From 468d2cba74b1cc7e25c6e55231e5da8f07388dca Mon Sep 17 00:00:00 2001
From: localhorst <localhorst@mosad.xyz>
Date: Tue, 6 Jan 2026 22:39:44 +0100
Subject: [PATCH] fix chase rgb animation

---
 main/animation.c | 52 +++++++++++++++++++++++++++++++++---------------
 1 file changed, 36 insertions(+), 16 deletions(-)

diff --git a/main/animation.c b/main/animation.c
index be05627..f96fa36 100644
--- a/main/animation.c
+++ b/main/animation.c
@@ -270,7 +270,7 @@ static void anim_chase(void)
             continue;
 
         // Calculate brightness based on distance from center
-        uint8_t brightness = (offset == 0) ? 255 : 64; // Center: full, trailing: 25%
+        uint8_t brightness = (offset == 0) ? 255 : 32; // Center: full, trailing: 12%
 
         // Create dimmed color
         rgb_t dimmed_red = {
@@ -299,26 +299,46 @@ static void anim_chase_rgb(void)
     // RGB cycling 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);
 
     hsv_t hsv = {global_hue, 255, 192};
     rgb_t color = led_hsv_to_rgb(hsv);
 
-    // 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 : 32; // Center: full, trailing: 12%
+
+        // Create dimmed color
+        rgb_t dimmed_color = {
+            (color.r * brightness) / 255,
+            (color.g * brightness) / 255,
+            (color.b * brightness) / 255};
+
+        // Map virtual position to physical LED
+        if (led_pos < num_leds_a)
         {
-            if (led_pos < led_get_num_leds_a())
-            {
-                led_add_pixel_a(led_pos, color);
-            }
-            else
-            {
-                led_add_pixel_b(led_pos - led_get_num_leds_a(), color);
-            }
+            // 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_color);
+        }
+        else
+        {
+            // Strip B (direct mapping)
+            uint16_t strip_b_index = led_pos - num_leds_a;
+            led_set_pixel_b(strip_b_index, dimmed_color);
         }
     }
 }
@@ -432,7 +452,7 @@ void animation_update(void)
         anim_chase();
         break;
     case ANIM_CHASE_RGB:
-        // anim_chase_rgb();
+        anim_chase_rgb();
         break;
     case ANIM_RANDOM:
         anim_random();