src/game/level/level_editor/rect_layer.c

   1 #include <float.h>
   2 #include <errno.h>
   3
   4 #include "game/camera.h"
   5 #include "system/lt.h"
   6 #include "system/stacktrace.h"
   7 #include "system/nth_alloc.h"
   8 #include "system/log.h"
   9 #include "math/rect.h"
  10 #include "color.h"
  11 #include "rect_layer.h"
  12 #include "dynarray.h"
  13 #include "system/line_stream.h"
  14 #include "color_picker.h"
  15 #include "system/str.h"
  16 #include "ui/edit_field.h"
  17 #include "undo_history.h"
  18 #include "game/level/action.h"
  19 #include "action_picker.h"
  20 #include "game.h"
  21
  22 #define RECT_LAYER_SELECTION_THICCNESS 15.0f
  23 #define RECT_LAYER_ID_LABEL_SIZE vec(3.0f, 3.0f)
  24 #define CREATE_AREA_THRESHOLD 10.0
  25 #define RECT_LAYER_GRID_ROWS 3
  26 #define RECT_LAYER_GRID_COLUMNS 4
  27
  28 static int clipboard = 0;
  29 static Rect clipboard_rect;
  30 static Color clipboard_color;
  31
  32 static Cursor_Style resize_styles[1 << RECT_SIDE_N] = {
  33     0,                         // [0]
  34     CURSOR_STYLE_RESIZE_VERT,  // [1]
  35     CURSOR_STYLE_RESIZE_HORIS, // [2]
  36     CURSOR_STYLE_RESIZE_DIAG1, // [3]
  37     CURSOR_STYLE_RESIZE_VERT,  // [4]
  38     0,                         // [5]
  39     CURSOR_STYLE_RESIZE_DIAG2, // [6]
  40     0,                         // [7]
  41     CURSOR_STYLE_RESIZE_HORIS, // [8]
  42     CURSOR_STYLE_RESIZE_DIAG2, // [9]
  43     0,                         // [10]
  44     0,                         // [11]
  45     CURSOR_STYLE_RESIZE_DIAG1  // [12]
  46 };
  47
  48 typedef enum {
  49     RECT_LAYER_IDLE = 0,
  50     RECT_LAYER_CREATE,
  51     RECT_LAYER_RESIZE,
  52     RECT_LAYER_MOVE,
  53     RECT_LAYER_ID_RENAME,
  54     RECT_LAYER_RECOLOR
  55 } RectLayerState;
  56
  57 struct RectLayer {
  58     Lt *lt;
  59     RectLayerState state;
  60     int resize_mask;
  61     Dynarray *ids;
  62     Dynarray *rects;
  63     Dynarray *colors;
  64     Dynarray *actions;
  65     ColorPicker color_picker;
  66     ActionPicker action_picker;
  67     Vec2f create_begin;
  68     Vec2f create_end;
  69     int selection;
  70     Vec2f move_anchor;          // The mouse offset from the left-top
  71                                 // corner of the rect during moving it
  72     Edit_field *id_edit_field;
  73     Color inter_color;
  74     Rect inter_rect;
  75     int id_name_counter;
  76     const char *id_name_prefix;
  77     Grid *grid;
  78     Cursor *cursor;
  79
  80     int snapping_enabled;
  81 };
  82
  83 typedef enum {
  84     UNDO_ADD,
  85     UNDO_DELETE,
  86     UNDO_UPDATE,
  87     UNDO_SWAP
  88 } UndoType;
  89
  90 // Delete, Update
  91 typedef struct {
  92     UndoType type;
  93     RectLayer *layer;
  94     size_t index;
  95     Rect rect;
  96     Color color;
  97     Action action;
  98     char id[ENTITY_MAX_ID_SIZE];
  99 } UndoElementContext;
 100
 101 // Add
 102 typedef struct {
 103     UndoType type;
 104     RectLayer *layer;
 105     size_t index;
 106 } UndoAddContext;
 107
 108 // Swap
 109 typedef struct {
 110     UndoType type;
 111     RectLayer *layer;
 112     size_t index1;
 113     size_t index2;
 114 } UndoSwapContext;
 115
 116 typedef union {
 117     UndoType type;
 118     UndoAddContext add;
 119     UndoElementContext element;
 120     UndoSwapContext swap;
 121 } UndoContext;
 122
 123 static
 124 UndoContext create_undo_add_context(RectLayer *layer, size_t index)
 125 {
 126     trace_assert(layer);
 127     trace_assert(index < dynarray_count(layer->rects));
 128
 129     UndoContext undo_context;
 130     undo_context.add.type = UNDO_ADD;
 131     undo_context.add.layer = layer;
 132     undo_context.add.index = index;
 133     return undo_context;
 134 }
 135
 136 static
 137 UndoContext create_undo_element_context(RectLayer *layer)
 138 {
 139     trace_assert(layer);
 140     size_t index = (size_t) layer->selection;
 141     trace_assert(index < dynarray_count(layer->rects));
 142
 143     UndoContext undo_context;
 144     undo_context.element.layer = layer;
 145     undo_context.element.index = index;
 146     dynarray_copy_to(layer->rects, &undo_context.element.rect, index);
 147     dynarray_copy_to(layer->colors, &undo_context.element.color, index);
 148     dynarray_copy_to(layer->ids, undo_context.element.id, index);
 149     dynarray_copy_to(layer->actions, &undo_context.element.action, index);
 150     return undo_context;
 151 }
 152
 153 static
 154 UndoContext create_undo_update_context(RectLayer *rect_layer)
 155 {
 156     UndoContext undo_context = create_undo_element_context(rect_layer);
 157     undo_context.type = UNDO_UPDATE;
 158     return undo_context;
 159 }
 160
 161 static
 162 UndoContext create_undo_delete_context(RectLayer *rect_layer)
 163 {
 164     UndoContext undo_context = create_undo_element_context(rect_layer);
 165     undo_context.type = UNDO_DELETE;
 166     return undo_context;
 167 }
 168
 169 static
 170 UndoContext create_undo_swap_context(RectLayer *rect_layer, size_t index1, size_t index2)
 171 {
 172     UndoContext undo_context;
 173     undo_context.swap.type = UNDO_SWAP;
 174     undo_context.swap.layer = rect_layer;
 175     undo_context.swap.index1 = index1;
 176     undo_context.swap.index2 = index2;
 177     return undo_context;
 178 }
 179
 180 static
 181 void rect_layer_undo(void *context, size_t context_size)
 182 {
 183     trace_assert(context);
 184     trace_assert(sizeof(UndoContext) == context_size);
 185
 186     UndoContext *undo_context = context;
 187
 188     switch (undo_context->type) {
 189     case UNDO_ADD: {
 190         RectLayer *layer = undo_context->add.layer;
 191         dynarray_delete_at(layer->rects, undo_context->add.index);
 192         dynarray_delete_at(layer->colors, undo_context->add.index);
 193         dynarray_delete_at(layer->ids, undo_context->add.index);
 194         dynarray_delete_at(layer->actions, undo_context->add.index);
 195         layer->selection = -1;
 196     } break;
 197
 198     case UNDO_DELETE: {
 199         RectLayer *layer = undo_context->element.layer;
 200         dynarray_insert_before(layer->rects, undo_context->element.index, &undo_context->element.rect);
 201         dynarray_insert_before(layer->colors, undo_context->element.index, &undo_context->element.color);
 202         dynarray_insert_before(layer->ids, undo_context->element.index, &undo_context->element.id);
 203         dynarray_insert_before(layer->actions, undo_context->element.index, &undo_context->element.action);
 204         layer->selection = -1;
 205     } break;
 206
 207     case UNDO_UPDATE: {
 208         RectLayer *layer = undo_context->element.layer;
 209         dynarray_replace_at(layer->rects, undo_context->element.index, &undo_context->element.rect);
 210         dynarray_replace_at(layer->colors, undo_context->element.index, &undo_context->element.color);
 211         dynarray_replace_at(layer->ids, undo_context->element.index, &undo_context->element.id);
 212         dynarray_replace_at(layer->actions, undo_context->element.index, &undo_context->element.action);
 213     } break;
 214
 215     case UNDO_SWAP: {
 216         RectLayer *layer = undo_context->element.layer;
 217         dynarray_swap(layer->rects, undo_context->swap.index1, undo_context->swap.index2);
 218         dynarray_swap(layer->colors, undo_context->swap.index1, undo_context->swap.index2);
 219         dynarray_swap(layer->ids, undo_context->swap.index1, undo_context->swap.index2);
 220         dynarray_swap(layer->actions, undo_context->swap.index1, undo_context->swap.index2);
 221     } break;
 222     }
 223 }
 224
 225 #define UNDO_PUSH(HISTORY, CONTEXT)                                     \
 226     do {                                                                \
 227         UndoContext context = (CONTEXT);                                \
 228         undo_history_push(                                              \
 229             HISTORY,                                                    \
 230             rect_layer_undo,                                            \
 231             &context,                                                   \
 232             sizeof(context));                                           \
 233     } while(0)
 234
 235 static int rect_layer_add_rect(RectLayer *layer,
 236                                Rect rect,
 237                                Color color,
 238                                UndoHistory *undo_history)
 239 {
 240     trace_assert(layer);
 241
 242     if (dynarray_push(layer->rects, &rect) < 0) {
 243         return -1;
 244     }
 245
 246     if (dynarray_push(layer->colors, &color) < 0) {
 247         return -1;
 248     }
 249
 250     char id[ENTITY_MAX_ID_SIZE];
 251     snprintf(id, ENTITY_MAX_ID_SIZE, "%s_%d",
 252              layer->id_name_prefix,
 253              layer->id_name_counter++);
 254     if (dynarray_push(layer->ids, id)) {
 255         return -1;
 256     }
 257
 258     dynarray_push_empty(layer->actions);
 259
 260     UNDO_PUSH(
 261         undo_history,
 262         create_undo_add_context(
 263             layer,
 264             dynarray_count(layer->rects) - 1));
 265
 266     return 0;
 267 }
 268
 269 static int rect_layer_rect_at(RectLayer *layer, Vec2f position)
 270 {
 271     trace_assert(layer);
 272
 273     int n = (int) dynarray_count(layer->rects);
 274     Rect *rects = dynarray_data(layer->rects);
 275
 276     for (int i = n - 1; i >= 0; --i) {
 277         if (rect_contains_point(rects[i], position)) {
 278             return (int) i;
 279         }
 280     }
 281
 282     return -1;
 283 }
 284
 285 static void rect_layer_swap_elements(RectLayer *layer, size_t a, size_t b,
 286                                      UndoHistory *undo_history)
 287 {
 288     trace_assert(layer);
 289     trace_assert(a < dynarray_count(layer->rects));
 290     trace_assert(b < dynarray_count(layer->rects));
 291
 292     dynarray_swap(layer->rects, a, b);
 293     dynarray_swap(layer->colors, a, b);
 294     dynarray_swap(layer->ids, a, b);
 295     dynarray_swap(layer->actions, a, b);
 296
 297     UNDO_PUSH(undo_history, create_undo_swap_context(layer, a, b));
 298 }
 299
 300 static int rect_layer_delete_rect_at(RectLayer *layer,
 301                                      size_t i,
 302                                      UndoHistory *undo_history)
 303 {
 304     trace_assert(layer);
 305
 306     UNDO_PUSH(undo_history, create_undo_delete_context(layer));
 307
 308     dynarray_delete_at(layer->rects, i);
 309     dynarray_delete_at(layer->colors, i);
 310     dynarray_delete_at(layer->ids, i);
 311     dynarray_delete_at(layer->actions, i);
 312
 313     return 0;
 314 }
 315
 316 static int calc_resize_mask(Vec2f point, Rect rect)
 317 {
 318     int mask = 0;
 319     for (Rect_side side = 0; side < RECT_SIDE_N; ++side) {
 320         if (rect_side_distance(rect, point, side) < RECT_LAYER_SELECTION_THICCNESS) {
 321             mask = mask | (1 << side);
 322         }
 323     }
 324     return mask;
 325 }
 326
 327 static int rect_layer_event_idle(RectLayer *layer,
 328                                  const SDL_Event *event,
 329                                  const Camera *camera,
 330                                  UndoHistory *undo_history)
 331 {
 332     trace_assert(layer);
 333     trace_assert(event);
 334     trace_assert(camera);
 335
 336     int color_changed = 0;
 337     if (color_picker_event(&layer->color_picker, event, camera, &color_changed) < 0) {
 338         return -1;
 339     }
 340
 341     if (color_changed) {
 342         if (layer->selection >= 0) {
 343             dynarray_copy_to(layer->colors, &layer->inter_color, (size_t)layer->selection);
 344             layer->state = RECT_LAYER_RECOLOR;
 345         }
 346         return 0;
 347     }
 348
 349     Rect *rects = dynarray_data(layer->rects);
 350
 351     switch (event->type) {
 352     case SDL_MOUSEBUTTONDOWN: {
 353         switch (event->button.button) {
 354         case SDL_BUTTON_LEFT: {
 355             Vec2f position = camera_map_screen(
 356                 camera,
 357                 event->button.x,
 358                 event->button.y);
 359             int rect_at_position =
 360                 rect_layer_rect_at(layer, position);
 361
 362
 363             Color *colors = dynarray_data(layer->colors);
 364
 365             if (layer->selection >= 0 &&
 366                 layer->selection == rect_at_position &&
 367                 (layer->resize_mask = calc_resize_mask(
 368                     vec((float) event->button.x, (float)event->button.y),
 369                     camera_rect(camera, rects[layer->selection])))) {
 370                 layer->state = RECT_LAYER_RESIZE;
 371                 dynarray_copy_to(layer->rects, &layer->inter_rect, (size_t) layer->selection);
 372             } else if (rect_at_position >= 0) {
 373                 layer->selection = rect_at_position;
 374                 layer->state = RECT_LAYER_MOVE;
 375                 layer->move_anchor = vec_sub(
 376                     position,
 377                     vec(
 378                         rects[layer->selection].x,
 379                         rects[layer->selection].y));
 380                 layer->color_picker =
 381                     create_color_picker_from_rgba(colors[rect_at_position]);
 382                 dynarray_copy_to(layer->rects, &layer->inter_rect, (size_t) rect_at_position);
 383             } else {
 384                 layer->selection = rect_at_position;
 385
 386                 if (layer->selection < 0) {
 387                     layer->state = RECT_LAYER_CREATE;
 388                     layer->create_begin = position;
 389                     layer->create_end = position;
 390                 }
 391             }
 392         } break;
 393         }
 394     } break;
 395
 396     case SDL_MOUSEMOTION: {
 397         int resize_mask = 0;
 398         Vec2f position = camera_map_screen(
 399             camera,
 400             event->button.x,
 401             event->button.y);
 402         if (layer->selection >= 0 &&
 403             layer->selection == rect_layer_rect_at(layer, position) &&
 404             (resize_mask = calc_resize_mask(
 405                 vec((float) event->button.x, (float)event->button.y),
 406                 camera_rect(camera, rects[layer->selection])))) {
 407             layer->cursor->style = resize_styles[resize_mask];
 408         } else {
 409             layer->cursor->style = CURSOR_STYLE_POINTER;
 410         }
 411     } break;
 412
 413     case SDL_KEYDOWN: {
 414         switch (event->key.keysym.sym) {
 415         case SDLK_UP: {
 416             if ((event->key.keysym.mod & KMOD_SHIFT)
 417                 && (layer->selection >= 0)
 418                 && ((size_t)(layer->selection + 1) < dynarray_count(layer->rects))) {
 419                 rect_layer_swap_elements(
 420                     layer,
 421                     (size_t) layer->selection,
 422                     (size_t) layer->selection + 1,
 423                     undo_history);
 424                 layer->selection++;
 425             }
 426         } break;
 427
 428         case SDLK_DOWN: {
 429             if ((event->key.keysym.mod & KMOD_SHIFT)
 430                 && (layer->selection > 0)
 431                 && ((size_t) layer->selection < dynarray_count(layer->rects))) {
 432                 rect_layer_swap_elements(
 433                     layer,
 434                     (size_t) layer->selection,
 435                     (size_t) layer->selection - 1,
 436                     undo_history);
 437                 layer->selection--;
 438             }
 439         } break;
 440
 441         case SDLK_DELETE: {
 442             if (layer->selection >= 0) {
 443                 rect_layer_delete_rect_at(layer, (size_t) layer->selection, undo_history);
 444                 layer->selection = -1;
 445             }
 446         } break;
 447
 448         case SDLK_F2: {
 449             if (layer->selection >= 0) {
 450                 const char *ids = dynarray_data(layer->ids);
 451                 Color *colors = dynarray_data(layer->colors);
 452
 453                 edit_field_restyle(
 454                     layer->id_edit_field,
 455                     RECT_LAYER_ID_LABEL_SIZE,
 456                     color_invert(colors[layer->selection]));
 457
 458                 layer->state = RECT_LAYER_ID_RENAME;
 459                 edit_field_replace(
 460                     layer->id_edit_field,
 461                     ids + layer->selection * ENTITY_MAX_ID_SIZE);
 462                 SDL_StartTextInput();
 463             }
 464         } break;
 465
 466         case SDLK_c: {
 467             if ((event->key.keysym.mod & KMOD_LCTRL) && layer->selection >= 0) {
 468                 clipboard = 1;
 469                 dynarray_copy_to(layer->rects, &clipboard_rect, (size_t)layer->selection);
 470                 dynarray_copy_to(layer->colors, &clipboard_color, (size_t)layer->selection);
 471             }
 472         } break;
 473
 474         case SDLK_v: {
 475             if ((event->key.keysym.mod & KMOD_LCTRL) && clipboard) {
 476                 int x, y;
 477                 SDL_GetMouseState(&x, &y);
 478                 Vec2f position = camera_map_screen(camera, x, y);
 479
 480                 rect_layer_add_rect(
 481                     layer,
 482                     rect(position.x, position.y,
 483                          clipboard_rect.w, clipboard_rect.h),
 484                     clipboard_color,
 485                     undo_history);
 486             }
 487         } break;
 488         }
 489     } break;
 490     }
 491
 492     return 0;
 493 }
 494
 495 static int rect_layer_event_create(RectLayer *layer,
 496                                    const SDL_Event *event,
 497                                    const Camera *camera,
 498                                    UndoHistory *undo_history)
 499 {
 500     trace_assert(layer);
 501     trace_assert(event);
 502     trace_assert(camera);
 503
 504     switch (event->type) {
 505     case SDL_MOUSEBUTTONUP: {
 506         switch (event->button.button) {
 507         case SDL_BUTTON_LEFT: {
 508             const Rect real_rect =
 509                 rect_from_points(
 510                     layer->create_begin,
 511                     layer->create_end);
 512             const float area = real_rect.w * real_rect.h;
 513
 514             if (area >= CREATE_AREA_THRESHOLD) {
 515                 rect_layer_add_rect(
 516                     layer,
 517                     real_rect,
 518                     color_picker_rgba(&layer->color_picker),
 519                     undo_history);
 520             } else {
 521                 log_info("The area is too small %f. Such small box won't be created.\n", area);
 522             }
 523             layer->state = RECT_LAYER_IDLE;
 524         } break;
 525         }
 526     } break;
 527
 528     case SDL_MOUSEMOTION: {
 529         layer->create_end = camera_map_screen(
 530             camera,
 531             event->motion.x,
 532             event->motion.y);
 533     } break;
 534     }
 535     return 0;
 536 }
 537
 538 static
 539 void snap_rect_resize_if_enabled(RectLayer *layer, Rect *a, float snapping_threshold)
 540 {
 541     trace_assert(layer);
 542     trace_assert(layer->selection >= 0);
 543     trace_assert(a);
 544
 545     if (!layer->snapping_enabled) return;
 546
 547     Rect *rects = dynarray_data(layer->rects);
 548     size_t rects_size = dynarray_count(layer->rects);
 549
 550     for (size_t i = 0; i < rects_size; ++i) {
 551         if (i == (size_t) layer->selection) continue;
 552
 553         const Rect b = rects[i];
 554
 555         if (segment_overlap(vec(a->x, a->x + a->w), vec(b.x, b.x + b.w))) {
 556             snap_var2seg(&a->y, b.y, 0, b.h, snapping_threshold);
 557         }
 558
 559         if (segment_overlap(vec(a->y, a->y + a->h), vec(b.y, b.y + b.h))) {
 560             snap_var2seg(&a->x, b.x, 0, b.w, snapping_threshold);
 561         }
 562     }
 563 }
 564
 565 static int rect_layer_event_resize(RectLayer *layer,
 566                                    const SDL_Event *event,
 567                                    const Camera *camera,
 568                                    UndoHistory *undo_history)
 569 {
 570     trace_assert(layer);
 571     trace_assert(event);
 572     trace_assert(camera);
 573     trace_assert(layer->selection >= 0);
 574
 575     Rect *rects = dynarray_data(layer->rects);
 576
 577     float scaled_snap_threshold = SNAPPING_THRESHOLD / camera->scale;
 578
 579     switch (event->type) {
 580     case SDL_MOUSEMOTION: {
 581         Vec2f position = camera_map_screen(
 582             camera,
 583             event->button.x,
 584             event->button.y);
 585
 586         switch (layer->resize_mask) {
 587         case 1: {               // TOP
 588             Rect a = rect(rects[layer->selection].x,
 589                           position.y,
 590                           rects[layer->selection].w,
 591                           rects[layer->selection].h);
 592
 593             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 594
 595             layer->inter_rect = rect_from_points(
 596                 vec(a.x, a.y),
 597                 rect_position2(rects[layer->selection]));
 598         } break;
 599
 600         case 2: {               // LEFT
 601             Rect a = rect(position.x,
 602                           rects[layer->selection].y,
 603                           rects[layer->selection].w,
 604                           rects[layer->selection].h);
 605
 606             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 607
 608             layer->inter_rect = rect_from_points(
 609                 vec(a.x, a.y),
 610                 rect_position2(rects[layer->selection]));
 611         } break;
 612
 613         case 3: {               // TOP,LEFT
 614             Rect a = rect(
 615                 position.x,
 616                 position.y,
 617                 rects[layer->selection].w,
 618                 rects[layer->selection].h);
 619
 620             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 621
 622             layer->inter_rect = rect_from_points(
 623                 vec(a.x, a.y),
 624                 rect_position2(rects[layer->selection]));
 625         } break;
 626
 627         case 4: {               // BOTTOM
 628             Rect a = rect(rects[layer->selection].x,
 629                           position.y,
 630                           rects[layer->selection].w,
 631                           rects[layer->selection].h);
 632
 633             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 634
 635             layer->inter_rect = rect_from_points(
 636                 rect_position(rects[layer->selection]),
 637                 vec(rects[layer->selection].x + rects[layer->selection].w,
 638                     a.y));
 639         } break;
 640
 641         case 6: {               // BOTTOM,LEFT
 642             Rect a = rect(
 643                 position.x,
 644                 position.y,
 645                 rects[layer->selection].w,
 646                 -rects[layer->selection].h);
 647
 648             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 649
 650             layer->inter_rect = rect_from_points(
 651                 vec(a.x, rects[layer->selection].y),
 652                 vec(rects[layer->selection].x + rects[layer->selection].w,
 653                     a.y));
 654         } break;
 655
 656         case 8: {               // RIGHT
 657             Rect a = rect(position.x,
 658                           rects[layer->selection].y,
 659                           rects[layer->selection].w,
 660                           rects[layer->selection].h);
 661
 662             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 663
 664             layer->inter_rect = rect_from_points(
 665                 rect_position(rects[layer->selection]),
 666                 vec(a.x, rects[layer->selection].y + rects[layer->selection].h));
 667         } break;
 668
 669         case 9: {               // TOP,RIGHT
 670             Rect a = rect(
 671                 position.x,
 672                 position.y,
 673                 -rects[layer->selection].w,
 674                 rects[layer->selection].h);
 675
 676             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 677
 678             layer->inter_rect = rect_from_points(
 679                 vec(rects[layer->selection].x, a.y),
 680                 vec(a.x,
 681                     rects[layer->selection].y + rects[layer->selection].h));
 682         } break;
 683
 684         case 12: {              // BOTTOM,RIGHT
 685             Rect a = rect(
 686                 position.x,
 687                 position.y,
 688                 -rects[layer->selection].w,
 689                 -rects[layer->selection].h);
 690
 691             snap_rect_resize_if_enabled(layer, &a, scaled_snap_threshold);
 692
 693             layer->inter_rect = rect_from_points(
 694                 rect_position(rects[layer->selection]),
 695                 vec(a.x, a.y));
 696         } break;
 697         }
 698
 699     } break;
 700
 701     case SDL_MOUSEBUTTONUP: {
 702         layer->state = RECT_LAYER_IDLE;
 703         UNDO_PUSH(undo_history, create_undo_update_context(layer));
 704         dynarray_replace_at(layer->rects, (size_t) layer->selection, &layer->inter_rect);
 705     } break;
 706     }
 707
 708     return 0;
 709 }
 710
 711 static
 712 void snap_rect_move_if_enabled(RectLayer *layer, Rect *a,
 713                                float snapping_threshold)
 714 {
 715     trace_assert(a);
 716     trace_assert(layer);
 717     trace_assert(layer->selection >= 0);
 718
 719     if (!layer->snapping_enabled) return;
 720
 721     Rect *rects = dynarray_data(layer->rects);
 722     size_t rects_size = dynarray_count(layer->rects);
 723
 724     for (size_t i = 0; i < rects_size; ++i) {
 725         if (i == (size_t) layer->selection) continue;
 726
 727         const Rect b = rects[i];
 728
 729         if (segment_overlap(vec(a->x, a->x + a->w), vec(b.x,  b.x  + b.w))) {
 730             snap_seg2seg(&a->y, b.y, a->h, b.h, snapping_threshold);
 731         }
 732
 733         if (segment_overlap(vec(a->y, a->y + a->h), vec(b.y,  b.y  + b.h))) {
 734             snap_seg2seg(&a->x, b.x, a->w, b.w, snapping_threshold);
 735         }
 736     }
 737 }
 738
 739 static int rect_layer_event_move(RectLayer *layer,
 740                                  const SDL_Event *event,
 741                                  const Camera *camera,
 742                                  UndoHistory *undo_history)
 743 {
 744     trace_assert(layer);
 745     trace_assert(event);
 746     trace_assert(camera);
 747     trace_assert(layer->selection >= 0);
 748
 749     Rect *rects = dynarray_data(layer->rects);
 750
 751     switch (event->type) {
 752     case SDL_MOUSEMOTION: {
 753         const Uint8 *state = SDL_GetKeyboardState(NULL);
 754         const Vec2f mouse_pos = vec_sub(
 755             camera_map_screen(
 756                 camera,
 757                 event->button.x,
 758                 event->button.y),
 759             layer->move_anchor);
 760
 761         if (!(state[SDL_SCANCODE_LCTRL] || state[SDL_SCANCODE_RCTRL])) {
 762             layer->inter_rect.x = mouse_pos.x;
 763             layer->inter_rect.y = mouse_pos.y;
 764         } else {
 765             const Vec2f rect_pos = rect_position(rects[layer->selection]);
 766
 767             const float dx = fabsf(rect_pos.x - mouse_pos.x);
 768             const float dy = fabsf(rect_pos.y - mouse_pos.y);
 769
 770             if (dx > dy) {
 771                 layer->inter_rect.x = mouse_pos.x;
 772                 layer->inter_rect.y = rect_pos.y;
 773             } else {
 774                 layer->inter_rect.x = rect_pos.x;
 775                 layer->inter_rect.y = mouse_pos.y;
 776             }
 777         }
 778
 779         snap_rect_move_if_enabled(layer, &layer->inter_rect,
 780                                   SNAPPING_THRESHOLD / camera->scale);
 781     } break;
 782
 783     case SDL_MOUSEBUTTONUP: {
 784         layer->state = RECT_LAYER_IDLE;
 785
 786         float distance = vec_length(
 787             vec_sub(rect_position(layer->inter_rect),
 788                     rect_position(rects[layer->selection])));
 789
 790         if (distance > 1e-6) {
 791             UNDO_PUSH(undo_history, create_undo_update_context(layer));
 792             dynarray_replace_at(layer->rects, (size_t) layer->selection, &layer->inter_rect);
 793         }
 794     } break;
 795     }
 796     return 0;
 797 }
 798
 799 static int rect_layer_event_id_rename(RectLayer *layer,
 800                                       const SDL_Event *event,
 801                                       const Camera *camera,
 802                                       UndoHistory *undo_history)
 803 {
 804     trace_assert(layer);
 805     trace_assert(event);
 806     trace_assert(camera);
 807     trace_assert(layer->selection >= 0);
 808
 809     switch (event->type) {
 810     case SDL_KEYDOWN: {
 811         switch (event->key.keysym.sym) {
 812         case SDLK_RETURN: {
 813             UNDO_PUSH(undo_history, create_undo_update_context(layer));
 814
 815             char *id = dynarray_pointer_at(layer->ids, (size_t)layer->selection);
 816             memset(id, 0, ENTITY_MAX_ID_SIZE);
 817             memcpy(id, edit_field_as_text(layer->id_edit_field), ENTITY_MAX_ID_SIZE - 1);
 818             layer->state = RECT_LAYER_IDLE;
 819             SDL_StopTextInput();
 820         } break;
 821
 822         case SDLK_ESCAPE: {
 823             layer->state = RECT_LAYER_IDLE;
 824             SDL_StopTextInput();
 825         } break;
 826         }
 827     } break;
 828     }
 829
 830     return edit_field_event(layer->id_edit_field, event);
 831 }
 832
 833 LayerPtr rect_layer_as_layer(RectLayer *rect_layer)
 834 {
 835     LayerPtr layer = {
 836         .type = LAYER_RECT,
 837         .ptr = rect_layer
 838     };
 839     return layer;
 840 }
 841
 842 RectLayer *create_rect_layer(const char *id_name_prefix, Cursor *cursor)
 843 {
 844     trace_assert(cursor);
 845
 846     Lt *lt = create_lt();
 847
 848     RectLayer *layer = PUSH_LT(lt, nth_calloc(1, sizeof(RectLayer)), free);
 849     if (layer == NULL) {
 850         RETURN_LT(lt, NULL);
 851     }
 852     layer->lt = lt;
 853
 854     layer->ids = PUSH_LT(
 855         lt,
 856         create_dynarray(sizeof(char) * ENTITY_MAX_ID_SIZE),
 857         destroy_dynarray);
 858     if (layer->ids == NULL) {
 859         RETURN_LT(lt, NULL);
 860     }
 861
 862     layer->rects = PUSH_LT(
 863         lt,
 864         create_dynarray(sizeof(Rect)),
 865         destroy_dynarray);
 866     if (layer->rects == NULL) {
 867         RETURN_LT(lt, NULL);
 868     }
 869
 870     layer->colors = PUSH_LT(
 871         lt,
 872         create_dynarray(sizeof(Color)),
 873         destroy_dynarray);
 874     if (layer->colors == NULL) {
 875         RETURN_LT(lt, NULL);
 876     }
 877
 878     layer->actions = PUSH_LT(
 879         lt,
 880         create_dynarray(sizeof(Action)),
 881         destroy_dynarray);
 882     if (layer->actions == NULL) {
 883         RETURN_LT(lt, NULL);
 884     }
 885
 886     layer->id_edit_field = PUSH_LT(
 887         lt,
 888         create_edit_field(
 889             RECT_LAYER_ID_LABEL_SIZE,
 890             COLOR_BLACK),
 891         destroy_edit_field);
 892     if (layer->id_edit_field == NULL) {
 893         RETURN_LT(lt, NULL);
 894     }
 895
 896     layer->grid =
 897         PUSH_LT(
 898             lt,
 899             nth_calloc(
 900                 1,
 901                 sizeof(Grid) + sizeof(Widget*) * RECT_LAYER_GRID_ROWS * RECT_LAYER_GRID_COLUMNS),
 902             free);
 903     if (layer->grid == NULL) {
 904         RETURN_LT(lt, NULL);
 905     }
 906     layer->grid->rows = RECT_LAYER_GRID_ROWS;
 907     layer->grid->columns = RECT_LAYER_GRID_COLUMNS;
 908     grid_put_widget(layer->grid, &layer->action_picker.widget, 0, RECT_LAYER_GRID_COLUMNS - 1);
 909
 910     layer->color_picker = create_color_picker_from_rgba(rgba(1.0f, 0.0f, 0.0f, 1.0f));
 911     layer->selection = -1;
 912     layer->id_name_prefix = id_name_prefix;
 913     layer->cursor = cursor;
 914
 915     return layer;
 916 }
 917
 918 RectLayer *create_rect_layer_from_line_stream(LineStream *line_stream,
 919                                               const char *id_name_prefix,
 920                                               Cursor *cursor)
 921 {
 922     trace_assert(line_stream);
 923
 924     RectLayer *layer = create_rect_layer(id_name_prefix, cursor);
 925     if (layer == NULL) {
 926         return NULL;
 927     }
 928
 929     const char *line = line_stream_next(line_stream);
 930     if (line == NULL) {
 931         RETURN_LT(layer->lt, NULL);
 932     }
 933
 934     size_t count = 0;
 935     if (sscanf(line, "%zu", &count) < 0) {
 936         RETURN_LT(layer->lt, NULL);
 937     }
 938
 939     for (size_t i = 0; i < count; ++i) {
 940         line = line_stream_next(line_stream);
 941         if (line == NULL) {
 942             RETURN_LT(layer->lt, NULL);
 943         }
 944
 945         char hex[7];
 946         Rect rect;
 947         char id[ENTITY_MAX_ID_SIZE];
 948
 949         int n = 0;
 950         if (sscanf(line,
 951                    "%"STRINGIFY(ENTITY_MAX_ID_SIZE)"s%f%f%f%f%6s%n",
 952                    id,
 953                    &rect.x, &rect.y,
 954                    &rect.w, &rect.h,
 955                    hex, &n) <= 0) {
 956             log_fail("%s\n", strerror(errno));
 957             RETURN_LT(layer->lt, NULL);
 958         }
 959         line += n;
 960
 961         Color color = hexstr(hex);
 962         dynarray_push(layer->rects, &rect);
 963         dynarray_push(layer->ids, id);
 964         dynarray_push(layer->colors, &color);
 965
 966         Action action = {
 967             .type = ACTION_NONE,
 968             .entity_id = {0}
 969         };
 970
 971         if (sscanf(line, "%d%n", (int*)&action.type, &n) > 0) {
 972             line += n;
 973             switch (action.type) {
 974             case ACTION_NONE: break;
 975
 976             case ACTION_TOGGLE_GOAL:
 977             case ACTION_HIDE_LABEL: {
 978                 if (sscanf(line, "%"STRINGIFY(ENTITY_MAX_ID_SIZE)"s", action.entity_id) <= 0) {
 979                     log_fail("%s\n", strerror(errno));
 980                     RETURN_LT(layer->lt, NULL);
 981                 }
 982             } break;
 983
 984             case ACTION_N: break;
 985             }
 986         }
 987
 988         dynarray_push(layer->actions, &action);
 989     }
 990
 991     return layer;
 992 }
 993
 994 void destroy_rect_layer(RectLayer *layer)
 995 {
 996     trace_assert(layer);
 997     RETURN_LT0(layer->lt);
 998 }
 999
1000 int rect_layer_render(const RectLayer *layer, const Camera *camera, int active)
1001 {
1002     trace_assert(layer);
1003     trace_assert(camera);
1004
1005     const size_t n = dynarray_count(layer->rects);
1006     Rect *rects = dynarray_data(layer->rects);
1007     Color *colors = dynarray_data(layer->colors);
1008     const char *ids = dynarray_data(layer->ids);
1009
1010     // The Rectangles
1011     for (size_t i = 0; i < n; ++i) {
1012         Rect rect = rects[i];
1013         Color color = colors[i];
1014
1015         if (layer->selection == (int) i) {
1016             if (layer->state == RECT_LAYER_RESIZE || layer->state == RECT_LAYER_MOVE) {
1017                 rect = layer->inter_rect;
1018             }
1019
1020             if (layer->state == RECT_LAYER_RECOLOR) {
1021                 color = layer->inter_color;
1022             }
1023         }
1024
1025         // Main Rectangle
1026         if (camera_fill_rect(
1027                 camera,
1028                 rect,
1029                 color_scale(
1030                     color,
1031                     rgba(1.0f, 1.0f, 1.0f, active ? 1.0f : 0.5f))) < 0) {
1032             return -1;
1033         }
1034     }
1035
1036     // Selection Overlay
1037     if (active && layer->selection >= 0) {
1038         Rect rect = rects[layer->selection];
1039         Color color = colors[layer->selection];
1040
1041         if (layer->state == RECT_LAYER_RESIZE || layer->state == RECT_LAYER_MOVE) {
1042             rect = layer->inter_rect;
1043         }
1044
1045         if (layer->state == RECT_LAYER_RECOLOR) {
1046             color = layer->inter_color;
1047         }
1048
1049         const Rect overlay_rect =
1050             rect_pad(
1051                 camera_rect(camera, rect),
1052                 -RECT_LAYER_SELECTION_THICCNESS * 0.5f);
1053         const Color overlay_color = color_invert(color);
1054
1055         // Selection
1056         if (camera_draw_thicc_rect_screen(
1057                 camera,
1058                 overlay_rect,
1059                 overlay_color,
1060                 RECT_LAYER_SELECTION_THICCNESS) < 0) {
1061             return -1;
1062         }
1063
1064         const Vec2f rect_id_pos = vec_sub(
1065             rect_position(rect),
1066             vec_mult(
1067                 RECT_LAYER_ID_LABEL_SIZE,
1068                 vec(0.0f, FONT_CHAR_HEIGHT)));
1069
1070         // Rectangle Id
1071         if (layer->state == RECT_LAYER_ID_RENAME) {
1072             // ID renaming Edit Field
1073             if (edit_field_render_world(
1074                     layer->id_edit_field,
1075                     camera,
1076                     rect_id_pos) < 0) {
1077                 return -1;
1078             }
1079         } else {
1080             // Id text
1081             if (camera_render_text(
1082                     camera,
1083                     ids + layer->selection * ENTITY_MAX_ID_SIZE,
1084                     RECT_LAYER_ID_LABEL_SIZE,
1085                     color_invert(color),
1086                     rect_id_pos) < 0) {
1087                 return -1;
1088             }
1089         }
1090     }
1091
1092     // Proto Rectangle
1093     const Color color = color_picker_rgba(&layer->color_picker);
1094     if (layer->state == RECT_LAYER_CREATE) {
1095         if (camera_fill_rect(camera, rect_from_points(layer->create_begin, layer->create_end), color) < 0) {
1096             return -1;
1097         }
1098     }
1099
1100     if (active && color_picker_render(&layer->color_picker, camera) < 0) {
1101         return -1;
1102     }
1103
1104     return 0;
1105 }
1106
1107 static
1108 int rect_layer_event_recolor(RectLayer *layer,
1109                              const SDL_Event *event,
1110                              const Camera *camera,
1111                              UndoHistory *undo_history)
1112 {
1113     trace_assert(layer);
1114     trace_assert(event);
1115     trace_assert(camera);
1116     trace_assert(undo_history);
1117     trace_assert(layer->selection >= 0);
1118
1119     int color_changed = 0;
1120     if (color_picker_event(&layer->color_picker, event, camera, &color_changed) < 0) {
1121         return -1;
1122     }
1123
1124     if (color_changed) {
1125         layer->inter_color = color_picker_rgba(&layer->color_picker);
1126
1127         if (!color_picker_drag(&layer->color_picker)) {
1128             UNDO_PUSH(undo_history, create_undo_update_context(layer));
1129             dynarray_replace_at(layer->colors, (size_t) layer->selection, &layer->inter_color);
1130             layer->state = RECT_LAYER_IDLE;
1131         }
1132     }
1133
1134     return 0;
1135 }
1136
1137 int rect_layer_event(RectLayer *layer,
1138                      const SDL_Event *event,
1139                      const Camera *camera,
1140                      UndoHistory *undo_history)
1141 {
1142     trace_assert(layer);
1143     trace_assert(event);
1144     trace_assert(undo_history);
1145
1146     switch (event->type) {
1147     case SDL_WINDOWEVENT: {
1148         switch (event->window.event) {
1149         case SDL_WINDOWEVENT_SIZE_CHANGED: {
1150             grid_relayout(layer->grid, rect(0.0f, 0.0f,
1151                                             (float) event->window.data1,
1152                                             (float) event->window.data2));
1153         } break;
1154         }
1155     } break;
1156     }
1157
1158     switch (layer->state) {
1159     case RECT_LAYER_IDLE:
1160         return rect_layer_event_idle(layer, event, camera, undo_history);
1161
1162     case RECT_LAYER_CREATE:
1163         return rect_layer_event_create(layer, event, camera, undo_history);
1164
1165     case RECT_LAYER_RESIZE:
1166         return rect_layer_event_resize(layer, event, camera, undo_history);
1167
1168     case RECT_LAYER_MOVE:
1169         return rect_layer_event_move(layer, event, camera, undo_history);
1170
1171     case RECT_LAYER_ID_RENAME:
1172         return rect_layer_event_id_rename(layer, event, camera, undo_history);
1173
1174     case RECT_LAYER_RECOLOR:
1175         return rect_layer_event_recolor(layer, event, camera, undo_history);
1176     }
1177
1178
1179     return 0;
1180 }
1181
1182 size_t rect_layer_count(const RectLayer *layer)
1183 {
1184     return dynarray_count(layer->rects);
1185 }
1186
1187 const Rect *rect_layer_rects(const RectLayer *layer)
1188 {
1189     return dynarray_data(layer->rects);
1190 }
1191
1192 const Color *rect_layer_colors(const RectLayer *layer)
1193 {
1194     return dynarray_data(layer->colors);
1195 }
1196
1197 const char *rect_layer_ids(const RectLayer *layer)
1198 {
1199     return dynarray_data(layer->ids);
1200 }
1201
1202 int rect_layer_dump_stream(const RectLayer *layer, FILE *filedump)
1203 {
1204     trace_assert(layer);
1205     trace_assert(filedump);
1206
1207     size_t n = dynarray_count(layer->ids);
1208     char *ids = dynarray_data(layer->ids);
1209     Rect *rects = dynarray_data(layer->rects);
1210     Color *colors = dynarray_data(layer->colors);
1211     Action *actions = dynarray_data(layer->actions);
1212
1213     fprintf(filedump, "%zd\n", n);
1214     for (size_t i = 0; i < n; ++i) {
1215         fprintf(filedump, "%s %f %f %f %f ",
1216                 ids + ENTITY_MAX_ID_SIZE * i,
1217                 rects[i].x, rects[i].y, rects[i].w, rects[i].h);
1218         color_hex_to_stream(colors[i], filedump);
1219
1220         switch (actions[i].type) {
1221         case ACTION_NONE: {} break;
1222
1223         case ACTION_TOGGLE_GOAL:
1224         case ACTION_HIDE_LABEL: {
1225             fprintf(filedump, " %d %.*s",
1226                     (int)actions[i].type,
1227                     ENTITY_MAX_ID_SIZE, actions[i].entity_id);
1228         } break;
1229         case ACTION_N: break;
1230         }
1231
1232         fprintf(filedump, "\n");
1233     }
1234
1235     return 0;
1236 }
1237
1238 const Action *rect_layer_actions(const RectLayer *layer)
1239 {
1240     return dynarray_data(layer->actions);
1241 }