src/game/level/level_editor/rect_layer.c

   1 #include <errno.h>
   2
   3 #include "game/camera.h"
   4 #include "system/lt.h"
   5 #include "system/stacktrace.h"
   6 #include "system/nth_alloc.h"
   7 #include "system/log.h"
   8 #include "math/rect.h"
   9 #include "color.h"
  10 #include "rect_layer.h"
  11 #include "dynarray.h"
  12 #include "system/line_stream.h"
  13 #include "color_picker.h"
  14 #include "system/str.h"
  15 #include "ui/edit_field.h"
  16 #include "undo_history.h"
  17 #include "game/level/action.h"
  18
  19 #define RECT_LAYER_SELECTION_THICCNESS 10.0f
  20 #define RECT_LAYER_ID_LABEL_SIZE vec(3.0f, 3.0f)
  21 #define CREATE_AREA_THRESHOLD 10.0
  22
  23 static int clipboard = 0;
  24 static Rect clipboard_rect;
  25 static Color clipboard_color;
  26
  27 typedef enum {
  28     RECT_LAYER_IDLE = 0,
  29     RECT_LAYER_CREATE,
  30     // TODO(#955): Rectangles in Level Editor have only one resize anchor to work with
  31     RECT_LAYER_RESIZE,
  32     RECT_LAYER_MOVE,
  33     RECT_LAYER_ID_RENAME,
  34     RECT_LAYER_RECOLOR
  35 } RectLayerState;
  36
  37 struct RectLayer {
  38     Lt *lt;
  39     RectLayerState state;
  40     Dynarray *ids;
  41     Dynarray *rects;
  42     Dynarray *colors;
  43     Dynarray *actions;
  44     ColorPicker color_picker;
  45     Vec2f create_begin;
  46     Vec2f create_end;
  47     int selection;
  48     Vec2f move_anchor;
  49     Edit_field *id_edit_field;
  50     Color inter_color;
  51     Rect inter_rect;
  52     int id_name_counter;
  53     const char *id_name_prefix;
  54 };
  55
  56 typedef enum {
  57     UNDO_ADD,
  58     UNDO_DELETE,
  59     UNDO_UPDATE,
  60     UNDO_SWAP
  61 } UndoType;
  62
  63 // Delete, Update
  64 typedef struct {
  65     UndoType type;
  66     RectLayer *layer;
  67     size_t index;
  68     Rect rect;
  69     Color color;
  70     Action action;
  71     char id[ENTITY_MAX_ID_SIZE];
  72 } UndoElementContext;
  73
  74 // Add
  75 typedef struct {
  76     UndoType type;
  77     RectLayer *layer;
  78     size_t index;
  79 } UndoAddContext;
  80
  81 // Swap
  82 typedef struct {
  83     UndoType type;
  84     RectLayer *layer;
  85     size_t index1;
  86     size_t index2;
  87 } UndoSwapContext;
  88
  89 typedef union {
  90     UndoType type;
  91     UndoAddContext add;
  92     UndoElementContext element;
  93     UndoSwapContext swap;
  94 } UndoContext;
  95
  96 static
  97 UndoContext create_undo_add_context(RectLayer *layer, size_t index)
  98 {
  99     trace_assert(layer);
 100     trace_assert(index < dynarray_count(layer->rects));
 101
 102     UndoContext undo_context;
 103     undo_context.add.type = UNDO_ADD;
 104     undo_context.add.layer = layer;
 105     undo_context.add.index = index;
 106     return undo_context;
 107 }
 108
 109 static
 110 UndoContext create_undo_element_context(RectLayer *layer)
 111 {
 112     trace_assert(layer);
 113     size_t index = (size_t) layer->selection;
 114     trace_assert(index < dynarray_count(layer->rects));
 115
 116     UndoContext undo_context;
 117     undo_context.element.layer = layer;
 118     undo_context.element.index = index;
 119     dynarray_copy_to(layer->rects, &undo_context.element.rect, index);
 120     dynarray_copy_to(layer->colors, &undo_context.element.color, index);
 121     dynarray_copy_to(layer->ids, undo_context.element.id, index);
 122     dynarray_copy_to(layer->actions, &undo_context.element.action, index);
 123     return undo_context;
 124 }
 125
 126 static
 127 UndoContext create_undo_update_context(RectLayer *rect_layer)
 128 {
 129     UndoContext undo_context = create_undo_element_context(rect_layer);
 130     undo_context.type = UNDO_UPDATE;
 131     return undo_context;
 132 }
 133
 134 static
 135 UndoContext create_undo_delete_context(RectLayer *rect_layer)
 136 {
 137     UndoContext undo_context = create_undo_element_context(rect_layer);
 138     undo_context.type = UNDO_DELETE;
 139     return undo_context;
 140 }
 141
 142 static
 143 UndoContext create_undo_swap_context(RectLayer *rect_layer, size_t index1, size_t index2)
 144 {
 145     UndoContext undo_context;
 146     undo_context.swap.type = UNDO_SWAP;
 147     undo_context.swap.layer = rect_layer;
 148     undo_context.swap.index1 = index1;
 149     undo_context.swap.index2 = index2;
 150     return undo_context;
 151 }
 152
 153 static
 154 void rect_layer_undo(void *context, size_t context_size)
 155 {
 156     trace_assert(context);
 157     trace_assert(sizeof(UndoContext) == context_size);
 158
 159     UndoContext *undo_context = context;
 160
 161     switch (undo_context->type) {
 162     case UNDO_ADD: {
 163         RectLayer *layer = undo_context->add.layer;
 164         dynarray_delete_at(layer->rects, undo_context->add.index);
 165         dynarray_delete_at(layer->colors, undo_context->add.index);
 166         dynarray_delete_at(layer->ids, undo_context->add.index);
 167         dynarray_delete_at(layer->actions, undo_context->add.index);
 168         layer->selection = -1;
 169     } break;
 170
 171     case UNDO_DELETE: {
 172         RectLayer *layer = undo_context->element.layer;
 173         dynarray_insert_before(layer->rects, undo_context->element.index, &undo_context->element.rect);
 174         dynarray_insert_before(layer->colors, undo_context->element.index, &undo_context->element.color);
 175         dynarray_insert_before(layer->ids, undo_context->element.index, &undo_context->element.id);
 176         dynarray_insert_before(layer->actions, undo_context->element.index, &undo_context->element.action);
 177         layer->selection = -1;
 178     } break;
 179
 180     case UNDO_UPDATE: {
 181         RectLayer *layer = undo_context->element.layer;
 182         dynarray_replace_at(layer->rects, undo_context->element.index, &undo_context->element.rect);
 183         dynarray_replace_at(layer->colors, undo_context->element.index, &undo_context->element.color);
 184         dynarray_replace_at(layer->ids, undo_context->element.index, &undo_context->element.id);
 185         dynarray_replace_at(layer->actions, undo_context->element.index, &undo_context->element.action);
 186     } break;
 187
 188     case UNDO_SWAP: {
 189         RectLayer *layer = undo_context->element.layer;
 190         dynarray_swap(layer->rects, undo_context->swap.index1, undo_context->swap.index2);
 191         dynarray_swap(layer->colors, undo_context->swap.index1, undo_context->swap.index2);
 192         dynarray_swap(layer->ids, undo_context->swap.index1, undo_context->swap.index2);
 193         dynarray_swap(layer->actions, undo_context->swap.index1, undo_context->swap.index2);
 194     } break;
 195     }
 196 }
 197
 198 #define UNDO_PUSH(HISTORY, CONTEXT)                                     \
 199     do {                                                                \
 200         UndoContext context = (CONTEXT);                                \
 201         undo_history_push(                                              \
 202             HISTORY,                                                    \
 203             rect_layer_undo,                                            \
 204             &context,                                                   \
 205             sizeof(context));                                           \
 206     } while(0)
 207
 208 static int rect_layer_add_rect(RectLayer *layer,
 209                                Rect rect,
 210                                Color color,
 211                                UndoHistory *undo_history)
 212 {
 213     trace_assert(layer);
 214
 215     if (dynarray_push(layer->rects, &rect) < 0) {
 216         return -1;
 217     }
 218
 219     if (dynarray_push(layer->colors, &color) < 0) {
 220         return -1;
 221     }
 222
 223     char id[ENTITY_MAX_ID_SIZE];
 224     snprintf(id, ENTITY_MAX_ID_SIZE, "%s_%d",
 225              layer->id_name_prefix,
 226              layer->id_name_counter++);
 227     if (dynarray_push(layer->ids, id)) {
 228         return -1;
 229     }
 230
 231     dynarray_push_empty(layer->actions);
 232
 233     UNDO_PUSH(
 234         undo_history,
 235         create_undo_add_context(
 236             layer,
 237             dynarray_count(layer->rects) - 1));
 238
 239     return 0;
 240 }
 241
 242 static int rect_layer_rect_at(RectLayer *layer, Vec2f position)
 243 {
 244     trace_assert(layer);
 245
 246     int n = (int) dynarray_count(layer->rects);
 247     Rect *rects = dynarray_data(layer->rects);
 248
 249     for (int i = n - 1; i >= 0; --i) {
 250         if (rect_contains_point(rects[i], position)) {
 251             return (int) i;
 252         }
 253     }
 254
 255     return -1;
 256 }
 257
 258 static void rect_layer_swap_elements(RectLayer *layer, size_t a, size_t b,
 259                                      UndoHistory *undo_history)
 260 {
 261     trace_assert(layer);
 262     trace_assert(a < dynarray_count(layer->rects));
 263     trace_assert(b < dynarray_count(layer->rects));
 264
 265     dynarray_swap(layer->rects, a, b);
 266     dynarray_swap(layer->colors, a, b);
 267     dynarray_swap(layer->ids, a, b);
 268     dynarray_swap(layer->actions, a, b);
 269
 270     UNDO_PUSH(undo_history, create_undo_swap_context(layer, a, b));
 271 }
 272
 273 static Rect rect_layer_resize_anchor(const Camera *camera, Rect boundary_rect)
 274 {
 275     const Rect overlay_rect =
 276         rect_scale(
 277             camera_rect(camera, boundary_rect),
 278             RECT_LAYER_SELECTION_THICCNESS * 0.5f);
 279
 280     return rect(
 281         overlay_rect.x + overlay_rect.w,
 282         overlay_rect.y + overlay_rect.h,
 283         RECT_LAYER_SELECTION_THICCNESS * 2.0f,
 284         RECT_LAYER_SELECTION_THICCNESS * 2.0f);
 285 }
 286
 287 static int rect_layer_delete_rect_at(RectLayer *layer,
 288                                      size_t i,
 289                                      UndoHistory *undo_history)
 290 {
 291     trace_assert(layer);
 292
 293     UNDO_PUSH(undo_history, create_undo_delete_context(layer));
 294
 295     dynarray_delete_at(layer->rects, i);
 296     dynarray_delete_at(layer->colors, i);
 297     dynarray_delete_at(layer->ids, i);
 298     dynarray_delete_at(layer->actions, i);
 299
 300     return 0;
 301 }
 302
 303 static int rect_layer_event_idle(RectLayer *layer,
 304                                  const SDL_Event *event,
 305                                  const Camera *camera,
 306                                  UndoHistory *undo_history)
 307 {
 308     trace_assert(layer);
 309     trace_assert(event);
 310     trace_assert(camera);
 311
 312     int color_changed = 0;
 313     if (color_picker_event(&layer->color_picker, event, camera, &color_changed) < 0) {
 314         return -1;
 315     }
 316
 317     if (color_changed) {
 318         if (layer->selection >= 0) {
 319             dynarray_copy_to(layer->colors, &layer->inter_color, (size_t)layer->selection);
 320             layer->state = RECT_LAYER_RECOLOR;
 321         }
 322         return 0;
 323     }
 324
 325     switch (event->type) {
 326     case SDL_MOUSEBUTTONDOWN: {
 327         switch (event->button.button) {
 328         case SDL_BUTTON_LEFT: {
 329             Vec2f position = camera_map_screen(
 330                 camera,
 331                 event->button.x,
 332                 event->button.y);
 333             int rect_at_position =
 334                 rect_layer_rect_at(layer, position);
 335
 336             Rect *rects = dynarray_data(layer->rects);
 337             Color *colors = dynarray_data(layer->colors);
 338
 339             if (layer->selection >= 0 && rect_contains_point(
 340                     rect_layer_resize_anchor(
 341                         camera,
 342                         rects[layer->selection]),
 343                     vec(
 344                         (float) event->button.x,
 345                         (float) event->button.y))) {
 346                 layer->state = RECT_LAYER_RESIZE;
 347                 dynarray_copy_to(layer->rects, &layer->inter_rect, (size_t) layer->selection);
 348             } else if (rect_at_position >= 0) {
 349                 layer->selection = rect_at_position;
 350                 layer->state = RECT_LAYER_MOVE;
 351                 layer->move_anchor =
 352                     vec_sub(
 353                         position,
 354                         vec(
 355                             rects[layer->selection].x,
 356                             rects[layer->selection].y));
 357                 layer->color_picker =
 358                     create_color_picker_from_rgba(colors[rect_at_position]);
 359
 360                 dynarray_copy_to(layer->rects, &layer->inter_rect, (size_t) rect_at_position);
 361             } else {
 362                 layer->selection = rect_at_position;
 363
 364                 if (layer->selection < 0) {
 365                     layer->state = RECT_LAYER_CREATE;
 366                     layer->create_begin = position;
 367                     layer->create_end = position;
 368                 }
 369             }
 370         } break;
 371         }
 372     } break;
 373
 374     case SDL_KEYDOWN: {
 375         switch (event->key.keysym.sym) {
 376         case SDLK_UP: {
 377             if ((event->key.keysym.mod & KMOD_SHIFT)
 378                 && (layer->selection >= 0)
 379                 && ((size_t)(layer->selection + 1) < dynarray_count(layer->rects))) {
 380                 rect_layer_swap_elements(
 381                     layer,
 382                     (size_t) layer->selection,
 383                     (size_t) layer->selection + 1,
 384                     undo_history);
 385                 layer->selection++;
 386             }
 387         } break;
 388
 389         case SDLK_DOWN: {
 390             if ((event->key.keysym.mod & KMOD_SHIFT)
 391                 && (layer->selection > 0)
 392                 && ((size_t) layer->selection < dynarray_count(layer->rects))) {
 393                 rect_layer_swap_elements(
 394                     layer,
 395                     (size_t) layer->selection,
 396                     (size_t) layer->selection - 1,
 397                     undo_history);
 398                 layer->selection--;
 399             }
 400         } break;
 401
 402         case SDLK_DELETE: {
 403             if (layer->selection >= 0) {
 404                 rect_layer_delete_rect_at(layer, (size_t) layer->selection, undo_history);
 405                 layer->selection = -1;
 406             }
 407         } break;
 408
 409         case SDLK_F2: {
 410             if (layer->selection >= 0) {
 411                 const char *ids = dynarray_data(layer->ids);
 412                 Color *colors = dynarray_data(layer->colors);
 413
 414                 edit_field_restyle(
 415                     layer->id_edit_field,
 416                     RECT_LAYER_ID_LABEL_SIZE,
 417                     color_invert(colors[layer->selection]));
 418
 419                 layer->state = RECT_LAYER_ID_RENAME;
 420                 edit_field_replace(
 421                     layer->id_edit_field,
 422                     ids + layer->selection * ENTITY_MAX_ID_SIZE);
 423                 SDL_StartTextInput();
 424             }
 425         } break;
 426
 427         case SDLK_c: {
 428             if ((event->key.keysym.mod & KMOD_LCTRL) && layer->selection >= 0) {
 429                 clipboard = 1;
 430                 dynarray_copy_to(layer->rects, &clipboard_rect, (size_t)layer->selection);
 431                 dynarray_copy_to(layer->colors, &clipboard_color, (size_t)layer->selection);
 432             }
 433         } break;
 434
 435         case SDLK_v: {
 436             if ((event->key.keysym.mod & KMOD_LCTRL) && clipboard) {
 437                 int x, y;
 438                 SDL_GetMouseState(&x, &y);
 439                 Vec2f position = camera_map_screen(camera, x, y);
 440
 441                 rect_layer_add_rect(
 442                     layer,
 443                     rect(position.x, position.y,
 444                          clipboard_rect.w, clipboard_rect.h),
 445                     clipboard_color,
 446                     undo_history);
 447             }
 448         } break;
 449         }
 450     } break;
 451     }
 452
 453     return 0;
 454 }
 455
 456 static int rect_layer_event_create(RectLayer *layer,
 457                                    const SDL_Event *event,
 458                                    const Camera *camera,
 459                                    UndoHistory *undo_history)
 460 {
 461     trace_assert(layer);
 462     trace_assert(event);
 463     trace_assert(camera);
 464
 465     switch (event->type) {
 466     case SDL_MOUSEBUTTONUP: {
 467         switch (event->button.button) {
 468         case SDL_BUTTON_LEFT: {
 469             const Rect real_rect =
 470                 rect_from_points(
 471                     layer->create_begin,
 472                     layer->create_end);
 473             const float area = real_rect.w * real_rect.h;
 474
 475             if (area >= CREATE_AREA_THRESHOLD) {
 476                 rect_layer_add_rect(
 477                     layer,
 478                     real_rect,
 479                     color_picker_rgba(&layer->color_picker),
 480                     undo_history);
 481             } else {
 482                 log_info("The area is too small %f. Such small box won't be created.\n", area);
 483             }
 484             layer->state = RECT_LAYER_IDLE;
 485         } break;
 486         }
 487     } break;
 488
 489     case SDL_MOUSEMOTION: {
 490         layer->create_end = camera_map_screen(
 491             camera,
 492             event->motion.x,
 493             event->motion.y);
 494     } break;
 495     }
 496     return 0;
 497 }
 498
 499 static int rect_layer_event_resize(RectLayer *layer,
 500                                    const SDL_Event *event,
 501                                    const Camera *camera,
 502                                    UndoHistory *undo_history)
 503 {
 504     trace_assert(layer);
 505     trace_assert(event);
 506     trace_assert(camera);
 507     trace_assert(layer->selection >= 0);
 508
 509     switch (event->type) {
 510     case SDL_MOUSEMOTION: {
 511         layer->inter_rect = rect_from_points(
 512             vec(layer->inter_rect.x, layer->inter_rect.y),
 513             vec_sum(
 514                 camera_map_screen(
 515                     camera,
 516                     event->button.x,
 517                     event->button.y),
 518                 vec(RECT_LAYER_SELECTION_THICCNESS * -0.5f,
 519                     RECT_LAYER_SELECTION_THICCNESS * -0.5f)));
 520     } break;
 521
 522     case SDL_MOUSEBUTTONUP: {
 523         layer->state = RECT_LAYER_IDLE;
 524         UNDO_PUSH(undo_history, create_undo_update_context(layer));
 525         dynarray_replace_at(layer->rects, (size_t) layer->selection, &layer->inter_rect);
 526     } break;
 527     }
 528
 529     return 0;
 530 }
 531
 532 static int rect_layer_event_move(RectLayer *layer,
 533                                  const SDL_Event *event,
 534                                  const Camera *camera,
 535                                  UndoHistory *undo_history)
 536 {
 537     trace_assert(layer);
 538     trace_assert(event);
 539     trace_assert(camera);
 540     trace_assert(layer->selection >= 0);
 541
 542     Rect *rects = dynarray_data(layer->rects);
 543
 544     switch (event->type) {
 545     case SDL_MOUSEMOTION: {
 546         Vec2f position = vec_sub(
 547             camera_map_screen(
 548                 camera,
 549                 event->button.x,
 550                 event->button.y),
 551             layer->move_anchor);
 552
 553         trace_assert(layer->selection >= 0);
 554
 555         layer->inter_rect.x = position.x;
 556         layer->inter_rect.y = position.y;
 557     } break;
 558
 559     case SDL_MOUSEBUTTONUP: {
 560         layer->state = RECT_LAYER_IDLE;
 561
 562         float distance = vec_length(
 563             vec_sub(rect_position(layer->inter_rect),
 564                     rect_position(rects[layer->selection])));
 565
 566         if (distance > 1e-6) {
 567             UNDO_PUSH(undo_history, create_undo_update_context(layer));
 568             dynarray_replace_at(layer->rects, (size_t) layer->selection, &layer->inter_rect);
 569         }
 570     } break;
 571     }
 572     return 0;
 573 }
 574
 575 static int rect_layer_event_id_rename(RectLayer *layer,
 576                                       const SDL_Event *event,
 577                                       const Camera *camera,
 578                                       UndoHistory *undo_history)
 579 {
 580     trace_assert(layer);
 581     trace_assert(event);
 582     trace_assert(camera);
 583     trace_assert(layer->selection >= 0);
 584
 585     switch (event->type) {
 586     case SDL_KEYDOWN: {
 587         switch (event->key.keysym.sym) {
 588         case SDLK_RETURN: {
 589             UNDO_PUSH(undo_history, create_undo_update_context(layer));
 590
 591             char *id = dynarray_pointer_at(layer->ids, (size_t)layer->selection);
 592             memset(id, 0, ENTITY_MAX_ID_SIZE);
 593             memcpy(id, edit_field_as_text(layer->id_edit_field), ENTITY_MAX_ID_SIZE - 1);
 594             layer->state = RECT_LAYER_IDLE;
 595             SDL_StopTextInput();
 596         } break;
 597
 598         case SDLK_ESCAPE: {
 599             layer->state = RECT_LAYER_IDLE;
 600             SDL_StopTextInput();
 601         } break;
 602         }
 603     } break;
 604     }
 605
 606     return edit_field_event(layer->id_edit_field, event);
 607 }
 608
 609 LayerPtr rect_layer_as_layer(RectLayer *rect_layer)
 610 {
 611     LayerPtr layer = {
 612         .type = LAYER_RECT,
 613         .ptr = rect_layer
 614     };
 615     return layer;
 616 }
 617
 618 RectLayer *create_rect_layer(const char *id_name_prefix)
 619 {
 620     Lt *lt = create_lt();
 621
 622     RectLayer *layer = PUSH_LT(lt, nth_calloc(1, sizeof(RectLayer)), free);
 623     if (layer == NULL) {
 624         RETURN_LT(lt, NULL);
 625     }
 626     layer->lt = lt;
 627
 628     layer->ids = PUSH_LT(
 629         lt,
 630         create_dynarray(sizeof(char) * ENTITY_MAX_ID_SIZE),
 631         destroy_dynarray);
 632     if (layer->ids == NULL) {
 633         RETURN_LT(lt, NULL);
 634     }
 635
 636     layer->rects = PUSH_LT(
 637         lt,
 638         create_dynarray(sizeof(Rect)),
 639         destroy_dynarray);
 640     if (layer->rects == NULL) {
 641         RETURN_LT(lt, NULL);
 642     }
 643
 644     layer->colors = PUSH_LT(
 645         lt,
 646         create_dynarray(sizeof(Color)),
 647         destroy_dynarray);
 648     if (layer->colors == NULL) {
 649         RETURN_LT(lt, NULL);
 650     }
 651
 652     layer->actions = PUSH_LT(
 653         lt,
 654         create_dynarray(sizeof(Action)),
 655         destroy_dynarray);
 656     if (layer->actions == NULL) {
 657         RETURN_LT(lt, NULL);
 658     }
 659
 660     layer->id_edit_field = PUSH_LT(
 661         lt,
 662         create_edit_field(
 663             RECT_LAYER_ID_LABEL_SIZE,
 664             COLOR_BLACK),
 665         destroy_edit_field);
 666     if (layer->id_edit_field == NULL) {
 667         RETURN_LT(lt, NULL);
 668     }
 669
 670     layer->color_picker = create_color_picker_from_rgba(rgba(1.0f, 0.0f, 0.0f, 1.0f));
 671     layer->selection = -1;
 672     layer->id_name_prefix = id_name_prefix;
 673
 674     return layer;
 675 }
 676
 677 RectLayer *create_rect_layer_from_line_stream(LineStream *line_stream, const char *id_name_prefix)
 678 {
 679     trace_assert(line_stream);
 680
 681     RectLayer *layer = create_rect_layer(id_name_prefix);
 682     if (layer == NULL) {
 683         return NULL;
 684     }
 685
 686     const char *line = line_stream_next(line_stream);
 687     if (line == NULL) {
 688         RETURN_LT(layer->lt, NULL);
 689     }
 690
 691     size_t count = 0;
 692     if (sscanf(line, "%zu", &count) < 0) {
 693         RETURN_LT(layer->lt, NULL);
 694     }
 695
 696     for (size_t i = 0; i < count; ++i) {
 697         line = line_stream_next(line_stream);
 698         if (line == NULL) {
 699             RETURN_LT(layer->lt, NULL);
 700         }
 701
 702         char hex[7];
 703         Rect rect;
 704         char id[ENTITY_MAX_ID_SIZE];
 705
 706         int n = 0;
 707         if (sscanf(line,
 708                    "%"STRINGIFY(ENTITY_MAX_ID_SIZE)"s%f%f%f%f%6s%n",
 709                    id,
 710                    &rect.x, &rect.y,
 711                    &rect.w, &rect.h,
 712                    hex, &n) <= 0) {
 713             log_fail("%s\n", strerror(errno));
 714             RETURN_LT(layer->lt, NULL);
 715         }
 716         line += n;
 717
 718         Color color = hexstr(hex);
 719         dynarray_push(layer->rects, &rect);
 720         dynarray_push(layer->ids, id);
 721         dynarray_push(layer->colors, &color);
 722
 723         Action action = {0};
 724
 725         if (sscanf(line, "%d%n", (int*)&action.type, &n) > 0) {
 726             line += n;
 727             switch (action.type) {
 728             case ACTION_NONE: break;
 729
 730             case ACTION_TOGGLE_GOAL:
 731             case ACTION_HIDE_LABEL: {
 732                 if (sscanf(line, "%"STRINGIFY(ENTITY_MAX_ID_SIZE)"s", action.entity_id) <= 0) {
 733                     log_fail("%s\n", strerror(errno));
 734                     RETURN_LT(layer->lt, NULL);
 735                 }
 736             } break;
 737             }
 738         }
 739
 740         dynarray_push(layer->actions, &action);
 741     }
 742
 743     return layer;
 744 }
 745
 746 void destroy_rect_layer(RectLayer *layer)
 747 {
 748     trace_assert(layer);
 749     RETURN_LT0(layer->lt);
 750 }
 751
 752 int rect_layer_render(const RectLayer *layer, const Camera *camera, int active)
 753 {
 754     trace_assert(layer);
 755     trace_assert(camera);
 756
 757     const size_t n = dynarray_count(layer->rects);
 758     Rect *rects = dynarray_data(layer->rects);
 759     Color *colors = dynarray_data(layer->colors);
 760     const char *ids = dynarray_data(layer->ids);
 761
 762     // The Rectangles
 763     for (size_t i = 0; i < n; ++i) {
 764         Rect rect = rects[i];
 765         Color color = colors[i];
 766
 767         if (layer->selection == (int) i) {
 768             if (layer->state == RECT_LAYER_RESIZE || layer->state == RECT_LAYER_MOVE) {
 769                 rect = layer->inter_rect;
 770             }
 771
 772             if (layer->state == RECT_LAYER_RECOLOR) {
 773                 color = layer->inter_color;
 774             }
 775         }
 776
 777         if (camera_fill_rect(
 778                 camera,
 779                 rect,
 780                 color_scale(
 781                     color,
 782                     rgba(1.0f, 1.0f, 1.0f, active ? 1.0f : 0.5f))) < 0) {
 783             return -1;
 784         }
 785
 786         // Selection Overlay
 787         if (active && (size_t) layer->selection == i) {
 788             const Rect overlay_rect =
 789                 rect_scale(
 790                     camera_rect(camera, rect),
 791                     RECT_LAYER_SELECTION_THICCNESS * 0.5f);
 792             const Color overlay_color = color_invert(color);
 793
 794             // Main Rectangle
 795             if (camera_fill_rect(
 796                     camera,
 797                     rect,
 798                     color_scale(
 799                         color,
 800                         rgba(1.0f, 1.0f, 1.0f, active ? 1.0f : 0.5f))) < 0) {
 801                 return -1;
 802             }
 803
 804             if (camera_draw_thicc_rect_screen(
 805                     camera,
 806                     overlay_rect,
 807                     overlay_color,
 808                     RECT_LAYER_SELECTION_THICCNESS) < 0) {
 809                 return -1;
 810             }
 811
 812             // Rectangle Id
 813             if (layer->state == RECT_LAYER_ID_RENAME) {
 814                 // ID renaming Edit Field
 815                 if (edit_field_render_world(
 816                         layer->id_edit_field,
 817                         camera,
 818                         rect_position(rect)) < 0) {
 819                     return -1;
 820                 }
 821             } else {
 822                 // Id text
 823                 if (camera_render_text(
 824                         camera,
 825                         ids + layer->selection * ENTITY_MAX_ID_SIZE,
 826                         RECT_LAYER_ID_LABEL_SIZE,
 827                         color_invert(color),
 828                         rect_position(rect)) < 0) {
 829                     return -1;
 830                 }
 831             }
 832
 833             // Resize Anchor
 834             if (camera_fill_rect_screen(
 835                     camera,
 836                     rect_layer_resize_anchor(camera, rect),
 837                     overlay_color) < 0) {
 838                 return -1;
 839             }
 840         }
 841     }
 842
 843     // Proto Rectangle
 844     const Color color = color_picker_rgba(&layer->color_picker);
 845     if (layer->state == RECT_LAYER_CREATE) {
 846         if (camera_fill_rect(camera, rect_from_points(layer->create_begin, layer->create_end), color) < 0) {
 847             return -1;
 848         }
 849     }
 850
 851     if (active && color_picker_render(&layer->color_picker, camera) < 0) {
 852         return -1;
 853     }
 854
 855     return 0;
 856 }
 857
 858 static
 859 int rect_layer_event_recolor(RectLayer *layer,
 860                              const SDL_Event *event,
 861                              const Camera *camera,
 862                              UndoHistory *undo_history)
 863 {
 864     trace_assert(layer);
 865     trace_assert(event);
 866     trace_assert(camera);
 867     trace_assert(undo_history);
 868     trace_assert(layer->selection >= 0);
 869
 870     int color_changed = 0;
 871     if (color_picker_event(&layer->color_picker, event, camera, &color_changed) < 0) {
 872         return -1;
 873     }
 874
 875     if (color_changed) {
 876         layer->inter_color = color_picker_rgba(&layer->color_picker);
 877
 878         if (!color_picker_drag(&layer->color_picker)) {
 879             UNDO_PUSH(undo_history, create_undo_update_context(layer));
 880             dynarray_replace_at(layer->colors, (size_t) layer->selection, &layer->inter_color);
 881             layer->state = RECT_LAYER_IDLE;
 882         }
 883     }
 884
 885     return 0;
 886 }
 887
 888 int rect_layer_event(RectLayer *layer,
 889                      const SDL_Event *event,
 890                      const Camera *camera,
 891                      UndoHistory *undo_history)
 892 {
 893     trace_assert(layer);
 894     trace_assert(event);
 895     trace_assert(undo_history);
 896
 897     switch (layer->state) {
 898     case RECT_LAYER_IDLE:
 899         return rect_layer_event_idle(layer, event, camera, undo_history);
 900
 901     case RECT_LAYER_CREATE:
 902         return rect_layer_event_create(layer, event, camera, undo_history);
 903
 904     case RECT_LAYER_RESIZE:
 905         return rect_layer_event_resize(layer, event, camera, undo_history);
 906
 907     case RECT_LAYER_MOVE:
 908         return rect_layer_event_move(layer, event, camera, undo_history);
 909
 910     case RECT_LAYER_ID_RENAME:
 911         return rect_layer_event_id_rename(layer, event, camera, undo_history);
 912
 913     case RECT_LAYER_RECOLOR:
 914         return rect_layer_event_recolor(layer, event, camera, undo_history);
 915     }
 916
 917     return 0;
 918 }
 919
 920 size_t rect_layer_count(const RectLayer *layer)
 921 {
 922     return dynarray_count(layer->rects);
 923 }
 924
 925 const Rect *rect_layer_rects(const RectLayer *layer)
 926 {
 927     return dynarray_data(layer->rects);
 928 }
 929
 930 const Color *rect_layer_colors(const RectLayer *layer)
 931 {
 932     return dynarray_data(layer->colors);
 933 }
 934
 935 const char *rect_layer_ids(const RectLayer *layer)
 936 {
 937     return dynarray_data(layer->ids);
 938 }
 939
 940 int rect_layer_dump_stream(const RectLayer *layer, FILE *filedump)
 941 {
 942     trace_assert(layer);
 943     trace_assert(filedump);
 944
 945     size_t n = dynarray_count(layer->ids);
 946     char *ids = dynarray_data(layer->ids);
 947     Rect *rects = dynarray_data(layer->rects);
 948     Color *colors = dynarray_data(layer->colors);
 949     Action *actions = dynarray_data(layer->actions);
 950
 951     fprintf(filedump, "%zd\n", n);
 952     for (size_t i = 0; i < n; ++i) {
 953         fprintf(filedump, "%s %f %f %f %f ",
 954                 ids + ENTITY_MAX_ID_SIZE * i,
 955                 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
 956         color_hex_to_stream(colors[i], filedump);
 957
 958         switch (actions[i].type) {
 959         case ACTION_NONE: {} break;
 960
 961         case ACTION_TOGGLE_GOAL:
 962         case ACTION_HIDE_LABEL: {
 963             fprintf(filedump, " %d %.*s",
 964                     (int)actions[i].type,
 965                     ENTITY_MAX_ID_SIZE, actions[i].entity_id);
 966         } break;
 967         }
 968
 969         fprintf(filedump, "\n");
 970     }
 971
 972     return 0;
 973 }
 974
 975 const Action *rect_layer_actions(const RectLayer *layer)
 976 {
 977     return dynarray_data(layer->actions);
 978 }