Belly churns after gurgles

MODDING.md

@@ -150,7 +150,7 @@ 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 stage-up effects and gained weight come from.
+The first expand area is treated as the belly: it breathes, jiggles when smacked, rubbed or fed, churns when it gurgles, and is where stage-up effects and gained weight 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.

src/body.cpp

@@ -2,6 +2,8 @@
 
 constexpr float BREATH_AMPLITUDE = 1.5f;
 constexpr float BREATH_SPEED = 2.2f;
+constexpr float CHURN_JIGGLE = 0.8f;
+constexpr float CHURN_TIME = 0.75f;
 constexpr float JIGGLE_DAMPING = 0.12f;
 constexpr float JIGGLE_STIFFNESS = 0.18f;
 constexpr float SWAP_STEP = 0.5f;
@@ -250,7 +252,12 @@ void Body::update(std::vector<Event>& events)
     }
     values_clamp();
     if (is_chance(traits.gurgleChance * capacity_percent_get() * traits.gurgleCapacityMultiplier))
+    {
         audio->play(character->sounds[SOUND_GURGLE]);
+        churn = (int)(CHURN_TIME * TICK_RATE);
+    }
+    if (churn > 0)
+        jiggle_add(random_get(-CHURN_JIGGLE, CHURN_JIGGLE) * churn-- / (CHURN_TIME * TICK_RATE));
     if (int current = stage_get(stats.weight); current != stage)
         stage_set(current);
 

src/play.h

@@ -75,7 +75,8 @@ struct Toast
 class Play;
 
 // 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.
+// area) breathes and jiggles on a spring, churning for a while after each gurgle, and freeze holds the body still for
+// a hit's few ticks.
 class Body
 {
 public:
@@ -90,6 +91,7 @@ public:
     float jiggle = 0;
     float jiggleVelocity = 0;
     float talkTime = 0;
+    int churn = 0;
     int freeze = 0;
     int stage = 0;
     bool isBlinking = false;