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tornavis/source/blender/editors/transform/transform_mode_vert_slide.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup edtransform
*/
#include <cstdlib>
#include "MEM_guardedalloc.h"
#include "BLI_math_matrix.h"
#include "BLI_string.h"
#include "BKE_context.hh"
#include "BKE_editmesh.hh"
#include "BKE_unit.h"
#include "GPU_immediate.h"
#include "GPU_matrix.h"
#include "GPU_state.h"
#include "ED_screen.hh"
#include "WM_api.hh"
#include "WM_types.hh"
#include "RNA_access.hh"
#include "UI_interface.hh"
#include "UI_resources.hh"
#include "BLT_translation.h"
#include "transform.hh"
#include "transform_constraints.hh"
#include "transform_convert.hh"
#include "transform_mode.hh"
#include "transform_snap.hh"
using namespace blender;
/* -------------------------------------------------------------------- */
/** \name Transform (Vert Slide)
* \{ */
struct TransDataVertSlideVert {
/** #TransDataGenericSlideVert (header) */
BMVert *v;
LinkNode **cd_loop_groups;
float co_orig_3d[3];
/* end generic */
float (*co_link_orig_3d)[3];
int co_link_tot;
int co_link_curr;
};
struct VertSlideData {
TransDataVertSlideVert *sv;
int totsv;
int curr_sv_index;
/* result of ED_view3d_ob_project_mat_get */
float proj_mat[4][4];
};
struct VertSlideParams {
float perc;
bool use_even;
bool flipped;
};
static void vert_slide_update_input(TransInfo *t)
{
VertSlideParams *slp = static_cast<VertSlideParams *>(t->custom.mode.data);
VertSlideData *sld = static_cast<VertSlideData *>(
TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data);
TransDataVertSlideVert *sv = &sld->sv[sld->curr_sv_index];
const float *co_orig_3d = sv->co_orig_3d;
const float *co_curr_3d = sv->co_link_orig_3d[sv->co_link_curr];
float co_curr_2d[2], co_orig_2d[2];
int mval_ofs[2], mval_start[2], mval_end[2];
ED_view3d_project_float_v2_m4(t->region, co_orig_3d, co_orig_2d, sld->proj_mat);
ED_view3d_project_float_v2_m4(t->region, co_curr_3d, co_curr_2d, sld->proj_mat);
ARRAY_SET_ITEMS(mval_ofs, t->mouse.imval[0] - co_orig_2d[0], t->mouse.imval[1] - co_orig_2d[1]);
ARRAY_SET_ITEMS(mval_start, co_orig_2d[0] + mval_ofs[0], co_orig_2d[1] + mval_ofs[1]);
ARRAY_SET_ITEMS(mval_end, co_curr_2d[0] + mval_ofs[0], co_curr_2d[1] + mval_ofs[1]);
if (slp->flipped && slp->use_even) {
setCustomPoints(t, &t->mouse, mval_start, mval_end);
}
else {
setCustomPoints(t, &t->mouse, mval_end, mval_start);
}
}
static void calcVertSlideCustomPoints(TransInfo *t)
{
vert_slide_update_input(t);
/* setCustomPoints isn't normally changing as the mouse moves,
* in this case apply mouse input immediately so we don't refresh
* with the value from the previous points */
applyMouseInput(t, &t->mouse, t->mval, t->values);
}
/**
* Run once when initializing vert slide to find the reference edge
*/
static void calcVertSlideMouseActiveVert(TransInfo *t, const float2 &mval_fl)
{
/* Active object may have no selected vertices. */
VertSlideData *sld = static_cast<VertSlideData *>(
TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data);
TransDataVertSlideVert *sv;
/* set the vertex to use as a reference for the mouse direction 'curr_sv_index' */
float dist_sq = 0.0f;
float dist_min_sq = FLT_MAX;
int i;
for (i = 0, sv = sld->sv; i < sld->totsv; i++, sv++) {
float co_2d[2];
ED_view3d_project_float_v2_m4(t->region, sv->co_orig_3d, co_2d, sld->proj_mat);
dist_sq = len_squared_v2v2(mval_fl, co_2d);
if (dist_sq < dist_min_sq) {
dist_min_sq = dist_sq;
sld->curr_sv_index = i;
}
}
}
/**
* Run while moving the mouse to slide along the edge matching the mouse direction
*/
static void calcVertSlideMouseActiveEdges(TransInfo *t, const float2 &mval_fl)
{
VertSlideData *sld = static_cast<VertSlideData *>(
TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data);
float dir[3];
TransDataVertSlideVert *sv;
int i;
/* NOTE: we could save a matrix-multiply for each vertex
* by finding the closest edge in local-space.
* However this skews the outcome with non-uniform-scale. */
/* First get the direction of the original mouse position. */
sub_v2_v2v2(dir, t->mouse.imval, mval_fl);
ED_view3d_win_to_delta(t->region, dir, t->zfac, dir);
normalize_v3(dir);
for (i = 0, sv = sld->sv; i < sld->totsv; i++, sv++) {
if (sv->co_link_tot > 1) {
float dir_dot_best = -FLT_MAX;
int co_link_curr_best = -1;
int j;
for (j = 0; j < sv->co_link_tot; j++) {
float tdir[3];
float dir_dot;
sub_v3_v3v3(tdir, sv->co_orig_3d, sv->co_link_orig_3d[j]);
mul_mat3_m4_v3(TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->object_to_world, tdir);
project_plane_v3_v3v3(tdir, tdir, t->viewinv[2]);
normalize_v3(tdir);
dir_dot = dot_v3v3(dir, tdir);
if (dir_dot > dir_dot_best) {
dir_dot_best = dir_dot;
co_link_curr_best = j;
}
}
if (co_link_curr_best != -1) {
sv->co_link_curr = co_link_curr_best;
}
}
}
}
static VertSlideData *createVertSlideVerts(TransInfo *t, const TransDataContainer *tc)
{
BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
BMesh *bm = em->bm;
BMIter iter;
BMIter eiter;
BMEdge *e;
BMVert *v;
TransDataVertSlideVert *sv_array;
VertSlideData *sld = static_cast<VertSlideData *>(MEM_callocN(sizeof(*sld), "sld"));
int j;
sld->curr_sv_index = 0;
j = 0;
BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
bool ok = false;
if (BM_elem_flag_test(v, BM_ELEM_SELECT) && v->e) {
BM_ITER_ELEM (e, &eiter, v, BM_EDGES_OF_VERT) {
if (!BM_elem_flag_test(e, BM_ELEM_HIDDEN)) {
ok = true;
break;
}
}
}
if (ok) {
BM_elem_flag_enable(v, BM_ELEM_TAG);
j += 1;
}
else {
BM_elem_flag_disable(v, BM_ELEM_TAG);
}
}
if (!j) {
MEM_freeN(sld);
return nullptr;
}
sv_array = static_cast<TransDataVertSlideVert *>(
MEM_callocN(sizeof(TransDataVertSlideVert) * j, "sv_array"));
j = 0;
BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
if (BM_elem_flag_test(v, BM_ELEM_TAG)) {
int k;
sv_array[j].v = v;
copy_v3_v3(sv_array[j].co_orig_3d, v->co);
k = 0;
BM_ITER_ELEM (e, &eiter, v, BM_EDGES_OF_VERT) {
if (!BM_elem_flag_test(e, BM_ELEM_HIDDEN)) {
k++;
}
}
sv_array[j].co_link_orig_3d = static_cast<float(*)[3]>(
MEM_mallocN(sizeof(*sv_array[j].co_link_orig_3d) * k, __func__));
sv_array[j].co_link_tot = k;
k = 0;
BM_ITER_ELEM (e, &eiter, v, BM_EDGES_OF_VERT) {
if (!BM_elem_flag_test(e, BM_ELEM_HIDDEN)) {
BMVert *v_other = BM_edge_other_vert(e, v);
copy_v3_v3(sv_array[j].co_link_orig_3d[k], v_other->co);
k++;
}
}
j++;
}
}
sld->sv = sv_array;
sld->totsv = j;
/* most likely will be set below */
unit_m4(sld->proj_mat);
if (t->spacetype == SPACE_VIEW3D) {
/* view vars */
RegionView3D *rv3d = nullptr;
ARegion *region = t->region;
rv3d = static_cast<RegionView3D *>(region ? region->regiondata : nullptr);
if (rv3d) {
ED_view3d_ob_project_mat_get(rv3d, tc->obedit, sld->proj_mat);
}
}
return sld;
}
static void freeVertSlideVerts(TransInfo * /*t*/,
TransDataContainer * /*tc*/,
TransCustomData *custom_data)
{
VertSlideData *sld = static_cast<VertSlideData *>(custom_data->data);
if (!sld) {
return;
}
if (sld->totsv > 0) {
TransDataVertSlideVert *sv = sld->sv;
int i = 0;
for (i = 0; i < sld->totsv; i++, sv++) {
MEM_freeN(sv->co_link_orig_3d);
}
}
MEM_freeN(sld->sv);
MEM_freeN(sld);
custom_data->data = nullptr;
}
static eRedrawFlag handleEventVertSlide(TransInfo *t, const wmEvent *event)
{
VertSlideParams *slp = static_cast<VertSlideParams *>(t->custom.mode.data);
if (slp) {
switch (event->type) {
case EVT_EKEY:
if (event->val == KM_PRESS) {
slp->use_even = !slp->use_even;
if (slp->flipped) {
calcVertSlideCustomPoints(t);
}
return TREDRAW_HARD;
}
break;
case EVT_FKEY:
if (event->val == KM_PRESS) {
slp->flipped = !slp->flipped;
calcVertSlideCustomPoints(t);
return TREDRAW_HARD;
}
break;
case EVT_CKEY:
/* use like a modifier key */
if (event->val == KM_PRESS) {
t->flag ^= T_ALT_TRANSFORM;
calcVertSlideCustomPoints(t);
return TREDRAW_HARD;
}
break;
case MOUSEMOVE: {
/* don't recalculate the best edge */
const bool is_clamp = !(t->flag & T_ALT_TRANSFORM);
if (is_clamp) {
calcVertSlideMouseActiveEdges(t, float2(event->mval));
}
calcVertSlideCustomPoints(t);
break;
}
default:
break;
}
}
return TREDRAW_NOTHING;
}
static void drawVertSlide(TransInfo *t)
{
if (TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data) {
const VertSlideParams *slp = static_cast<const VertSlideParams *>(t->custom.mode.data);
VertSlideData *sld = static_cast<VertSlideData *>(
TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data);
const bool is_clamp = !(t->flag & T_ALT_TRANSFORM);
/* Non-Prop mode */
{
TransDataVertSlideVert *curr_sv = &sld->sv[sld->curr_sv_index];
TransDataVertSlideVert *sv;
const float ctrl_size = UI_GetThemeValuef(TH_FACEDOT_SIZE) + 1.5f;
const float line_size = UI_GetThemeValuef(TH_OUTLINE_WIDTH) + 0.5f;
const int alpha_shade = -160;
int i;
GPU_depth_test(GPU_DEPTH_NONE);
GPU_blend(GPU_BLEND_ALPHA);
GPU_matrix_push();
GPU_matrix_mul(TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->object_to_world);
GPU_line_width(line_size);
const uint shdr_pos = GPU_vertformat_attr_add(
immVertexFormat(), "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
immUniformThemeColorShadeAlpha(TH_EDGE_SELECT, 80, alpha_shade);
immBegin(GPU_PRIM_LINES, sld->totsv * 2);
if (is_clamp) {
sv = sld->sv;
for (i = 0; i < sld->totsv; i++, sv++) {
immVertex3fv(shdr_pos, sv->co_orig_3d);
immVertex3fv(shdr_pos, sv->co_link_orig_3d[sv->co_link_curr]);
}
}
else {
sv = sld->sv;
for (i = 0; i < sld->totsv; i++, sv++) {
float a[3], b[3];
sub_v3_v3v3(a, sv->co_link_orig_3d[sv->co_link_curr], sv->co_orig_3d);
mul_v3_fl(a, 100.0f);
negate_v3_v3(b, a);
add_v3_v3(a, sv->co_orig_3d);
add_v3_v3(b, sv->co_orig_3d);
immVertex3fv(shdr_pos, a);
immVertex3fv(shdr_pos, b);
}
}
immEnd();
GPU_point_size(ctrl_size);
immBegin(GPU_PRIM_POINTS, 1);
immVertex3fv(shdr_pos,
(slp->flipped && slp->use_even) ?
curr_sv->co_link_orig_3d[curr_sv->co_link_curr] :
curr_sv->co_orig_3d);
immEnd();
immUnbindProgram();
/* direction from active vertex! */
if (!compare_v2v2(t->mval, t->mouse.imval, FLT_EPSILON)) {
float zfac;
float co_orig_3d[3];
float co_dest_3d[3];
float2 xy_delta = t->mval - t->mouse.imval;
mul_v3_m4v3(co_orig_3d,
TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->object_to_world,
curr_sv->co_orig_3d);
zfac = ED_view3d_calc_zfac(static_cast<const RegionView3D *>(t->region->regiondata),
co_orig_3d);
ED_view3d_win_to_delta(t->region, xy_delta, zfac, co_dest_3d);
invert_m4_m4(TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->world_to_object,
TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->object_to_world);
mul_mat3_m4_v3(TRANS_DATA_CONTAINER_FIRST_OK(t)->obedit->world_to_object, co_dest_3d);
add_v3_v3(co_dest_3d, curr_sv->co_orig_3d);
GPU_line_width(1.0f);
immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
float viewport_size[4];
GPU_viewport_size_get_f(viewport_size);
immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);
immUniform1i("colors_len", 0); /* "simple" mode */
immUniformColor4f(1.0f, 1.0f, 1.0f, 1.0f);
immUniform1f("dash_width", 6.0f);
immUniform1f("udash_factor", 0.5f);
immBegin(GPU_PRIM_LINES, 2);
immVertex3fv(shdr_pos, curr_sv->co_orig_3d);
immVertex3fv(shdr_pos, co_dest_3d);
immEnd();
immUnbindProgram();
}
GPU_matrix_pop();
GPU_depth_test(GPU_DEPTH_LESS_EQUAL);
}
}
}
static void vert_slide_apply_elem(const TransDataVertSlideVert *sv,
const float perc,
const bool use_even,
const bool use_flip,
float r_co[3])
{
if (use_even == false) {
interp_v3_v3v3(r_co, sv->co_orig_3d, sv->co_link_orig_3d[sv->co_link_curr], perc);
}
else {
float dir[3];
sub_v3_v3v3(dir, sv->co_link_orig_3d[sv->co_link_curr], sv->co_orig_3d);
float edge_len = normalize_v3(dir);
if (edge_len > FLT_EPSILON) {
if (use_flip) {
madd_v3_v3v3fl(r_co, sv->co_link_orig_3d[sv->co_link_curr], dir, -perc);
}
else {
madd_v3_v3v3fl(r_co, sv->co_orig_3d, dir, perc);
}
}
else {
copy_v3_v3(r_co, sv->co_orig_3d);
}
}
}
static void doVertSlide(TransInfo *t, float perc)
{
VertSlideParams *slp = static_cast<VertSlideParams *>(t->custom.mode.data);
slp->perc = perc;
const bool use_even = slp->use_even;
FOREACH_TRANS_DATA_CONTAINER (t, tc) {
VertSlideData *sld = static_cast<VertSlideData *>(tc->custom.mode.data);
if (sld == nullptr) {
continue;
}
float tperc = perc;
if (use_even) {
TransDataVertSlideVert *sv_curr = &sld->sv[sld->curr_sv_index];
const float edge_len_curr = len_v3v3(sv_curr->co_orig_3d,
sv_curr->co_link_orig_3d[sv_curr->co_link_curr]);
tperc *= edge_len_curr;
}
TransDataVertSlideVert *sv = sld->sv;
for (int i = 0; i < sld->totsv; i++, sv++) {
vert_slide_apply_elem(sv, tperc, use_even, slp->flipped, sv->v->co);
}
}
}
static void vert_slide_snap_apply(TransInfo *t, float *value)
{
TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_OK(t);
VertSlideData *sld = static_cast<VertSlideData *>(tc->custom.mode.data);
TransDataVertSlideVert *sv = &sld->sv[sld->curr_sv_index];
float snap_point[3], co_orig_3d[3], co_curr_3d[3], dvec[3];
copy_v3_v3(co_orig_3d, sv->co_orig_3d);
copy_v3_v3(co_curr_3d, sv->co_link_orig_3d[sv->co_link_curr]);
if (tc->use_local_mat) {
mul_m4_v3(tc->mat, co_orig_3d);
mul_m4_v3(tc->mat, co_curr_3d);
}
getSnapPoint(t, dvec);
sub_v3_v3(dvec, t->tsnap.snap_source);
if (t->tsnap.target_type & (SCE_SNAP_TO_EDGE | SCE_SNAP_TO_FACE)) {
float co_dir[3];
sub_v3_v3v3(co_dir, co_curr_3d, co_orig_3d);
normalize_v3(co_dir);
if (t->tsnap.target_type & SCE_SNAP_TO_EDGE) {
transform_constraint_snap_axis_to_edge(t, co_dir, dvec);
}
else {
transform_constraint_snap_axis_to_face(t, co_dir, dvec);
}
}
add_v3_v3v3(snap_point, co_orig_3d, dvec);
*value = line_point_factor_v3(snap_point, co_orig_3d, co_curr_3d);
}
static void applyVertSlide(TransInfo *t)
{
char str[UI_MAX_DRAW_STR];
size_t ofs = 0;
float final;
VertSlideParams *slp = static_cast<VertSlideParams *>(t->custom.mode.data);
const bool flipped = slp->flipped;
const bool use_even = slp->use_even;
const bool is_clamp = !(t->flag & T_ALT_TRANSFORM);
const bool is_constrained = !(is_clamp == false || hasNumInput(&t->num));
final = t->values[0] + t->values_modal_offset[0];
transform_snap_mixed_apply(t, &final);
if (!validSnap(t)) {
transform_snap_increment(t, &final);
}
/* only do this so out of range values are not displayed */
if (is_constrained) {
CLAMP(final, 0.0f, 1.0f);
}
applyNumInput(&t->num, &final);
t->values_final[0] = final;
/* header string */
ofs += BLI_strncpy_rlen(str + ofs, TIP_("Vertex Slide: "), sizeof(str) - ofs);
if (hasNumInput(&t->num)) {
char c[NUM_STR_REP_LEN];
outputNumInput(&(t->num), c, &t->scene->unit);
ofs += BLI_strncpy_rlen(str + ofs, &c[0], sizeof(str) - ofs);
}
else {
ofs += BLI_snprintf_rlen(str + ofs, sizeof(str) - ofs, "%.4f ", final);
}
ofs += BLI_snprintf_rlen(
str + ofs, sizeof(str) - ofs, TIP_("(E)ven: %s, "), WM_bool_as_string(use_even));
if (use_even) {
ofs += BLI_snprintf_rlen(
str + ofs, sizeof(str) - ofs, TIP_("(F)lipped: %s, "), WM_bool_as_string(flipped));
}
ofs += BLI_snprintf_rlen(
str + ofs, sizeof(str) - ofs, TIP_("Alt or (C)lamp: %s"), WM_bool_as_string(is_clamp));
/* done with header string */
/* do stuff here */
doVertSlide(t, final);
recalc_data(t);
ED_area_status_text(t->area, str);
}
static void vert_slide_transform_matrix_fn(TransInfo *t, float mat_xform[4][4])
{
float delta[3], orig_co[3], final_co[3];
VertSlideParams *slp = static_cast<VertSlideParams *>(t->custom.mode.data);
TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_OK(t);
VertSlideData *sld_active = static_cast<VertSlideData *>(tc->custom.mode.data);
TransDataVertSlideVert *sv_active = &sld_active->sv[sld_active->curr_sv_index];
copy_v3_v3(orig_co, sv_active->co_orig_3d);
float tperc = t->values_final[0];
if (slp->use_even) {
const float edge_len_curr = len_v3v3(sv_active->co_orig_3d,
sv_active->co_link_orig_3d[sv_active->co_link_curr]);
tperc *= edge_len_curr;
}
vert_slide_apply_elem(sv_active, tperc, slp->use_even, slp->flipped, final_co);
if (tc->use_local_mat) {
mul_m4_v3(tc->mat, orig_co);
mul_m4_v3(tc->mat, final_co);
}
sub_v3_v3v3(delta, final_co, orig_co);
add_v3_v3(mat_xform[3], delta);
}
static void initVertSlide_ex(TransInfo *t, bool use_even, bool flipped, bool use_clamp)
{
t->mode = TFM_VERT_SLIDE;
{
VertSlideParams *slp = static_cast<VertSlideParams *>(MEM_callocN(sizeof(*slp), __func__));
slp->use_even = use_even;
slp->flipped = flipped;
slp->perc = 0.0f;
if (!use_clamp) {
t->flag |= T_ALT_TRANSFORM;
}
t->custom.mode.data = slp;
t->custom.mode.use_free = true;
}
bool ok = false;
FOREACH_TRANS_DATA_CONTAINER (t, tc) {
VertSlideData *sld = createVertSlideVerts(t, tc);
if (sld) {
tc->custom.mode.data = sld;
tc->custom.mode.free_cb = freeVertSlideVerts;
ok = true;
}
}
if (ok == false) {
t->state = TRANS_CANCEL;
return;
}
calcVertSlideMouseActiveVert(t, t->mval);
calcVertSlideMouseActiveEdges(t, t->mval);
/* set custom point first if you want value to be initialized by init */
calcVertSlideCustomPoints(t);
initMouseInputMode(t, &t->mouse, INPUT_CUSTOM_RATIO);
t->idx_max = 0;
t->num.idx_max = 0;
t->snap[0] = 0.1f;
t->snap[1] = t->snap[0] * 0.1f;
copy_v3_fl(t->num.val_inc, t->snap[0]);
t->num.unit_sys = t->scene->unit.system;
t->num.unit_type[0] = B_UNIT_NONE;
}
static void initVertSlide(TransInfo *t, wmOperator *op)
{
bool use_even = false;
bool flipped = false;
bool use_clamp = true;
if (op) {
use_even = RNA_boolean_get(op->ptr, "use_even");
flipped = RNA_boolean_get(op->ptr, "flipped");
use_clamp = RNA_boolean_get(op->ptr, "use_clamp");
}
initVertSlide_ex(t, use_even, flipped, use_clamp);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Mouse Input Utilities
* \{ */
void transform_mode_vert_slide_reproject_input(TransInfo *t)
{
if (t->spacetype == SPACE_VIEW3D) {
RegionView3D *rv3d = static_cast<RegionView3D *>(t->region->regiondata);
FOREACH_TRANS_DATA_CONTAINER (t, tc) {
VertSlideData *sld = static_cast<VertSlideData *>(tc->custom.mode.data);
ED_view3d_ob_project_mat_get(rv3d, tc->obedit, sld->proj_mat);
}
}
vert_slide_update_input(t);
}
/** \} */
TransModeInfo TransMode_vertslide = {
/*flags*/ T_NO_CONSTRAINT,
/*init_fn*/ initVertSlide,
/*transform_fn*/ applyVertSlide,
/*transform_matrix_fn*/ vert_slide_transform_matrix_fn,
/*handle_event_fn*/ handleEventVertSlide,
/*snap_distance_fn*/ transform_snap_distance_len_squared_fn,
/*snap_apply_fn*/ vert_slide_snap_apply,
/*draw_fn*/ drawVertSlide,
};
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