3f(push, d0to1, d0to1);
      subtract3f(d1to0, push, d1to0);
    } else {                    /* overlapping, so just push in a random direction */
      float rd[3];
      get_random3f(rd);
      d0to1[0] -= rd[0] * dev_2;
      d1to0[0] += rd[0] * dev_2;
      d0to1[1] -= rd[1] * dev_2;
      d1to0[1] += rd[1] * dev_2;
      d0to1[2] -= rd[2] * dev_2;
      d1to0[2] += rd[2] * dev_2;
    }
  } else
    result = 0.0;
  return result;
}

float ShakerDoDistLimit(float target, float *v0, float *v1, float *d0to1, float *d1to0,
                        float wt)
{
  float d[3], push[3];
  float len, dev, dev_2, sc;

  if(wt == 0.0F)
    return 0.0F;
  subtract3f(v0, v1, d);
  len = (float) length3f(d);
  dev = target - len;
  if(dev < 0.0F) {              /* assuming len is non-zero since it is above target */
    dev_2 = wt * dev * 0.5F;
    sc = dev_2 / len;
    scale3f(d, sc, push);
    add3f(push, d0to1, d0to1);
    subtract3f(d1to0, push, d1to0);
    return -dev;
  } else
    return 0.0F;
}

#endif

void ShakerAddDistCon(CShaker * I, int atom0, int atom1, float target, int type, float wt)
{
  ShakerDistCon *sdc;

  VLACheck(I->DistCon, ShakerDistCon, I->NDistCon);
  sdc = I->DistCon + I->NDistCon;
  sdc->at0 = atom0;
  sdc->at1 = atom1;
  sdc->targ = target;
  sdc->type = type;
  sdc->weight = wt;
  I->NDistCon++;
}

float ShakerGetPyra(float *targ2, float *v0, float *v1, float *v2, float *v3)
{
  float d0[3], cp[3], d2[3], d3[3];
  float av[3], t0[3];

  add3f(v1, v2, av);
  subtract3f(v2, v1, d2);
  add3f(v3, av, av);
  subtract3f(v3, v1, d3);
  subtract3f(av, v0, t0);
  cross_product3f(d2, d3, cp);
  scale3f(av, 0.33333333F, av);
  normalize3f(cp);
  subtract3f(av, v0, d0);

  (*targ2) = length3f(d0);
  return (dot_product3f(d0, cp));
}

float ShakerDoPyra(float targ1, float targ2,
                   float *v0, float *v1, float *v2, float *v3,
                   float *p0, float *p1, float *p2, float *p3, float wt, float inv_wt)
{
  float d0[3], cp[3], d2[3], d3[3];
  float av[3], t0[3], push[3];

  float cur, dev, sc, result1, result2 = 0.0F;

  add3f(v1, v2, av);
  subtract3f(v2, v1, d2);
  add3f(v3, av, av);
  subtract3f(v3, v1, d3);
  subtract3f(av, v0, t0);
  cross_product3f(d2, d3, cp);
  scale3f(av, 0.33333333F, av);
  normalize3f(cp);
  subtract3f(av, v0, d0);

  cur = dot_product3f(d0, cp);
  dev = cur - targ1;
  result1 = (float) fabs(dev);
  if(result1 > R_SMALL8) {
    sc = wt * dev;
    if((cur * targ1) < 0.0)     /* inverted */
      sc = sc * inv_wt;         /* inversion fixing weight */
    scale3f(cp, sc, push);
    add3f(push, p0, p0);
    scale3f(push, 0.333333F, push);
    subtract3f(p1, push, p1);
    subtract3f(p2, push, p2);
    subtract3f(p3, push, p3);
  }

  if((targ2 >= 0.0F) && ((cur * targ1 > 0.0) || (fabs(targ1) < 0.1))) {
    /* so long as we're not inverted...
       also make sure v0 is the right distance from the average point */
    cur = length3f(d0);
    normalize3f(d0);
    dev = cur - targ2;
    result2 = (float) fabs(dev);
    if(result2 > R_SMALL4) {
      sc = wt * dev * 2.0F;
      scale3f(d0, sc, push);
      add3f(push, p0, p0);
      scale3f(push, 0.333333F, push);
      subtract3f(p1, push, p1);
      subtract3f(p2, push, p2);
      subtract3f(p3, push, p3);
    }
  }

  return result1 + result2;
}

float ShakerDoLine(float *v0, float *v1, float *v2,
                   float *p0, float *p1, float *p2, float wt)
{
  /* v0-v1-v2 */

  float d0[3], d1[3], cp[3], d2[3], d3[3], d4[3], push[3];
  float dev, sc, lcp, result;

  subtract3f(v2, v1, d2);
  subtract3f(v0, v1, d1);
  normalize3f(d2);
  normalize23f(d1, d0);

  cross_product3f(d2, d0, cp);
  lcp = (float) length3f(cp);
  if(lcp > R_SMALL4) {
    lcp = 1.0F / lcp;
    scale3f(cp, lcp, cp);       /* axis 0 */

    subtract3f(v2, v0, d3);
    normalize3f(d3);            /* axis 1 */

    cross_product3f(cp, d3, d4);
    normalize3f(d4);            /* displacement direction */

    dev = dot_product3f(d1, d4);        /* current deviation */

    if((result = (float) fabs(dev)) > R_SMALL8) {
      sc = wt * dev;
      scale3f(d4, sc, push);
      add3f(push, p1, p1);
      scale3f(push, 0.5F, push);
      subtract3f(p0, push, p0);
      subtract3f(p2, push, p2);
    } else {
      result = 0.0;
    }
  } else
    result = 0.0;
  return result;

}

float ShakerDoPlan(float *v0, float *v1, float *v2, float *v3,
                   float *p0, float *p1, float *p2, float *p3,
                   float target, int fixed, float wt)
{

  float result;

  float d01[3], d12[3], d23[3], d03[3], cp0[3], cp1[3], dp, sc, dev, d0[3], push[3];
  double s01, s12, s23, s03;

  subtract3f(v0, v1, d01);
  subtract3f(v1, v2, d12);
  subtract3f(v2, v3, d23);
  subtract3f(v0, v3, d03);

  s03 = lengthsq3f(d03);
  s01 = lengthsq3f(d01);
  s12 = lengthsq3f(d12);
  s23 = lengthsq3f(d23);

  if((s03 < s01) || (s03 < s12) || (s03 < s23))
    return 0.0F;

  cross_product3f(d01, d12, cp0);
  cross_product3f(d12, d23, cp1);

  normalize3f(cp0);
  normalize3f(cp1);

  dp = dot_product3f(cp0, cp1);

  result = (dev = 1.0F - (float) fabs(dp));

  if(dev > R_SMALL4) {

    /*
       add3f(cp0,cp1,d0);
       normalize3f(d0);

       cross_product3f(cp0,d12,pos);
       dp2 = dot_product3f(cp1,pos);
     */

    if(fixed && (dp * target < 0.0F)) {

      /* fixed & backwards... */

      if(dp < 0.0F) {
        sc = -wt * dev * 0.5F;
      } else {
        sc = wt * dev * 0.5F;
      }
      sc *= 0.02F;              /* weaken considerably to allow resolution of
                                   inconsistencies (folded rings, etc.) */

    } else if(dp > 0) {
      sc = -wt * dev * 0.5F;
    } else {
      sc = wt * dev * 0.5F;
    }

    if(fixed && (fixed < 7)) {
      /* in small rings, ramp up the planarity factor */
      sc *= 8;
    } else {
      sc *= 0.2F;
    }

    /* pair-wise nudges */

    subtract3f(v0, v3, d0);
    normalize3f(d0);
    scale3f(d0, sc, push);
    add3f(push, p0, p0);
    subtract3f(p3, push, p3);

    subtract3f(v1, v2, d0);
    normalize3f(d0);
    scale3f(d0, sc, push);
    add3f(push, p1, p1);
    subtract3f(p2, push, p2);

    sc = -sc;
    subtract3f(v0, v2, d0);
    normalize3f(d0);
    scale3f(d0, sc, push);
    add3f(push, p0, p0);
    subtract3f(p2, push, p2);

    subtract3f(v1, v3, d0);
    normalize3f(d0);
    scale3f(d0, sc, push);
    add3f(push, p1, p1);
    subtract3f(p3, push, p3);

  } else {
    result = 0.0;
  }
  return result;

}

void ShakerAddPyraCon(CShaker * I, int atom0, int atom1, int atom2, int atom3,
                      float targ1, float targ2)
{
  ShakerPyraCon *spc;

  VLACheck(I->PyraCon, ShakerPyraCon, I->NPyraCon);
  spc = I->PyraCon + I->NPyraCon;
  spc->at0 = atom0;
  spc->at1 = atom1;
  spc->at2 = atom2;
  spc->at3 = atom3;
  spc->targ1 = targ1;
  spc->targ2 = targ2;
  I->NPyraCon++;
}

void ShakerAddTorsCon(CShaker * I, int atom0, int atom1, int atom2, int atom3, int type)
{
  ShakerTorsCon *stc;

  VLACheck(I->TorsCon, ShakerTorsCon, I->NTorsCon);
  stc = I->TorsCon + I->NTorsCon;
  stc->at0 = atom0;
  stc->at1 = atom1;
  stc->at2 = atom2;
  stc->at3 = atom3;
  stc->type = type;
  I->NTorsCon++;

}

void ShakerAddPlanCon(CShaker * I, int atom0, int atom1, int atom2, int atom3,
                      float target, int fixed)
{
  ShakerPlanCon *spc;

  VLACheck(I->PlanCon, ShakerPlanCon, I->NPlanCon);
  spc = I->PlanCon + I->NPlanCon;
  spc->at0 = atom0;
  spc->at1 = atom1;
  spc->at2 = atom2;
  spc->at3 = atom3;
  spc->fixed = fixed;
  spc->target = target;
  I->NPlanCon++;
}

void ShakerAddLineCon(CShaker * I, int atom0, int atom1, int atom2)
{
  ShakerLineCon *slc;

  VLACheck(I->LineCon, ShakerLineCon, I->NLineCon);
  slc = I->LineCon + I->NLineCon;
  slc->at0 = atom0;
  slc->at1 = atom1;
  slc->at2 = atom2;
  I->NLineCon++;
}

void ShakerFree(CShaker * I)
{
  VLAFreeP(I->PlanCon);
  VLAFreeP(I->PyraCon);
  VLAFreeP(I->DistCon);
  VLAFreeP(I->LineCon);
  VLAFreeP(I->TorsCon);
  OOFreeP(I);
}

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