Add Ion Deluge animation (#5467)

data/battle_anim_scripts.s

@@ -7710,6 +7710,17 @@ gBattleAnimMove_NobleRoar::
 	end
 
 gBattleAnimMove_IonDeluge::
+	loadspritegfx ANIM_TAG_IONS
+	loopsewithpan SE_M_THUNDERBOLT2, SOUND_PAN_ATTACKER, 10, 12
+	createvisualtask AnimTask_BlendBattleAnimPal, 10, (F_PAL_BG | F_PAL_BATTLERS_2), 2, 0, 4, RGB_YELLOW
+	waitforvisualfinish
+	createvisualtask AnimTask_CreateIons, 2, 0, 3, 120
+	createvisualtask AnimTask_CreateIons, 2, 0, 3, 120
+	delay 120
+	delay 30
+	waitforvisualfinish
+	createvisualtask AnimTask_BlendBattleAnimPal, 10, (F_PAL_BG | F_PAL_BATTLERS_2), 2, 4, 0, RGB_YELLOW
+	waitforvisualfinish
 	end
 
 gBattleAnimMove_ParabolicCharge::

src/battle_anim_electric.c

@@ -29,6 +29,8 @@ static bool8 CreateShockWaveBoltSprite(struct Task *task, u8 taskId);
 static void AnimShockWaveProgressingBolt(struct Sprite *);
 static bool8 CreateShockWaveLightningSprite(struct Task *task, u8 taskId);
 static void AnimShockWaveLightning(struct Sprite *sprite);
+static void AnimIon(struct Sprite *);
+static void AnimIon_Step(struct Sprite *);
 
 static const union AnimCmd sAnim_Lightning[] =
 {
@@ -559,6 +561,34 @@ const struct SpriteTemplate gSeedFlareGreenChargeTemplate =
     .callback = AnimGrowingChargeOrb
 };
 
+static const union AnimCmd sAnim_Ion[] =
+{
+    ANIMCMD_FRAME(0, 2),
+    ANIMCMD_FRAME(8, 2),
+    ANIMCMD_FRAME(16, 2),
+    ANIMCMD_FRAME(24, 6),
+    ANIMCMD_FRAME(32, 2),
+    ANIMCMD_FRAME(40, 2),
+    ANIMCMD_FRAME(48, 2),
+    ANIMCMD_END,
+};
+
+static const union AnimCmd *const sAnims_Ion[] =
+{
+    sAnim_Ion,
+};
+
+const struct SpriteTemplate gIonSpriteTemplate =
+{
+    .tileTag = ANIM_TAG_IONS,
+    .paletteTag = ANIM_TAG_IONS,
+    .oam = &gOamData_AffineOff_ObjNormal_16x32,
+    .anims = sAnims_Ion,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = AnimIon,
+};
+
 // functions
 static void AnimLightning(struct Sprite *sprite)
 {
@@ -1452,3 +1482,44 @@ static void AnimShockWaveLightning(struct Sprite *sprite)
         DestroySprite(sprite);
     }
 }
+
+// Copy of Rain Dance's function but displays the ion sprite instead
+// arg 0: initial step
+// arg 1: amount (?)
+// arg 2: duration
+void AnimTask_CreateIons(u8 taskId)
+{
+    u8 x, y;
+
+    if (gTasks[taskId].data[0] == 0)
+    {
+        gTasks[taskId].data[1] = gBattleAnimArgs[0];
+        gTasks[taskId].data[2] = gBattleAnimArgs[1];
+        gTasks[taskId].data[3] = gBattleAnimArgs[2];
+    }
+    gTasks[taskId].data[0]++;
+    if (gTasks[taskId].data[0] % gTasks[taskId].data[2] == 1)
+    {
+        x = Random2() % DISPLAY_WIDTH;
+        y = Random2() % (DISPLAY_HEIGHT / 2);
+        CreateSprite(&gIonSpriteTemplate, x, y, 4);
+    }
+    if (gTasks[taskId].data[0] == gTasks[taskId].data[3])
+        DestroyAnimVisualTask(taskId);
+}
+
+static void AnimIon(struct Sprite *sprite)
+{
+    sprite->callback = AnimIon_Step;
+}
+
+static void AnimIon_Step(struct Sprite *sprite)
+{
+    if (++sprite->data[0] <= 13)
+    {
+        sprite->x2++;
+        sprite->y2 += 4;
+    }
+    if (sprite->animEnded)
+        DestroySprite(sprite);
+}