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get_next_ray.c
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get_next_ray.c
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/* this file has three functions:
get_ray_setup() :- loads the TRANSPORT matrices,
reset_get_ray() :- resets the counter variables for another pass
get_next_ray() :- sets the ray to the next ray to follow.
*/
#include "raytr.h"
static float R[6][6],T[6][6][6],in[6],outvec[6],Zo,z;
static float delta_plo,delta_phi,delta_y,delta_angle;
static float dp,dy,dangle;
static int set_up= FALSE,cray_num=0;
/* added by dbd january 16 2008 */
/* static float cer_angle = 0.01157; */
/* cerenkov angle for neon at 1 atm, n= 1.000067 */
/* gh - 2008
Cherenkov angle for 7.0 GeV/c pions, 2.84deg
delta_plo,delta_phi for asymmetric SHMS delta acceptance
*/
static float cer_angle = 0.049567;
int using_x_direction;
/*--------------------------------------------------*/
/*--------------------------------------------------*/
extern int ray_number,num_caught;
using namespace std;
void get_ray_setup() {
int i,j,k,dum;
float numsamples;
char fname[50];
FILE *file;
do {
printf("Transport file name: ");
scanf("%s",fname);
file = fopen(fname,"r");
if( ! file )
printf("Unable to open file '%s'.\n",fname);
}
while( ! file );
Zo = 24.56;
fscanf(file," %f\n",&Zo);
/* read first order matrix */
for(j=0;j<6;j++)
{
for(i=0;i<6;i++)
{
fscanf(file,"%f ",&(R[j][i]));
}
fscanf(file,"\n");
}
/* read second order matrix */
for(i=0;i<6;i++)
for(j=0;j<6;j++)
for(k=0;k<6;k++)
T[i][j][k] = 0.0;
for(i=0;i<5;i++)
{
for(j=0;j<6;j++)
{
for(k=0;k<=j;k++)
fscanf(file,"%d %d %e",&dum,&dum,&(T[i][j][k]) );
fscanf(file,"\n");
}
fscanf(file,"\n");
}
fclose( file );
/* input user stuff */
for(i=0;i<6;in[i++]=0.0);
in[_X] = 0.01;
printf("z=0 equals how meters along the beam path: ");
scanf("%f",&z);
printf("Do you want to vary the\n");
printf(" (1) dispersive\n");
printf(" (2) transverse\n");
scanf("%d",&i);
if( i == 1 )
using_x_direction = TRUE;
else if ( i== 2)
using_x_direction = FALSE;
else {
printf("Not a choice\n");
exit(1);
}
if( using_x_direction ) {
printf("Enter delta theta and number of sample points: ");
scanf("%f,%f",&delta_angle,&numsamples);
dangle = 2.0*delta_angle/(numsamples-1.0);
in[_THETA] = -delta_angle;
printf("Enter delta plo, delta phi, and number of sample points : ");
scanf("%f,%f,%f",&delta_plo,&delta_phi,&numsamples);
/* dp = 2.0*delta_p/(numsamples-1.0); */
dp = (delta_phi-delta_plo)/(numsamples-1.0);
in[_DELTA] = delta_plo;
// fprintf(out,"title 'Dispersive: DQ: %5.1f; D: %5.1f%5.1f",delta_angle,delta_plo,delta_phi);
// fprintf(out,"; z=0 is at %6.2f m.'\n",z);
// fprintf(out,"case ' FG G'\n");
} else {
printf("Enter delta phi and number of sample points: ");
scanf("%f,%f",&delta_angle,&numsamples);
dangle = 2.0*delta_angle/(numsamples-1.0);
in[_PHI] = -delta_angle;
printf("Enter delta y and number of sample points : ");
scanf("%f,%f",&delta_y,&numsamples);
dy = 2.0*delta_y/(numsamples-1.0);
in[_Y] = -delta_y;
// fprintf(out,"title 'Tranverse: DF: %5.1f; Dy: %5.1f",delta_angle,delta_y);
// fprintf(out,"; z=0 is at %6.2f m.'\n",z);
// fprintf(out,"case ' FG F'\n");
}
set_up= TRUE;
ray_number = 0;
}
// reset_get_ray(out)
// FILE *out;
/*--------------------------------------------------*/
/*--------------------------------------------------*/
void reset_get_ray() {
if( using_x_direction )
{
in[_THETA] = -delta_angle;
/* in[_DELTA] = -delta_p; */
in[_DELTA] = -delta_plo;
// fprintf(out,"title 'Dispersive: DQ: %5.1f; D: %5.1f%5.1f",delta_angle,delta_plo,delta_phi);
// fprintf(out,"; z=0 is at %6.2f m.'\n",z);
// fprintf(out,"case ' FG G'\n");
}
else
{
in[_PHI] = -delta_angle;
in[_Y] = -delta_y;
// fprintf(out,"title 'Tranverse: DF: %5.1f; Dy: %5.1f",delta_angle,delta_y);
// fprintf(out,"; z=0 is at %6.2f m.'\n",z);
// fprintf(out,"case ' FG F'\n");
}
ray_number = 0;
}
/*--------------------------------------------------*/
/*--------------------------------------------------*/
int get_next_ray(RAY* r, float left, float right) {
// RAY *r;
RAY templ;
int i,j,k;
float theta;
// if( ! set_up )
// get_ray_setup();
// if( cray_num == 0 ) {
//
// if( using_x_direction ) {
//
//
// /*--------------------------------------------------*/
// /// Exit with the last ray
//
//
// if( in[_THETA] > delta_angle )
// return( 0 ); /* done last ray */
// /* do matrix multiplies */
// for(i=0;i<6;i++)
// {
// outvec[i] = 0;
// for(j=0;j<6;j++)
// {
// outvec[i] += R[i][j]*in[j];
// for(k=0;k<6;k++)
// outvec[i] += T[i][j][k]*in[j]*in[k];
// }
// }
// /* convert to RAY structure */
// templ.x = left;
// templ.y = outvec[_X];
// templ.theta = 0.5*PI - outvec[_THETA]/1000.0;
// theta = outvec[_THETA]/1000.0;
// /* increment to next ray */
// /* if( (in[_DELTA] += dp) > delta_p ) */
// if( (in[_DELTA] += dp) > delta_phi ) {
// /* in[_DELTA] = -delta_p; */
// in[_DELTA] = delta_plo;
// in[_THETA] += dangle;
// }
//
// } else {
//
// // /* tranverse case, like above dispersive case ( using_x_direction = TRUE ) */
// //
// // if( in[_PHI] > delta_angle )
// // return( 0 );
// // for(i=0;i<6;i++)
// // {
// // outvec[i] = 0;
// // for(j=0;j<6;j++)
// // {
// // outvec[i] += R[i][j]*in[j];
// // for(k=0;k<6;k++)
// // outvec[i] += T[i][j][k]*in[j]*in[k];
// // }
// // }
// // templ.x = left;
// // templ.y = outvec[_Y];
// // templ.theta = 0.5*PI + outvec[_PHI]/1000.0;
// //
// // if( (in[_Y] += dy) > delta_y ) {
// //
// // in[_Y] = -delta_y;
// // in[_PHI] += dangle;
// //
// // }
//
// }
//
// templ.y += tan(templ.theta-0.5*PI)*(Zo-z)*100.0;
//
// // fprintf(out,"%f %f\n%f %f\njoin\n",left,template.y,right,
// // template.y-tan(template.theta-0.5*PI)*(right-left) );
//
//
//
// TGraph* traj_in = new TGraph();
//
// traj_in->SetPoint(traj_in->GetN(), left,templ.y);
// traj_in->SetPoint(traj_in->GetN(), right, templ.y-tan(templ.theta-0.5*PI)*(right-left));
//
// traj_in->SetLineStyle(2);
//
// // traj_in->SetLineWidth(2);
// traj_in->Draw("C");
//
// delete traj_in;
//
// }
//
// r->x = templ.x;
// r->y = templ.y;
// r->theta = templ.theta + cer_angle*(float)(cray_num-1);
//
//
//
// r->x = 0.0;
// r->y = 20.8;
// r->theta = 1.5;
//
//
// cout << r->x << " " << r->y << " " << r->theta << endl;
// exit(0);
// cout << "??? " << ray_number << " " << r->x << " " << r->y << " " << r->theta << endl;
// r->x = 22.0;
// r->y = 37.0;
// r->theta = -40* asin(1.0)/90 ;
//
// r->x = 13.0;
// r->y = 46.0;
// r->theta = -60* asin(1.0)/90 ;
//
// r->x = 25.0;
// r->y = 40.0;
// r->theta = -42.13* asin(1.0)/90 ;
//
if (ray_number == 0) {
r->theta = -42.13* asin(1.0)/90 ;
// r->x = 22.0;
// r->y = 38.0;
// r->x = 22.0;
// r->y = 38.0;
// r->x = reference_x + 23 * sin(abs(r->theta));
// r->y = reference_y - 23 * cos(abs(r->theta));
r->x = reference_x + (5) * sin(abs(r->theta));
r->y = reference_y - (5) * cos(abs(r->theta));
// r->theta = -60* asin(1.0)/90;
// r->x = 19.9876;
// r->y = 40.2249;
cout << "Setup the ray " << endl;
// exit(0);
// r->x = 22.0 + (-15) * sin(abs(r->theta));
// r->y = 38.0 - (-15) * cos(abs(r->theta));
r->theta = -60* asin(1.0)/90 ;
//
//
// r->x = reference_x + 22 * sin(abs(r->theta));
// r->y = reference_y - 22 * cos(abs(r->theta));
// r->x = reference_x + 27 * sin(abs(r->theta));
// r->y = reference_y - 27 * cos(abs(r->theta));
} else {
r->theta = -42.13* asin(1.0)/90 ;
//
// // r->x = 22.0 + ray_number * 0.5 * sin(abs(r->theta));
// // r->y = 38.0 - ray_number * 0.5 * cos(abs(r->theta));
//
//
// if (ray_number%2 == 1) {
//
// r->x = 22.0 - ray_number * 1 * sin(abs(r->theta));
// r->y = 38.0 + ray_number * 1 * cos(abs(r->theta));
//
// cout << "Ray number: " << ray_number << " " << r->x << " " << r->y << " modulus: " << ray_number%2 << " " << ray_number * 1 * sin(abs(r->theta)) << " " << ray_number * 1 * cos(abs(r->theta)) << endl;
//
// } else {
//
// r->x = 22.0 + ray_number * 1 * sin(abs(r->theta));
// r->y = 38.0 - ray_number * 1 * cos(abs(r->theta));
//
// cout << "Ray number: " << ray_number << " " << r->x << " " << r->y << " modulus: " << ray_number%2 << " " << ray_number * 1 * sin(abs(r->theta)) << " " << ray_number * 1 * cos(abs(r->theta)) << endl;
//
// }
if (ray_number == 1) {
r->x = reference_x + 12 * sin(abs(r->theta));
r->y = reference_y - 12 * cos(abs(r->theta));
} else if(ray_number == 2) {
r->x = reference_x + 17 * sin(abs(r->theta));
r->y = reference_y - 17 * cos(abs(r->theta));
} else if(ray_number == 3) {
r->x = reference_x + 22 * sin(abs(r->theta));
r->y = reference_y - 22 * cos(abs(r->theta));
} else if(ray_number == 4) {
r->x = reference_x + 27 * sin(abs(r->theta));
r->y = reference_y - 27 * cos(abs(r->theta));
}
}
if (ray_number == 5) {
return 0;
}
ray_number++;
cray_num = (cray_num+1)%3;
return(1);
}
/*--------------------------------------------------*/
/*--------------------------------------------------*/