Juice: pitch variation, squash, dust, trails, jiggle, breathing, hit-stop, numbers, stage-up, digest and rare flair

MODDING.md

@@ -150,6 +150,8 @@ The areas which will expand based on how full the character is and their progres
 | `null` | The null that will expand. |
 | `scaleMax` | The scale (in percent) that will be added at maximum. Know that a scale of 100 is the normal scale of an animation. |
 
+The first expand area is treated as the belly: it breathes, jiggles when smacked, rubbed or fed, and is where digestion and stage-up effects come from.
+
 ### interactTypes, interactAreas
 `interactTypes` is an object of interaction types by name, giving each type's defaults. Rub, Smack, Kiss and Turn Around come from common. A type gets a button on the taskbar only if one of the character's areas uses it. `interactAreas` is a list of the concrete areas on a character which can be interacted with; usually for belly rubs, kisses, etc. Each area names its `type` and takes all of that type's settings, changing whichever it gives itself.
 
@@ -199,7 +201,7 @@ The UI's sounds.
 | `sounds` | `open` and `close` (the taskbar or one of its windows), `hover` and `select` (a widget), and `cheats` (after entering a special code to activate cheats). |
 
 ### particles
-An object of particles by name, each with the `anm2` and `animation` it plays once where spawned.
+An object of particles by name, each with the `anm2` and `animation` it plays once where spawned. The `Puff` particle is also used for the dust when an item lands hard.
 
 # items.json
 

src/audio.cpp

@@ -2,6 +2,8 @@
 #include <SDL3/SDL.h>
 #include <stb_vorbis.c>
 
+constexpr float PITCH_VARIATION = 0.06f;
+
 void Audio::init()
 {
     if (SDL_InitSubSystem(SDL_INIT_AUDIO))
@@ -88,6 +90,7 @@ void Audio::play(Sound* sound)
     SDL_AudioSpec spec = {SDL_AUDIO_S16, sound->channels, sound->rate};
     SDL_ClearAudioStream(voices[voice]);
     SDL_SetAudioStreamFormat(voices[voice], &spec, nullptr);
+    SDL_SetAudioStreamFrequencyRatio(voices[voice], random_get(1 - PITCH_VARIATION, 1 + PITCH_VARIATION));
     SDL_PutAudioStreamData(voices[voice], sound->samples, sound->frames * sound->channels * (int)sizeof(short));
 }
 

src/body.cpp

@@ -1,5 +1,9 @@
 #include "play.h"
 
+constexpr float BREATH_AMPLITUDE = 1.5f;
+constexpr float BREATH_SPEED = 2.2f;
+constexpr float JIGGLE_DAMPING = 0.12f;
+constexpr float JIGGLE_STIFFNESS = 0.18f;
 constexpr float SWAP_STEP = 0.5f;
 
 enum SwapMode
@@ -58,6 +62,20 @@ float Body::capacity_percent_get()
     return capacityMax > 0 ? stats.calories / capacityMax : 0;
 }
 
+// Pushes the belly's spring, harder the bigger the body has grown.
+void Body::jiggle_add(float amount)
+{
+    jiggleVelocity += amount * (1 + (float)stage / std::max(1, (int)character->stages.size()));
+}
+
+// Where the belly is (its expand area's null), or else the middle of the body.
+Vec2 Body::belly_get()
+{
+    std::vector<ExpandArea>& areas = character->expandAreas;
+    Rect rect = areas.empty() ? Rect{} : actor.null_rect_get(areas[0].null);
+    return rect_middle(is_rect_valid(rect) ? rect : actor.bounds_get());
+}
+
 bool Body::is_over_capacity()
 {
     return stats.calories > stats.capacity;
@@ -184,6 +202,9 @@ void Body::update(std::vector<Event>& events)
         if (!isTalking)
             idle_play();
     }
+    if (freeze > 0)
+        freeze--;
+    else
         actor.update(*audio);
 
     if (stats.isDigesting && --stats.digestionTimer <= 0)
@@ -205,9 +226,12 @@ void Body::update(std::vector<Event>& events)
             stage_set(nextStage);
             isStageUp = true;
             actor.isLocked = true;
+            events.push_back(EVENT_STAGE_START);
         }
         else
             events.push_back(EVENT_DIGESTED);
+        gained = nextWeight - stats.weight;
+        events.push_back(EVENT_GAINED);
         stats.weight = nextWeight;
         stats.isDigesting = false;
         stats.digestionTimer = traits.digestionTime;
@@ -222,6 +246,7 @@ void Body::update(std::vector<Event>& events)
             stats.isDigesting = true;
             stats.digestionTimer = traits.digestionTime;
             audio->play(character->sounds[SOUND_DIGEST]);
+            events.push_back(EVENT_DIGEST_START);
         }
     }
     values_clamp();
@@ -234,13 +259,21 @@ void Body::update(std::vector<Event>& events)
     float capacityProgress = capacity_percent_get();
     if (stats.isDigesting)
         capacityProgress *= (float)stats.digestionTimer / std::max(1, traits.digestionTime);
-    for (ExpandArea& expandArea : character->expandAreas)
+    jiggleVelocity += -jiggle * JIGGLE_STIFFNESS - jiggleVelocity * JIGGLE_DAMPING;
+    jiggle += jiggleVelocity;
+    float growth = 1 + (float)stage / std::max(1, (int)character->stages.size());
+    float breath = std::sin(stats.playtime * BREATH_SPEED) * BREATH_AMPLITUDE * growth;
+    for (int i = 0; i < (int)character->expandAreas.size(); i++)
     {
+        ExpandArea& expandArea = character->expandAreas[i];
         float add = std::clamp((stageProgress + capacityProgress) * expandArea.scaleMax / 2, 0.0f, expandArea.scaleMax);
+        Vec2 scale = {add, add};
+        if (i == 0)
+            scale = scale + Vec2{jiggle, breath - jiggle};
         if (expandArea.layer >= 0)
-            actor.layers[expandArea.layer].scale = {add, add};
+            actor.layers[expandArea.layer].scale = scale;
         if (expandArea.null >= 0)
-            actor.nullScales[expandArea.null] = {add, add};
+            actor.nullScales[expandArea.null] = scale;
     }
 
     isTalking = is_swapping(actor, character->talk, talkTime, isTalking, SWAP_LOOP);

src/effects.cpp

@@ -0,0 +1,50 @@
+#include "effects.h"
+
+constexpr float FLASH_FADE = 0.04f;
+constexpr float FLOATER_RISE = 0.8f;
+constexpr float SPARK_DRAG = 0.95f;
+constexpr float SPEED_MIN = 0.4f;
+
+void Effects::update()
+{
+    for (int i = 0; i < (int)floaters.size(); i++)
+    {
+        floaters[i].position.y -= FLOATER_RISE;
+        if (--floaters[i].life <= 0)
+            floaters.erase(floaters.begin() + i--);
+    }
+    for (int i = 0; i < (int)sparks.size(); i++)
+    {
+        Spark& spark = sparks[i];
+        spark.velocity = spark.velocity * SPARK_DRAG;
+        spark.velocity.y += spark.gravity;
+        spark.position = spark.position + spark.velocity;
+        if (--spark.life <= 0)
+            sparks.erase(sparks.begin() + i--);
+    }
+    flash = std::max(0.0f, flash - FLASH_FADE);
+}
+
+void Effects::floater_add(Vec2 position, float value, FloaterType type)
+{
+    floaters.push_back({position, value, FLOATER_LIFE, type});
+}
+
+void Effects::spark_add(Spark spark)
+{
+    spark.lifeMax = spark.life;
+    sparks.push_back(spark);
+}
+
+// Throws count copies of a spark out in every direction, at up to speed.
+void Effects::burst_add(Spark spark, int count, float speed)
+{
+    for (int i = 0; i < count; i++)
+    {
+        float angle = random_get(0, 2 * PI);
+        float magnitude = random_get(speed * SPEED_MIN, speed);
+        Spark each = spark;
+        each.velocity = Vec2{std::cos(angle), std::sin(angle)} * magnitude + spark.velocity;
+        spark_add(each);
+    }
+}

src/effects.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "common.h"
+#include <vector>
+
+constexpr int FLOATER_LIFE = 75;
+
+enum FloaterType
+{
+    FLOATER_CALORIES,
+    FLOATER_WEIGHT
+};
+
+enum SparkShape
+{
+    SPARK_CIRCLE,
+    SPARK_STAR
+};
+
+// A number rising from where something happened, fading as it goes.
+struct Floater
+{
+    Vec2 position;
+    float value = 0;
+    int life = 0;
+    FloaterType type = FLOATER_CALORIES;
+};
+
+// A glint or puff that drifts, falls (or rises) by its gravity, and fades over its life.
+struct Spark
+{
+    Color color;
+    Vec2 position;
+    Vec2 velocity;
+    float gravity = 0;
+    float size = 0;
+    int life = 0;
+    int lifeMax = 0;
+    SparkShape shape = SPARK_CIRCLE;
+};
+
+// Short flourishes over the world: rising numbers, sparks, and the screen flashing.
+class Effects
+{
+public:
+    std::vector<Floater> floaters;
+    std::vector<Spark> sparks;
+    float flash = 0;
+
+    void update();
+    void floater_add(Vec2 position, float value, FloaterType type);
+    void spark_add(Spark spark);
+    void burst_add(Spark spark, int count, float speed);
+};

src/interact.cpp

@@ -1,6 +1,9 @@
 #include "play.h"
 
 constexpr const char* FULL_SUFFIX = "Full";
+constexpr float RUB_JIGGLE = 0.3f;
+constexpr float SMACK_JIGGLE = 6;
+constexpr int HIT_STOP = 3;
 
 constexpr float AUTO_ACCELERATION = 0.45f;
 constexpr float AUTO_ANGLE_STEP = 0.08f;
@@ -63,6 +66,11 @@ void Interactions::update(Play& play, Pointer pointer)
                 if (entry.digestionClick > 0 && body.stats.calories > 0 && !body.stats.isDigesting)
                     body.stats.digestionProgress += entry.digestionClick;
                 body.actor.pulse_add(entry.layer, entry.scaleAmplitude, entry.scaleCycles, entry.scaleTime);
+                if (entry.scaleAmplitude > 0)
+                {
+                    body.jiggle_add(SMACK_JIGGLE);
+                    body.freeze = HIT_STOP;
+                }
                 bool isReady = cooldowns[i] <= 0;
                 cooldowns[i] = std::max(0, entry.dialogueCooldown);
                 Dialogue& dialogue = character.dialogue;
@@ -82,8 +90,10 @@ void Interactions::update(Play& play, Pointer pointer)
                 play.cursorState = CURSOR_ACTION;
                 active.play(entry.cursorActive);
                 Vec2 moved = pointer.position - pointerPrevious;
-                if (entry.digestionHover > 0 && body.stats.calories > 0 && !body.stats.isDigesting &&
-                    (moved.x != 0 || moved.y != 0))
+                bool isMoved = moved.x != 0 || moved.y != 0;
+                if (entry.digestionHover > 0 && isMoved)
+                    body.jiggle_add(RUB_JIGGLE);
+                if (entry.digestionHover > 0 && body.stats.calories > 0 && !body.stats.isDigesting && isMoved)
                     body.stats.digestionProgress += entry.digestionHover;
             }
         }

src/items.cpp

@@ -8,7 +8,26 @@ constexpr float CRUMB_SPEED_X = 4;
 constexpr float CRUMB_SPEED_Y_MAX = 7;
 constexpr float CRUMB_SPEED_Y_MIN = 2;
 constexpr float CRUMB_SPIN = 15;
+constexpr Color GOLD = {1, 0.85f, 0.3f, 1};
+constexpr Color TRAIL_COLOR = {1, 1, 1, 0.35f};
+constexpr const char* DUST_PARTICLE = "Puff";
+constexpr float BITE_JIGGLE = 4;
+constexpr float DUST_IMPACT = 12;
+constexpr float FANFARE_MIN = 0.75f;
+constexpr float FANFARE_SHAKE = 0.015f;
+constexpr float FANFARE_SPEED = 5;
 constexpr float HOLD_SPIN = 0.1f;
+constexpr float RARE_SPARKLE_CHANCE = 12;
+constexpr float RARE_SPARKLE_RISE = -0.5f;
+constexpr float SQUASH_DECAY = 0.82f;
+constexpr float SQUASH_MAX = 0.35f;
+constexpr float SQUASH_PER_SPEED = 0.025f;
+constexpr float TRAIL_SPEED = 12;
+constexpr Spark FANFARE_SPARK = {GOLD, {}, {}, 0.05f, 16, 50, 0, SPARK_STAR};
+constexpr Spark RARE_SPARK = {GOLD, {}, {}, 0, 10, 40, 0, SPARK_STAR};
+constexpr Spark TRAIL_SPARK = {TRAIL_COLOR, {}, {}, 0, 7, 14, 0, SPARK_CIRCLE};
+constexpr int FANFARE_COUNT = 20;
+constexpr int FANFARE_SHAKE_TIME = 12;
 constexpr int CRUMB_COUNT = 6;
 constexpr float ROTATION_GROUND_DAMPING = 0.85f;
 constexpr float ROTATION_MAX = 90;
@@ -17,7 +36,7 @@ constexpr float THROW_THRESHOLD = 10;
 
 void Items::add(Play& play, int id, Vec2 position, Vec2 velocity, float rotation)
 {
-    ItemEntity& entity = list.emplace_back(ItemEntity{play.character->item_actor_get(id), velocity, 0, id});
+    ItemEntity& entity = list.emplace_back(ItemEntity{play.character->item_actor_get(id), {}, velocity, 0, id});
     entity.actor.position = position;
     entity.actor.rotation = rotation;
     discovered[id] = true;
@@ -46,8 +65,17 @@ void Items::crumbs_spawn(ItemEntity& source)
     }
 }
 
-// Moves an item or crumb a tick under gravity, bouncing off the bounds and settling on the ground. True if it bounced.
-static bool motion_update(Play& play, ItemEntity& entity)
+// How special an item's rarity is, from 0 (the first, or none) to 1 (the last).
+static float rarity_intensity_get(Play& play, int id)
+{
+    int rarity = play.character->catalog.items[id].rarity;
+    int count = (int)play.character->catalog.rarities.size();
+    return rarity > 0 && count > 1 ? (float)rarity / (count - 1) : 0;
+}
+
+// Moves an item or crumb a tick under gravity, bouncing off the bounds and settling on the ground. Gives the speed it
+// hit something at (0 if it didn't), and squashes it by that.
+static float motion_update(Play& play, ItemEntity& entity)
 {
     Area& area = play.character->area;
     Rect bounds = play.bounds;
@@ -58,16 +86,17 @@ static bool motion_update(Play& play, ItemEntity& entity)
     gravity = gravity != 0 ? gravity : area.gravity;
     float right = bounds.x + bounds.w;
     float bottom = bounds.y + bounds.h;
-    bool isBounced = false;
+    float impact = 0;
     position = position + velocity;
     rotation += entity.angularVelocity;
     if (position.x <= bounds.x || position.x >= right)
     {
         position.x = position.x <= bounds.x ? bounds.x + 1 : right - 1;
+        impact = std::abs(velocity.x);
+        entity.squash = Vec2{-1, 1} * std::min(SQUASH_MAX, impact * SQUASH_PER_SPEED);
         velocity.x = -velocity.x * area.friction;
         entity.angularVelocity = -entity.angularVelocity * area.friction;
         rotation = -rotation;
-        isBounced = true;
     }
     if (position.y <= bounds.y || position.y >= bottom)
     {
@@ -82,16 +111,17 @@ static bool motion_update(Play& play, ItemEntity& entity)
         }
         else
         {
+            impact = std::abs(velocity.y);
+            entity.squash = Vec2{1, -1} * std::min(SQUASH_MAX, impact * SQUASH_PER_SPEED);
             velocity.y = -velocity.y;
             entity.angularVelocity *= area.friction;
-            isBounced = true;
         }
         velocity.y *= area.friction;
     }
     velocity.x *= area.airResistance;
     velocity.y += gravity;
     position = {std::clamp(position.x, bounds.x, right), std::clamp(position.y, bounds.y, bottom)};
-    return isBounced;
+    return impact;
 }
 
 // Forgets which item is being eaten, and lets go of the held one unless asked to keep it.
@@ -209,6 +239,13 @@ void Items::update(Play& play, Pointer pointer)
             audio.play(character.sounds[SOUND_NEW_ITEM]);
         }
         add(play, id, position);
+        if (rarity_intensity_get(play, id) >= FANFARE_MIN)
+        {
+            Spark spark = FANFARE_SPARK;
+            spark.position = position;
+            play.effects.burst_add(spark, FANFARE_COUNT, FANFARE_SPEED);
+            play.camera.shake_add(FANFARE_SHAKE, FANFARE_SHAKE_TIME);
+        }
         stats.totalSpawned++;
         play.particles_spawn(character.catalog.summonParticles, position);
     }
@@ -256,6 +293,8 @@ void Items::update(Play& play, Pointer pointer)
                                                          traits.digestionRateMin, traits.digestionRateMax);
                         stats.totalConsumed++;
                         crumbs_spawn(entity);
+                        play.effects.floater_add(entity.actor.position, item.calories, FLOATER_CALORIES);
+                        body.jiggle_add(BITE_JIGGLE);
                         removed = held;
                         drop();
                         feeding.animation = body.actor.animation;
@@ -297,6 +336,7 @@ void Items::update(Play& play, Pointer pointer)
             if (isThrown)
                 text_play(HOOK_THROW);
             entity.velocity = entity.velocity - delta;
+            entity.isThrown = isThrown;
             release(isThrown);
         }
         if (removed >= 0)
@@ -347,8 +387,32 @@ void Items::update(Play& play, Pointer pointer)
             position = {std::clamp(position.x, bounds.x, bounds.x + bounds.w),
                         std::clamp(position.y, bounds.y, bounds.y + bounds.h)};
         }
-        else if (motion_update(play, entity))
+        else
+        {
+            float impact = motion_update(play, entity);
+            if (impact > 0)
                 audio.play(character.sounds[SOUND_BOUNCE]);
+            if (impact >= DUST_IMPACT)
+                play.particles_spawn({DUST_PARTICLE}, position);
+            entity.isThrown &= vec2_length(entity.velocity) >= TRAIL_SPEED;
+            if (entity.isThrown)
+            {
+                Spark spark = TRAIL_SPARK;
+                spark.position = position;
+                play.effects.spark_add(spark);
+            }
+        }
+        entity.squash = entity.squash * SQUASH_DECAY;
+        for (LayerChange& layer : entity.actor.layers)
+            layer.scale = entity.squash * PERCENT;
+        if (i != held && is_chance(rarity_intensity_get(play, entity.id) * RARE_SPARKLE_CHANCE))
+        {
+            Rect rect = entity.actor.bounds_get();
+            Spark spark = RARE_SPARK;
+            spark.position = {rect.x + random_get(0, rect.w), rect.y + random_get(0, rect.h)};
+            spark.velocity = {0, RARE_SPARKLE_RISE};
+            play.effects.spark_add(spark);
+        }
     }
 
     for (int i = 0; i < (int)crumbs.size(); i++)

src/play.cpp

@@ -11,7 +11,24 @@ constexpr ImGuiKey CHEAT_KEYS[] = {ImGuiKey_UpArrow,    ImGuiKey_DownArrow, ImGu
                                    ImGuiKey_RightArrow, ImGuiKey_B,         ImGuiKey_A};
 constexpr const char* KEY_DISCOVERED = "discovered";
 constexpr const char* KEY_ITEM = "item";
+constexpr Spark DIGEST_SPARK = {{1, 1, 1, 0.5f}, {}, {}, -0.06f, 10, 50, 0, SPARK_CIRCLE};
+constexpr Spark STAGE_SPARK = {{1, 0.85f, 0.3f, 1}, {}, {}, 0.06f, 18, 70, 0, SPARK_STAR};
 constexpr float AUTOSAVE_TIME = 30;
+constexpr float DIGEST_JIGGLE = 3;
+constexpr float DIGEST_SHAKE = 0.006f;
+constexpr float DIGEST_SPEED = 2;
+constexpr float PUNCH_DECAY = 0.93f;
+constexpr float PUNCH_EPSILON = 0.001f;
+constexpr float STAGE_FLASH = 0.7f;
+constexpr float STAGE_JIGGLE = 15;
+constexpr float STAGE_PUNCH = 0.08f;
+constexpr float STAGE_SHAKE = 0.04f;
+constexpr float STAGE_SPEED = 8;
+constexpr int DIGEST_COUNT = 10;
+constexpr int DIGEST_SHAKE_TIME = 40;
+constexpr int STAGE_COUNT = 28;
+constexpr int STAGE_FREEZE = 5;
+constexpr int STAGE_SHAKE_TIME = 30;
 constexpr float CHEAT_TIME = 5;
 constexpr float FOCUS_PADDING = 100;
 constexpr float SHAKE_DECAY = 0.97f;
@@ -176,6 +193,25 @@ void Play::events_handle(Vec2 screenSize)
     Dialogue& dialogue = character->dialogue;
     for (Event event : events)
     {
+        Spark spark = event == EVENT_STAGE_START ? STAGE_SPARK : DIGEST_SPARK;
+        spark.position = body.belly_get();
+        if (event == EVENT_GAINED && body.gained > 0)
+            effects.floater_add(spark.position, body.gained, FLOATER_WEIGHT);
+        if (event == EVENT_DIGEST_START)
+        {
+            effects.burst_add(spark, DIGEST_COUNT, DIGEST_SPEED);
+            camera.shake_add(DIGEST_SHAKE, DIGEST_SHAKE_TIME);
+            body.jiggle_add(DIGEST_JIGGLE);
+        }
+        if (event == EVENT_STAGE_START)
+        {
+            effects.burst_add(spark, STAGE_COUNT, STAGE_SPEED);
+            effects.flash = STAGE_FLASH;
+            camera.shake_add(STAGE_SHAKE, STAGE_SHAKE_TIME);
+            camera.punch = STAGE_PUNCH;
+            body.jiggle_add(STAGE_JIGGLE);
+            body.freeze = STAGE_FREEZE;
+        }
         if (event == EVENT_DIGESTED && !text.isScene && text.is_interruptible())
             text.set(*this, dialogue.hook_get(HOOK_DIGEST));
         if (event == EVENT_STAGE_UP && !text.isScene)
@@ -240,6 +276,7 @@ void Play::update(Vec2 screenSize)
     area_set();
     area.update(*audio);
 
+    effects.update();
     for (int i = 0; i < (int)particles.size(); i++)
     {
         particles[i].update(*audio);
@@ -290,10 +327,14 @@ Vec2 Camera::world_get(Vec2 screen)
     return pan + screen / (zoom / PERCENT);
 }
 
+// The world's transform to the screen, zoomed further about the screen's middle by the punch.
 Affine Camera::view_get(Vec2 screenSize)
 {
     float scale = zoom / PERCENT;
-    return {scale, 0, 0, scale, -pan.x * scale + shake.x * screenSize.x, -pan.y * scale + shake.y * screenSize.y};
+    Vec2 offset = Vec2{-pan.x * scale + shake.x * screenSize.x, -pan.y * scale + shake.y * screenSize.y} * (1 + punch) -
+                  screenSize / 2 * punch;
+    scale *= 1 + punch;
+    return {scale, 0, 0, scale, offset.x, offset.y};
 }
 
 void Camera::shake_add(float magnitude, int time)
@@ -344,6 +385,9 @@ void Camera::update(Play& play, Vec2 screenSize)
     if (ImGui::IsKeyPressed(ImGuiKey_Home))
         play.focus(screenSize);
 
+    punch = punch * PUNCH_DECAY;
+    if (punch < PUNCH_EPSILON)
+        punch = 0;
     if (shakeTime > 0)
     {
         shakeTime--;

src/play.h

@@ -2,6 +2,7 @@
 
 #include "character.h"
 #include "dialogue.h"
+#include "effects.h"
 #include "save.h"
 
 constexpr float DIGESTION_MAX = 100;
@@ -31,7 +32,10 @@ enum Hold
 // What happened to the body in a tick, answered once it's done.
 enum Event
 {
+    EVENT_DIGEST_START,
     EVENT_DIGESTED,
+    EVENT_GAINED,
+    EVENT_STAGE_START,
     EVENT_STAGE_UP,
     EVENT_STAGE_FINAL
 };
@@ -50,14 +54,17 @@ struct Pointer
     bool isRightClicked = false;
 };
 
-// An item in the world, or a crumb of one (which has a life, in ticks).
+// An item in the world, or a crumb of one (which has a life, in ticks). Squash is the added scale of its last impact,
+// and a thrown item trails until it slows down.
 struct ItemEntity
 {
     Actor actor;
+    Vec2 squash;
     Vec2 velocity;
     float angularVelocity = 0;
     int id = 0;
     int life = 0;
+    bool isThrown = false;
 };
 
 struct Toast
@@ -68,7 +75,8 @@ struct Toast
 
 class Play;
 
-// The character's body: its stats, digestion and stages, and the animations they choose.
+// The character's body: its stats, digestion and stages, and the animations they choose. The belly (the first expand
+// area) breathes and jiggles on a spring, and freeze holds the body still for a hit's few ticks.
 class Body
 {
 public:
@@ -79,7 +87,11 @@ public:
     Character* character = nullptr;
     Audio* audio = nullptr;
     float blinkTime = 0;
+    float gained = 0;
+    float jiggle = 0;
+    float jiggleVelocity = 0;
     float talkTime = 0;
+    int freeze = 0;
     int stage = 0;
     bool isBlinking = false;
     bool isStageUp = false;
@@ -93,7 +105,9 @@ public:
     void idle_override_set(const std::string& animation);
     void stage_set(int index);
     void values_clamp();
+    void jiggle_add(float amount);
     std::string idle_get();
+    Vec2 belly_get();
     Rect eat_rect_get(const EatArea& eatArea);
     float capacity_max_get();
     float capacity_percent_get();
@@ -180,6 +194,7 @@ class Camera
 public:
     Vec2 pan;
     Vec2 shake;
+    float punch = 0;
     float zoom = ZOOM_LADDER[0];
     int shakeTime = 0;
     int shakeTimeMax = 0;
@@ -202,6 +217,7 @@ public:
     Autofeed autofeed;
     Body body;
     Camera camera;
+    Effects effects;
     Interactions interactions;
     Items items;
     Text text;

src/ui.cpp

@@ -25,6 +25,14 @@ constexpr float INDICATOR_SIZE = 0.35f;
 constexpr float INDICATOR_SPEED = 2;
 constexpr float ITEM_SIZE = 96;
 constexpr float ROUNDING = 10;
+constexpr ImVec4 CALORIES_COLOR = {1, 0.85f, 0.3f, 1};
+constexpr float BAR_EASE = 6;
+constexpr float BAR_SHAKE = 2;
+constexpr float BAR_SHAKE_SPEED = 40;
+constexpr float FLOATER_OUTLINE = 2;
+constexpr float OVERSTUFFED_PULSE = 0.35f;
+constexpr float OVERSTUFFED_SPEED = 6;
+constexpr float STAR_WAIST = 0.3f;
 constexpr float BAR_WIDTH_MIN = 120;
 constexpr float BUTTON_SIZE_MAX = 96;
 constexpr float BUTTON_SIZE_MIN = 56;
@@ -558,9 +566,16 @@ void Ui::taskbar_draw(Play& play, ImVec2 screen)
         ImGui::AlignTextToFramePadding();
         ImGui::TextUnformatted(labels[i]);
         ImGui::SameLine();
+        float time = (float)ImGui::GetTime();
+        barFills[i] += (fills[i] - barFills[i]) * std::min(1.0f, BAR_EASE * ImGui::GetIO().DeltaTime);
         if (i == 1 && overstuffed > 0)
-            ImGui::PushStyleColor(ImGuiCol_PlotHistogram, ImVec4(1, 1 - overstuffed, 1 - overstuffed, 1));
-        ImGui::ProgressBar(fills[i], {widths[i], 0}, bars[i].c_str());
+        {
+            float red = 1 - overstuffed * (1 - OVERSTUFFED_PULSE * (1 + std::sin(time * OVERSTUFFED_SPEED)) / 2);
+            ImGui::PushStyleColor(ImGuiCol_PlotHistogram, ImVec4(1, red, red, 1));
+            ImVec2 cursor = ImGui::GetCursorScreenPos();
+            ImGui::SetCursorScreenPos({cursor.x + std::sin(time * BAR_SHAKE_SPEED) * BAR_SHAKE * overstuffed, cursor.y});
+        }
+        ImGui::ProgressBar(barFills[i], {widths[i], 0}, bars[i].c_str());
         if (i == 1 && overstuffed > 0)
             ImGui::PopStyleColor();
         if (i == 0 && ImGui::BeginItemTooltip())
@@ -709,6 +724,54 @@ void Ui::text_draw(Play& play, ImVec2 screen)
     ImGui::PopFont();
 }
 
+// The flourishes over the world: sparks, rising numbers (outlined so they read on anything), and the screen's flash.
+void Ui::effects_draw(Play& play, ImVec2 screen)
+{
+    Effects& effects = play.effects;
+    Affine view = play.camera.view_get({screen.x, screen.y});
+    ImDrawList* drawList = ImGui::GetBackgroundDrawList();
+    for (Spark& spark : effects.sparks)
+    {
+        Vec2 at = view * spark.position;
+        float fade = (float)spark.life / std::max(1, spark.lifeMax);
+        float size = spark.size * view.a * fade;
+        ImU32 color = ImGui::GetColorU32(ImVec4(spark.color.r, spark.color.g, spark.color.b, spark.color.a * fade));
+        if (spark.shape == SPARK_CIRCLE)
+        {
+            drawList->AddCircleFilled({at.x, at.y}, size, color);
+            continue;
+        }
+        float waist = size * STAR_WAIST;
+        drawList->AddQuadFilled({at.x, at.y - size}, {at.x + waist, at.y}, {at.x, at.y + size}, {at.x - waist, at.y},
+                                color);
+        drawList->AddQuadFilled({at.x - size, at.y}, {at.x, at.y - waist}, {at.x + size, at.y}, {at.x, at.y + waist},
+                                color);
+    }
+
+    ImFont* font = ImGui::GetFont();
+    for (Floater& floater : effects.floaters)
+    {
+        std::string text = floater.type == FLOATER_CALORIES ? text_format("+%.0f kcal", floater.value)
+                                                            : "+" + weight_format(floater.value, *measurement);
+        float alpha = std::min(1.0f, (float)floater.life / (FLOATER_LIFE / 2));
+        ImVec4 color = floater.type == FLOATER_CALORIES ? CALORIES_COLOR : ImGui::GetStyleColorVec4(ImGuiCol_PlotHistogram);
+        color.w = alpha;
+        ImVec2 size = font->CalcTextSizeA(FONT_HEADER_2, FLT_MAX, 0, text.c_str());
+        Vec2 at = view * floater.position;
+        ImVec2 position = {at.x - size.x / 2, at.y - size.y / 2};
+        ImU32 outline = ImGui::GetColorU32(ImVec4(0, 0, 0, alpha));
+        for (int x = -1; x <= 1; x++)
+            for (int y = -1; y <= 1; y++)
+                if (x != 0 || y != 0)
+                    drawList->AddText(font, FONT_HEADER_2,
+                                      {position.x + x * FLOATER_OUTLINE, position.y + y * FLOATER_OUTLINE}, outline,
+                                      text.c_str());
+        drawList->AddText(font, FONT_HEADER_2, position, ImGui::GetColorU32(color), text.c_str());
+    }
+    if (effects.flash > 0)
+        drawList->AddRectFilled({0, 0}, screen, ImGui::GetColorU32(ImVec4(1, 1, 1, effects.flash)));
+}
+
 // Fading messages stacked down from the top right, newest first.
 void Ui::toasts_draw(Play& play)
 {
@@ -994,6 +1057,7 @@ void Ui::play_update(Play& play, Settings& settings)
     character = play.character;
     measurement = &settings.measurement;
     ImVec2 screen = ImGui::GetIO().DisplaySize;
+    effects_draw(play, screen);
     if (play.items.tooltip >= 0 && !play.isBlocked && ImGui::BeginTooltip())
     {
         item_details_draw(*character, &character->catalog.items[play.items.tooltip]);

src/ui.h

@@ -70,6 +70,7 @@ public:
     Commands* commands = nullptr;
     Measurement* measurement = nullptr;
     Renderer* renderer = nullptr;
+    float barFills[3] = {};
     float buttonSize = 0;
     float taskbarSlide = 1;
     int characterIndex = 0;
@@ -100,4 +101,5 @@ private:
     void settings_draw(Settings& settings);
     void text_draw(Play& play, ImVec2 screen);
     void toasts_draw(Play& play);
+    void effects_draw(Play& play, ImVec2 screen);
 };