turtle-lib/examples/cartesian_axes.rs

@@ -1,114 +0,0 @@
-//! Cartesian coordinate system example
-//!
-//! This example draws a cartesian coordinate system with X and Y axes,
-//! labeled axis endpoints, and 4 labeled points (one in each quadrant).
-
-use macroquad::prelude::*;
-use turtle_lib::*;
-
-#[turtle_main("Cartesian Axes")]
-fn draw(turtle: &mut TurtlePlan) {
-    const AXIS_LENGTH: f32 = 250.0;
-    const GRID_STEP: f32 = 50.0;
-    const FONT_SIZE: i32 = 16;
-    const SMALL_FONT: i32 = 24;
-
-    // Draw coordinate system center and axes
-    turtle
-        .reset()
-        .set_speed(1100)
-        .pen_up()
-        .go_to(vec2(0.0, 0.0))
-        .pen_down();
-
-    // Draw X axis (horizontal)
-    turtle.set_pen_color(macroquad::prelude::BLACK);
-    turtle.set_pen_width(2.0);
-    turtle.pen_up().go_to(vec2(-AXIS_LENGTH, 0.0)).pen_down();
-    turtle.forward(2.0 * AXIS_LENGTH);
-
-    // Draw Y axis (vertical)
-    turtle.pen_up().go_to(vec2(0.0, -AXIS_LENGTH)).pen_down();
-    turtle.set_heading(90.0);
-    turtle.forward(2.0 * AXIS_LENGTH);
-
-    // Draw axis tick marks (major and minor)
-    turtle.set_pen_width(1.0);
-    const MINOR_STEP: f32 = GRID_STEP / 10.0; // 1/10th markers
-
-    let mut pos = -AXIS_LENGTH;
-    while pos <= AXIS_LENGTH {
-        if (pos - 0.0).abs() > 1.0 {
-            // Skip origin
-            // Determine if this is a major or minor tick
-            let is_major = (pos / GRID_STEP).abs().fract() < 0.01;
-            let tick_length = if is_major { 10.0 } else { 5.0 };
-
-            // X axis tick
-            turtle
-                .pen_up()
-                .set_pen_width(tick_length / 5.0)
-                .go_to(vec2(pos, -tick_length / 2.0))
-                .pen_down()
-                .set_heading(90.0)
-                .forward(tick_length);
-
-            // Y axis tick
-            turtle
-                .pen_up()
-                .go_to(vec2(-tick_length / 2.0, pos))
-                .set_pen_width(tick_length / 5.0)
-                .pen_down()
-                .set_heading(0.0)
-                .forward(tick_length);
-        }
-        pos += MINOR_STEP;
-    }
-
-    // Label axes
-    turtle
-        .pen_up()
-        .go_to(vec2(AXIS_LENGTH + 20.0, 0.0))
-        .set_heading(0.0)
-        .write_text("X", FONT_SIZE);
-
-    turtle
-        .pen_up()
-        .go_to(vec2(0.0, AXIS_LENGTH + 20.0))
-        .set_heading(0.0)
-        .write_text("Y", FONT_SIZE);
-
-    // Draw and label 4 points (one per quadrant)
-    let points = vec![
-        (vec2(120.0, 100.0), "A(2|1)"),
-        (vec2(-120.0, 100.0), "B(-2|1)"),
-        (vec2(-120.0, -100.0), "C(-2|-1)"),
-        (vec2(120.0, -100.0), "D(2|-1)"),
-    ];
-
-    for (position, label) in points {
-        // Draw point as small circle
-        turtle
-            .pen_up()
-            .go_to(position)
-            .set_pen_color(macroquad::prelude::RED)
-            .set_pen_width(7.0)
-            .pen_down()
-            .forward(1.0); // Just a small mark
-
-        // Add label
-        let label_offset = vec2(label.len() as f32 * 2.5, 0.0);
-        turtle
-            .pen_up()
-            .go_to(position - label_offset)
-            .set_heading(0.0)
-            .write_text(label, SMALL_FONT);
-    }
-
-    // Label origin
-    turtle
-        .pen_up()
-        .go_to(vec2(-30.0, -20.0))
-        .set_heading(0.0)
-        .write_text("O", FONT_SIZE);
-}

turtle-lib/examples/cheese.rs

@@ -35,7 +35,7 @@ async fn main() {
 
     // Draw triangular hole in the middle
     println!("Drawing triangular hole...");
-    turtle.go_to(vec2(200.0, -120.0));
+    turtle.go_to(vec2(200.0, 120.0));
     turtle.pen_down(); // Start new contour for hole
 
     for _ in 0..3 {
@@ -48,7 +48,7 @@ async fn main() {
 
     // Draw circular hole (top-left) using circle_left
     println!("Drawing circular hole (top-left) with circle_left...");
-    turtle.go_to(vec2(100.0, -100.0));
+    turtle.go_to(vec2(100.0, 100.0));
     turtle.pen_down(); // Start new contour for hole
     turtle.circle_left(30.0, 360.0, 36); // radius=30, full circle, 36 steps
     println!("Closing circle contour with pen_up");
@@ -56,7 +56,7 @@ async fn main() {
 
     // Draw circular hole (bottom-right) using circle_right
     println!("Drawing circular hole (bottom-right) with circle_right...");
-    turtle.go_to(vec2(280.0, -280.0));
+    turtle.go_to(vec2(280.0, 280.0));
     turtle.pen_down(); // Start new contour for hole
     turtle.circle_right(40.0, 360.0, 36); // radius=40, full circle, 36 steps
     println!("Closing circle contour with pen_up");

turtle-lib/examples/cheese_macro.rs

@@ -28,7 +28,7 @@ fn draw_cheese(turtle: &mut TurtlePlan) {
 
     // Draw triangular hole in the middle
     println!("Drawing triangular hole...");
-    turtle.go_to(vec2(200.0, -120.0));
+    turtle.go_to(vec2(200.0, 120.0));
     turtle.pen_down(); // Start new contour for hole
 
     for _ in 0..3 {
@@ -41,7 +41,7 @@ fn draw_cheese(turtle: &mut TurtlePlan) {
 
     // Draw circular hole (top-left) using circle_left
     println!("Drawing circular hole (top-left) with circle_left...");
-    turtle.go_to(vec2(100.0, -100.0));
+    turtle.go_to(vec2(100.0, 100.0));
     turtle.pen_down(); // Start new contour for hole
     turtle.circle_left(30.0, 360.0, 36); // radius=30, full circle, 36 steps
     println!("Closing circle contour with pen_up");
@@ -49,7 +49,7 @@ fn draw_cheese(turtle: &mut TurtlePlan) {
 
     // Draw circular hole (bottom-right) using circle_right
     println!("Drawing circular hole (bottom-right) with circle_right...");
-    turtle.go_to(vec2(280.0, -280.0));
+    turtle.go_to(vec2(280.0, 280.0));
     turtle.pen_down(); // Start new contour for hole
     turtle.circle_right(40.0, 360.0, 36); // radius=40, full circle, 36 steps
     println!("Closing circle contour with pen_up");

turtle-lib/examples/hangman_threaded.rs

@@ -83,6 +83,8 @@ fn run_game_logic(
         smiley_tx.send(plan.build()).ok();
     }
 
+    draw_smiley(&smiley_tx, true);
+
     // Setup: Position hangman turtle and draw base (hill)
     {
         let mut plan = create_turtle_plan();

turtle-lib/examples/sierpinski_triangle.rs

@@ -90,7 +90,7 @@ fn sierpinski_triangle_auto(turtle: &mut TurtlePlan, level: u8) {
     let size = TRIANGLE_SIZE;
 
     turtle.pen_up();
-    turtle.go_to((-screen_width() / 2.0 + 20.0, -screen_height() / 2.0 + 20.0));
+    turtle.go_to((-screen_width() / 2.0 + 20.0, screen_height() / 2.0 - 20.0));
     turtle.set_heading(0.0); // 0 = East (pointing right)
 
     // The drawing itself.

turtle-lib/src/builders.rs

@@ -615,7 +615,7 @@ impl TurtlePlan {
     /// Coordinates are in screen space:
     /// - `(0, 0)` is at the center
     /// - Positive x goes right
-    /// - Positive y goes up
+    /// - Positive y goes down
     ///
     /// # Examples
     ///

turtle-lib/src/execution.rs

@@ -247,8 +247,7 @@ pub fn execute_command(command: &TurtleCommand, state: &mut Turtle) {
 
         TurtleCommand::Goto(coord) => {
             let start = state.params.position;
-            // Flip Y coordinate: turtle graphics uses Y+ = up, but Macroquad uses Y+ = down
+            state.params.position = *coord;
-            state.params.position = vec2(coord.x, -coord.y);
 
             if state.params.pen_down {
                 // Draw line segment with round caps

turtle-lib/src/tweening.rs

@@ -400,8 +400,7 @@ impl TweenController {
                 });
             }
             TurtleCommand::Goto(coord) => {
-                // Flip Y coordinate: turtle graphics uses Y+ = up, but Macroquad uses Y+ = down
+                target.position = *coord;
-                target.position = vec2(coord.x, -coord.y);
             }
             TurtleCommand::SetHeading(heading) => {
                 target.heading = normalize_angle(*heading);