1 #include "mplot.h"
frame(double xs,double ys,double xf,double yf)2 void frame(double xs, double ys, double xf, double yf){
3 	register double	osidex, osidey;
4 	osidex = e1->sidex;
5 	osidey = e1->sidey;
6 	e1->left = e0->left + xs * e0->sidex;
7 	e1->bottom = e0->bottom + ys * e0->sidey;
8 	e1->sidex = (xf-xs)*e0->sidex;
9 	e1->sidey = (yf-ys)*e0->sidey;
10 	e1->scalex *= (e1->sidex / osidex);
11 	e1->scaley *= (e1->sidey / osidey);
12 	e1->quantum=e0->quantum/sqrt(e1->scalex*e1->scalex +
13 		e1->scaley*e1->scaley);
14 	if(e1->quantum < .01)
15 		e1->quantum = .01;
16 }
17