src/game/level/level_editor/layer_picker.c

   1 #include <stdbool.h>
   2 #include <string.h>
   3
   4 #include <SDL.h>
   5
   6 #include "system/stacktrace.h"
   7 #include "layer_picker.h"
   8 #include "color.h"
   9 #include "game/camera.h"
  10 #include "math/rect.h"
  11 #include "math/extrema.h"
  12 #include "game/sprite_font.h"
  13
  14 #define LAYER_TITLE_PADDING 15.0f
  15 #define LAYER_TITLE_SIZE 3.0f
  16 #define LAYER_SELECTED_OFFSET 15.0f
  17
  18 static const Color LAYER_CELL_BACKGROUND_COLORS[LAYER_PICKER_N] = {
  19     {1.0f, 0.0f, 0.0f, 1.0f},
  20     {0.0f, 1.0f, 0.0f, 1.0f},
  21     {0.0f, 0.0f, 1.0f, 1.0f},
  22     {1.0f, 1.0f, 1.0f, 1.0f},
  23     {1.0f, 0.2f, 0.6f, 1.0f},
  24     {0.6f, 0.6f, 1.0f, 1.0f},
  25     {0.2f, 1.0f, 0.6f, 1.0f},
  26     {0.2f, 0.6f, 1.0f, 1.0f},
  27     {0.2f, 1.0f, 0.6f, 1.0f},
  28 };
  29
  30 static const char *LAYER_CELL_TITLES[LAYER_PICKER_N] = {
  31     "Background",              // LAYER_PICKER_BACKGROUND
  32     "Player",                  // LAYER_PICKER_PLAYER
  33     "Platforms",               // LAYER_PICKER_PLATFORMS,
  34     "Goals",                   // LAYER_PICKER_GOALS
  35     "Lava",                    // LAYER_PICKER_LAVA
  36     "Back Platforms",          // LAYER_PICKER_BACK_PLATFORMS,
  37     "Boxes",                   // LAYER_PICKER_BOXES = 0,
  38     "Labels",                  // LAYER_PICKER_LABELS
  39     "Regions",                 // LAYER_PICKER_REGIONS
  40 };
  41
  42 inline static float layer_picker_max_width(void)
  43 {
  44     size_t max = 0;
  45
  46     for (size_t i = 0; i < LAYER_PICKER_N; ++i) {
  47         max = max_size_t(max, strlen(LAYER_CELL_TITLES[i]));
  48     }
  49
  50     return (float) max * FONT_CHAR_WIDTH * LAYER_TITLE_SIZE + LAYER_TITLE_PADDING * 2.0f;
  51 }
  52
  53 #define LAYER_CELL_WIDTH layer_picker_max_width()
  54 #define LAYER_CELL_HEIGHT (LAYER_TITLE_SIZE * FONT_CHAR_HEIGHT + LAYER_TITLE_PADDING * 2.0f)
  55
  56 inline static Vec layer_picker_position(const Camera *camera)
  57 {
  58     trace_assert(camera);
  59
  60     const Rect viewport = camera_view_port_screen(camera);
  61
  62     Vec position = {
  63         .x = 0.0f,
  64         .y = viewport.h * 0.5f - LAYER_CELL_HEIGHT * LAYER_PICKER_N * 0.5f
  65     };
  66
  67     return position;
  68 }
  69
  70 int layer_picker_render(const LayerPicker *layer_picker,
  71                         Camera *camera)
  72 {
  73     trace_assert(layer_picker);
  74     trace_assert(camera);
  75
  76     for (size_t i = 0; i < LAYER_PICKER_N; ++i) {
  77         Vec position = layer_picker_position(camera);
  78         Color color = LAYER_CELL_BACKGROUND_COLORS[i];
  79
  80         if (*layer_picker == i) {
  81             position.x += LAYER_SELECTED_OFFSET;
  82         } else {
  83             color.a *= 0.70f;
  84         }
  85
  86         if (camera_fill_rect_screen(
  87                 camera,
  88                 rect(
  89                     position.x,
  90                     LAYER_CELL_HEIGHT * (float) i + position.y,
  91                     LAYER_CELL_WIDTH,
  92                     LAYER_CELL_HEIGHT),
  93                 color) < 0) {
  94             return -1;
  95         }
  96
  97         if (camera_render_text_screen(
  98                 camera,
  99                 LAYER_CELL_TITLES[i],
 100                 vec(LAYER_TITLE_SIZE, LAYER_TITLE_SIZE),
 101                 color_invert(color),
 102                 vec(position.x + LAYER_TITLE_PADDING,
 103                     LAYER_CELL_HEIGHT * (float) i + position.y + LAYER_TITLE_PADDING)) < 0) {
 104             return -1;
 105         }
 106     }
 107
 108     return 0;
 109 }
 110
 111 int layer_picker_event(LayerPicker *layer_picker,
 112                        const SDL_Event *event,
 113                        const Camera *camera,
 114                        bool *selected)
 115 {
 116     trace_assert(layer_picker);
 117     trace_assert(event);
 118     trace_assert(camera);
 119
 120     const Vec position = layer_picker_position(camera);
 121
 122     switch (event->type) {
 123     case SDL_MOUSEBUTTONDOWN: {
 124         for (size_t i = 0; i < LAYER_PICKER_N; ++i) {
 125             const Rect cell = rect(position.x,
 126                                    LAYER_CELL_HEIGHT * (float) i + position.y,
 127                                    LAYER_CELL_WIDTH,
 128                                    LAYER_CELL_HEIGHT);
 129             if (rect_contains_point(cell, vec((float) event->button.x, (float) event->button.y))) {
 130                 *layer_picker = i;
 131                 *selected = true;
 132                 return 0;
 133             }
 134         }
 135     } break;
 136     }
 137
 138     return 0;
 139 }