1 files changed, 86 insertions, 0 deletions
diff --git a/src/battle/anim/homing.c b/src/battle/anim/homing.c
new file mode 100755
index 000000000..c5e372d78
--- /dev/null
+++ b/src/battle/anim/homing.c
@@ -0,0 +1,86 @@
+#include "global.h"
+#include "rom_8077ABC.h"
+#include "trig.h"
+#include "battle_anim.h"
+#include "sound.h"
+
+extern s16 gBattleAnimArgs[];
+extern u8 gBattleAnimBankAttacker;
+extern u8 gBattleAnimBankTarget;
+
+static void sub_80CC7D4(struct Sprite* sprite);
+
+// homing (the spinning effect of sprites going inward in a static rotation.)
+// Used by Needle Arm.
+
+void sub_80CC6CC(struct Sprite* sprite)
+{
+    u8 a;
+    u8 b;
+    u16 c;
+    u16 x;
+    u16 y;
+
+    if (gBattleAnimArgs[4] == 0)
+    {
+        move_anim_8072740(sprite);
+    }
+    else
+    {
+        if (gBattleAnimArgs[0] == 0)
+        {
+            a = sub_8077ABC(gBattleAnimBankAttacker, 2);
+            b = sub_8077ABC(gBattleAnimBankAttacker, 3);
+        }
+        else
+        {
+            a = sub_8077ABC(gBattleAnimBankTarget, 2);
+            b = sub_8077ABC(gBattleAnimBankTarget, 3);
+        }
+
+        sprite->data[0] = gBattleAnimArgs[4];
+        if (gBattleAnimArgs[1] == 0)
+        {
+            sprite->pos1.x = gBattleAnimArgs[2] + a;
+            sprite->pos1.y = gBattleAnimArgs[3] + b;
+            sprite->data[5] = a;
+            sprite->data[6] = b;
+        }
+        else
+        {
+            sprite->pos1.x = a;
+            sprite->pos1.y = b;
+            sprite->data[5] = gBattleAnimArgs[2] + a;
+            sprite->data[6] = gBattleAnimArgs[3] + b;
+        }
+
+        x = sprite->pos1.x;
+        sprite->data[1] = x * 16;
+        y = sprite->pos1.y;
+        sprite->data[2] = y * 16;
+        sprite->data[3] = (sprite->data[5] - sprite->pos1.x) * 16 / gBattleAnimArgs[4];
+        sprite->data[4] = (sprite->data[6] - sprite->pos1.y) * 16 / gBattleAnimArgs[4];
+        c = sub_80790F0(sprite->data[5] - x, sprite->data[6] - y);
+        if (NotInBattle())
+            c -= 0x8000;
+
+        sub_8078FDC(sprite, 0, 0x100, 0x100, c);
+        sprite->callback = sub_80CC7D4;
+    }
+}
+
+void sub_80CC7D4(struct Sprite* sprite)
+{
+    if (sprite->data[0])
+    {
+        sprite->data[1] += sprite->data[3];
+        sprite->data[2] += sprite->data[4];
+        sprite->pos1.x = sprite->data[1] >> 4 ;
+        sprite->pos1.y = sprite->data[2] >> 4 ;
+        sprite->data[0]--;
+    }
+    else
+    {
+        move_anim_8074EE0(sprite);
+    }
+}