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/*------------------------------------------------------------------------
* Graphic library
* Copyright (C) 1998-2000 Enpc/Jean-Philippe Chancelier
* jpc@cereve.enpc.fr
--------------------------------------------------------------------------*/
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "Math.h"
#include "PloEch.h"
static double MiniD __PARAMS((double *x,integer n));
/*-----------------------------------------------------------------
* int C2F(champ)(x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr)
* int C2F(champ1)(x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr)
*
* Used for Drawing 2 dimensional vector fields
* (fx[i+(*n1)*j], fy[i+(*n1)*j]) is the value of the vector field
* at point X=(x[i],y[j]);
*
* - fx and fy are (*n1)*(*n2) matrix of double
* - arfact : a factor by which to multiply the default arrow size
* usr 1.0 by defaut
* - strflag : a string of length 3 (see plot2d)
* - brect=[xmin,ymin,xmax,ymax] (see plot2d)
*
* - lstr : (used when called from Fortran code)
-------------------------------------------------------------------*/
void champg(name, colored, x, y, fx, fy, n1, n2, strflag, brect, arfact, lstr)
char *name;
integer colored;
double x[],y[],fx[],fy[];
integer *n1,*n2;
char *strflag;
double *brect;
double *arfact;
integer lstr;
{
static integer aaint[]={2,10,2,10};
integer *xm,*ym,*zm,i,j,n,na;
double xx[2],yy[2], maxx;
double nx,ny,sc,sfx,sfy,sfx2,sfy2;
double arsize1=0.5,arsize2=0.5;
integer arsize,nn1=1,nn2=2,iflag=0;
/* get default dash fo rarrows **/
integer verbose=0,narg,xz[10],uc;
C2F(dr)("xget","use color",&verbose, &uc, &narg,PI0,PI0,PI0,PD0,PD0,PD0,PD0,0L,0L);
if (uc)
C2F(dr)("xget","color",&verbose,xz,&narg,PI0,PI0,PI0,PD0,PD0,PD0,PD0,0L,0L);
else
C2F(dr)("xget","line style",&verbose,xz,&narg,PI0,PI0,PI0,PD0,PD0,PD0,PD0,0L,0L);
/** The arrowsize acording to the windowsize **/
n=2*(*n1)*(*n2);
xx[0]=x[0];xx[1]=x[*n1-1];
yy[0]=y[0];yy[1]=y[*n2-1];
/** Boundaries of the frame **/
update_frame_bounds(0,"gnn",xx,yy,&nn1,&nn2,aaint,strflag,brect);
/* Storing values if using the Record driver */
if (GetDriver()=='R')
StoreChamp(name,x,y,fx,fy,n1,n2,strflag,brect,arfact);
/** Allocation **/
xm = graphic_alloc(0,n,sizeof(int));
ym = graphic_alloc(1,n,sizeof(int));
if ( xm == 0 || ym == 0)
{
sciprint("Running out of memory \n");
return ;
}
if ( colored != 0) {
zm = graphic_alloc(2,n/2,sizeof(int));
if ( zm == 0 )
{
sciprint("Running out of memory \n");
return ;
}
}
/* From double to pixels */
for ( i = 0 ; i < *n1 ; i++)
for ( j =0 ; j < *n2 ; j++)
{
xm[2*(i +(*n1)*j)]= XScale(x[i]);
ym[2*(i +(*n1)*j)]= YScale(y[j]);
}
/** Scaling **/
nx=MiniD(x,*n1)*Cscale.Wscx1;
ny=MiniD(y,*n2)*Cscale.Wscy1;
sfx= Cscale.Wscx1;
sfy= Cscale.Wscy1;
sfx2= sfx*sfx;
sfy2= sfy*sfy;
maxx = sfx2*fx[0]*fx[0]+sfy2*fy[0]*fy[0];
for (i = 1; i < (*n1)*(*n2) ; i++)
{
double maxx1 = sfx2*fx[i]*fx[i]+sfy2*fy[i]*fy[i];
if ( maxx1 > maxx) maxx=maxx1;
}
maxx = ( maxx < SMDOUBLE) ? SMDOUBLE : sqrt(maxx);
sc=maxx;
/*sc= Min(nx,ny)/sc;*/
sc= sqrt(nx*nx+ny*ny)/sc;
sfx *= sc;
sfy *= sc;
/** size of arrow **/
arsize1= ((double) Cscale.WIRect1[2])/(5*(*n1));
arsize2= ((double) Cscale.WIRect1[3])/(5*(*n2));
arsize= (arsize1 < arsize2) ? inint(arsize1*10.0) : inint(arsize2*10.0) ;
arsize = (int)(arsize*(*arfact));
set_clip_box(Cscale.WIRect1[0],Cscale.WIRect1[0]+Cscale.WIRect1[2],Cscale.WIRect1[1],
Cscale.WIRect1[1]+Cscale.WIRect1[3]);
if ( colored == 0 )
{
int j=0;
for ( i = 0 ; i < (*n1)*(*n2) ; i++)
{
integer x1n,y1n,x2n,y2n,flag1=0;
xm[1+2*j]= (int)(sfx*fx[i]/2+xm[2*i]);
xm[2*j] = (int)(-sfx*fx[i]/2+xm[2*i]);
ym[1+2*j]= (int)(-sfy*fy[i]/2+ym[2*i]);
ym[2*j] = (int)(sfy*fy[i]/2+ym[2*i]);
clip_line(xm[2*j],ym[2*j],xm[2*j+1],ym[2*j+1],&x1n,&y1n,&x2n,&y2n,&flag1);
if (flag1 !=0)
{
if (flag1==1||flag1==3) { xm[2*j]=x1n;ym[2*j]=y1n;};
if (flag1==2||flag1==3) { xm[2*j+1]=x2n;ym[2*j+1]=y2n;};
/* sciprint("j'ai rajoute (%d,%d)->(%d,%d)\r\n",xm[2*j],ym[2*j],xm[2*j+1],ym[2*j+1]); */
j++;
}
}
na=2*j;
}
else
{
integer x1n,y1n,x2n,y2n,flag1=0;
integer whiteid;
int j=0;
C2F(dr)("xget","lastpattern",&verbose,&whiteid,&narg,PI0,PI0,PI0,PD0,PD0,PD0,PD0,0L,0L);
for ( i = 0 ; i < (*n1)*(*n2) ; i++)
{
double nor= sqrt(sfx2*fx[i]*fx[i]+sfy2*fy[i]*fy[i]);
zm[j] = inint( ((double) whiteid)*(1.0 - nor/maxx));
nor= sqrt(fx[i]*fx[i]+fy[i]*fy[i]);
xm[1+2*j]= (int)(sfx*fx[i]/(2*nor)+xm[2*i]);
xm[2*j] = (int)(-sfx*fx[i]/(2*nor)+xm[2*i]);
ym[1+2*j]= (int)(-sfy*fy[i]/(2*nor)+ym[2*i]);
ym[2*j] = (int)(sfy*fy[i]/(2*nor)+ym[2*i]);
clip_line(xm[2*j],ym[2*j],xm[2*j+1],ym[2*j+1],&x1n,&y1n,&x2n,&y2n,&flag1);
if (flag1 !=0)
{
if (flag1==1||flag1==3) { xm[2*j]=x1n;ym[2*j]=y1n;};
if (flag1==2||flag1==3) { xm[2*j+1]=x2n;ym[2*j+1]=y2n;};
j++;
}
}
na=2*j;
}
/** Drawing axes **/
axis_draw(strflag);
/** Drawing the curves **/
frame_clip_on();
if ( colored ==0)
C2F(dr)("xarrow","v",xm,ym,&na,&arsize,xz,&iflag,PD0,PD0,PD0,PD0,0L,0L);
else
C2F(dr)("xarrow","v",xm,ym,&na,&arsize,zm,(iflag=1,&iflag),PD0,PD0,PD0,PD0,0L,0L);
frame_clip_off();
}
int C2F(champ)(x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr)
double x[],y[],fx[],fy[],brect[],*arfact;
integer *n1,*n2;
char strflag[];
integer lstr;
{
champg("champ",0,x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr);
return(0);
}
int C2F(champ1)(x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr)
double x[],y[],fx[],fy[],brect[],*arfact;
integer *n1,*n2;
char strflag[];
integer lstr;
{
champg("champ1",1,x,y,fx,fy,n1,n2,strflag,brect,arfact,lstr);
return(0);
}
/*----------------------------------
* Returns min( abs(x)) excluding null x(i) values
* if x==0 then 1 is returned
*----------------------------------*/
static double MiniD(x, n)
double *x;
integer n;
{
int i;
double dx=1,mindx=1;
if ( n < 2 ) return(mindx);
mindx= Abs(x[1]-x[0]);
mindx = ( mindx != 0 ) ? mindx : 1;
for ( i = 2 ; i < n ; i++)
{
dx = Abs(x[i]-x[i-1]);
if ( dx < mindx && dx != 0 ) mindx=dx;
}
return(mindx);
}
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