Two units complete

core/src/mindustry/entities/abilities/MoveEffectAbility.java

@@ -0,0 +1,41 @@
+package mindustry.entities.abilities;
+
+import arc.graphics.*;
+import arc.util.*;
+import mindustry.content.*;
+import mindustry.entities.*;
+import mindustry.gen.*;
+
+public class MoveEffectAbility extends Ability{
+    public float minVelocity = 0.08f;
+    public float interval = 3f;
+    public float x, y;
+    public boolean rotateEffect = false;
+    public float effectParam = 3f;
+    public boolean teamColor = false;
+    public Color color = Color.white;
+    public Effect effect = Fx.missileTrail;
+
+    protected float counter;
+
+    public MoveEffectAbility(float x, float y, Color color, Effect effect, float interval){
+        this.x = x;
+        this.y = y;
+        this.color = color;
+        this.effect = effect;
+        this.interval = interval;
+    }
+
+    public MoveEffectAbility(){
+    }
+
+    @Override
+    public void update(Unit unit){
+        counter += Time.delta;
+        if(unit.vel.len2() >= minVelocity * minVelocity && (counter >= interval)){
+            Tmp.v1.trns(unit.rotation - 90f, x, y);
+            counter %= interval;
+            effect.at(Tmp.v1.x + unit.x, Tmp.v1.y + unit.y, rotateEffect ? unit.rotation : effectParam, teamColor ? unit.team.color : color);
+        }
+    }
+}

core/src/mindustry/entities/bullet/BulletType.java

@@ -151,7 +151,7 @@ public class BulletType extends Content implements Cloneable{
     public float fragVelocityMin = 0.2f, fragVelocityMax = 1f, fragLifeMin = 1f, fragLifeMax = 1f;
     public @Nullable BulletType fragBullet = null;
     public float bulletInterval = 20f;
-    public int intervalBulletCount = 1;
+    public int intervalBullets = 1;
     public @Nullable BulletType intervalBullet;
     public Color hitColor = Color.white;
     public Color healColor = Pal.heal;
@@ -431,7 +431,7 @@ public class BulletType extends Content implements Cloneable{
 
     public void updateBulletInterval(Bullet b){
         if(intervalBullet != null && b.timer.get(2, bulletInterval)){
-            for(int i = 0; i < intervalBulletCount; i++){
+            for(int i = 0; i < intervalBullets; i++){
                 intervalBullet.create(b, b.x, b.y, Mathf.random(360f));
             }
         }

core/src/mindustry/entities/pattern/ShootBarrel.java

@@ -11,6 +11,7 @@ public class ShootBarrel extends ShootPattern{
         barrels = barrels.clone();
         for(int i = 0; i < barrels.length; i += 3){
             barrels[i] *= -1;
+            barrels[i + 2] *= -1;
         }
     }
 

core/src/mindustry/entities/pattern/ShootHelix.java

@@ -10,7 +10,7 @@ public class ShootHelix extends ShootPattern{
         for(int i = 0; i < shots; i++){
             for(int sign : Mathf.signs){
                 handler.shoot(0, 0, 0, firstShotDelay + shotDelay * i,
-                    b -> b.moveRelative(0f, Mathf.sin(b.time + offset, 2f, mag * sign)));
+                    b -> b.moveRelative(0f, Mathf.sin(b.time + offset, scl, mag * sign)));
             }
         }
     }

core/src/mindustry/entities/pattern/ShootMulti.java

@@ -29,9 +29,9 @@ public class ShootMulti extends ShootPattern{
         source.shoot(totalShots, (x, y, rotation, delay, move) -> {
             for(var pattern : dest){
                 pattern.shoot(totalShots, (x2, y2, rot2, delay2, mover) -> {
-                    handler.shoot(x + x2, y + y2, rotation + rot2, delay + delay2, b -> {
-                        move.move(b);
-                        mover.move(b);
+                    handler.shoot(x + x2, y + y2, rotation + rot2, delay + delay2, move == null && mover == null ? null : b -> {
+                        if(move != null) move.move(b);
+                        if(mover != null) mover.move(b);
                     });
                 });
             }