Implement experience and experiene/xp commands (#521)

* Initial experience support

For some reason I am getting link errors

* Implement experience math

* Fix packet and format/clippy

* Fix translate strings

* Fix experience handling

* Clippy & Format

* Fix experience calculations

* Fix how we store experience.

Math WIP

* Redo all experience calculations

This should be 100% vanilla parity.

pumpkin-protocol/src/client/play/c_set_experience.rs

@@ -0,0 +1,23 @@
+use pumpkin_data::packet::clientbound::PLAY_SET_EXPERIENCE;
+use pumpkin_macros::client_packet;
+use serde::Serialize;
+
+use crate::VarInt;
+
+#[derive(Serialize)]
+#[client_packet(PLAY_SET_EXPERIENCE)]
+pub struct CSetExperience {
+    progress: f32,
+    level: VarInt,
+    total_experience: VarInt,
+}
+
+impl CSetExperience {
+    pub fn new(progress: f32, level: VarInt, total_experience: VarInt) -> Self {
+        Self {
+            progress,
+            level,
+            total_experience,
+        }
+    }
+}

pumpkin-protocol/src/client/play/mod.rs

@@ -50,6 +50,7 @@ mod c_set_border_warning_distance;
 mod c_set_container_content;
 mod c_set_container_property;
 mod c_set_container_slot;
+mod c_set_experience;
 mod c_set_health;
 mod c_set_held_item;
 mod c_set_time;
@@ -123,6 +124,7 @@ pub use c_set_border_warning_distance::*;
 pub use c_set_container_content::*;
 pub use c_set_container_property::*;
 pub use c_set_container_slot::*;
+pub use c_set_experience::*;
 pub use c_set_health::*;
 pub use c_set_held_item::*;
 pub use c_set_time::*;

pumpkin-util/src/math/experience.rs

@@ -0,0 +1,39 @@
+/// Get the number of points in a level
+pub fn points_in_level(level: i32) -> i32 {
+    match level {
+        0..=15 => 2 * level + 7,
+        16..=30 => 5 * level - 38,
+        _ => 9 * level - 158,
+    }
+}
+
+/// Calculate the total number of points to reach a level
+pub fn points_to_level(level: i32) -> i32 {
+    match level {
+        0..=15 => (level * level + 6 * level) / 2,
+        16..=30 => ((2.5 * f64::from(level * level)) - (40.5 * f64::from(level)) + 360.0) as i32,
+        _ => ((4.5 * f64::from(level * level)) - (162.5 * f64::from(level)) + 2220.0) as i32,
+    }
+}
+
+/// Calculate level and points from total points
+pub fn total_to_level_and_points(total_points: i32) -> (i32, i32) {
+    let level = match total_points {
+        0..=352 => ((total_points as f64 + 9.0).sqrt() - 3.0) as i32,
+        353..=1507 => (81.0 + (total_points as f64 - 7839.0) / 40.0).sqrt() as i32,
+        _ => (325.0 + (total_points as f64 - 54215.0) / 72.0).sqrt() as i32,
+    };
+
+    let level_start = points_to_level(level);
+    let points_into_level = total_points - level_start;
+
+    (level, points_into_level)
+}
+
+/// Calculate progress (0.0 to 1.0) from points within a level
+pub fn progress_in_level(points: i32, level: i32) -> f32 {
+    let max_points = points_in_level(level);
+    #[allow(clippy::cast_precision_loss)]
+    let progress = (points as f32) / (max_points as f32);
+    progress.clamp(0.0, 1.0)
+}

pumpkin-util/src/math/mod.rs

@@ -1,6 +1,7 @@
 use num_traits::PrimInt;
 
 pub mod boundingbox;
+pub mod experience;
 pub mod position;
 pub mod vector2;
 pub mod vector3;