Expose gravity and air drag (#14196)

build-data/paper.at

@@ -167,6 +167,8 @@ public net.minecraft.world.entity.Display$TextDisplay setText(Lnet/minecraft/net
 public net.minecraft.world.entity.Display$TextDisplay setTextOpacity(B)V
 public net.minecraft.world.entity.Entity DATA_TICKS_FROZEN
 public net.minecraft.world.entity.Entity FLAG_INVISIBLE
+public net.minecraft.world.entity.Entity getAirDrag()F
+public net.minecraft.world.entity.Entity getDefaultGravity()D
 public net.minecraft.world.entity.Entity getEncodeId()Ljava/lang/String;
 public net.minecraft.world.entity.Entity getFireImmuneTicks()I
 public net.minecraft.world.entity.Entity getSharedFlag(I)Z

paper-api/src/main/java/org/bukkit/entity/Entity.java

@@ -921,6 +921,27 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
      */
     void setGravity(boolean gravity);
 
+    /**
+     * Returns the default acceleration due to gravity (in blocks per tick). Ignores {@link Entity#hasGravity()}.
+     *
+     * @return the default acceleration due to gravity
+     */
+    double getDefaultGravity();
+
+    /**
+     * Returns the acceleration due to gravity (in blocks per tick). If {@link Entity#hasGravity()} is false, returns 0.
+     *
+     * @return the acceleration due to gravity
+     */
+    double getGravity();
+
+    /**
+     * Returns the air drag factor applied to this entity.
+     *
+     * @return the air drag factor
+     */
+    float getAirDrag();
+
     /**
      * Gets the period of time (in ticks) before this entity can use a portal.
      *

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java

@@ -938,6 +938,21 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         this.getHandle().setNoGravity(!gravity);
     }
 
+    @Override
+    public double getDefaultGravity() {
+        return this.getHandle().getDefaultGravity();
+    }
+
+    @Override
+    public double getGravity() {
+        return this.getHandle().getGravity();
+    }
+
+    @Override
+    public float getAirDrag() {
+        return this.getHandle().getAirDrag();
+    }
+
     @Override
     public int getPortalCooldown() {
         return this.getHandle().getPortalCooldown();