#include<stdlib.h>
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#include "general.h"
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#include "energy.h"
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#include "vertex.h"
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#include<math.h>
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#include<stdio.h>
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ts_bool mean_curvature_and_energy(ts_vesicle *vesicle){
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ts_uint i;
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ts_vertex_list *vlist=vesicle->vlist;
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ts_vertex **vtx=vlist->vtx;
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for(i=0;i<vlist->n;i++){
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energy_vertex(vtx[i]);
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}
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return TS_SUCCESS;
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}
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inline ts_bool energy_vertex(ts_vertex *vtx){
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// ts_vertex *vtx=&vlist->vertex[n]-1; // Caution! 0 Indexed value!
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// ts_triangle *tristar=vtx->tristar-1;
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//ts_vertex_data *data=vtx->data;
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ts_uint jj;
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ts_uint jjp,jjm;
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ts_vertex *j,*jp, *jm;
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ts_triangle *jt;
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ts_double s=0.0,xh=0.0,yh=0.0,zh=0.0,txn=0.0,tyn=0.0,tzn=0.0;
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ts_double x1,x2,x3,ctp,ctm,tot,xlen;
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ts_double h,ht;
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for(jj=1; jj<=vtx->neigh_no;jj++){
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jjp=jj+1;
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if(jjp>vtx->neigh_no) jjp=1;
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jjm=jj-1;
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if(jjm<1) jjm=vtx->neigh_no;
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j=vtx->neigh[jj-1];
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jp=vtx->neigh[jjp-1];
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jm=vtx->neigh[jjm-1];
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// printf("tristar_no=%u, neigh_no=%u, jj=%u\n",data->tristar_no,data->neigh_no,jj);
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jt=vtx->tristar[jj-1];
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x1=vtx_distance_sq(vtx,jp); //shouldn't be zero!
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x2=vtx_distance_sq(j,jp); // shouldn't be zero!
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x3=(j->x-jp->x)*(vtx->x-jp->x)+
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(j->y-jp->y)*(vtx->y-jp->y)+
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(j->z-jp->z)*(vtx->z-jp->z);
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#ifdef TS_DOUBLE_DOUBLE
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ctp=x3/sqrt(x1*x2-x3*x3);
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#endif
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#ifdef TS_DOUBLE_FLOAT
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ctp=x3/sqrtf(x1*x2-x3*x3);
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#endif
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#ifdef TS_DOUBLE_LONGDOUBLE
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ctp=x3/sqrtl(x1*x2-x3*x3);
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#endif
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x1=vtx_distance_sq(vtx,jm);
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x2=vtx_distance_sq(j,jm);
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x3=(j->x-jm->x)*(vtx->x-jm->x)+
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(j->y-jm->y)*(vtx->y-jm->y)+
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(j->z-jm->z)*(vtx->z-jm->z);
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#ifdef TS_DOUBLE_DOUBLE
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ctm=x3/sqrt(x1*x2-x3*x3);
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#endif
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#ifdef TS_DOUBLE_FLOAT
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ctm=x3/sqrtf(x1*x2-x3*x3);
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#endif
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#ifdef TS_DOUBLE_LONGDOUBLE
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ctm=x3/sqrtl(x1*x2-x3*x3);
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#endif
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tot=ctp+ctm;
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tot=0.5*tot;
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xlen=vtx_distance_sq(j,vtx);
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/*
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#ifdef TS_DOUBLE_DOUBLE
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vtx->bond[jj-1]->bond_length=sqrt(xlen);
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#endif
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#ifdef TS_DOUBLE_FLOAT
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vtx->bond[jj-1]->bond_length=sqrtf(xlen);
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#endif
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#ifdef TS_DOUBLE_LONGDOUBLE
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vtx->bond[jj-1]->bond_length=sqrtl(xlen);
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#endif
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vtx->bond[jj-1]->bond_length_dual=tot*vtx->bond[jj-1]->bond_length;
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*/
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s+=tot*xlen;
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xh+=tot*(j->x - vtx->x);
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yh+=tot*(j->y - vtx->y);
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zh+=tot*(j->z - vtx->z);
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txn+=jt->xnorm;
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tyn+=jt->ynorm;
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tzn+=jt->znorm;
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}
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h=xh*xh+yh*yh+zh*zh;
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ht=txn*xh+tyn*yh + tzn*zh;
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s=s/4.0;
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#ifdef TS_DOUBLE_DOUBLE
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if(ht>=0.0) {
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vtx->curvature=sqrt(h);
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} else {
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vtx->curvature=-sqrt(h);
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}
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#endif
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#ifdef TS_DOUBLE_FLOAT
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if(ht>=0.0) {
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vtx->curvature=sqrtf(h);
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} else {
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vtx->curvature=-sqrtf(h);
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}
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#endif
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#ifdef TS_DOUBLE_LONGDOUBLE
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if(ht>=0.0) {
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vtx->curvature=sqrtl(h);
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} else {
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vtx->curvature=-sqrtl(h);
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}
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#endif
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// What is vtx->c?????????????? Here it is 0!
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// c is forced curvature energy for each vertex. Should be set to zero for
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// normal circumstances.
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vtx->energy=0.5*s*(vtx->curvature/s-vtx->c)*(vtx->curvature/s-vtx->c);
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return TS_SUCCESS;
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}
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