transform_snap_object_armature.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_math_matrix.hh"
 
#include "BKE_armature.hh"
#include "BKE_bvhutils.hh"
#include "DNA_armature_types.h"
 
#include "ED_transform_snap_object_context.hh"
 
#include "ANIM_bone_collections.hh"
 
#include "transform_snap_object.hh"
 
using blender::float4x4;
 
eSnapMode snapArmature(SnapObjectContext *sctx,
                       const Object *ob_eval,
                       const float4x4 &obmat,
                       bool is_object_active)
{
  eSnapMode retval = SCE_SNAP_TO_NONE;
 
  if (sctx->runtime.snap_to_flag == SCE_SNAP_TO_FACE) {
    /* Currently only edge and vert. */
    return retval;
  }
 
  bArmature *arm = static_cast<bArmature *>(ob_eval->data);
 
  SnapData nearest2d(sctx, obmat);
 
  const bool is_editmode = arm->edbo != nullptr;
 
  if (is_editmode == false) {
    const std::optional<blender::Bounds<blender::float3>> bounds = BKE_armature_min_max(ob_eval);
    if (bounds && !nearest2d.snap_boundbox(bounds->min, bounds->max)) {
      return retval;
    }
  }
 
  nearest2d.clip_planes_enable(sctx, ob_eval);
 
  const float *head_vec = nullptr, *tail_vec = nullptr;
 
  const bool is_posemode = is_object_active && (ob_eval->mode & OB_MODE_POSE);
  const bool skip_selected = (is_editmode || is_posemode) &&
                             (sctx->runtime.params.snap_target_select &
                              SCE_SNAP_TARGET_NOT_SELECTED);
 
  if (arm->edbo) {
    LISTBASE_FOREACH (EditBone *, eBone, arm->edbo) {
      if (ANIM_bonecoll_is_visible_editbone(arm, eBone)) {
        if (eBone->flag & BONE_HIDDEN_A) {
          /* Skip hidden bones. */
          continue;
        }
 
        const bool is_selected = (eBone->flag & (BONE_ROOTSEL | BONE_TIPSEL)) != 0;
        if (is_selected && skip_selected) {
          continue;
        }
 
        if (nearest2d.snap_edge(eBone->head, eBone->tail)) {
          head_vec = eBone->head;
          tail_vec = eBone->tail;
        }
      }
    }
  }
  else if (ob_eval->pose && ob_eval->pose->chanbase.first) {
    LISTBASE_FOREACH (bPoseChannel *, pchan, &ob_eval->pose->chanbase) {
      Bone *bone = pchan->bone;
      if (!bone || (bone->flag & (BONE_HIDDEN_P | BONE_HIDDEN_PG))) {
        /* Skip hidden bones. */
        continue;
      }
 
      const bool is_selected = (bone->flag & (BONE_SELECTED | BONE_ROOTSEL | BONE_TIPSEL)) != 0;
      if (is_selected && skip_selected) {
        continue;
      }
 
      if (nearest2d.snap_edge(pchan->pose_head, pchan->pose_tail)) {
        head_vec = pchan->pose_head;
        tail_vec = pchan->pose_tail;
      }
    }
  }
 
  if (nearest2d.nearest_point.index != -2) {
    retval = sctx->runtime.snap_to_flag & SCE_SNAP_TO_EDGE;
    if (retval == SCE_SNAP_TO_NONE) {
      nearest2d.nearest_point.index = -2;
    }
 
    if (sctx->runtime.snap_to_flag & SCE_SNAP_TO_EDGE_ENDPOINT) {
      float dist_px_sq_edge = nearest2d.nearest_point.dist_sq;
      nearest2d.nearest_point.dist_sq = sctx->ret.dist_px_sq;
      if (nearest2d.snap_point(head_vec) || nearest2d.snap_point(tail_vec)) {
        retval = SCE_SNAP_TO_EDGE_ENDPOINT;
      }
      else if (retval) {
        nearest2d.nearest_point.dist_sq = dist_px_sq_edge;
      }
    }
  }
 
  if (retval) {
    nearest2d.register_result(sctx, ob_eval, &arm->id);
  }
  return retval;
}