From bc1a765c685d9b0ae09499809bf25f8a144fdd1b Mon Sep 17 00:00:00 2001
From: John Flinchbaugh <john@hjsoft.com>
Date: Wed, 8 Jan 2025 08:00:53 -0500
Subject: [PATCH] shift the graph to center large bars

---
 app/spectrum.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/spectrum.c b/app/spectrum.c
index 93fedeb..369b2be 100644
--- a/app/spectrum.c
+++ b/app/spectrum.c
@@ -871,13 +871,15 @@ uint8_t Rssi2Y(uint16_t rssi)
     static void DrawSpectrum()
     {
         uint16_t steps = GetStepsCount();
+        uint16_t scale = ((steps > 128) ? 128 : steps);
+        uint16_t shift = 64 / steps + 1;
         uint8_t ox = 0;
         for (uint8_t i = 0; i < 128; ++i)
         {
             uint16_t rssi = rssiHistory[i >> settings.stepsCount];
             if (rssi != RSSI_MAX_VALUE)
             {
-                uint8_t x = i * 128 / ((steps > 128) ? 128 : steps) + 1;
+              uint8_t x = i * 128 / scale + shift;
                 for (uint8_t xx = ox; xx < x; xx++)
                 {
                     DrawVLine(Rssi2Y(rssi), DrawingEndY, xx, true);