674 lines
20 KiB
Rust
674 lines
20 KiB
Rust
//! Builder pattern traits for creating turtle command sequences
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use crate::commands::{CommandQueue, TurtleCommand};
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use crate::general::{AnimationSpeed, Color, Coordinate, Precision};
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use crate::shapes::{ShapeType, TurtleShape};
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/// Trait for adding commands to a queue
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pub trait WithCommands {
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fn get_commands_mut(&mut self) -> &mut CommandQueue;
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fn get_commands(self) -> CommandQueue;
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}
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/// Trait for forward/backward movement
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pub trait DirectionalMovement: WithCommands {
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/// Moves the turtle forward by the specified distance.
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///
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/// The turtle moves in the direction of its current heading.
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/// If the pen is down, a line is drawn.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Forward Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Move forward 100 pixels
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/// turtle.forward(100.0);
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///
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/// // Chain movements
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/// turtle.forward(50.0).right(90.0).forward(50.0);
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/// }
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/// ```
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fn forward<T>(&mut self, distance: T) -> &mut Self
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where
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T: Into<Precision>,
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{
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let dist: Precision = distance.into();
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self.get_commands_mut().push(TurtleCommand::Move(dist));
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self
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}
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/// Moves the turtle backward by the specified distance.
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///
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/// The turtle moves opposite to its current heading without changing
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/// the heading direction. If the pen is down, a line is drawn.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Backward Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Move backward 100 pixels
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/// turtle.backward(100.0);
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///
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/// // Draw a line forward, then retrace backward
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/// turtle.forward(100.0).backward(50.0);
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/// }
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/// ```
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fn backward<T>(&mut self, distance: T) -> &mut Self
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where
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T: Into<Precision>,
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{
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let dist: Precision = distance.into();
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self.get_commands_mut().push(TurtleCommand::Move(-dist));
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self
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}
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}
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/// Trait for turning operations
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pub trait Turnable: WithCommands {
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/// Turns the turtle left (counter-clockwise) by the specified angle in degrees.
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///
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/// Changes the turtle's heading without moving its position.
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/// Does not draw anything.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Left Turn Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Draw a square using left turns
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/// for _ in 0..4 {
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/// turtle.forward(100.0).left(90.0);
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/// }
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/// }
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/// ```
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fn left<T>(&mut self, angle: T) -> &mut Self
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where
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T: Into<Precision>,
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{
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let degrees: Precision = angle.into();
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self.get_commands_mut().push(TurtleCommand::Turn(-degrees));
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self
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}
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/// Turns the turtle right (clockwise) by the specified angle in degrees.
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///
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/// Changes the turtle's heading without moving its position.
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/// Does not draw anything.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Right Turn Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Draw a triangle using right turns
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/// for _ in 0..3 {
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/// turtle.forward(100.0).right(120.0);
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/// }
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/// }
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/// ```
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fn right<T>(&mut self, angle: T) -> &mut Self
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where
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T: Into<Precision>,
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{
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let degrees: Precision = angle.into();
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self.get_commands_mut().push(TurtleCommand::Turn(degrees));
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self
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}
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}
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/// Trait for curved movement (circles)
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pub trait CurvedMovement: WithCommands {
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/// Draws a circular arc turning to the left (counter-clockwise).
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///
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/// The turtle draws a circular arc with the specified radius, sweeping through
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/// the given angle. The circle center is positioned to the left of the turtle.
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///
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/// # Parameters
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///
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/// - `radius`: Distance from turtle to circle center (in pixels)
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/// - `angle`: Arc sweep angle in degrees (360° = full circle)
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/// - `steps`: Number of line segments to approximate the arc (more = smoother)
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Circle Left Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Draw a full circle
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/// turtle.circle_left(50.0, 360.0, 36);
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///
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/// // Filled circle
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/// turtle.pen_up().go_to(vec2(100.0, 0.0)).pen_down();
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/// turtle.set_fill_color(RED)
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/// .begin_fill()
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/// .circle_left(50.0, 360.0, 72)
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/// .end_fill();
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/// }
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/// ```
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fn circle_left<R, A>(&mut self, radius: R, angle: A, steps: usize) -> &mut Self
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where
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R: Into<Precision>,
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A: Into<Precision>,
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{
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let r: Precision = radius.into();
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let a: Precision = angle.into();
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self.get_commands_mut().push(TurtleCommand::Circle {
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radius: r,
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angle: a,
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steps,
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direction: crate::circle_geometry::CircleDirection::Left,
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});
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self
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}
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/// Draws a circular arc turning to the right (clockwise).
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///
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/// The turtle draws a circular arc with the specified radius, sweeping through
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/// the given angle. The circle center is positioned to the right of the turtle.
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///
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/// # Parameters
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///
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/// - `radius`: Distance from turtle to circle center (in pixels)
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/// - `angle`: Arc sweep angle in degrees (360° = full circle)
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/// - `steps`: Number of line segments to approximate the arc (more = smoother)
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Circle Right Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Draw an S-curve using both directions
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/// turtle.circle_left(50.0, 180.0, 36)
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/// .circle_right(50.0, 180.0, 36);
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///
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/// // Yin-yang pattern uses circle_left and circle_right
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/// turtle.set_fill_color(BLACK)
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/// .begin_fill()
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/// .circle_right(100.0, 180.0, 36)
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/// .circle_right(50.0, 180.0, 36)
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/// .circle_left(50.0, 180.0, 36)
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/// .end_fill();
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/// }
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/// ```
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fn circle_right<R, A>(&mut self, radius: R, angle: A, steps: usize) -> &mut Self
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where
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R: Into<Precision>,
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A: Into<Precision>,
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{
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let r: Precision = radius.into();
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let a: Precision = angle.into();
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self.get_commands_mut().push(TurtleCommand::Circle {
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radius: r,
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angle: a,
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steps,
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direction: crate::circle_geometry::CircleDirection::Right,
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});
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self
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}
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}
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/// Builder for creating turtle command sequences
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#[derive(Default, Debug)]
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pub struct TurtlePlan {
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queue: CommandQueue,
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}
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impl TurtlePlan {
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/// Creates a new empty turtle command plan.
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///
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/// This has to be used when not using the `turtle_main` macro.
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///
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/// # Examples
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///
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/// ```no_run
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/// use turtle_lib::*;
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/// use macroquad::prelude::*;
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///
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/// #[macroquad::main("Manual Setup")]
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/// async fn main() {
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/// let mut turtle = TurtlePlan::new();
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/// turtle.forward(100.0).right(90.0).forward(100.0);
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///
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/// let mut app = TurtleApp::new().with_commands(turtle.build());
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///
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/// loop {
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/// clear_background(WHITE);
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/// app.update();
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/// app.render();
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///
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/// if is_key_pressed(KeyCode::Escape) || is_key_pressed(KeyCode::Q) {
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/// break;
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/// }
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/// next_frame().await;
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/// }
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/// }
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/// ```
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#[must_use]
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pub fn new() -> Self {
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Self {
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queue: CommandQueue::new(),
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}
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}
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/// Sets the animation speed for turtle movements.
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///
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/// Speed controls how fast the turtle moves during animations:
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/// - Values `>= 1000`: Instant mode - commands execute immediately without animation.
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/// The bigger the number, the more segments are drawn per frame.
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/// - Values `< 1000`: Animated mode - turtle moves at specified pixels per second
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///
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/// You can dynamically switch between instant and animated modes during execution.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Speed Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Slow animation at 50 pixels/second
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/// turtle.set_speed(50.0)
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/// .forward(100.0);
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///
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/// // Switch to instant mode
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/// turtle.set_speed(1000.0)
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/// .forward(100.0); // Executes immediately
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/// }
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/// ```
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pub fn set_speed(&mut self, speed: impl Into<AnimationSpeed>) -> &mut Self {
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self.queue.push(TurtleCommand::SetSpeed(speed.into()));
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self
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}
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/// Sets the pen color for drawing lines.
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///
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/// The pen color affects all subsequent drawing operations (forward, backward, circles)
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/// until changed again. Does not affect fill color.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Pen Color Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Draw with predefined colors
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/// turtle.set_pen_color(RED)
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/// .forward(100.0)
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/// .set_pen_color(BLUE)
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/// .right(90.0)
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/// .forward(100.0);
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/// }
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/// ```
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pub fn set_pen_color(&mut self, color: Color) -> &mut Self {
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self.queue.push(TurtleCommand::SetColor(color));
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self
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}
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/// Sets the pen width (thickness) for drawing lines.
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///
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/// The width is measured in pixels. Default is typically 2.0.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Pen Width Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Thin line
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/// turtle.set_pen_width(1.0)
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/// .forward(100.0);
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///
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/// // Thick line
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/// turtle.set_pen_width(10.0)
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/// .forward(100.0);
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/// }
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/// ```
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pub fn set_pen_width(&mut self, width: Precision) -> &mut Self {
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self.queue.push(TurtleCommand::SetPenWidth(width));
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self
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}
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/// Sets the turtle's absolute heading direction in degrees.
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///
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/// - `0°` points to the right (east)
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/// - `90°` points up (north)
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/// - `180°` points left (west)
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/// - `270°` points down (south)
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Heading Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Point upward
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/// turtle.set_heading(90.0)
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/// .forward(100.0);
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///
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/// // Point left
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/// turtle.set_heading(180.0)
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/// .forward(100.0);
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/// }
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/// ```
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pub fn set_heading(&mut self, heading: Precision) -> &mut Self {
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self.queue.push(TurtleCommand::SetHeading(heading));
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self
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}
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/// Lifts the pen up so the turtle can move without drawing.
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///
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/// When filling shapes, `pen_up()` also closes the current contour,
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/// allowing you to create multi-contour fills (e.g., shapes with holes).
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Pen Up/Down Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Move without drawing
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/// turtle.pen_up()
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/// .forward(100.0) // No line drawn
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/// .pen_down()
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/// .forward(100.0); // Line drawn
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///
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/// // Create a donut shape (outer circle with inner hole)
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/// turtle.set_fill_color(BLUE)
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/// .begin_fill()
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/// .circle_left(100.0, 360.0, 72) // Outer circle
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/// .pen_up() // Close first contour
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/// .go_to(vec2(0.0, -30.0))
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/// .pen_down() // Start second contour
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/// .circle_left(30.0, 360.0, 36) // Inner circle (becomes hole)
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/// .end_fill();
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/// }
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/// ```
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pub fn pen_up(&mut self) -> &mut Self {
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self.queue.push(TurtleCommand::PenUp);
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self
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}
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/// Lowers the pen so the turtle draws when moving.
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///
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/// This is the default state. When filling shapes, `pen_down()` starts
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/// a new contour after `pen_up()` was called.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Pen Down Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// turtle.pen_up()
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/// .forward(50.0) // Move without drawing
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/// .pen_down() // Start drawing
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/// .forward(100.0); // Line appears
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/// }
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/// ```
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pub fn pen_down(&mut self) -> &mut Self {
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self.queue.push(TurtleCommand::PenDown);
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self
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}
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/// Hides the turtle cursor from view.
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///
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/// The turtle will still execute commands and draw, but the cursor
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/// (typically an arrow or triangle) won't be visible.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Hide Turtle Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// turtle.hide() // Turtle cursor invisible
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/// .forward(100.0)
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/// .right(90.0)
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/// .forward(100.0);
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/// }
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/// ```
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pub fn hide(&mut self) -> &mut Self {
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self.queue.push(TurtleCommand::HideTurtle);
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self
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}
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/// Shows the turtle cursor.
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///
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/// Makes the turtle cursor visible if it was previously hidden.
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/// This is the default state.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Show Turtle Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// turtle.hide()
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/// .forward(100.0)
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/// .show() // Turtle becomes visible again
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/// .forward(100.0);
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/// }
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/// ```
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pub fn show(&mut self) -> &mut Self {
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self.queue.push(TurtleCommand::ShowTurtle);
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self
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}
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/// Sets the turtle's shape using a `TurtleShape` object.
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///
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/// For most use cases, prefer using `shape()` which accepts a `ShapeType` enum.
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///
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/// # Examples
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///
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/// ```
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Shape Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// let custom_shape = ShapeType::Arrow.to_shape();
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/// turtle.set_shape(custom_shape);
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/// }
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/// ```
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pub fn set_shape(&mut self, shape: TurtleShape) -> &mut Self {
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self.queue.push(TurtleCommand::SetShape(shape));
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self
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}
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/// Sets the turtle's visual appearance.
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///
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/// Available shapes: `Arrow`, `Triangle`, `Square`, `Circle`.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Shape Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Use different shapes
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/// turtle.shape(ShapeType::Arrow)
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/// .forward(50.0)
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/// .shape(ShapeType::Circle)
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/// .forward(50.0);
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/// }
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/// ```
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pub fn shape(&mut self, shape_type: ShapeType) -> &mut Self {
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self.set_shape(shape_type.to_shape())
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}
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/// Starts recording a shape to be filled.
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///
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/// All turtle movements between `begin_fill()` and `end_fill()` define
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/// the shape's outline. The shape is filled using the fill color when
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/// `end_fill()` is called.
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///
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/// Multiple contours can be created using `pen_up()` and `pen_down()`.
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/// The `EvenOdd` fill rule automatically creates holes for inner contours.
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///
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/// # Examples
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///
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/// ```no_run
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/// # use turtle_lib::*;
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/// #
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/// #[turtle_main("Fill Example")]
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/// fn draw(turtle: &mut TurtlePlan) {
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/// // Fill a square
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/// turtle.set_fill_color(BLUE)
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/// .begin_fill();
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/// for _ in 0..4 {
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/// turtle.forward(100.0).right(90.0);
|
|
/// }
|
|
/// turtle.end_fill();
|
|
///
|
|
/// // Fill a circle
|
|
/// turtle.pen_up().go_to(vec2(150.0, 0.0)).pen_down();
|
|
/// turtle.set_fill_color(RED)
|
|
/// .begin_fill()
|
|
/// .circle_left(50.0, 360.0, 36)
|
|
/// .end_fill();
|
|
/// }
|
|
/// ```
|
|
pub fn begin_fill(&mut self) -> &mut Self {
|
|
self.queue.push(TurtleCommand::BeginFill);
|
|
self
|
|
}
|
|
|
|
/// Completes the fill operation started with `begin_fill()`.
|
|
///
|
|
/// Closes the current shape and fills it with the fill color.
|
|
/// All contours recorded since `begin_fill()` are filled together.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```no_run
|
|
/// # use turtle_lib::*;
|
|
/// #
|
|
/// #[turtle_main("End Fill Example")]
|
|
/// fn draw(turtle: &mut TurtlePlan) {
|
|
/// // Triangle with fill
|
|
/// turtle.set_fill_color(GREEN)
|
|
/// .begin_fill();
|
|
/// for _ in 0..3 {
|
|
/// turtle.forward(100.0).right(120.0);
|
|
/// }
|
|
/// turtle.end_fill();
|
|
/// }
|
|
/// ```
|
|
pub fn end_fill(&mut self) -> &mut Self {
|
|
self.queue.push(TurtleCommand::EndFill);
|
|
self
|
|
}
|
|
|
|
/// Sets the color used to fill shapes.
|
|
///
|
|
/// This affects all shapes filled with `begin_fill()`/`end_fill()`.
|
|
/// Independent from the pen color used for outlines.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```no_run
|
|
/// # use turtle_lib::*;
|
|
/// #
|
|
/// #[turtle_main("Fill Color Example")]
|
|
/// fn draw(turtle: &mut TurtlePlan) {
|
|
/// // Yellow fill with blue outline
|
|
/// turtle.set_fill_color(YELLOW)
|
|
/// .set_pen_color(BLUE)
|
|
/// .begin_fill()
|
|
/// .circle_left(50.0, 360.0, 36)
|
|
/// .end_fill();
|
|
/// }
|
|
/// ```
|
|
pub fn set_fill_color(&mut self, color: impl Into<Color>) -> &mut Self {
|
|
self.queue
|
|
.push(TurtleCommand::SetFillColor(Some(color.into())));
|
|
self
|
|
}
|
|
|
|
/// Moves the turtle to an absolute position.
|
|
///
|
|
/// The turtle moves in a straight line to the specified coordinates.
|
|
/// If the pen is down, a line is drawn. The turtle's heading is not changed.
|
|
///
|
|
/// Coordinates are in screen space:
|
|
/// - `(0, 0)` is at the center
|
|
/// - Positive x goes right
|
|
/// - Positive y goes down
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```no_run
|
|
/// # use turtle_lib::*;
|
|
/// #
|
|
/// #[turtle_main("Goto Example")]
|
|
/// fn draw(turtle: &mut TurtlePlan) {
|
|
/// // Draw a triangle by connecting points
|
|
/// turtle.go_to(vec2(0.0, 0.0));
|
|
/// turtle.go_to(vec2(100.0, 0.0));
|
|
/// turtle.go_to(vec2(50.0, 86.6));
|
|
/// turtle.go_to(vec2(0.0, 0.0));
|
|
/// }
|
|
/// ```
|
|
pub fn go_to(&mut self, coord: impl Into<Coordinate>) -> &mut Self {
|
|
self.queue.push(TurtleCommand::Goto(coord.into()));
|
|
self
|
|
}
|
|
|
|
/// Consumes the `TurtlePlan` and returns the command queue.
|
|
///
|
|
/// Use this to finalize the turtle commands and pass them to `TurtleApp`.
|
|
/// This method consumes `self`, so the plan cannot be used afterward.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// # use turtle_lib::*;
|
|
/// #
|
|
/// let mut turtle = TurtlePlan::new();
|
|
/// turtle.forward(100.0).right(90.0).forward(100.0);
|
|
///
|
|
/// // Build and get the command queue
|
|
/// let commands = turtle.build();
|
|
/// # assert!(!commands.is_empty());
|
|
/// ```
|
|
#[must_use]
|
|
pub fn build(self) -> CommandQueue {
|
|
self.queue
|
|
}
|
|
}
|
|
|
|
impl WithCommands for TurtlePlan {
|
|
fn get_commands_mut(&mut self) -> &mut CommandQueue {
|
|
&mut self.queue
|
|
}
|
|
|
|
fn get_commands(self) -> CommandQueue {
|
|
self.queue
|
|
}
|
|
}
|
|
|
|
impl DirectionalMovement for TurtlePlan {}
|
|
impl Turnable for TurtlePlan {}
|
|
impl CurvedMovement for TurtlePlan {}
|