添加炮击指示器缩放功能

src/main/java/com/atsuishio/superbwarfare/client/ClickHandler.java

@@ -219,6 +219,12 @@ public class ClickHandler {
             PacketDistributor.sendToServer(new AdjustMortarAngleMessage(scroll));
             event.setCanceled(true);
         }
+
+        //TODO 为啥还能滚轮换物品？
+        if (player.isUsingItem() && player.getUseItem().is(ModItems.ARTILLERY_INDICATOR.get())) {
+            artilleryIndicatorCustomZoom = Mth.clamp(artilleryIndicatorCustomZoom + 0.4 * scroll, 0, 9);
+            event.setCanceled(true);
+        }
     }
 
     @SubscribeEvent

src/main/java/com/atsuishio/superbwarfare/event/ClientEventHandler.java

@@ -113,6 +113,9 @@ public class ClientEventHandler {
     public static double[] randomShell = {0, 0, 0};
 
     public static double customZoom = 0;
+
+    public static double artilleryIndicatorZoom = 1;
+    public static double artilleryIndicatorCustomZoom = 0;
     public static MillisTimer clientTimer = new MillisTimer();
     public static MillisTimer clientTimerVehicle = new MillisTimer();
 
@@ -1460,6 +1463,22 @@ public class ClientEventHandler {
             return;
         }
 
+        double factor;
+
+        if (stack.is(ModItems.ARTILLERY_INDICATOR.get())) {
+            if (player.isUsingItem() && player.getUseItem().is(ModItems.ARTILLERY_INDICATOR.get())) {
+                factor = 2 + artilleryIndicatorCustomZoom;
+            } else {
+                factor = 1;
+            }
+        } else {
+            factor = 1;
+        }
+
+        artilleryIndicatorZoom = Mth.lerp(0.6 * times, artilleryIndicatorZoom, factor);
+
+        event.setFOV(event.getFOV() / artilleryIndicatorZoom);
+
         if (stack.getItem() instanceof GunItem) {
             if (!event.usedConfiguredFov()) {
                 return;

src/main/java/com/atsuishio/superbwarfare/item/ArtilleryIndicator.java

@@ -34,7 +34,6 @@ public class ArtilleryIndicator extends Item {
     @Override
     @ParametersAreNonnullByDefault
     public @NotNull InteractionResultHolder<ItemStack> use(Level worldIn, Player playerIn, InteractionHand handIn) {
-        ItemStack stack = playerIn.getItemInHand(handIn);
         playerIn.playSound(SoundEvents.SPYGLASS_USE, 1.0F, 1.0F);
         return ItemUtils.startUsingInstantly(worldIn, playerIn, handIn);
     }