C++ (Cpp) clip_polygon Examples

Example #1

File: draw.c Project: jihnsius/d2r

//deal with face that must be clipped
bool must_clip_flat_face(int nv,g3s_codes cc)
{
	int i;
        bool ret=0;
	g3s_point **bufptr;

	bufptr = clip_polygon(Vbuf0,Vbuf1,&nv,&cc);

	if (nv>0 && !(cc.uor&CC_BEHIND) && !cc.uand) {

		for (i=0;i<nv;i++) {
			g3s_point *p = bufptr[i];
	
			if (!(p->p3_flags&PF_PROJECTED))
				g3_project_point(p);
	
			if (p->p3_flags&PF_OVERFLOW) {
				ret = 1;
				goto free_points;
			}

			Vertex_list[i*2]   = p->p3_sx;
			Vertex_list[i*2+1] = p->p3_sy;
		}
	
		(*flat_drawer_ptr)(nv,(int *)Vertex_list);
	}
	else 
		ret=1;

	//free temp points
free_points:
	;

	for (i=0;i<nv;i++)
		if (Vbuf1[i]->p3_flags & PF_TEMP_POINT)
			free_temp_point(Vbuf1[i]);

//	Assert(free_point_num==0);

	return ret;
}

Example #2

File: draw.c Project: paud/d2x-xl

//------------------------------------------------------------------------------
//deal with face that must be clipped
bool MustClipFlatFace (int nv, g3sCodes cc)
{
	int i;
        bool ret=0;
	g3sPoint **bufptr;

	bufptr = clip_polygon (Vbuf0, Vbuf1, &nv, &cc);

	if (nv>0 && ! (cc.or&CC_BEHIND) && !cc.and) {

		for (i=0;i<nv;i++) {
			g3sPoint *p = bufptr[i];

			if (! (p->p3_flags & PF_PROJECTED))
				G3ProjectPoint (p);

			if (p->p3_flags & PF_OVERFLOW) {
				ret = 1;
				goto free_points;
			}

			polyVertList[i*2]   = p->p3_screen.x;
			polyVertList[i*2+1] = p->p3_screen.y;
		}

		 (*flat_drawer_ptr) (nv, (int *)polyVertList);
	}
	else 
		ret=1;

	//D2_FREE temp points
free_points:
	;

	for (i=0;i<nv;i++)
		if (Vbuf1[i]->p3_flags & PF_TEMP_POINT)
			free_temp_point (Vbuf1[i]);

//	Assert (free_point_num==0);

	return ret;
}

Example #3

File: itembin.c Project: Jalakas/navit

void
item_bin_write_clipped(struct item_bin *ib, struct tile_parameter *param, struct item_bin_sink *out)
{
	struct tile_data tile_data;
	int i;
	bbox((struct coord *)(ib+1), ib->clen/2, &tile_data.item_bbox);
	tile_data.buffer[0]='\0';
	tile_data.tile_depth=tile(&tile_data.item_bbox, NULL, tile_data.buffer, param->max, param->overlap, &tile_data.tile_bbox);
	if (tile_data.tile_depth == param->max || tile_data.tile_depth >= param->min) {
		item_bin_write_to_sink(ib, out, &tile_data);
		return;
	}
	for (i = 0 ; i < 4 ; i++) {
		struct rect clip_rect;
		tile_data.buffer[tile_data.tile_depth]='a'+i;
		tile_data.buffer[tile_data.tile_depth+1]='\0';
		tile_bbox(tile_data.buffer, &clip_rect, param->overlap);
		if (ib->type < type_area)
			clip_line(ib, &clip_rect, param, out);
		else
			clip_polygon(ib, &clip_rect, param, out);
	}
}

Example #4

File: draw.c Project: jihnsius/d2r

bool must_clip_tmap_face(int nv,g3s_codes cc,grs_bitmap *bm)
{
	g3s_point **bufptr;
	int i;

	bufptr = clip_polygon(Vbuf0,Vbuf1,&nv,&cc);

	if (nv && !(cc.uor&CC_BEHIND) && !cc.uand) {

		for (i=0;i<nv;i++) {
			g3s_point *p = bufptr[i];

			if (!(p->p3_flags&PF_PROJECTED))
				g3_project_point(p);
	
			if (p->p3_flags&PF_OVERFLOW) {
				Int3();		//should not overflow after clip
				goto free_points;
			}
		}

		(*tmap_drawer_ptr)(bm,nv,bufptr);
	}

free_points:
	;

	for (i=0;i<nv;i++)
		if (bufptr[i]->p3_flags & PF_TEMP_POINT)
			free_temp_point(bufptr[i]);

//	Assert(free_point_num==0);
	
	return 0;

}