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#include <stdio.h>
#include "tek.h"
frame(xs, ys, xf, yf)
double xs, ys, xf, yf;
{
	register double	osidex, osidey;
	osidex = e1->sidex;
	osidey = e1->sidey;
	e1->left = xs * (e0->left + e0->sidex);
	e1->bottom = ys* (e0->bottom +  e0->sidey);
	e1->sidex = (xf-xs) * e0->sidex;
	e1->sidey = (yf-ys) * e0->sidey;
	e1->scalex *= (e1->sidex / osidex);
	e1->scaley *= (e1->sidey / osidey);
	e1->quantum=e0->quantum/sqrt(e1->scalex*e1->scalex +
		e1->scaley*e1->scaley);
	if(e1->quantum < .01)
		e1->quantum = .01;
}

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