Merge branch 'master' into blender2.8
authorCampbell Barton <ideasman42@gmail.com>
Thu, 6 Sep 2018 04:42:59 +0000 (14:42 +1000)
committerCampbell Barton <ideasman42@gmail.com>
Thu, 6 Sep 2018 04:43:47 +0000 (14:43 +1000)
1  2 
source/blender/editors/space_view3d/view3d_gizmo_ruler.c
source/blender/editors/space_view3d/view3d_ruler.c

index 1fe9a2b1632a8b6d6f35915cc79beb946acddc70,0000000000000000000000000000000000000000..d7a605eca5e3d4ffc262e756bc8dd9355945f1e7
mode 100644,000000..100644
--- /dev/null
@@@ -1,1093 -1,0 +1,1093 @@@
-                       const float px_scale = (ED_view3d_pixel_size(rv3d, ruler_item->co[1]) *
 +/*
 + * ***** 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.
 + *
 + * ***** END GPL LICENSE BLOCK *****
 + */
 +
 +/** \file blender/editors/space_view3d/view3d_gizmo_ruler.c
 + *  \ingroup spview3d
 + */
 +
 +#include "BLI_listbase.h"
 +#include "BLI_string.h"
 +#include "BLI_rect.h"
 +#include "BLI_math.h"
 +#include "BLI_utildefines.h"
 +
 +#include "BLT_translation.h"
 +
 +#include "BKE_context.h"
 +#include "BKE_gpencil.h"
 +#include "BKE_main.h"
 +
 +#include "BKE_object.h"
 +#include "BKE_unit.h"
 +#include "BKE_material.h"
 +
 +#include "DNA_meshdata_types.h"
 +#include "DNA_object_types.h"
 +#include "DNA_gpencil_types.h"
 +#include "DNA_view3d_types.h"
 +
 +#include "BIF_gl.h"
 +
 +#include "ED_gpencil.h"
 +#include "ED_screen.h"
 +#include "ED_transform_snap_object_context.h"
 +#include "ED_view3d.h"
 +
 +#include "UI_resources.h"
 +#include "UI_interface.h"
 +
 +#include "MEM_guardedalloc.h"
 +
 +#include "RNA_access.h"
 +
 +#include "WM_api.h"
 +#include "WM_types.h"
 +#include "WM_toolsystem.h"
 +
 +#include "view3d_intern.h"  /* own include */
 +
 +#include "GPU_immediate.h"
 +#include "GPU_immediate_util.h"
 +#include "GPU_select.h"
 +#include "GPU_state.h"
 +
 +#include "BLF_api.h"
 +
 +
 +static const char *view3d_gzgt_ruler_id = "VIEW3D_GGT_ruler";
 +
 +
 +#define MVAL_MAX_PX_DIST 12.0f
 +
 +/* -------------------------------------------------------------------- */
 +/* Ruler Item (we can have many) */
 +enum {
 +      RULERITEM_USE_ANGLE = (1 << 0),  /* use protractor */
 +      RULERITEM_USE_RAYCAST = (1 << 1)
 +};
 +
 +enum {
 +      RULERITEM_DIRECTION_IN = 0,
 +      RULERITEM_DIRECTION_OUT
 +};
 +
 +/* keep smaller then selection, since we may want click elsewhere without selecting a ruler */
 +#define RULER_PICK_DIST 12.0f
 +#define RULER_PICK_DIST_SQ (RULER_PICK_DIST * RULER_PICK_DIST)
 +
 +/* not clicking on a point */
 +#define PART_LINE 0xff
 +
 +/* -------------------------------------------------------------------- */
 +/* Ruler Info (wmGizmoGroup customdata) */
 +
 +enum {
 +      RULER_STATE_NORMAL = 0,
 +      RULER_STATE_DRAG
 +};
 +
 +enum {
 +      RULER_SNAP_OK = (1 << 0),
 +};
 +
 +typedef struct RulerInfo {
 +      // ListBase items;
 +      int      item_active;
 +      int flag;
 +      int snap_flag;
 +      int state;
 +
 +      struct SnapObjectContext *snap_context;
 +
 +      /* wm state */
 +      wmWindow *win;
 +      ScrArea *sa;
 +      ARegion *ar;  /* re-assigned every modal update */
 +} RulerInfo;
 +
 +/* -------------------------------------------------------------------- */
 +/* Ruler Item (two or three points) */
 +
 +typedef struct RulerItem {
 +      wmGizmo gz;
 +
 +      /* worldspace coords, middle being optional */
 +      float co[3][3];
 +
 +      int   flag;
 +      int   raycast_dir;  /* RULER_DIRECTION_* */
 +} RulerItem;
 +
 +typedef struct RulerInteraction {
 +      /* selected coord */
 +      char  co_index; /* 0 -> 2 */
 +      float drag_start_co[3];
 +      uint inside_region : 1;
 +} RulerInteraction;
 +
 +/* -------------------------------------------------------------------- */
 +/** \name Internal Ruler Utilities
 + * \{ */
 +
 +static RulerItem *ruler_item_add(wmGizmoGroup *gzgroup)
 +{
 +      /* could pass this as an arg */
 +      const wmGizmoType *gzt_ruler = WM_gizmotype_find("VIEW3D_GT_ruler_item", true);
 +      RulerItem *ruler_item = (RulerItem *)WM_gizmo_new_ptr(gzt_ruler, gzgroup, NULL);
 +      WM_gizmo_set_flag(&ruler_item->gz, WM_GIZMO_DRAW_MODAL, true);
 +      return ruler_item;
 +}
 +
 +static void ruler_item_remove(bContext *C, wmGizmoGroup *gzgroup, RulerItem *ruler_item)
 +{
 +      WM_gizmo_unlink(&gzgroup->gizmos, gzgroup->parent_gzmap, &ruler_item->gz, C);
 +}
 +
 +static void ruler_item_as_string(RulerItem *ruler_item, UnitSettings *unit,
 +                                 char *numstr, size_t numstr_size, int prec)
 +{
 +      const bool do_split = (unit->flag & USER_UNIT_OPT_SPLIT) != 0;
 +
 +      if (ruler_item->flag & RULERITEM_USE_ANGLE) {
 +              const float ruler_angle = angle_v3v3v3(ruler_item->co[0],
 +                                                     ruler_item->co[1],
 +                                                     ruler_item->co[2]);
 +
 +              if (unit->system == USER_UNIT_NONE) {
 +                      BLI_snprintf(numstr, numstr_size, "%.*f°", prec, RAD2DEGF(ruler_angle));
 +              }
 +              else {
 +                      bUnit_AsString(numstr, numstr_size,
 +                                     (double)ruler_angle,
 +                                     prec, unit->system, B_UNIT_ROTATION, do_split, false);
 +              }
 +      }
 +      else {
 +              const float ruler_len = len_v3v3(ruler_item->co[0],
 +                                               ruler_item->co[2]);
 +
 +              if (unit->system == USER_UNIT_NONE) {
 +                      BLI_snprintf(numstr, numstr_size, "%.*f", prec, ruler_len);
 +              }
 +              else {
 +                      bUnit_AsString(numstr, numstr_size,
 +                                     (double)(ruler_len * unit->scale_length),
 +                                     prec, unit->system, B_UNIT_LENGTH, do_split, false);
 +              }
 +      }
 +}
 +
 +static bool view3d_ruler_pick(
 +        wmGizmoGroup *gzgroup, RulerItem *ruler_item, const float mval[2],
 +        int *r_co_index)
 +{
 +      RulerInfo *ruler_info = gzgroup->customdata;
 +      ARegion *ar = ruler_info->ar;
 +      bool found = false;
 +
 +      float dist_best = RULER_PICK_DIST_SQ;
 +      int co_index_best = -1;
 +
 +      {
 +              float co_ss[3][2];
 +              float dist;
 +              int j;
 +
 +              /* should these be checked? - ok for now not to */
 +              for (j = 0; j < 3; j++) {
 +                      ED_view3d_project_float_global(ar, ruler_item->co[j], co_ss[j], V3D_PROJ_TEST_NOP);
 +              }
 +
 +              if (ruler_item->flag & RULERITEM_USE_ANGLE) {
 +                      dist = min_ff(dist_squared_to_line_segment_v2(mval, co_ss[0], co_ss[1]),
 +                                    dist_squared_to_line_segment_v2(mval, co_ss[1], co_ss[2]));
 +                      if (dist < dist_best) {
 +                              dist_best = dist;
 +                              found = true;
 +
 +                              {
 +                                      const float dist_points[3] = {
 +                                          len_squared_v2v2(co_ss[0], mval),
 +                                          len_squared_v2v2(co_ss[1], mval),
 +                                          len_squared_v2v2(co_ss[2], mval),
 +                                      };
 +                                      if (min_fff(UNPACK3(dist_points)) < RULER_PICK_DIST_SQ) {
 +                                              co_index_best = min_axis_v3(dist_points);
 +                                      }
 +                                      else {
 +                                              co_index_best = -1;
 +                                      }
 +                              }
 +                      }
 +              }
 +              else {
 +                      dist = dist_squared_to_line_segment_v2(mval, co_ss[0], co_ss[2]);
 +                      if (dist < dist_best) {
 +                              dist_best = dist;
 +                              found = true;
 +
 +                              {
 +                                      const float dist_points[2] = {
 +                                          len_squared_v2v2(co_ss[0], mval),
 +                                          len_squared_v2v2(co_ss[2], mval),
 +                                      };
 +                                      if (min_ff(UNPACK2(dist_points)) < RULER_PICK_DIST_SQ) {
 +                                              co_index_best = (dist_points[0] < dist_points[1]) ? 0 : 2;
 +                                      }
 +                                      else {
 +                                              co_index_best = -1;
 +                                      }
 +                              }
 +                      }
 +              }
 +      }
 +
 +      *r_co_index = co_index_best;
 +      return found;
 +}
 +
 +/**
 + * Ensure the 'snap_context' is only cached while dragging,
 + * needed since the user may toggle modes between tool use.
 + */
 +static void ruler_state_set(bContext *C, RulerInfo *ruler_info, int state)
 +{
 +      Main *bmain = CTX_data_main(C);
 +      if (state == ruler_info->state) {
 +              return;
 +      }
 +
 +      /* always remove */
 +      if (ruler_info->snap_context) {
 +              ED_transform_snap_object_context_destroy(ruler_info->snap_context);
 +              ruler_info->snap_context = NULL;
 +      }
 +
 +      if (state == RULER_STATE_NORMAL) {
 +              /* pass */
 +      }
 +      else if (state == RULER_STATE_DRAG) {
 +              ruler_info->snap_context = ED_transform_snap_object_context_create_view3d(
 +                      bmain, CTX_data_scene(C), CTX_data_depsgraph(C), 0,
 +                      ruler_info->ar, CTX_wm_view3d(C));
 +      }
 +      else {
 +              BLI_assert(0);
 +      }
 +
 +      ruler_info->state = state;
 +}
 +
 +static void view3d_ruler_item_project(
 +        RulerInfo *ruler_info, float r_co[3],
 +        const int xy[2])
 +{
 +      ED_view3d_win_to_3d_int(ruler_info->sa->spacedata.first, ruler_info->ar, r_co, xy, r_co);
 +}
 +
 +/* use for mousemove events */
 +static bool view3d_ruler_item_mousemove(
 +        RulerInfo *ruler_info, RulerItem *ruler_item, const int mval[2],
 +        const bool do_thickness, const bool do_snap)
 +{
 +      RulerInteraction *inter = ruler_item->gz.interaction_data;
 +      const float eps_bias = 0.0002f;
 +      float dist_px = MVAL_MAX_PX_DIST * U.pixelsize;  /* snap dist */
 +
 +      ruler_info->snap_flag &= ~RULER_SNAP_OK;
 +
 +      if (ruler_item) {
 +              float *co = ruler_item->co[inter->co_index];
 +              /* restore the initial depth */
 +              copy_v3_v3(co, inter->drag_start_co);
 +              view3d_ruler_item_project(ruler_info, co, mval);
 +              if (do_thickness && inter->co_index != 1) {
 +                      // Scene *scene = CTX_data_scene(C);
 +                      // View3D *v3d = ruler_info->sa->spacedata.first;
 +                      const float mval_fl[2] = {UNPACK2(mval)};
 +                      float ray_normal[3];
 +                      float ray_start[3];
 +                      float *co_other;
 +
 +                      co_other = ruler_item->co[inter->co_index == 0 ? 2 : 0];
 +
 +                      if (ED_transform_snap_object_project_view3d(
 +                              ruler_info->snap_context,
 +                              SCE_SNAP_MODE_FACE,
 +                              &(const struct SnapObjectParams){
 +                                  .snap_select = SNAP_ALL,
 +                                  .use_object_edit_cage = true,
 +                              },
 +                              mval_fl, &dist_px,
 +                              co, ray_normal))
 +                      {
 +                              negate_v3(ray_normal);
 +                              /* add some bias */
 +                              madd_v3_v3v3fl(ray_start, co, ray_normal, eps_bias);
 +                              ED_transform_snap_object_project_ray(
 +                                      ruler_info->snap_context,
 +                                      &(const struct SnapObjectParams){
 +                                          .snap_select = SNAP_ALL,
 +                                          .use_object_edit_cage = true,
 +                                      },
 +                                      ray_start, ray_normal, NULL,
 +                                      co_other, NULL);
 +                      }
 +              }
 +              else if (do_snap) {
 +                      const float mval_fl[2] = {UNPACK2(mval)};
 +
 +                      if (ED_transform_snap_object_project_view3d(
 +                              ruler_info->snap_context,
 +                              (SCE_SNAP_MODE_VERTEX | SCE_SNAP_MODE_EDGE | SCE_SNAP_MODE_FACE),
 +                              &(const struct SnapObjectParams){
 +                                  .snap_select = SNAP_ALL,
 +                                  .use_object_edit_cage = true,
 +                                  .use_occlusion_test = true,
 +                              },
 +                              mval_fl, &dist_px,
 +                              co, NULL))
 +                      {
 +                              ruler_info->snap_flag |= RULER_SNAP_OK;
 +                      }
 +              }
 +              return true;
 +      }
 +      else {
 +              return false;
 +      }
 +}
 +
 +
 +/** \} */
 +
 +/* -------------------------------------------------------------------- */
 +/** \name Ruler/Grease Pencil Conversion
 + * \{ */
 +
 +#define RULER_ID "RulerData3D"
 +static bool view3d_ruler_to_gpencil(bContext *C, wmGizmoGroup *gzgroup)
 +{
 +      // RulerInfo *ruler_info = gzgroup->customdata;
 +      Main *bmain = CTX_data_main(C);
 +      Scene *scene = CTX_data_scene(C);
 +
 +      bGPdata *gpd;
 +      bGPDlayer *gpl;
 +      bGPDframe *gpf;
 +      bGPDstroke *gps;
 +      RulerItem *ruler_item;
 +      const char *ruler_name = RULER_ID;
 +      bool changed = false;
 +
 +      if (scene->gpd == NULL) {
 +              scene->gpd = BKE_gpencil_data_addnew(bmain, "Annotations");
 +      }
 +      gpd = scene->gpd;
 +
 +      gpl = BLI_findstring(&gpd->layers, ruler_name, offsetof(bGPDlayer, info));
 +      if (gpl == NULL) {
 +              gpl = BKE_gpencil_layer_addnew(gpd, ruler_name, false);
 +              copy_v4_v4(gpl->color, U.gpencil_new_layer_col);
 +              gpl->thickness = 1;
 +              gpl->flag |= GP_LAYER_HIDE;
 +      }
 +
 +      gpf = BKE_gpencil_layer_getframe(gpl, CFRA, GP_GETFRAME_ADD_NEW);
 +      BKE_gpencil_free_strokes(gpf);
 +
 +      for (ruler_item = gzgroup->gizmos.first; ruler_item; ruler_item = (RulerItem *)ruler_item->gz.next) {
 +              bGPDspoint *pt;
 +              int j;
 +
 +              /* allocate memory for a new stroke */
 +              gps = MEM_callocN(sizeof(bGPDstroke), "gp_stroke");
 +              if (ruler_item->flag & RULERITEM_USE_ANGLE) {
 +                      gps->totpoints = 3;
 +                      pt = gps->points = MEM_callocN(sizeof(bGPDspoint) * gps->totpoints, "gp_stroke_points");
 +                      for (j = 0; j < 3; j++) {
 +                              copy_v3_v3(&pt->x, ruler_item->co[j]);
 +                              pt->pressure = 1.0f;
 +                              pt->strength = 1.0f;
 +                              pt++;
 +                      }
 +              }
 +              else {
 +                      gps->totpoints = 2;
 +                      pt = gps->points = MEM_callocN(sizeof(bGPDspoint) * gps->totpoints, "gp_stroke_points");
 +                      for (j = 0; j < 3; j += 2) {
 +                              copy_v3_v3(&pt->x, ruler_item->co[j]);
 +                              pt->pressure = 1.0f;
 +                              pt->strength = 1.0f;
 +                              pt++;
 +                      }
 +              }
 +              gps->flag = GP_STROKE_3DSPACE;
 +              gps->thickness = 3;
 +
 +              BLI_addtail(&gpf->strokes, gps);
 +              changed = true;
 +      }
 +
 +      return changed;
 +}
 +
 +static bool view3d_ruler_from_gpencil(const bContext *C, wmGizmoGroup *gzgroup)
 +{
 +      Scene *scene = CTX_data_scene(C);
 +      bool changed = false;
 +
 +      if (scene->gpd) {
 +              bGPDlayer *gpl;
 +              const char *ruler_name = RULER_ID;
 +              gpl = BLI_findstring(&scene->gpd->layers, ruler_name, offsetof(bGPDlayer, info));
 +              if (gpl) {
 +                      bGPDframe *gpf;
 +                      gpf = BKE_gpencil_layer_getframe(gpl, CFRA, GP_GETFRAME_USE_PREV);
 +                      if (gpf) {
 +                              bGPDstroke *gps;
 +                              for (gps = gpf->strokes.first; gps; gps = gps->next) {
 +                                      bGPDspoint *pt = gps->points;
 +                                      int j;
 +                                      RulerItem *ruler_item = NULL;
 +                                      if (gps->totpoints == 3) {
 +                                              ruler_item = ruler_item_add(gzgroup);
 +                                              for (j = 0; j < 3; j++) {
 +                                                      copy_v3_v3(ruler_item->co[j], &pt->x);
 +                                                      pt++;
 +                                              }
 +                                              ruler_item->flag |= RULERITEM_USE_ANGLE;
 +                                              changed = true;
 +                                      }
 +                                      else if (gps->totpoints == 2) {
 +                                              ruler_item = ruler_item_add(gzgroup);
 +                                              for (j = 0; j < 3; j += 2) {
 +                                                      copy_v3_v3(ruler_item->co[j], &pt->x);
 +                                                      pt++;
 +                                              }
 +                                              changed = true;
 +                                      }
 +                              }
 +                      }
 +              }
 +      }
 +
 +      return changed;
 +}
 +
 +/** \} */
 +
 +/* -------------------------------------------------------------------- */
 +/** \name Ruler Item Gizmo Type
 + * \{ */
 +
 +static void gizmo_ruler_draw(const bContext *C, wmGizmo *gz)
 +{
 +      Scene *scene = CTX_data_scene(C);
 +      UnitSettings *unit = &scene->unit;
 +      RulerInfo *ruler_info = gz->parent_gzgroup->customdata;
 +      RulerItem *ruler_item = (RulerItem *)gz;
 +      ARegion *ar = ruler_info->ar;
 +      RegionView3D *rv3d = ar->regiondata;
 +      const float cap_size = 4.0f;
 +      const float bg_margin = 4.0f * U.pixelsize;
 +      const float bg_radius = 4.0f * U.pixelsize;
 +      const float arc_size = 64.0f * U.pixelsize;
 +#define ARC_STEPS 24
 +      const int arc_steps = ARC_STEPS;
 +      const float color_act[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 +      const float color_base[4] = {0.0f, 0.0f, 0.0f, 1.0f};
 +      unsigned char color_text[3];
 +      unsigned char color_wire[3];
 +      float color_back[4] = {1.0f, 1.0f, 1.0f, 0.5f};
 +
 +      /* anti-aliased lines for more consistent appearance */
 +      GPU_line_smooth(true);
 +
 +      BLF_enable(blf_mono_font, BLF_ROTATION);
 +      BLF_size(blf_mono_font, 14 * U.pixelsize, U.dpi);
 +      BLF_rotation(blf_mono_font, 0.0f);
 +
 +      UI_GetThemeColor3ubv(TH_TEXT, color_text);
 +      UI_GetThemeColor3ubv(TH_WIRE, color_wire);
 +
 +      const bool is_act = (gz->flag & WM_GIZMO_DRAW_HOVER);
 +      float dir_ruler[2];
 +      float co_ss[3][2];
 +      int j;
 +
 +      /* should these be checked? - ok for now not to */
 +      for (j = 0; j < 3; j++) {
 +              ED_view3d_project_float_global(ar, ruler_item->co[j], co_ss[j], V3D_PROJ_TEST_NOP);
 +      }
 +
 +      GPU_blend(true);
 +
 +      const uint shdr_pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 +
 +      if (ruler_item->flag & RULERITEM_USE_ANGLE) {
 +              immBindBuiltinProgram(GPU_SHADER_2D_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", 2);  /* "advanced" mode */
 +              const float *col = is_act ? color_act : color_base;
 +              immUniformArray4fv("colors", (float *)(float[][4]){{0.67f, 0.67f, 0.67f, 1.0f}, {col[0], col[1], col[2], col[3]}}, 2);
 +              immUniform1f("dash_width", 6.0f);
 +
 +              immBegin(GPU_PRIM_LINE_STRIP, 3);
 +
 +              immVertex2fv(shdr_pos, co_ss[0]);
 +              immVertex2fv(shdr_pos, co_ss[1]);
 +              immVertex2fv(shdr_pos, co_ss[2]);
 +
 +              immEnd();
 +
 +              immUnbindProgram();
 +
 +              immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
 +
 +              /* arc */
 +              {
 +                      float dir_tmp[3];
 +                      float co_tmp[3];
 +                      float arc_ss_coord[2];
 +
 +                      float dir_a[3];
 +                      float dir_b[3];
 +                      float quat[4];
 +                      float axis[3];
 +                      float angle;
++                      const float px_scale = (ED_view3d_pixel_size_no_ui_scale(rv3d, ruler_item->co[1]) *
 +                                              min_fff(arc_size,
 +                                                      len_v2v2(co_ss[0], co_ss[1]) / 2.0f,
 +                                                      len_v2v2(co_ss[2], co_ss[1]) / 2.0f));
 +
 +                      sub_v3_v3v3(dir_a, ruler_item->co[0], ruler_item->co[1]);
 +                      sub_v3_v3v3(dir_b, ruler_item->co[2], ruler_item->co[1]);
 +                      normalize_v3(dir_a);
 +                      normalize_v3(dir_b);
 +
 +                      cross_v3_v3v3(axis, dir_a, dir_b);
 +                      angle = angle_normalized_v3v3(dir_a, dir_b);
 +
 +                      axis_angle_to_quat(quat, axis, angle / arc_steps);
 +
 +                      copy_v3_v3(dir_tmp, dir_a);
 +
 +                      immUniformColor3ubv(color_wire);
 +
 +                      immBegin(GPU_PRIM_LINE_STRIP, arc_steps + 1);
 +
 +                      for (j = 0; j <= arc_steps; j++) {
 +                              madd_v3_v3v3fl(co_tmp, ruler_item->co[1], dir_tmp, px_scale);
 +                              ED_view3d_project_float_global(ar, co_tmp, arc_ss_coord, V3D_PROJ_TEST_NOP);
 +                              mul_qt_v3(quat, dir_tmp);
 +
 +                              immVertex2fv(shdr_pos, arc_ss_coord);
 +                      }
 +
 +                      immEnd();
 +              }
 +
 +              /* capping */
 +              {
 +                      float rot_90_vec_a[2];
 +                      float rot_90_vec_b[2];
 +                      float cap[2];
 +
 +                      sub_v2_v2v2(dir_ruler, co_ss[0], co_ss[1]);
 +                      rot_90_vec_a[0] = -dir_ruler[1];
 +                      rot_90_vec_a[1] =  dir_ruler[0];
 +                      normalize_v2(rot_90_vec_a);
 +
 +                      sub_v2_v2v2(dir_ruler, co_ss[1], co_ss[2]);
 +                      rot_90_vec_b[0] = -dir_ruler[1];
 +                      rot_90_vec_b[1] =  dir_ruler[0];
 +                      normalize_v2(rot_90_vec_b);
 +
 +                      GPU_blend(true);
 +
 +                      immUniformColor3ubv(color_wire);
 +
 +                      immBegin(GPU_PRIM_LINES, 8);
 +
 +                      madd_v2_v2v2fl(cap, co_ss[0], rot_90_vec_a, cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +                      madd_v2_v2v2fl(cap, co_ss[0], rot_90_vec_a, -cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +
 +                      madd_v2_v2v2fl(cap, co_ss[2], rot_90_vec_b, cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +                      madd_v2_v2v2fl(cap, co_ss[2], rot_90_vec_b, -cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +
 +                      /* angle vertex */
 +                      immVertex2f(shdr_pos, co_ss[1][0] - cap_size, co_ss[1][1] - cap_size);
 +                      immVertex2f(shdr_pos, co_ss[1][0] + cap_size, co_ss[1][1] + cap_size);
 +                      immVertex2f(shdr_pos, co_ss[1][0] - cap_size, co_ss[1][1] + cap_size);
 +                      immVertex2f(shdr_pos, co_ss[1][0] + cap_size, co_ss[1][1] - cap_size);
 +
 +                      immEnd();
 +
 +                      GPU_blend(false);
 +              }
 +
 +              immUnbindProgram();
 +
 +              /* text */
 +              {
 +                      char numstr[256];
 +                      float numstr_size[2];
 +                      float posit[2];
 +                      const int prec = 2;  /* XXX, todo, make optional */
 +
 +                      ruler_item_as_string(ruler_item, unit, numstr, sizeof(numstr), prec);
 +
 +                      BLF_width_and_height(blf_mono_font, numstr, sizeof(numstr), &numstr_size[0], &numstr_size[1]);
 +
 +                      posit[0] = co_ss[1][0] + (cap_size * 2.0f);
 +                      posit[1] = co_ss[1][1] - (numstr_size[1] / 2.0f);
 +
 +                      /* draw text (bg) */
 +                      UI_draw_roundbox_corner_set(UI_CNR_ALL);
 +                      UI_draw_roundbox_aa(
 +                              true,
 +                              posit[0] - bg_margin,                  posit[1] - bg_margin,
 +                              posit[0] + bg_margin + numstr_size[0], posit[1] + bg_margin + numstr_size[1],
 +                              bg_radius, color_back);
 +                      /* draw text */
 +                      BLF_color3ubv(blf_mono_font, color_text);
 +                      BLF_position(blf_mono_font, posit[0], posit[1], 0.0f);
 +                      BLF_rotation(blf_mono_font, 0.0f);
 +                      BLF_draw(blf_mono_font, numstr, sizeof(numstr));
 +              }
 +      }
 +      else {
 +              immBindBuiltinProgram(GPU_SHADER_2D_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", 2);  /* "advanced" mode */
 +              const float *col = is_act ? color_act : color_base;
 +              immUniformArray4fv("colors", (float *)(float[][4]){{0.67f, 0.67f, 0.67f, 1.0f}, {col[0], col[1], col[2], col[3]}}, 2);
 +              immUniform1f("dash_width", 6.0f);
 +
 +              immBegin(GPU_PRIM_LINES, 2);
 +
 +              immVertex2fv(shdr_pos, co_ss[0]);
 +              immVertex2fv(shdr_pos, co_ss[2]);
 +
 +              immEnd();
 +
 +              immUnbindProgram();
 +
 +              immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
 +
 +              sub_v2_v2v2(dir_ruler, co_ss[0], co_ss[2]);
 +
 +              /* capping */
 +              {
 +                      float rot_90_vec[2] = {-dir_ruler[1], dir_ruler[0]};
 +                      float cap[2];
 +
 +                      normalize_v2(rot_90_vec);
 +
 +                      GPU_blend(true);
 +
 +                      immUniformColor3ubv(color_wire);
 +
 +                      immBegin(GPU_PRIM_LINES, 4);
 +
 +                      madd_v2_v2v2fl(cap, co_ss[0], rot_90_vec, cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +                      madd_v2_v2v2fl(cap, co_ss[0], rot_90_vec, -cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +
 +                      madd_v2_v2v2fl(cap, co_ss[2], rot_90_vec, cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +                      madd_v2_v2v2fl(cap, co_ss[2], rot_90_vec, -cap_size);
 +                      immVertex2fv(shdr_pos, cap);
 +
 +                      immEnd();
 +
 +                      GPU_blend(false);
 +              }
 +
 +              immUnbindProgram();
 +
 +              /* text */
 +              {
 +                      char numstr[256];
 +                      float numstr_size[2];
 +                      const int prec = 6;  /* XXX, todo, make optional */
 +                      float posit[2];
 +
 +                      ruler_item_as_string(ruler_item, unit, numstr, sizeof(numstr), prec);
 +
 +                      BLF_width_and_height(blf_mono_font, numstr, sizeof(numstr), &numstr_size[0], &numstr_size[1]);
 +
 +                      mid_v2_v2v2(posit, co_ss[0], co_ss[2]);
 +
 +                      /* center text */
 +                      posit[0] -= numstr_size[0] / 2.0f;
 +                      posit[1] -= numstr_size[1] / 2.0f;
 +
 +                      /* draw text (bg) */
 +                      UI_draw_roundbox_corner_set(UI_CNR_ALL);
 +                      UI_draw_roundbox_aa(
 +                              true,
 +                              posit[0] - bg_margin,                  posit[1] - bg_margin,
 +                              posit[0] + bg_margin + numstr_size[0], posit[1] + bg_margin + numstr_size[1],
 +                              bg_radius, color_back);
 +                      /* draw text */
 +                      BLF_color3ubv(blf_mono_font, color_text);
 +                      BLF_position(blf_mono_font, posit[0], posit[1], 0.0f);
 +                      BLF_draw(blf_mono_font, numstr, sizeof(numstr));
 +              }
 +      }
 +
 +      GPU_line_smooth(false);
 +
 +      BLF_disable(blf_mono_font, BLF_ROTATION);
 +
 +#undef ARC_STEPS
 +
 +      /* draw snap */
 +      if ((ruler_info->snap_flag & RULER_SNAP_OK) &&
 +          (ruler_info->state == RULER_STATE_DRAG) &&
 +          (ruler_item->gz.interaction_data != NULL))
 +      {
 +              RulerInteraction *inter = ruler_item->gz.interaction_data;
 +              /* size from drawSnapping */
 +              const float size = 2.5f * UI_GetThemeValuef(TH_VERTEX_SIZE);
 +              float co_ss_snap[3];
 +              ED_view3d_project_float_global(ar, ruler_item->co[inter->co_index], co_ss_snap, V3D_PROJ_TEST_NOP);
 +
 +              uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 +
 +              immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
 +              immUniformColor4fv(color_act);
 +
 +              imm_draw_circle_wire_2d(pos, co_ss_snap[0], co_ss_snap[1], size * U.pixelsize, 32);
 +
 +              immUnbindProgram();
 +      }
 +}
 +
 +static int gizmo_ruler_test_select(
 +        bContext *UNUSED(C), wmGizmo *gz, const int mval[2])
 +{
 +      RulerItem *ruler_item_pick = (RulerItem *)gz;
 +      float mval_fl[2] = {UNPACK2(mval)};
 +      int co_index;
 +
 +      /* select and drag */
 +      if (view3d_ruler_pick(gz->parent_gzgroup, ruler_item_pick, mval_fl, &co_index)) {
 +              if (co_index == -1) {
 +                      if ((ruler_item_pick->flag & RULERITEM_USE_ANGLE) == 0) {
 +                              return PART_LINE;
 +                      }
 +              }
 +              else {
 +                      return co_index;
 +              }
 +      }
 +      return -1;
 +}
 +
 +static int gizmo_ruler_modal(
 +        bContext *C, wmGizmo *gz, const wmEvent *event,
 +        eWM_GizmoFlagTweak UNUSED(tweak_flag))
 +{
 +      bool do_draw = false;
 +      int exit_code = OPERATOR_RUNNING_MODAL;
 +      RulerInfo *ruler_info = gz->parent_gzgroup->customdata;
 +      RulerItem *ruler_item = (RulerItem *)gz;
 +      RulerInteraction *inter = ruler_item->gz.interaction_data;
 +      ARegion *ar = CTX_wm_region(C);
 +
 +      ruler_info->ar = ar;
 +
 +      switch (event->type) {
 +              case MOUSEMOVE:
 +              {
 +                      if (ruler_info->state == RULER_STATE_DRAG) {
 +                              if (view3d_ruler_item_mousemove(
 +                                      ruler_info, ruler_item, event->mval,
 +                                      event->shift != 0, event->ctrl != 0))
 +                              {
 +                                      do_draw = true;
 +                              }
 +                              inter->inside_region = BLI_rcti_isect_pt_v(&ar->winrct, &event->x);
 +                      }
 +                      break;
 +              }
 +      }
 +      if (do_draw) {
 +              ED_region_tag_redraw(ar);
 +      }
 +      return exit_code;
 +}
 +
 +static int gizmo_ruler_invoke(
 +        bContext *C, wmGizmo *gz, const wmEvent *event)
 +{
 +      wmGizmoGroup *gzgroup = gz->parent_gzgroup;
 +      RulerInfo *ruler_info = gzgroup->customdata;
 +      RulerItem *ruler_item_pick = (RulerItem *)gz;
 +      RulerInteraction *inter = MEM_callocN(sizeof(RulerInteraction), __func__);
 +      gz->interaction_data = inter;
 +
 +      ARegion *ar = ruler_info->ar;
 +
 +      const float mval_fl[2] = {UNPACK2(event->mval)};
 +
 +      /* select and drag */
 +      if (gz->highlight_part == PART_LINE) {
 +              if ((ruler_item_pick->flag & RULERITEM_USE_ANGLE) == 0) {
 +                      /* Add Center Point */
 +                      ruler_item_pick->flag |= RULERITEM_USE_ANGLE;
 +                      inter->co_index = 1;
 +                      ruler_state_set(C, ruler_info, RULER_STATE_DRAG);
 +
 +                      /* find the factor */
 +                      {
 +                              float co_ss[2][2];
 +                              float fac;
 +
 +                              ED_view3d_project_float_global(ar, ruler_item_pick->co[0], co_ss[0], V3D_PROJ_TEST_NOP);
 +                              ED_view3d_project_float_global(ar, ruler_item_pick->co[2], co_ss[1], V3D_PROJ_TEST_NOP);
 +
 +                              fac = line_point_factor_v2(mval_fl, co_ss[0], co_ss[1]);
 +                              CLAMP(fac, 0.0f, 1.0f);
 +
 +                              interp_v3_v3v3(ruler_item_pick->co[1],
 +                                             ruler_item_pick->co[0],
 +                                             ruler_item_pick->co[2], fac);
 +                      }
 +
 +                      /* update the new location */
 +                      view3d_ruler_item_mousemove(
 +                              ruler_info, ruler_item_pick, event->mval,
 +                              event->shift != 0, event->ctrl != 0);
 +              }
 +      }
 +      else {
 +              inter->co_index = gz->highlight_part;
 +              ruler_state_set(C, ruler_info, RULER_STATE_DRAG);
 +
 +              /* store the initial depth */
 +              copy_v3_v3(inter->drag_start_co, ruler_item_pick->co[inter->co_index]);
 +      }
 +
 +      return OPERATOR_RUNNING_MODAL;
 +}
 +
 +static void gizmo_ruler_exit(bContext *C, wmGizmo *gz, const bool cancel)
 +{
 +      wmGizmoGroup *gzgroup = gz->parent_gzgroup;
 +      RulerInfo *ruler_info = gzgroup->customdata;
 +
 +      if (!cancel) {
 +              if (ruler_info->state == RULER_STATE_DRAG) {
 +                      RulerItem *ruler_item = (RulerItem *)gz;
 +                      RulerInteraction *inter = gz->interaction_data;
 +                      /* rubber-band angle removal */
 +                      if (!inter->inside_region) {
 +                              if ((inter->co_index == 1) && (ruler_item->flag & RULERITEM_USE_ANGLE)) {
 +                                      ruler_item->flag &= ~RULERITEM_USE_ANGLE;
 +                              }
 +                              else {
 +                                      /* Not ideal, since the ruler isn't a mode and we don't want to override delete key
 +                                       * use dragging out of the view for removal. */
 +                                      ruler_item_remove(C, gzgroup, ruler_item);
 +                                      ruler_item = NULL;
 +                                      gz = NULL;
 +                                      inter = NULL;
 +                              }
 +                      }
 +                      if (ruler_info->snap_flag & RULER_SNAP_OK) {
 +                              ruler_info->snap_flag &= ~RULER_SNAP_OK;
 +                      }
 +                      ruler_state_set(C, ruler_info, RULER_STATE_NORMAL);
 +              }
 +              /* We could convert only the current gizmo, for now just re-generate. */
 +              view3d_ruler_to_gpencil(C, gzgroup);
 +      }
 +
 +      if (gz) {
 +              MEM_SAFE_FREE(gz->interaction_data);
 +      }
 +
 +      ruler_state_set(C, ruler_info, RULER_STATE_NORMAL);
 +}
 +
 +static int gizmo_ruler_cursor_get(wmGizmo *gz)
 +{
 +      if (gz->highlight_part == PART_LINE) {
 +              return BC_CROSSCURSOR;
 +      }
 +      return BC_NSEW_SCROLLCURSOR;
 +}
 +
 +void VIEW3D_GT_ruler_item(wmGizmoType *gzt)
 +{
 +      /* identifiers */
 +      gzt->idname = "VIEW3D_GT_ruler_item";
 +
 +      /* api callbacks */
 +      gzt->draw = gizmo_ruler_draw;
 +      gzt->test_select = gizmo_ruler_test_select;
 +      gzt->modal = gizmo_ruler_modal;
 +      gzt->invoke = gizmo_ruler_invoke;
 +      gzt->exit = gizmo_ruler_exit;
 +      gzt->cursor_get = gizmo_ruler_cursor_get;
 +
 +      gzt->struct_size = sizeof(RulerItem);
 +}
 +
 +/** \} */
 +
 +/* -------------------------------------------------------------------- */
 +/** \name Ruler Gizmo Group
 + * \{ */
 +
 +static bool WIDGETGROUP_ruler_poll(const bContext *C, wmGizmoGroupType *gzgt)
 +{
 +      bToolRef_Runtime *tref_rt = WM_toolsystem_runtime_from_context((bContext *)C);
 +      if ((tref_rt == NULL) ||
 +          !STREQ(gzgt->idname, tref_rt->gizmo_group))
 +      {
 +              WM_gizmo_group_type_unlink_delayed_ptr(gzgt);
 +              return false;
 +      }
 +      return true;
 +}
 +
 +static void WIDGETGROUP_ruler_setup(const bContext *C, wmGizmoGroup *gzgroup)
 +{
 +      RulerInfo *ruler_info = MEM_callocN(sizeof(RulerInfo), __func__);
 +
 +      if (view3d_ruler_from_gpencil(C, gzgroup)) {
 +              /* nop */
 +      }
 +
 +      wmWindow *win = CTX_wm_window(C);
 +      ScrArea *sa = CTX_wm_area(C);
 +      ARegion *ar = CTX_wm_region(C);
 +      ruler_info->win = win;
 +      ruler_info->sa = sa;
 +      ruler_info->ar = ar;
 +
 +      gzgroup->customdata = ruler_info;
 +}
 +
 +void VIEW3D_GGT_ruler(wmGizmoGroupType *gzgt)
 +{
 +      gzgt->name = "Ruler Widgets";
 +      gzgt->idname = view3d_gzgt_ruler_id;
 +
 +      gzgt->flag |= WM_GIZMOGROUPTYPE_SCALE | WM_GIZMOGROUPTYPE_DRAW_MODAL_ALL;
 +
 +      gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
 +      gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;
 +
 +      gzgt->poll = WIDGETGROUP_ruler_poll;
 +      gzgt->setup = WIDGETGROUP_ruler_setup;
 +}
 +
 +/** \} */
 +
 +/* -------------------------------------------------------------------- */
 +/** \name Add Ruler Operator
 + * \{ */
 +
 +static bool view3d_ruler_poll(bContext *C)
 +{
 +      bToolRef_Runtime *tref_rt = WM_toolsystem_runtime_from_context((bContext *)C);
 +      if ((tref_rt == NULL) ||
 +          !STREQ(view3d_gzgt_ruler_id, tref_rt->gizmo_group) ||
 +          CTX_wm_region_view3d(C) == NULL)
 +      {
 +              return false;
 +      }
 +      return true;
 +}
 +
 +static int view3d_ruler_add_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
 +{
 +      ARegion *ar = CTX_wm_region(C);
 +      View3D *v3d = CTX_wm_view3d(C);
 +      RegionView3D *rv3d = ar->regiondata;
 +
 +      wmGizmoMap *gzmap = ar->gizmo_map;
 +      wmGizmoGroup *gzgroup = WM_gizmomap_group_find(gzmap, view3d_gzgt_ruler_id);
 +      const bool use_depth = (v3d->shading.type >= OB_SOLID);
 +
 +      /* Create new line */
 +      RulerItem *ruler_item;
 +      ruler_item = ruler_item_add(gzgroup);
 +
 +      /* This is a little weak, but there is no real good way to tweak directly. */
 +      WM_gizmo_highlight_set(gzmap, &ruler_item->gz);
 +      if (WM_operator_name_call(
 +              C, "GIZMOGROUP_OT_gizmo_tweak",
 +              WM_OP_INVOKE_REGION_WIN, NULL) == OPERATOR_RUNNING_MODAL)
 +      {
 +              RulerInfo *ruler_info = gzgroup->customdata;
 +              RulerInteraction *inter = ruler_item->gz.interaction_data;
 +              if (use_depth) {
 +                      /* snap the first point added, not essential but handy */
 +                      inter->co_index = 0;
 +                      view3d_ruler_item_mousemove(ruler_info, ruler_item, event->mval, false, true);
 +                      copy_v3_v3(inter->drag_start_co, ruler_item->co[inter->co_index]);
 +              }
 +              else {
 +                      negate_v3_v3(inter->drag_start_co, rv3d->ofs);
 +                      copy_v3_v3(ruler_item->co[0], inter->drag_start_co);
 +                      view3d_ruler_item_project(ruler_info, ruler_item->co[0], event->mval);
 +              }
 +
 +              copy_v3_v3(ruler_item->co[2], ruler_item->co[0]);
 +              ruler_item->gz.highlight_part = inter->co_index = 2;
 +      }
 +      return OPERATOR_FINISHED;
 +}
 +
 +void VIEW3D_OT_ruler_add(wmOperatorType *ot)
 +{
 +      /* identifiers */
 +      ot->name = "Ruler Add";
 +      ot->idname = "VIEW3D_OT_ruler_add";
 +      ot->description = "";
 +
 +      ot->invoke = view3d_ruler_add_invoke;
 +      ot->poll = view3d_ruler_poll;
 +
 +      /* flags */
 +      ot->flag = OPTYPE_UNDO | OPTYPE_INTERNAL;
 +}
 +
 +/** \} */