tframe.c - plan9port - [fork] Plan 9 from user space
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       tframe.c (496B)
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            1 #include "mplot.h"
            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 }