static void
fill_clipped_contour (hidGC gc, PLINE *pl, const BoxType *clip_box)
{
PLINE *pl_copy;
POLYAREA *clip_poly;
POLYAREA *piece_poly;
POLYAREA *clipped_pieces;
POLYAREA *draw_piece;
int x;
clip_poly = RectPoly (clip_box->X1, clip_box->X2,
clip_box->Y1, clip_box->Y2);
poly_CopyContour (&pl_copy, pl);
piece_poly = poly_Create ();
poly_InclContour (piece_poly, pl_copy);
x = poly_Boolean_free (piece_poly, clip_poly,
&clipped_pieces, PBO_ISECT);
if (x != err_ok || clipped_pieces == NULL)
return;
draw_piece = clipped_pieces;
do
{
/* NB: The polygon won't have any holes in it */
fill_contour (gc, draw_piece->contours);
}
while ((draw_piece = draw_piece->f) != clipped_pieces);
poly_Free (&clipped_pieces);
}
/* ---------------------------------------------------------------------------
* frees memory used by a polygon
*/
void
FreePolygonMemory (PolygonTypePtr Polygon)
{
if (Polygon)
{
MYFREE (Polygon->Points);
MYFREE (Polygon->HoleIndex);
if (Polygon->Clipped)
poly_Free (&Polygon->Clipped);
poly_FreeContours (&Polygon->NoHoles);
memset (Polygon, 0, sizeof (PolygonType));
}
}
/* ---------------------------------------------------------------------------
* frees memory used by a polygon
*/
void
FreePolygonMemory (PolygonType *polygon)
{
if (polygon == NULL)
return;
free (polygon->Points);
free (polygon->HoleIndex);
if (polygon->Clipped)
poly_Free (&polygon->Clipped);
poly_FreeContours (&polygon->NoHoles);
memset (polygon, 0, sizeof (PolygonType));
}
