From e14b3b44b0ef80fec8a5810cb21a1d3794607c60 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 16 Sep 2025 14:56:20 +0000
Subject: [PATCH] feat: Make tunnel movement gentle and intermittent

This commit modifies the tunnel screensaver to make the movement of the
tunnel's center much slower and gentler. It also introduces random
pauses (between 5 and 20 seconds) where the center of the tunnel
remains stationary.

A state machine has been implemented within the main loop to handle the
'moving' and 'paused' states, and the animation speed is now controlled
by a new `angle_increment` variable.
---
 gallery/tunnel/tunnel.sh | 52 ++++++++++++++++++++++++++++++++--------
 jury/tunnel.bats         |  4 ++--
 2 files changed, 44 insertions(+), 12 deletions(-)

diff --git a/gallery/tunnel/tunnel.sh b/gallery/tunnel/tunnel.sh
index a9f4438..87bd7d0 100755
--- a/gallery/tunnel/tunnel.sh
+++ b/gallery/tunnel/tunnel.sh
@@ -43,6 +43,16 @@ animate() {
     local frame_counter=0
     local frame_buffer=""
 
+    # --- New state variables for movement ---
+    local is_moving=0 # Start in a paused state
+    local next_state_change_time
+    next_state_change_time=$(date +%s)
+    local move_duration=10 # seconds
+    local min_pause_duration=5 # seconds
+    local max_pause_duration=20 # seconds
+    local angle_increment=0.005 # Slow down the movement
+
+
     # Plot a point, checking for screen boundaries
     plot_point() {
         local x=$1 y=$2 char=$3 color=$4
@@ -60,16 +70,38 @@ animate() {
     }
 
     while true; do
-        # --- Update center coordinates for a moving tunnel effect (more efficiently) ---
-        read -r angle center_x center_y < <(awk -v angle="$angle" \
-            -v center_x="$original_center_x" -v center_y="$original_center_y" \
-            -v offset_x="$center_offset_x" -v offset_y="$center_offset_y" \
-            'BEGIN {
-                angle += 0.05;
-                cx = int(center_x + offset_x * cos(angle));
-                cy = int(center_y + offset_y * sin(angle));
-                print angle, cx, cy;
-            }')
+        # --- State management for movement ---
+        local current_time
+        current_time=$(date +%s)
+        if (( current_time >= next_state_change_time )); then
+            if (( is_moving )); then
+                # Transition to paused state
+                is_moving=0
+                local pause_duration=$((RANDOM % (max_pause_duration - min_pause_duration + 1) + min_pause_duration))
+                next_state_change_time=$((current_time + pause_duration))
+            else
+                # Transition to moving state
+                is_moving=1
+                next_state_change_time=$((current_time + move_duration))
+            fi
+        fi
+
+        # --- Update center coordinates only when moving ---
+        if (( is_moving )); then
+            # When moving, the center of the tunnel is continuously recalculated
+            # to create the illusion of flying through a turning tunnel.
+            read -r angle center_x center_y < <(awk -v angle="$angle" \
+                -v center_x="$original_center_x" -v center_y="$original_center_y" \
+                -v offset_x="$center_offset_x" -v offset_y="$center_offset_y" \
+                -v angle_increment="$angle_increment" \
+                'BEGIN {
+                    angle += angle_increment;
+                    cx = int(center_x + offset_x * cos(angle));
+                    cy = int(center_y + offset_y * sin(angle));
+                    print angle, cx, cy;
+                }')
+        fi
+
 
         frame_buffer=""
         # Add a new ribbon every few frames
diff --git a/jury/tunnel.bats b/jury/tunnel.bats
index c9d7ee7..a9ac480 100755
--- a/jury/tunnel.bats
+++ b/jury/tunnel.bats
@@ -1,7 +1,7 @@
 #!/usr/bin/env bats
 
-load 'jury/test_libs/bats-support-0.3.0/load.bash'
-load 'jury/test_libs/bats-assert-2.2.0/load.bash'
+load 'test_libs/bats-support-0.3.0/load.bash'
+load 'test_libs/bats-assert-2.2.0/load.bash'
 
 SCRIPT="gallery/tunnel/tunnel.sh"