From d2d5d7dc4b450dde6c2043a3e3498ca99e29d680 Mon Sep 17 00:00:00 2001
From: localhorst <localhorst@mosad.xyz>
Date: Tue, 6 Jan 2026 22:33:28 +0100
Subject: [PATCH] fix chase animation

---
 main/animation.c | 50 +++++++++++++++++++++++++++++++++---------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/main/animation.c b/main/animation.c
index 1500ddf..be05627 100644
--- a/main/animation.c
+++ b/main/animation.c
@@ -251,25 +251,45 @@ static void anim_chase(void)
     // Red dot sweeping with trailing dots
     led_clear_all();
 
-    uint16_t num_leds = led_get_num_leds_a() + led_get_num_leds_b();
-    int16_t pos = beatsin16(40, 0, num_leds - 1);
+    uint16_t num_leds_a = led_get_num_leds_a();
+    uint16_t num_leds_b = led_get_num_leds_b();
+    uint16_t total_leds = num_leds_a + num_leds_b;
+
+    // Get oscillating position across both strips
+    int16_t center_pos = beatsin16(40, 0, total_leds - 1);
 
     rgb_t red = {255, 0, 0};
 
-    // Set main dot and trailing dots
-    for (int offset = -2; offset <= 2; offset++)
+    // Draw center dot with dimmed trailing dots (3 dots total: center ±1)
+    for (int8_t offset = -1; offset <= 1; offset++)
     {
-        int16_t led_pos = pos + offset;
-        if (led_pos >= 0 && led_pos < num_leds)
+        int16_t led_pos = center_pos + offset;
+
+        // Skip if position is out of bounds
+        if (led_pos < 0 || led_pos >= total_leds)
+            continue;
+
+        // Calculate brightness based on distance from center
+        uint8_t brightness = (offset == 0) ? 255 : 64; // Center: full, trailing: 25%
+
+        // Create dimmed color
+        rgb_t dimmed_red = {
+            (red.r * brightness) / 255,
+            (red.g * brightness) / 255,
+            (red.b * brightness) / 255};
+
+        // Map virtual position to physical LED
+        if (led_pos < num_leds_a)
         {
-            if (led_pos < led_get_num_leds_a())
-            {
-                led_set_pixel_a(led_pos, red);
-            }
-            else
-            {
-                led_set_pixel_b(led_pos - led_get_num_leds_a(), red);
-            }
+            // Strip A (mirrored: position 0 maps to last LED)
+            uint16_t strip_a_index = num_leds_a - led_pos - 1;
+            led_set_pixel_a(strip_a_index, dimmed_red);
+        }
+        else
+        {
+            // Strip B (direct mapping)
+            uint16_t strip_b_index = led_pos - num_leds_a;
+            led_set_pixel_b(strip_b_index, dimmed_red);
         }
     }
 }
@@ -409,7 +429,7 @@ void animation_update(void)
         anim_navigation();
         break;
     case ANIM_CHASE:
-        // anim_chase();
+        anim_chase();
         break;
     case ANIM_CHASE_RGB:
         // anim_chase_rgb();