diff --git a/stackline/src/lib.rs b/stackline/src/lib.rs
index 805e154..ad8b438 100644
--- a/stackline/src/lib.rs
+++ b/stackline/src/lib.rs
@@ -39,7 +39,7 @@ pub mod prelude {
 
     pub use crate::text::{TextChar, TextSurface};
 
-    pub use crate::context::{UpdateContext, InitContext};
+    pub use crate::context::{InitContext, UpdateContext};
     pub use crate::signal::{Signal, Value};
     pub use crate::tile::Tile;
     pub use crate::utils::*;
diff --git a/stackline/tiles/transmit.rs b/stackline/tiles/transmit.rs
index 4acb822..28354ca 100644
--- a/stackline/tiles/transmit.rs
+++ b/stackline/tiles/transmit.rs
@@ -169,8 +169,38 @@ impl Tile for Sender {
     // TODO: read self.signals to determine the state of each char
     // TODO: automated test
     fn draw(&self, x: i32, y: i32, _state: State, surface: &mut TextSurface) {
+        let (x, y) = if self.path.len() > 0 {
+            (x - self.path[0].0, y - self.path[0].1)
+        } else {
+            (x, y)
+        };
+
+        let mut count = 0;
+
+        let mut get_state = || {
+            let mut found_exact = false;
+            let mut found_next = false;
+            for (_sig, n) in self.signals.iter() {
+                if *n == count {
+                    found_exact = true;
+                } else if *n == count + 1 {
+                    found_next = true;
+                }
+            }
+
+            count += 1;
+
+            if found_exact {
+                State::Active
+            } else if found_next {
+                State::Dormant
+            } else {
+                State::Idle
+            }
+        };
+
         for (prev, next) in self.path.iter().zip(self.path.iter().skip(1)) {
-            if prev.0 != next.0 {
+            let (line_char, dx, dy) = if prev.0 != next.0 {
                 // Draw the diode of the corner
                 let ch = if next.0 > prev.0 { '>' } else { '<' };
                 let x2 = x + prev.0;
@@ -180,22 +210,16 @@ impl Tile for Sender {
                     surface.set(
                         x2 as usize,
                         y2 as usize,
-                        TextChar::from_state(ch, State::Idle),
+                        TextChar::from_state(ch, get_state()),
                     );
                 }
 
-                // Draw the horizontal line
-
-                for dx in (prev.0 + 1)..(next.0) {
-                    let x2 = x + dx;
-                    let y2 = y + prev.1;
-                    if x2 >= 0 && y2 >= 0 {
-                        surface.set(
-                            x2 as usize,
-                            y2 as usize,
-                            TextChar::from_state('-', State::Idle),
-                        );
-                    }
+                // Draw an horizontal line
+
+                if prev.0 < next.0 {
+                    ('-', 1, 0)
+                } else {
+                    ('-', -1, 0)
                 }
             } else {
                 // Draw the diode of the corner
@@ -207,23 +231,40 @@ impl Tile for Sender {
                     surface.set(
                         x2 as usize,
                         y2 as usize,
-                        TextChar::from_state(ch, State::Idle),
+                        TextChar::from_state(ch, get_state()),
                     );
                 }
 
-                // Draw the vertical line
-
-                for dy in (prev.1 + 1)..(next.1) {
-                    let x2 = x + prev.0;
-                    let y2 = y + dy;
-                    if x2 >= 0 && y2 >= 0 {
-                        surface.set(
-                            x2 as usize,
-                            y2 as usize,
-                            TextChar::from_state('-', State::Idle),
-                        );
+                // Draw a vertical line
+
+                if prev.1 < next.1 {
+                    ('|', 0, 1)
+                } else {
+                    ('|', 0, -1)
+                }
+            };
+
+            // Draw the line
+            for (x2, y2) in std::iter::successors(
+                Some(*prev),
+                |&curr| {
+                    let res = (curr.0.checked_add(dx)?, curr.1.checked_add(dy)?);
+                    if res == *next {
+                        None
+                    } else {
+                        Some(res)
                     }
                 }
+            ).skip(1) {
+                let x2 = x + x2;
+                let y2 = y + y2;
+                if x2 >= 0 && y2 >= 0 {
+                    surface.set(
+                        x2 as usize,
+                        y2 as usize,
+                        TextChar::from_state(line_char, get_state()),
+                    );
+                }
             }
         }
     }