hud: backpack animation when picking up items

CMakeLists.txt

@@ -62,6 +62,7 @@ set(ASSETS
   assets-cg/menu_title.png
   # HUD
   assets-cg/hud.png
+  assets-cg/hud_backpack.ase
   assets-cg/hud_delay.png
   assets-cg/hud_flag.png
   assets-cg/hud_itemslots.png

assets-cg/fxconv-metadata.txt

@@ -9,6 +9,12 @@ hud_xp.ase:
   center: 6, 8
   next: Idle=Idle, Shine=Idle, Explode=Idle
 
+hud_backpack.ase:
+  custom-type: aseprite-anim
+  name: frames_hud_backpack
+  center: 0, 0
+  next: Idle=Idle, Open=Idle
+
 font_rogue.png:
   type: font
   name: font_rogue

src/anim.c

@@ -60,6 +60,8 @@ ANIM4(player, Hit);
 ANIM1(hud_xp_Idle);
 ANIM1(hud_xp_Shine);
 ANIM1(hud_xp_Explode);
+ANIM1(hud_backpack_Idle);
+ANIM1(hud_backpack_Open);
 
 /* Items */
 ANIM1(item_life);

src/anim.h

@@ -103,6 +103,8 @@ extern anim_t anims_player_Hit;
 extern anim_t anims_hud_xp_Idle;
 extern anim_t anims_hud_xp_Shine;
 extern anim_t anims_hud_xp_Explode;
+extern anim_t anims_hud_backpack_Idle;
+extern anim_t anims_hud_backpack_Open;
 
 /* Items */
 extern anim_t anims_item_life;

src/aoe.c

@@ -273,8 +273,10 @@ void aoe_apply(game_t *game, entity_t *entity, entity_t *e)
 
     if(aoe->type == AOE_ITEM && e_f && e_f->player) {
         bool picked = player_give_item(e, aoe->data.item.type);
-        if(picked)
+        if(picked) {
+            game_hud_start_backpack_anim(game);
             aoe->lifetime = 0;
+        }
         /* Don't bother recording the hit since the item will disappear */
         was_hit = false;
     }

src/game.c

@@ -43,6 +43,8 @@ bool game_load(game_t *g, level_t const *level)
 
     g->hud_xp_anim.frame = anims_hud_xp_Idle.start[0];
     g->hud_xp_anim.elapsed = 0;
+    g->hud_backpack_anim.frame = anims_hud_backpack_Idle.start[0];
+    g->hud_backpack_anim.elapsed = 0;
 
     g->menu_time = fix(0);
     g->menu_open = false;
@@ -185,6 +187,12 @@ void game_message(game_t *g, fixed_t duration, char const *fmt, ...)
     g->message_time = duration;
 }
 
+void game_hud_start_backpack_anim(game_t *g)
+{
+    g->hud_backpack_anim.frame = anims_hud_backpack_Open.start[0];
+    g->hud_backpack_anim.elapsed = 0;
+}
+
 //---
 // Object management functions
 //---
@@ -430,6 +438,7 @@ void game_update_animations(game_t *g, fixed_t dt)
         g->map_anim[i] += fround(dt * 1000);
 
     anim_state_update(&g->hud_xp_anim, dt);
+    anim_state_update(&g->hud_backpack_anim, dt);
 }
 
 void game_update_effects(game_t *g, fixed_t dt)

src/game.h

@@ -52,6 +52,8 @@ typedef struct game {
 
 	/* XP bar animation */
 	anim_state_t hud_xp_anim;
+	/* Backpack animation */
+	anim_state_t hud_backpack_anim;
 	/* Inventory/status menu opening time (0 is closed, 1 is open) */
 	fixed_t menu_time;
 	/* Whether the menu is open or closed. Dictates whether menu_time goes
@@ -90,6 +92,9 @@ void game_shake(game_t *g, int amplitude, fixed_t duration);
 /* Set the current game message */
 void game_message(game_t *g, fixed_t duration, char const *fmt, ...);
 
+/* Start the backpack animation */
+void game_hud_start_backpack_anim(game_t *g);
+
 //---
 // Managing dynamic game elements
 //---

src/render.c

@@ -527,6 +527,11 @@ static void dtext_multi(int x0, int y, int color, char const *str)
     }
 }
 
+static int skill_x(int i)
+{
+    return 23 + 44*i + 103*(i>=3);
+}
+
 void render_game(game_t const *g, bool show_hitboxes)
 {
     camera_t const *camera = &g->camera;
@@ -627,7 +632,7 @@ void render_game(game_t const *g, bool show_hitboxes)
         fixed_t cooldown_remaining = player_f->actions_cooldown[i+1];
         int skill = player_f->skills[i+1];
 
-        int x = 23 + 44*i + 103*(i>=3);
+        int x = skill_x(i);
         int y = HUD_Y - 33;
         int bg = (cooldown_remaining != 0) ? 2 : 1;
         skill_render(x+2, y+2, skill, bg, C_WHITE);
@@ -648,6 +653,9 @@ void render_game(game_t const *g, bool show_hitboxes)
         }
     }
 
+    /* Render backpack icon */
+    anim_frame_render(skill_x(5)+2, HUD_Y-33+2, g->hud_backpack_anim.frame);
+
     if(g->menu_time > 0) {
         int x1 = cubic(-130, 0, g->menu_time, fix(1));
         int x2 = DWIDTH - 130 - x1;
@@ -745,7 +753,7 @@ void render_game(game_t const *g, bool show_hitboxes)
         for(int i = 0; i < 5; i++) {
             int s1 = player_f->skills[i+1], s2 = switched_skills[i+1];
             if(s1 == s2) continue;
-            int x = 23 + 44*i + 103*(i>=3);
+            int x = skill_x(i);
             int y = HUD_Y - 33;
             skill_render(x+2, y+2, s2, 3, C_WHITE);
         }