Adds fading for the oxygen bar.

This should fix #2. Thanks, @Reddy64!

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id 'fabric-loom' version '0.10-SNAPSHOT'
+	id 'fabric-loom' version '0.11-SNAPSHOT'
 	id 'maven-publish'
 }
 

gradle.properties

@@ -4,12 +4,12 @@ org.gradle.jvmargs=-Xmx4G
 # Fabric Properties
 	# check these on https://fabricmc.net/use
 	minecraft_version=1.18.1
-	yarn_mappings=1.18.1+build.1
+	yarn_mappings=1.18.1+build.22
 	loader_version=0.12.12
 
 cloth_version=6.1.48
 modmenu_version=3.0.1
-fabric_version=0.44.0+1.18
+fabric_version=0.46.2+1.18
 
 # Mod Properties
 	mod_version = 1.3

src/main/java/markil3/immersive_hud/ConfigManager.java

@@ -90,6 +90,7 @@ public class ConfigManager
     private TimeValues jumpTime = new TimeValues();
     private TimeValues healthTime = new TimeValues();
     private TimeValues hungerTime = new TimeValues();
+    private TimeValues airTime = new TimeValues();
     private TimeValues effectTime = new TimeValues();
     private int crosshairTime = 6 * TICKS_PER_SECOND;
     private boolean hideCrosshair = true;
@@ -98,6 +99,7 @@ public class ConfigManager
     private boolean showArmor = true;
     private double minHealth = 0.5;
     private int minHunger = 17;
+    private int minAir = 300;
     private Identifier[] ignoredItems = new Identifier[]{Registry.ITEM.getId(Items.FIREWORK_ROCKET)};
     private Identifier[] enchantingBlocks = new Identifier[]{Registry.BLOCK.getId(Blocks.ENCHANTING_TABLE), Registry.BLOCK.getId(Blocks.ANVIL), Registry.BLOCK.getId(Blocks.BOOKSHELF), Registry.BLOCK.getId(Blocks.FURNACE), Registry.BLOCK.getId(Blocks.BLAST_FURNACE), Registry.BLOCK.getId(Blocks.SMOKER), Registry.BLOCK.getId(Blocks.GRINDSTONE)};
 
@@ -178,6 +180,11 @@ public class ConfigManager
         return this.hungerTime;
     }
     
+    public TimeValues getAirTime()
+    {
+        return this.airTime;
+    }
+
     /**
      * Obtains time values related to potion effects.
      *
@@ -259,6 +266,17 @@ public class ConfigManager
         return this.minHunger;
     }
     
+    /**
+     * Obtains the minimum oxygen for fading. Anything below that and the oxygen
+     * always displays.
+     *
+     * @return The oxygen boundary, from 0 to 20.
+     */
+    public int getMinAir()
+    {
+        return this.minAir;
+    }
+
     /**
      * Obtains a collection of items that won't cause hands and crosshairs to show when used.
      *
@@ -371,6 +389,17 @@ public class ConfigManager
         this.minHunger = MathHelper.clamp(boundary, 0, 20);
     }
     
+    /**
+     * Sets the minimum oxygen value for fading. Anything below that and the
+     * air bar always displays.
+     *
+     * @param boundary - The air boundary, from 0 to 20.
+     */
+    public void setMinAir(int boundary)
+    {
+        this.minAir = MathHelper.clamp(boundary, 0, 20);
+    }
+
     /**
      * Sets which items won't cause the hands and crosshairs to show when used.
      *

src/main/java/markil3/immersive_hud/ModMenu.java

@@ -125,6 +125,9 @@ public class ModMenu implements ModMenuApi
             startTimeField("hunger", entryBuilder,
                     general,
                     instance.getHungerTime());
+            startTimeField("air", entryBuilder,
+                    general,
+                    instance.getAirTime());
             startTimeField("effect", entryBuilder,
                     general,
                     instance.getPotionTime());
@@ -185,6 +188,15 @@ public class ModMenu implements ModMenuApi
                     .setSaveConsumer(val -> instance.setMinHunger(val))
                     .build());
     
+            general.addEntry(entryBuilder.startIntField(new TranslatableText(
+                                    "option.immersive_hud.minAir"),
+                            instance.getMinAir())
+                    .setDefaultValue(300)
+                    .setTooltip(new TranslatableText(
+                            "tooltip.immersive_hud.minAir"))
+                    .setSaveConsumer(val -> instance.setMinAir(val))
+                    .build());
+
             general.addEntry(entryBuilder.startBooleanToggle(new TranslatableText(
                             "option.immersive_hud.showArmor"),
                     instance.shouldShowArmor())

src/main/java/markil3/immersive_hud/TimerUtils.java

@@ -131,11 +131,21 @@ public class TimerUtils
      * in hunger.
      */
     private static int hunger = -1;
+    /**
+     * Records what the oxygen level was previously. Used to check for a change
+     * in oxygen.
+     */
+    private static int air = -1;
     /**
      * Records whether or not there was food poisoning. Used to check for a
      * change in hunger.
      */
     private static boolean isFoodPoisoned = false;
+    /**
+     * How many more ticks the oxygen bar will be onscreen. Every tick is 1/20th
+     * of a second.
+     */
+    private static double airTime;
 
     /**
      * How many more ticks the mount's health bar will be onscreen. Every tick
@@ -256,6 +266,8 @@ public class TimerUtils
                 ConfigManager.getInstance().getJumpTime();
         ConfigManager.TimeValues healthTimes = ConfigManager.getInstance().getHealthTime();
         ConfigManager.TimeValues hungerTimes = ConfigManager.getInstance().getHungerTime();
+        ConfigManager.TimeValues airTimes =
+                ConfigManager.getInstance().getAirTime();
 
         float hotbarAlpha = Main.getAlpha(hotbarTime,
                 hotbar.getMaxTime(),
@@ -277,13 +289,24 @@ public class TimerUtils
                 hungerTimes.getMaxTime(),
                 hungerTimes.getFadeInTime(),
                 hungerTimes.getFadeOutTime()));
+        statusAlpha = Math.max(statusAlpha, Main.getAlpha(airTime,
+                airTimes.getMaxTime(),
+                airTimes.getFadeInTime(),
+                airTimes.getFadeOutTime()));
         /*
          * Draw it in its standard location until it is completely transparent, then move it
          * instantly.
          */
         statusAlpha = (float) Math.ceil(statusAlpha);
-        return 7 * (1 - Math.max(experienceAlpha,
-                jumpAlpha)) + 22 * (1 - hotbarAlpha) + 42 * (1 - statusAlpha);
+        float trans = 7 * (1 - Math.max(experienceAlpha,
+                jumpAlpha)) + 22 * (1 - hotbarAlpha) + 42 * (1 - statusAlpha) +  9 * (1 - Math.max(Main.getAlpha(hungerTime,
+                hungerTimes.getMaxTime(),
+                hungerTimes.getFadeInTime(),
+                hungerTimes.getFadeOutTime()), Main.getAlpha(healthTime,
+                healthTimes.getMaxTime(),
+                healthTimes.getFadeInTime(),
+                healthTimes.getFadeOutTime())));
+        return trans;
     }
 
     /**
@@ -849,6 +872,93 @@ public class TimerUtils
                 .hasStatusEffect(StatusEffects.HUNGER);
     }
     
+    /**
+     * Determines whether or not to draw the oxygen bar, adjusting the alpha as
+     * needed.
+     *
+     * @return If true, then cancel drawing the oxygen bar.
+     *
+     * @since 1.3.1-1.18-fabric
+     */
+    public static boolean drawAir(float ticks)
+    {
+        /*
+         * When air falls to this level or below, the oxygen bar won't
+         * disappear, allowing the player to be constantly reminded of their
+         * low oxygen.
+         */
+        final int AIR_BOUNDARY = ConfigManager.getInstance().getMinAir();
+        ConfigManager.TimeValues airTimes =
+                ConfigManager.getInstance().getAirTime();
+    
+        MinecraftClient mc = MinecraftClient.getInstance();
+        PlayerEntity entity;
+        boolean canceled;
+        boolean changed = false;
+    
+        if (mc.getCameraEntity() instanceof PlayerEntity)
+        {
+            entity = (PlayerEntity) mc.getCameraEntity();
+        }
+        else
+        {
+            return true;
+        }
+    
+        if (air != entity.getAir())
+        {
+            float dividor = entity.getMaxAir() / 10;
+            if (air / dividor != entity.getAir() / dividor)
+            {
+                changed = true;
+            }
+            air = entity.getAir();
+        }
+        if (air <= AIR_BOUNDARY)
+        {
+            changed = true;
+        }
+        if (entity.hasStatusEffect(StatusEffects
+                .CONDUIT_POWER) || entity.hasStatusEffect(StatusEffects
+                .WATER_BREATHING))
+        {
+            changed = false;
+        }
+        if (changed)
+        {
+            airTime = airTimes.getMaxTime() - (airTime > 0 ?
+                    airTimes.getFadeInTime() :
+                    0);
+        }
+        else if (airTime > 0)
+        {
+            airTime -= ticks;
+        }
+    
+        if (airTime <= 0 && (air >= AIR_BOUNDARY || entity.hasStatusEffect(StatusEffects
+                .CONDUIT_POWER) || entity.hasStatusEffect(StatusEffects
+                .WATER_BREATHING)))
+        {
+            return true;
+        }
+        /*
+         * Only makes a change if the player is healthy. Otherwise,
+         * the bar is shown.
+         */
+        if (entity.getAir() >= entity.getMaxAir() || entity.hasStatusEffect(StatusEffects
+                .CONDUIT_POWER) || entity.hasStatusEffect(StatusEffects
+                .WATER_BREATHING))
+        {
+            setAlpha(Main.getAlpha(airTime,
+                    airTimes.getMaxTime(),
+                    airTimes.getFadeInTime(),
+                    airTimes.getFadeOutTime()));
+        }
+        return airTime == 0 && entity.getAir() >= entity.getMaxAir() && !entity.hasStatusEffect(StatusEffects
+                .CONDUIT_POWER) && !entity.hasStatusEffect(StatusEffects
+                .WATER_BREATHING);
+    }
+
     /**
      * Determines whether or not to draw the horse jump bar, adjusting the alpha
      * as needed.

src/main/java/markil3/immersive_hud/mixin/HudHook.java

@@ -253,8 +253,9 @@ public class HudHook
     {
         try
         {
+            float trans = TimerUtils.getHealthTranslation();
             stack.push();
-            stack.translate(0F, TimerUtils.getHealthTranslation(), 0F);
+            stack.translate(0F, trans, 0F);
         }
         catch (Exception e)
         {
@@ -381,6 +382,10 @@ public class HudHook
              * Resets the color so that nothing else is bothered.
              */
             TimerUtils.setAlpha(1F);
+            if (TimerUtils.drawAir(MinecraftClient.getInstance().getTickDelta()))
+            {
+                TimerUtils.setAlpha(0F);
+            }
         }
         catch (Exception e)
         {
@@ -398,6 +403,7 @@ public class HudHook
     {
         try
         {
+            TimerUtils.setAlpha(1F);
             stack.pop();
         }
         catch (Exception e)

src/main/resources/assets/immersive_hud/lang/en_us.json

@@ -15,6 +15,9 @@
   "option.immersive_hud.hungerMaxTime": "Hunger Bar Display Time",
   "option.immersive_hud.hungerFadeIn": "Hunger Bar Fade In Time",
   "option.immersive_hud.hungerFadeOut": "Hunger Bar Fade Out Time",
+  "option.immersive_hud.airMaxTime": "Oxygen Bar Display Time",
+  "option.immersive_hud.airFadeIn": "Oxygen Bar Fade In Time",
+  "option.immersive_hud.airFadeOut": "Oxygen Bar Fade Out Time",
   "option.immersive_hud.effectMaxTime": "Potion Display Time",
   "option.immersive_hud.effectFadeIn": "Potion Fade In Time",
   "option.immersive_hud.effectFadeOut": "Potion Fade Out Time",
@@ -24,6 +27,7 @@
   "option.immersive_hud.hideHands": "Hide Hands",
   "option.immersive_hud.minHealth": "Minimum Health Fade",
   "option.immersive_hud.minHunger": "Minimum Hunger Fade",
+  "option.immersive_hud.minAir": "Minimum Oxygen Fade",
   "option.immersive_hud.showArmor": "Show Armor",
   "option.immersive_hud.ignoreList": "Ignored Items",
   "option.immersive_hud.enchantingList": "Experience Blocks",
@@ -42,6 +46,9 @@
   "tooltip.immersive_hud.hungerMaxTime": "How long the hunger bar can be displayed on screen in seconds",
   "tooltip.immersive_hud.hungerFadeIn": "How many seconds it takes for the hunger bar to fade in",
   "tooltip.immersive_hud.hungerFadeOut": "How many seconds it takes for the hunger bar to fade out",
+  "tooltip.immersive_hud.airMaxTime": "How long the hunger bar can be oxygen on screen in seconds",
+  "tooltip.immersive_hud.airFadeIn": "How many seconds it takes for the oxygen bar to fade in",
+  "tooltip.immersive_hud.airFadeOut": "How many seconds it takes for the oxygen bar to fade out",
   "tooltip.immersive_hud.effectMaxTime": "How long potion icons can be displayed on screen in seconds",
   "tooltip.immersive_hud.effectFadeIn": "How many seconds it takes for potion icons to fade in",
   "tooltip.immersive_hud.effectFadeOut": "How many seconds it takes for potion icons to fade out",
@@ -51,6 +58,7 @@
   "tooltip.immersive_hud.hideHands": "Whether or not hands should be hidden after a period of time",
   "tooltip.immersive_hud.minHealth": "When the percentage of health goes below this level, the health bar won't fade away",
   "tooltip.immersive_hud.minHunger": "When the hunger level goes below this level, the hunger bar won't fade away",
+  "tooltip.immersive_hud.minAir": "When the oxygen level goes below this level, the oxygen bar won't fade away",
   "tooltip.immersive_hud.showArmor": "Whether or not the armor bar should display on the HUD",
   "tooltip.immersive_hud.ignoreList": "Which items will not trigger the arm and crosshairs when used",
   "tooltip.immersive_hud.enchantingList": "Which blocks will show the experience bar when looked at.",