2 #define code(x, y) ((x<clipminx?1:x>clipmaxx?2:0)|(y<clipminy?4:y>clipmaxy?8:0))
3 void vec(double xx, double yy){
4 int x0, y0, x1, y1, c0, c1, c, tx, ty;
6 t=SCX(e1->copyx); if(fabs(t)>BIGINT) return; x0=t;
7 t=SCY(e1->copyy); if(fabs(t)>BIGINT) return; y0=t;
8 t=SCX(xx); if(fabs(t)>BIGINT) return; x1=t;
9 t=SCY(yy); if(fabs(t)>BIGINT) return; y1=t;
12 /* clipping -- what a concept */
18 if(c&1) ty=y0+(y1-y0)*(clipminx-x0)/(x1-x0), tx=clipminx;
19 else if(c&2) ty=y0+(y1-y0)*(clipmaxx-x0)/(x1-x0), tx=clipmaxx;
20 else if(c&4) tx=x0+(x1-x0)*(clipminy-y0)/(y1-y0), ty=clipminy;
21 else tx=x0+(x1-x0)*(clipmaxy-y0)/(y1-y0), ty=clipmaxy;
22 if(c==c0) x0=tx, y0=ty, c0=code(x0, y0);
23 else x1=tx, y1=ty, c1=code(x1, y1);
25 m_vector(x0, y0, x1, y1, e1->foregr);