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Sourcecode: acm4 version File versions  Download package

VDrawPoly.c

#include "Vlib.h"

void VDrawPolygon(v, win, gc, poly)
Viewport *v;
Window       win;
GC     gc;
VPolygon *poly; {

      VPoint      *p;
      XPoint      xpt[VmaxVP];
      int   i;
      Drawable d;

      d = (v->flags & VPPixmap) ? (Drawable) v->monoPixmap : (Drawable) win;

      if (poly == (VPolygon *) NULL)
            return;

      for ((i=0, p=poly->vertex); i<poly->numVtces; (++i, ++p)) {
          if (v->flags & VPPerspective) {
            xpt[i].x = (v->Middl.x + (int) (v->Scale.x * p->x / p->z)) >> 2;
            xpt[i].y = (v->Middl.y - (int) (v->Scale.y * p->y / p->z)) >> 2;
          }
          else {
            xpt[i].x = (v->Middl.x + (int) (v->Scale.x * p->x)) >> 2;
            xpt[i].y = (v->Middl.y - (int) (v->Scale.y * p->y)) >> 2;
          }
      }

      if (i > 0) {
            xpt[i] = xpt[0];
            XDrawLines (v->dpy, d, gc, xpt, i+1, CoordModeOrigin);
      }

}

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