tsbox.c - plan9port - [fork] Plan 9 from user space
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       tsbox.c (442B)
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            1 #include "mplot.h"
            2 int clipminx, clipminy, clipmaxx, clipmaxy;
            3 void sbox(double xx0, double yy0, double xx1, double yy1){
            4         int x0=SCX(xx0), y0=SCY(yy0), x1=SCX(xx1), y1=SCY(yy1);
            5         int t;
            6         if(x1<x0){ t=x0; x0=x1; x1=t; }
            7         if(y1<y0){ t=y0; y0=y1; y1=t; }
            8         if(x0<clipminx) x0=clipminx;
            9         if(y0<clipminy) y0=clipminy;
           10         if(x1>clipmaxx) x1=clipmaxx;
           11         if(y1>clipmaxy) y1=clipmaxy;
           12         if(x1<x0 || y1<y0) return;
           13         m_clrwin(x0, y0, x1, y1, e1->backgr);
           14 }