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-
- Listing 2
-
- poly(nverts, poly_list)
- int nverts, *poly_list[];
- {
- int i;
-
- /*
- see if vertices list is closed
- and close it if not
- */
- if (poly_list[0] != poly_list[(nverts*2)-2] ||
- poly_list[1] != poly_list[(nverts*2)-1])
- {
- poly_list[(nverts*2)+0] = poly_list[0];
- poly_list[(nverts*2)+1] = poly_list[1];
- nverts++;
- }
-
- /*
- invert the Y axis of each vertice in list
- */
- for (i=0; i < nverts; i++)
- poly_list[(i * 2)+1] = ydots-poly_list[(i * 2)+1];
-
- /*
- then draw it
- */
- if (filling)
- fill_polygon_a(nverts,poly_list);
- else
- draw_polyline(nverts,poly_list);
- }
-