feat: make parameter icon flash synchronously with alarm in 4-quadrant and full-screen modes

sketch/obd2_gauge/meter.h

@@ -67,6 +67,21 @@ void drawPidIcon(int x, int y, const String &pidStr) {
   }
 }
 
+// Clear parameter icon for 4-quadrant view
+void clearPidIcon(int x, int y, const String &pidStr) {
+  if (pidStr == "0105") {
+    tft.fillRect(x, y, 38, 37, TFT_BLACK);
+  } else if (pidStr == "010D") {
+    tft.fillRect(x, y, 42, 43, TFT_BLACK);
+  } else if (pidStr == "010C") {
+    tft.fillRect(x, y, 42, 43, TFT_BLACK);
+  } else if (pidStr == "0142" || pidStr == "ATRV") {
+    tft.fillRect(x, y, 46, 35, TFT_BLACK);
+  } else {
+    tft.fillRect(x, y, 42, 42, TFT_BLACK);
+  }
+}
+
 // Draw header icon (42x42 px, ~30% larger) for full screen mode
 void drawPidIconHeader(int x, int y, const String &pidStr) {
   tft.setSwapBytes(true);
@@ -81,6 +96,36 @@ void drawPidIconHeader(int x, int y, const String &pidStr) {
   }
 }
 
+// Restore blue header background over the 42x42 icon area during alarm blink OFF phase
+void clearPidIconHeader(int x = 10, int y = 4, int w = 42, int h = 42) {
+  const float fade_w_left = 16.0f;
+  uint16_t lineBuf[64];
+  if (w > 64) w = 64;
+  tft.startWrite();
+  tft.setAddrWindow(x, y, w, h);
+  for (int16_t j = y; j < y + h; j++) {
+    float vy = 1.0f;
+    if (j >= 30) {
+      float t = (50.0f - (float)j) / 20.0f;
+      vy = t * t * (3.0f - 2.0f * t);
+    }
+    for (int16_t i = 0; i < w; i++) {
+      int16_t px = x + i;
+      float hx = 1.0f;
+      if (px < (int16_t)fade_w_left) {
+        float t = (float)px / fade_w_left;
+        hx = t * t * (3.0f - 2.0f * t);
+      }
+      float b = vy * hx;
+      uint8_t g = (uint8_t)(140.0f * b);
+      uint8_t bl = (uint8_t)(255.0f * b);
+      lineBuf[i] = tft.color565(0, g, bl);
+    }
+    tft.pushPixels(lineBuf, w);
+  }
+  tft.endWrite();
+}
+
 // Full Screen Exponential Segmented Block Bar Graph (20 blocks: 3mm width x 4mm height, 0.5mm gap, Anti-Aliased)
 const uint8_t NUM_BAR_BLOCKS = 20;
 const int16_t blockMinX[20] PROGMEM = {   0,   5,  11,  17,  25,  34,  46,  59,  76,  95, 114, 134, 154, 174, 193, 213, 232, 251, 271, 290 };
@@ -795,8 +840,14 @@ void plotNumeric4(uint8_t cell, float data, int warn, bool digit, String unit) {
   uint16_t col = getMeterColor(pidIdx, data, warn);
 
   if (col == TFT_RED) {
+    if (!wasInRedAlarm[cell]) {
+      drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+    }
     wasInRedAlarm[cell] = true;
   } else {
+    if (wasInRedAlarm[cell]) {
+      drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+    }
     wasInRedAlarm[cell] = false;
   }
 
@@ -871,10 +922,14 @@ void plotArc4(uint8_t cell, float data, int warn, int min, int max, bool digit,
 
   bool colorChanged = (col != oldCol);
   if (col == TFT_RED) {
+    if (!wasInRedAlarm[cell]) {
+      drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+    }
     wasInRedAlarm[cell] = true;
     if (colorChanged) {
       arcFlashVisible = true;
       lastArcFlashTime = millis();
+      drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
       for (uint8_t i = 0; i < newBlocks; i++) {
         drawQuadBarBlock(cell, i, TFT_RED);
       }
@@ -893,6 +948,9 @@ void plotArc4(uint8_t cell, float data, int warn, int min, int max, bool digit,
       }
     }
   } else {
+    if (wasInRedAlarm[cell]) {
+      drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+    }
     wasInRedAlarm[cell] = false;
     if (colorChanged || old_data[cell] < min) {
       for (uint8_t i = 0; i < newBlocks; i++) {
@@ -1031,10 +1089,14 @@ void plotFullScreen(uint8_t cell, float data, int warn, int min, int max,
 
     bool colorChanged = (col != oldCol);
     if (col == TFT_RED) {
+      if (!wasInRedAlarm[cell]) {
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
+      }
       wasInRedAlarm[cell] = true;
       if (colorChanged) {
         arcFlashVisible = true;
         lastArcFlashTime = millis();
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
         for (uint8_t i = 0; i < newBlocks; i++) {
           drawBarBlock(i, TFT_RED);
         }
@@ -1053,6 +1115,9 @@ void plotFullScreen(uint8_t cell, float data, int warn, int min, int max,
         }
       }
     } else {
+      if (wasInRedAlarm[cell]) {
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
+      }
       wasInRedAlarm[cell] = false;
       if (colorChanged || old_data[cell] < min) {
         for (uint8_t i = 0; i < newBlocks; i++) {
@@ -1084,8 +1149,14 @@ void plotFullScreen(uint8_t cell, float data, int warn, int min, int max,
   } else {
     // Digital numeric mode full screen with DSEG7 Smooth Font (Anti-Aliased)
     if (col == TFT_RED) {
+      if (!wasInRedAlarm[cell]) {
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
+      }
       wasInRedAlarm[cell] = true;
     } else {
+      if (wasInRedAlarm[cell]) {
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
+      }
       wasInRedAlarm[cell] = false;
     }
     uint16_t txtCol = (col == TFT_RED && !arcFlashVisible) ? TFT_BLACK : col;
@@ -1316,8 +1387,9 @@ void handleArcAlarmFlash() {
       String numStr = String(data, digit);
 
       if (wasInRedAlarm[cell] && !inRed) {
-        // Exited red alarm: restore steady arc and text
+        // Exited red alarm: restore steady arc, text, and icon
         wasInRedAlarm[cell] = false;
+        drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
         if (!cellIsNumeric[cell]) {
           int min = pidConfig[pidIdx][4].toInt();
           int max = pidConfig[pidIdx][5].toInt();
@@ -1346,6 +1418,11 @@ void handleArcAlarmFlash() {
         wasInRedAlarm[cell] = true;
         if (toggleTick) {
           uint16_t txtCol = arcFlashVisible ? TFT_RED : TFT_BLACK;
+          if (arcFlashVisible) {
+            drawPidIconHeader(10, 4, pidConfig[pidIdx][2]);
+          } else {
+            clearPidIconHeader(10, 4, 42, 42);
+          }
           if (!cellIsNumeric[cell]) {
             int min = pidConfig[pidIdx][4].toInt();
             int max = pidConfig[pidIdx][5].toInt();
@@ -1395,8 +1472,9 @@ void handleArcAlarmFlash() {
         int y = cell4_y[cell];
 
         if (wasInRedAlarm[cell] && !inRed) {
-          // Exited red alarm: restore steady arc and text
+          // Exited red alarm: restore steady arc, text, and icon
           wasInRedAlarm[cell] = false;
+          drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
           if (!cellIsNumeric[cell]) {
             int min = pidConfig[pidIdx][4].toInt();
             int max = pidConfig[pidIdx][5].toInt();
@@ -1425,6 +1503,11 @@ void handleArcAlarmFlash() {
           wasInRedAlarm[cell] = true;
           if (toggleTick) {
             uint16_t txtCol = arcFlashVisible ? TFT_RED : TFT_BLACK;
+            if (arcFlashVisible) {
+              drawPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+            } else {
+              clearPidIcon(x + 5, y + 3, pidConfig[pidIdx][2]);
+            }
             if (!cellIsNumeric[cell]) {
               int min = pidConfig[pidIdx][4].toInt();
               int max = pidConfig[pidIdx][5].toInt();