Draw the touch ring in engine instead of a particle

MODDING.md

@@ -174,7 +174,6 @@ The first expand area is treated as the belly: it breathes, jiggles when smacked
 | `scaleCycles` | float | How many oscillations the scale effect performs. Defaults to 1. |
 | `scaleTime` | float, seconds | How long the scale effect lasts. Defaults to a third of a second. |
 | `sounds` | paths | Sounds played when interacting. |
-| `particles` | strings | Particles (see `particles`) spawned when interacting. |
 
 ### sounds
 | Key | Meaning |
@@ -186,12 +185,11 @@ The first expand area is treated as the belly: it breathes, jiggles when smacked
 How items move in the background (`gfx/area.anm2`): `gravity` (applied to items' velocities per tick), `friction` (applied when items are grounded or hit walls) and `airResistance`.
 
 ### cursor
-The cursor's sounds and particles. Its look is `gfx/cursor.anm2` (see "Fixed files and names").
+The cursor's sounds. Its look is `gfx/cursor.anm2` (see "Fixed files and names").
 
 | Key | Meaning |
 |---|---|
 | `sounds` | `grab` (grabbing an item), `release` (letting go) and `throw` (letting go while dragging quickly). |
-| `particles` | `grab`: particles spawned when grabbing an item. |
 
 ### menu
 The UI's sounds.
@@ -201,7 +199,7 @@ 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. The `Circle` particle is also spawned where an item lands hard.
+An object of particles by name, each with the `anm2` and `animation` it plays once where spawned. (The ring where something is touched, grabbed or lands hard is drawn by the game, not a particle.)
 
 # items.json
 

resources/common/character.json

@@ -20,8 +20,7 @@
       "isHold": true,
       "cursorHover": "Hover",
       "cursorActive": "Rub",
-      "sounds": ["sfx/rub.ogg"],
-      "particles": ["Circle"]
+      "sounds": ["sfx/rub.ogg"]
     },
     "Smack": {
       "icon": "smack",
@@ -30,21 +29,18 @@
       "dialogueCooldown": 0.6667,
       "scaleAmplitude": 1,
       "scaleCycles": 3,
-      "sounds": "sfx/smack*.ogg",
-      "particles": ["Circle"]
+      "sounds": "sfx/smack*.ogg"
     },
     "Kiss": {
       "icon": "kiss",
       "cursorHover": "KissHover",
       "cursorActive": "Kiss",
-      "sounds": "sfx/kiss*.ogg",
-      "particles": ["Circle"]
+      "sounds": "sfx/kiss*.ogg"
     },
-    "Turn Around": {"icon": "turn", "sounds": ["sfx/turn.ogg"], "particles": ["Circle"]}
+    "Turn Around": {"icon": "turn", "sounds": ["sfx/turn.ogg"]}
   },
   "cursor": {
-    "sounds": {"grab": ["sfx/grab.ogg"], "release": ["sfx/release.ogg"], "throw": "sfx/throw*.ogg"},
-    "particles": {"grab": ["Circle"]}
+    "sounds": {"grab": ["sfx/grab.ogg"], "release": ["sfx/release.ogg"], "throw": "sfx/throw*.ogg"}
   },
   "menu": {
     "sounds": {
@@ -56,7 +52,6 @@
     }
   },
   "particles": {
-    "Circle": {"anm2": "gfx/circle.anm2", "animation": "Main"},
     "Puff": {"anm2": "gfx/puff.anm2", "animation": "Main"}
   },
   "area": {"gravity": 0.95, "friction": 0.75, "airResistance": 0.975}

resources/common/gfx/circle.anm2

@@ -1,48 +0,0 @@
-{
-  "anm2ed": 1,
-  "info": {},
-  "spritesheets": [
-    {
-      "path": "circle.png",
-      "regions": [
-        {
-          "name": "Main",
-          "size": [128, 128],
-          "pivot": [64, 64],
-          "origin": "center"
-        }
-      ]
-    }
-  ],
-  "layers": [
-    {"name": "Main"}
-  ],
-  "defaultAnimation": "Spawn",
-  "animations": {
-    "Spawn": {
-      "length": 11,
-      "loop": false,
-      "root": [
-        {"delay": 11}
-      ],
-      "layers": [
-        {
-          "layer": 0,
-          "frames": [
-            {
-              "region": 0,
-              "scale": [10, 10],
-              "delay": 10,
-              "interpolation": "linear"
-            },
-            {
-              "region": 0,
-              "tint": [255, 255, 255, 0],
-              "interpolation": "linear"
-            }
-          ]
-        }
-      ]
-    }
-  }
-}

src/character.cpp

@@ -118,7 +118,7 @@ static void interact_parse(object source, InteractArea& area, Character& charact
     json_keys_check(source,
                     {"type", "null", "layer", "icon", "isHold", "animation", "idleOnEnd", "cursorHover", "cursorActive",
                      "dialoguePool", "dialogueCooldown", "digestionClick", "digestionHover",
-                     "scaleAmplitude", "scaleCycles", "scaleTime", "sounds", "particles"},
+                     "scaleAmplitude", "scaleCycles", "scaleTime", "sounds"},
                     "an interact area");
     area.animation = json_string(source, "animation", area.animation);
     area.cursorActive = json_string(source, "cursorActive", area.cursorActive);
@@ -137,8 +137,6 @@ static void interact_parse(object source, InteractArea& area, Character& charact
         area.layer = character.anm2 ? character.anm2->layer_get(json_string(source, "layer")) : -1;
     if (!source["null"].error())
         area.null = character.anm2 ? character.anm2->null_get(json_string(source, "null")) : -1;
-    if (!source["particles"].error())
-        area.particles = json_strings(source, "particles");
     if (!source["sounds"].error())
         area.sounds = audio.sounds_get(character.roots, json_strings(source, "sounds"));
 }
@@ -259,11 +257,7 @@ static void character_parse(object root, Character& character, Renderer& rendere
     float_read(area, "friction", character.area.friction);
     float_read(area, "airResistance", character.area.airResistance);
 
-    object cursor = json_object(root, "cursor");
-    object cursorParticles = json_object(cursor, "particles");
-    json_keys_check(cursor, {"sounds", "particles"}, "cursor");
-    if (!cursorParticles["grab"].error())
-        character.cursor.grabParticles = json_strings(cursorParticles, "grab");
+    json_keys_check(json_object(root, "cursor"), {"sounds"}, "cursor");
     json_keys_check(json_object(root, "menu"), {"sounds"}, "menu");
 
     for (auto [name, value] : json_object(root, "particles"))

src/character.h

@@ -84,7 +84,6 @@ struct InteractArea
     std::string icon;
     std::string idleOnEnd;
     std::string name;
-    std::vector<std::string> particles;
     Sounds sounds;
     float digestionClick = 0;
     float digestionHover = 0;
@@ -283,7 +282,6 @@ struct Swap
 
 struct Cursor
 {
-    std::vector<std::string> grabParticles;
     Anm2* anm2 = nullptr;
 };
 

src/effects.cpp

@@ -1,5 +1,6 @@
 #include "effects.h"
 
+constexpr Spark RING_SPARK = {WHITE, {}, {}, {}, 0, 64, 20, 0, SPARK_RING};
 constexpr float FLASH_FADE = 0.04f;
 constexpr float FLOATER_RISE = 0.8f;
 constexpr float SPARK_DRAG = 0.95f;
@@ -36,6 +37,14 @@ void Effects::spark_add(Spark spark)
     sparks.push_back(spark);
 }
 
+// A white ring growing and fading where something was touched or hit.
+void Effects::ring_add(Vec2 position)
+{
+    Spark spark = RING_SPARK;
+    spark.position = position;
+    spark_add(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)
 {

src/effects.h

@@ -15,6 +15,7 @@ enum SparkShape
 {
     SPARK_CIRCLE,
     SPARK_LINE,
+    SPARK_RING,
     SPARK_STAR
 };
 
@@ -27,8 +28,8 @@ struct Floater
     FloaterType type = FLOATER_CALORIES;
 };
 
-// A glint, puff or line (from its position to its end) that drifts, falls (or rises) by its gravity, and fades over its
-// life.
+// A glint, puff, line (from its position to its end) or ring (growing to its size) that drifts, falls (or rises) by its
+// gravity, and fades over its life.
 struct Spark
 {
     Color color;
@@ -54,4 +55,5 @@ public:
     void floater_add(Vec2 position, float value, FloaterType type);
     void spark_add(Spark spark);
     void burst_add(Spark spark, int count, float speed);
+    void ring_add(Vec2 position);
 };

src/interact.cpp

@@ -62,7 +62,7 @@ void Interactions::update(Play& play, Pointer pointer)
                 }
                 play.audio->play(entry.sounds);
                 body.idle_override_set(entry.idleOnEnd);
-                play.particles_spawn(entry.particles, pointer.position);
+                play.effects.ring_add(pointer.position);
                 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);

src/items.cpp

@@ -10,7 +10,6 @@ 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* IMPACT_PARTICLE = "Circle";
 constexpr float BITE_JIGGLE = 4;
 constexpr float IMPACT_SPEED = 12;
 constexpr float FANFARE_MIN = 0.75f;
@@ -360,7 +359,7 @@ void Items::update(Play& play, Pointer pointer)
             if (pointer.isClicked)
             {
                 audio.play(character.sounds[SOUND_GRAB]);
-                play.particles_spawn(character.cursor.grabParticles, pointer.position);
+                play.effects.ring_add(pointer.position);
                 isJustHeld = true;
             }
             if (pointer.isDown)
@@ -394,7 +393,7 @@ void Items::update(Play& play, Pointer pointer)
             if (impact > 0)
                 audio.play(character.sounds[SOUND_BOUNCE]);
             if (impact >= IMPACT_SPEED)
-                play.particles_spawn({IMPACT_PARTICLE}, position);
+                play.effects.ring_add(position);
             entity.isThrown &= vec2_length(entity.velocity) >= TRAIL_SPEED;
             if (entity.isThrown)
             {

src/ui.cpp

@@ -31,6 +31,8 @@ constexpr float BAR_SHAKE_SPEED = 40;
 constexpr float FLOATER_SHADOW = 3;
 constexpr float OVERSTUFFED_PULSE = 0.35f;
 constexpr float OVERSTUFFED_SPEED = 6;
+constexpr float RING_START = 0.1f;
+constexpr float RING_THICKNESS = 3;
 constexpr float STAR_WAIST = 0.3f;
 constexpr float BAR_WIDTH_MIN = 120;
 constexpr float BUTTON_SIZE_MAX = 96;
@@ -741,6 +743,12 @@ void Ui::effects_draw(Play& play, ImVec2 screen)
             drawList->AddCircleFilled({at.x, at.y}, size, color);
             continue;
         }
+        if (spark.shape == SPARK_RING)
+        {
+            float radius = spark.size * view.a * (RING_START + (1 - RING_START) * (1 - fade));
+            drawList->AddCircle({at.x, at.y}, radius, color, 0, RING_THICKNESS * view.a);
+            continue;
+        }
         if (spark.shape == SPARK_LINE)
         {
             Vec2 end = view * spark.end;