Added stretching energy plugin

Samo Penic

2019-03-09 4df6ed05246cf8bc9fe0cb0c8766ebc368d2f512

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#include <stdlib.h>
#include<math.h>
 
#include "general.h"
#include "vertex.h"
#include "cell.h"
#include "vesicle.h"
#include "frame.h"
char plugin_name[] = "Constant area";
char plugin_description[]= "Plugin that enables constant area of the vesicle.";
char plugin_author[] = "SAMO PENIC";
 
 
typedef struct {
    ts_double darea;
    ts_double A0;
    ts_double epsarea;
} plugin_data;
 
 
ts_plugin_details *init (){
    ts_plugin_details *details=(ts_plugin_details *)calloc(1,sizeof(ts_plugin_details));
    details->name = plugin_name;
    details->data = (plugin_data *)calloc(1,sizeof(plugin_data)); //storing data
    return details;    
}
 
 
ts_vesicle *after_vesicle_init(ts_vesicle *vesicle){
    plugin_data *data=(plugin_data *)vesicle->plist->pointer->plugin->details->data;
    ts_fprintf(stdout,"area volume initialized\n");
    centermass(vesicle);
    cell_occupation(vesicle);
    vesicle_area(vesicle);
    data->A0=vesicle->area;
    data->epsarea=data->A0/(ts_double)vesicle->tlist->n;
    return vesicle;
}
 
 
void vm_energy_before_prepare(ts_vesicle *vesicle, ts_vertex *vtx){    
    if(vesicle->tape->constareaswitch>0){
        plugin_data *data=(plugin_data *)vesicle->plist->pointer->plugin->details->data;
        data->darea=0;
        ts_uint i;
        for(i=0;i<vtx->tristar_no;i++) data->darea-=vtx->tristar[i]->area;
    
    }
}
 
ts_double vm_before_montecarlo_constraint(ts_vesicle *vesicle, ts_vertex *vtx, ts_vertex *old_vtx){
    if(vesicle->tape->constareaswitch>0){
        plugin_data *data=(plugin_data *)vesicle->plist->pointer->plugin->details->data;
        ts_uint i;
        for(i=0;i<vtx->tristar_no;i++) data->darea+=vtx->tristar[i]->area;
            if(fabs(vesicle->area+data->darea-data->A0)>data->epsarea) return TS_FAIL;
    }
    return TS_SUCCESS;
}
 
 
void vm_new_state_accepted(ts_vesicle *vesicle, ts_vertex *vtx, ts_vertex *old_vtx){
    if(vesicle->tape->constareaswitch >0){
        plugin_data *data=(plugin_data *)vesicle->plist->pointer->plugin->details->data;
        vesicle->area+=data->darea;
    }
}