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