reduce exposed internal functions and fields

turtle-lib/src/circle_geometry.rs

@@ -10,11 +10,11 @@ pub enum CircleDirection {
 }
 
 /// Encapsulates all geometry for a circular arc
-pub struct CircleGeometry {
-    pub center: Vec2,
-    pub radius: f32,
-    pub start_angle_from_center: f32, // radians
-    pub direction: CircleDirection,
+pub(crate) struct CircleGeometry {
+    pub(crate) center: Vec2,
+    pub(crate) radius: f32,
+    pub(crate) start_angle_from_center: f32, // radians
+    pub(crate) direction: CircleDirection,
 }
 
 impl CircleGeometry {

turtle-lib/src/commands_channel.rs

@@ -76,7 +76,7 @@ pub struct TurtleCommandSender {
 ///
 /// Paired with `TurtleCommandSender` via `turtle_command_channel()`.
 /// Automatically managed by `TurtleApp::process_commands()`.
-pub struct TurtleCommandReceiver {
+pub(crate) struct TurtleCommandReceiver {
     turtle_id: usize,
     rx: Receiver<CommandQueue>,
 }
@@ -212,7 +212,7 @@ impl TurtleCommandReceiver {
 /// # }
 /// ```
 #[must_use]
-pub fn turtle_command_channel(
+pub(crate) fn turtle_command_channel(
     turtle_id: usize,
     buffer_size: usize,
 ) -> (TurtleCommandSender, TurtleCommandReceiver) {

turtle-lib/src/drawing.rs

@@ -13,7 +13,7 @@ use macroquad::prelude::*;
 use tween::CubicInOut;
 
 /// Render the entire turtle world
-pub fn render_world(world: &TurtleWorld) {
+pub(crate) fn render_world(world: &TurtleWorld) {
     // Update camera zoom based on current screen size to prevent stretching
     let camera = Camera2D {
         zoom: vec2(1.0 / screen_width() * 2.0, 1.0 / screen_height() * 2.0),
@@ -61,7 +61,7 @@ pub fn render_world(world: &TurtleWorld) {
 
 /// Render the turtle world with active tween visualization
 #[allow(clippy::too_many_lines)]
-pub fn render_world_with_tweens(world: &TurtleWorld, zoom_level: f32) {
+pub(crate) fn render_world_with_tweens(world: &TurtleWorld, zoom_level: f32) {
     // Update camera zoom based on current screen size to prevent stretching
     // Apply user zoom level by dividing by it (smaller zoom value = more zoomed in)
     let camera = Camera2D {
@@ -386,7 +386,7 @@ fn draw_tween_arc(
 }
 
 /// Draw the turtle shape
-pub fn draw_turtle(turtle_params: &TurtleParams) {
+pub(crate) fn draw_turtle(turtle_params: &TurtleParams) {
     let rotated_vertices = turtle_params.shape.rotated_vertices(turtle_params.heading);
 
     if turtle_params.shape.filled {

turtle-lib/src/execution.rs

@@ -12,7 +12,7 @@ use crate::general::AnimationSpeed;
 /// Execute side effects for commands that don't involve movement
 /// Returns true if the command was handled (caller should skip movement processing)
 #[allow(clippy::too_many_lines)]
-pub fn execute_command_side_effects(command: &TurtleCommand, state: &mut Turtle) -> bool {
+pub(crate) fn execute_command_side_effects(command: &TurtleCommand, state: &mut Turtle) -> bool {
     match command {
         TurtleCommand::BeginFill => {
             if state.filling.is_some() {
@@ -159,7 +159,7 @@ pub fn execute_command_side_effects(command: &TurtleCommand, state: &mut Turtle)
 
 /// Record fill vertices after movement commands have updated state
 #[tracing::instrument]
-pub fn record_fill_vertices_after_movement(
+pub(crate) fn record_fill_vertices_after_movement(
     command: &TurtleCommand,
     start_state: &TurtleParams,
     state: &mut Turtle,
@@ -200,7 +200,7 @@ pub fn record_fill_vertices_after_movement(
 /// Execute a single turtle command, updating state and adding draw commands
 #[tracing::instrument]
 #[allow(clippy::too_many_lines)]
-pub fn execute_command(command: &TurtleCommand, state: &mut Turtle) {
+pub(crate) fn execute_command(command: &TurtleCommand, state: &mut Turtle) {
     // Try to execute as side-effect-only command first
     if execute_command_side_effects(command, state) {
         return; // Command fully handled
@@ -346,7 +346,11 @@ pub fn execute_command(command: &TurtleCommand, state: &mut Turtle) {
 }
 
 /// Execute command on a specific turtle by ID
-pub fn execute_command_with_id(command: &TurtleCommand, turtle_id: usize, world: &mut TurtleWorld) {
+pub(crate) fn execute_command_with_id(
+    command: &TurtleCommand,
+    turtle_id: usize,
+    world: &mut TurtleWorld,
+) {
     // Clone turtle state to avoid borrow checker issues
     if let Some(turtle) = world.get_turtle(turtle_id) {
         let mut state = turtle.clone();
@@ -359,7 +363,7 @@ pub fn execute_command_with_id(command: &TurtleCommand, turtle_id: usize, world:
 }
 
 /// Add drawing command for a completed tween
-pub fn add_draw_for_completed_tween(
+pub(crate) fn add_draw_for_completed_tween(
     command: &TurtleCommand,
     start_state: &TurtleParams,
     end_state: &mut TurtleParams,

turtle-lib/src/export.rs

@@ -17,7 +17,7 @@ pub enum DrawingFormat {
     // Weitere Formate wie Png, Pdf, ...
 }
 
-pub trait DrawingExporter {
+pub(crate) trait DrawingExporter {
     /// Export the drawing to the specified format and filename
     ///
     /// # Errors
@@ -26,7 +26,7 @@ pub trait DrawingExporter {
     fn export(&self, world: &TurtleWorld, filename: &str) -> Result<(), ExportError>;
 }
 
-pub fn parse_svg_export_arg() -> Option<String> {
+pub(crate) fn parse_svg_export_arg() -> Option<String> {
     let args: Vec<String> = std::env::args().collect();
     let mut i = 1;
     while i < args.len() {

turtle-lib/src/lib.rs

@@ -46,30 +46,28 @@
 //! }
 //! ```
 
-pub mod builders;
-pub mod circle_geometry;
-pub mod commands;
-pub mod commands_channel;
-pub mod drawing;
-pub mod execution;
-pub mod general;
-pub mod shapes;
-pub mod state;
-pub mod tessellation;
-pub mod tweening;
+pub(crate) mod builders;
+pub(crate) mod circle_geometry;
+pub(crate) mod commands;
+pub(crate) mod commands_channel;
+pub(crate) mod drawing;
+pub(crate) mod execution;
+pub(crate) mod general;
+pub(crate) mod shapes;
+pub(crate) mod state;
+pub(crate) mod tessellation;
+pub(crate) mod tweening;
 
 // Re-export commonly used types
 pub use builders::{CurvedMovement, DirectionalMovement, Turnable, TurtlePlan, WithCommands};
 pub use commands::{CommandQueue, TurtleCommand};
-pub use commands_channel::{turtle_command_channel, TurtleCommandReceiver, TurtleCommandSender};
+pub use commands_channel::TurtleCommandSender;
 pub use general::{Angle, AnimationSpeed, Color, Coordinate, Length, Precision};
 pub use shapes::{ShapeType, TurtleShape};
-pub use state::{DrawCommand, Turtle, TurtleWorld};
-pub use tweening::TweenController;
 
 pub mod export;
 #[cfg(feature = "svg")]
-pub mod export_svg;
+pub(crate) mod export_svg;
 
 // Re-export the turtle_main macro
 pub use turtle_lib_macros::turtle_main;
@@ -79,6 +77,9 @@ pub use macroquad::prelude::{
     vec2, BLACK, BLUE, DARKGRAY, GOLD, GREEN, ORANGE, PURPLE, RED, WHITE, YELLOW,
 };
 
+use crate::commands_channel::TurtleCommandReceiver;
+use crate::state::TurtleWorld;
+use crate::tweening::TweenController;
 use macroquad::prelude::*;
 use std::collections::HashMap;
 
@@ -386,12 +387,12 @@ impl TurtleApp {
 
     /// Get reference to the world state
     #[must_use]
-    pub fn world(&self) -> &TurtleWorld {
+    pub(crate) fn world(&self) -> &TurtleWorld {
         &self.world
     }
 
     /// Get mutable reference to the world state
-    pub fn world_mut(&mut self) -> &mut TurtleWorld {
+    pub(crate) fn world_mut(&mut self) -> &mut TurtleWorld {
         &mut self.world
     }
 }

turtle-lib/src/state.rs

@@ -8,33 +8,33 @@ use macroquad::prelude::*;
 
 /// State during active fill operation
 #[derive(Clone, Debug)]
-pub struct FillState {
+pub(crate) struct FillState {
     /// Starting position of the fill
-    pub start_position: Coordinate,
+    pub(crate) start_position: Coordinate,
 
     /// All contours collected so far. Each contour is a separate closed path.
     /// The first contour is the outer boundary, subsequent contours are holes.
-    pub contours: Vec<Vec<Coordinate>>,
+    pub(crate) contours: Vec<Vec<Coordinate>>,
 
     /// Current contour being built (vertices for the active `pen_down` segment)
-    pub current_contour: Vec<Coordinate>,
+    pub(crate) current_contour: Vec<Coordinate>,
 
     /// Fill color (cached from when `begin_fill` was called)
-    pub fill_color: Color,
+    pub(crate) fill_color: Color,
 }
 
 /// Parameters that define a turtle's visual state
 #[derive(Clone, Debug)]
-pub struct TurtleParams {
-    pub position: Vec2,
-    pub heading: f32,
-    pub pen_down: bool,
-    pub pen_width: f32,
-    pub color: Color,
-    pub fill_color: Option<Color>,
-    pub visible: bool,
-    pub shape: crate::shapes::TurtleShape,
-    pub speed: AnimationSpeed,
+pub(crate) struct TurtleParams {
+    pub(crate) position: Vec2,
+    pub(crate) heading: f32,
+    pub(crate) pen_down: bool,
+    pub(crate) pen_width: f32,
+    pub(crate) color: Color,
+    pub(crate) fill_color: Option<Color>,
+    pub(crate) visible: bool,
+    pub(crate) shape: crate::shapes::TurtleShape,
+    pub(crate) speed: AnimationSpeed,
 }
 
 impl Default for TurtleParams {
@@ -56,18 +56,18 @@ impl Default for TurtleParams {
 
 /// State of a single turtle
 #[derive(Clone, Debug)]
-pub struct Turtle {
-    pub turtle_id: usize,
-    pub params: TurtleParams,
+pub(crate) struct Turtle {
+    pub(crate) turtle_id: usize,
+    pub(crate) params: TurtleParams,
 
     // Fill tracking
-    pub filling: Option<FillState>,
+    pub(crate) filling: Option<FillState>,
 
     // Drawing commands created by this turtle
-    pub commands: Vec<DrawCommand>,
+    pub(crate) commands: Vec<DrawCommand>,
 
     // Animation controller for this turtle
-    pub tween_controller: TweenController,
+    pub(crate) tween_controller: TweenController,
 }
 
 impl Default for Turtle {
@@ -259,9 +259,9 @@ impl Turtle {
 
 /// Cached mesh data that can be cloned and converted to Mesh when needed
 #[derive(Clone, Debug)]
-pub struct MeshData {
-    pub vertices: Vec<macroquad::prelude::Vertex>,
-    pub indices: Vec<u16>,
+pub(crate) struct MeshData {
+    pub(crate) vertices: Vec<macroquad::prelude::Vertex>,
+    pub(crate) indices: Vec<u16>,
 }
 
 impl MeshData {
@@ -278,19 +278,19 @@ impl MeshData {
 /// Drawable elements in the world
 /// All drawing is done via Lyon-tessellated meshes for consistency and quality
 #[derive(Clone, Debug)]
-pub struct TurtleSource {
-    pub command: crate::commands::TurtleCommand,
-    pub color: Color,
-    pub fill_color: Color,
-    pub pen_width: f32,
-    pub start_position: Vec2,
-    pub end_position: Vec2,
-    pub start_heading: f32,
-    pub contours: Option<Vec<Vec<crate::general::Coordinate>>>,
+pub(crate) struct TurtleSource {
+    pub(crate) command: crate::commands::TurtleCommand,
+    pub(crate) color: Color,
+    pub(crate) fill_color: Color,
+    pub(crate) pen_width: f32,
+    pub(crate) start_position: Vec2,
+    pub(crate) end_position: Vec2,
+    pub(crate) start_heading: f32,
+    pub(crate) contours: Option<Vec<Vec<crate::general::Coordinate>>>,
 }
 
 #[derive(Clone, Debug)]
-pub enum DrawCommand {
+pub(crate) enum DrawCommand {
     /// Pre-tessellated mesh data (lines, arcs, circles, polygons - all use this)
     Mesh {
         data: MeshData,
@@ -308,11 +308,11 @@ pub enum DrawCommand {
 }
 
 /// The complete turtle world containing all drawing state
-pub struct TurtleWorld {
+pub(crate) struct TurtleWorld {
     /// All turtles in the world (indexed by turtle ID)
-    pub turtles: Vec<Turtle>,
-    pub camera: Camera2D,
-    pub background_color: Color,
+    pub(crate) turtles: Vec<Turtle>,
+    pub(crate) camera: Camera2D,
+    pub(crate) background_color: Color,
 }
 
 impl TurtleWorld {

turtle-lib/src/tessellation.rs

@@ -14,26 +14,30 @@ use macroquad::prelude::*;
 
 /// Convert macroquad Vec2 to Lyon Point
 #[must_use]
-pub fn to_lyon_point(v: Vec2) -> Point {
+pub(crate) fn to_lyon_point(v: Vec2) -> Point {
     point(v.x, v.y)
 }
 
 /// Convert Lyon Point to macroquad Vec2
 #[allow(dead_code)]
 #[must_use]
-pub fn to_macroquad_vec2(p: Point) -> Vec2 {
+pub(crate) fn to_macroquad_vec2(p: Point) -> Vec2 {
     vec2(p.x, p.y)
 }
 
 /// Simple vertex type for Lyon tessellation
 #[derive(Copy, Clone, Debug)]
-pub struct SimpleVertex {
-    pub position: [f32; 2],
+pub(crate) struct SimpleVertex {
+    pub(crate) position: [f32; 2],
 }
 
 /// Build mesh data from Lyon tessellation
 #[must_use]
-pub fn build_mesh_data(vertices: &[SimpleVertex], indices: &[u16], color: Color) -> MeshData {
+pub(crate) fn build_mesh_data(
+    vertices: &[SimpleVertex],
+    indices: &[u16],
+    color: Color,
+) -> MeshData {
     let verts: Vec<Vertex> = vertices
         .iter()
         .map(|v| Vertex {
@@ -62,7 +66,7 @@ pub fn build_mesh_data(vertices: &[SimpleVertex], indices: &[u16], color: Color)
 /// # Errors
 ///
 /// Returns an error if no vertices are provided or if tessellation fails.
-pub fn tessellate_polygon(
+pub(crate) fn tessellate_polygon(
     vertices: &[Vec2],
     color: Color,
 ) -> Result<MeshData, Box<dyn std::error::Error>> {
@@ -107,7 +111,7 @@ pub fn tessellate_polygon(
 /// # Errors
 ///
 /// Returns an error if no contours are provided or if tessellation fails.
-pub fn tessellate_multi_contour(
+pub(crate) fn tessellate_multi_contour(
     contours: &[Vec<Vec2>],
     color: Color,
 ) -> Result<MeshData, Box<dyn std::error::Error>> {
@@ -203,7 +207,7 @@ pub fn tessellate_multi_contour(
 /// # Errors
 ///
 /// Returns an error if no vertices are provided or if tessellation fails.
-pub fn tessellate_stroke(
+pub(crate) fn tessellate_stroke(
     vertices: &[Vec2],
     color: Color,
     width: f32,
@@ -249,7 +253,7 @@ pub fn tessellate_stroke(
 /// # Errors
 ///
 /// Returns an error if tessellation fails.
-pub fn tessellate_circle(
+pub(crate) fn tessellate_circle(
     center: Vec2,
     radius: f32,
     color: Color,
@@ -295,7 +299,7 @@ pub fn tessellate_circle(
 ///
 /// Returns an error if tessellation fails.
 #[allow(clippy::too_many_arguments)]
-pub fn tessellate_arc(
+pub(crate) fn tessellate_arc(
     center: Vec2,
     radius: f32,
     start_angle_degrees: f32,

turtle-lib/src/tweening.rs

@@ -45,22 +45,22 @@ impl From<TweenVec2> for Vec2 {
 
 /// Controls tweening of turtle commands
 #[derive(Clone, Debug, Default)]
-pub struct TweenController {
+pub(crate) struct TweenController {
     queue: CommandQueue,
     current_tween: Option<CommandTween>,
     speed: AnimationSpeed,
 }
 
 #[derive(Clone, Debug)]
-pub struct CommandTween {
-    pub turtle_id: usize,
-    pub command: TurtleCommand,
-    pub start_time: f64,
-    pub duration: f64,
-    pub start_params: TurtleParams,
-    pub target_params: TurtleParams,
-    pub current_position: Vec2,
-    pub current_heading: f32,
+pub(crate) struct CommandTween {
+    pub(crate) turtle_id: usize,
+    pub(crate) command: TurtleCommand,
+    pub(crate) start_time: f64,
+    pub(crate) duration: f64,
+    pub(crate) start_params: TurtleParams,
+    pub(crate) target_params: TurtleParams,
+    pub(crate) current_position: Vec2,
+    pub(crate) current_heading: f32,
     position_tweener: Tweener<TweenVec2, f64, CubicInOut>,
     heading_tweener: Tweener<f32, f64, CubicInOut>,
     pen_width_tweener: Tweener<f32, f64, CubicInOut>,