56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
#include <string>
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#include <iostream>
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#include <iomanip>
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#include "nr.h"
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using namespace std;
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void NR::scrsho(DP fx(const DP))
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{
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const int ISCR=60, JSCR=21;
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const char BLANK=' ', ZERO='-', YY='l', XX='-', FF='x';
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int jz,j,i;
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DP ysml,ybig,x2,x1,x,dyj,dx;
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Vec_DP y(ISCR);
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string scr[JSCR];
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for (;;) {
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cout << endl << "Enter x1 x2 (x1=x2 to stop):" << endl;
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cin >> x1 >> x2;
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if (x1 == x2) break;
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scr[0]=YY;
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for (i=1;i<(ISCR-1);i++)
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scr[0] += XX;
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scr[0] += YY;
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for (j=1;j<(JSCR-1);j++) {
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scr[j]=YY;
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for (i=1;i<(ISCR-1);i++)
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scr[j] += BLANK;
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scr[j] += YY;
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}
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scr[JSCR-1]=scr[0];
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dx=(x2-x1)/(ISCR-1);
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x=x1;
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ysml=ybig=0.0;
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for (i=0;i<ISCR;i++) {
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y[i]=fx(x);
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if (y[i] < ysml) ysml=y[i];
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if (y[i] > ybig) ybig=y[i];
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x += dx;
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}
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if (ybig == ysml) ybig=ysml+1.0;
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dyj=(JSCR-1)/(ybig-ysml);
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jz=int(-ysml*dyj);
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for (i=0;i<ISCR;i++) {
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scr[jz][i]=ZERO;
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j=int((y[i]-ysml)*dyj);
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scr[j][i]=FF;
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}
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cout << fixed << setprecision(3);
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cout << setw(11) << ybig << " " << scr[JSCR-1] << endl;
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for (j=JSCR-2;j>=1;j--)
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cout << " " << scr[j] << endl;
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cout << setw(11) << ysml << " " << scr[0] << endl;
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cout << setw(19) << x1 << setw(55) << x2;
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}
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}
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