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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor(s): Francisco De La Cruz
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/bmesh/operators/bmo_slide.c
* \ingroup bmesh
*/
#include "MEM_guardedalloc.h"
#include "BKE_global.h"
#include "BLI_math.h"
#include "bmesh.h"
#include "intern/bmesh_operators_private.h" /* own include */
#define EDGE_MARK 1
#define VERT_MARK 2
/*
* Slides a vertex along a connected edge
*
*/
void bmo_vertex_slide_exec(BMesh *bm, BMOperator *op)
{
BMOIter oiter;
BMIter iter;
BMHeader *h;
BMVert *vertex;
BMEdge *edge;
BMEdge *slide_edge;
/* Selection counts */
int selected_edges = 0;
/* Get slide amount */
const float distance_t = BMO_slot_float_get(op, "distance_t");
/* Get start vertex */
vertex = BMO_iter_new(&oiter, bm, op, "vert", BM_VERT);
if (!vertex) {
if (G.debug & G_DEBUG) {
fprintf(stderr, "vertex_slide: No vertex selected...");
}
BMO_error_raise(bm, op, BMERR_INVALID_SELECTION, "Vertex Slide Error: Invalid selection.");
return;
}
/* Count selected edges */
BMO_ITER (h, &oiter, bm, op, "edge", BM_VERT | BM_EDGE) {
switch (h->htype) {
case BM_EDGE:
selected_edges++;
/* Mark all selected edges (cast BMHeader->BMEdge) */
BMO_elem_flag_enable(bm, (BMElemF *)h, EDGE_MARK);
break;
}
}
/* Only allow sliding if an edge is selected */
if (selected_edges == 0) {
if (G.debug & G_DEBUG) {
fprintf(stderr, "vertex_slide: select a single edge\n");
}
BMO_error_raise(bm, op, BMERR_INVALID_SELECTION, "Vertex Slide Error: Invalid selection.");
return;
}
/* Make sure we get the correct edge. */
slide_edge = NULL;
BM_ITER_ELEM (edge, &iter, vertex, BM_EDGES_OF_VERT) {
if (BMO_elem_flag_test(bm, edge, EDGE_MARK) && BM_vert_in_edge(edge, vertex)) {
slide_edge = edge;
break;
}
}
/* Found edge */
if (slide_edge) {
BMVert *other = BM_edge_other_vert(slide_edge, vertex);
/* mark */
BMO_elem_flag_enable(bm, vertex, VERT_MARK);
/* Interpolate */
interp_v3_v3v3(vertex->co, vertex->co, other->co, distance_t);
}
/* Return the new edge. The same previously marked with VERT_MARK */
BMO_slot_buffer_from_enabled_flag(bm, op, "vertout", BM_VERT, VERT_MARK);
return;
}
#undef EDGE_MARK
#undef VERT_MARK
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