Update Screen.cpp

Add option to switch between static/non-static North.

src/graphics/Screen.cpp

@@ -64,6 +64,11 @@ namespace graphics
 static FrameCallback normalFrames[MAX_NUM_NODES + NUM_EXTRA_FRAMES];
 static uint32_t targetFramerate = IDLE_FRAMERATE;
 static char btPIN[16] = "888888";
+    
+// This defines the layout of the compass.
+// If true, North with remain static at the top of the compass.
+// If false, your current heading is static at the top of the compass.
+bool compassNorthTop = false;
 
 // This image definition is here instead of images.h because it's modified dynamically by the drawBattery function
 uint8_t imgBattery[16] = {0xFF, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0xE7, 0x3C};
@@ -687,6 +692,10 @@ static void drawNodeHeading(OLEDDisplay *display, int16_t compassX, int16_t comp
 // Draw north
 static void drawCompassNorth(OLEDDisplay *display, int16_t compassX, int16_t compassY, float myHeading)
 {
+    //If north is supposed to be at the top of the compass we want rotation to be +0
+    if(compassNorthTop)
+        myHeading = -0;
+    
     Point N1(-0.04f, 0.65f), N2(0.04f, 0.65f);
     Point N3(-0.04f, 0.55f), N4(0.04f, 0.55f);
     Point *rosePoints[] = {&N1, &N2, &N3, &N4};
@@ -780,8 +789,11 @@ static void drawNodeInfo(OLEDDisplay *display, OLEDDisplayUiState *state, int16_
 
             float bearingToOther =
                 GeoCoord::bearing(DegD(op.latitude_i), DegD(op.longitude_i), DegD(p.latitude_i), DegD(p.longitude_i));
-            float headingRadian = bearingToOther - myHeading;
-            drawNodeHeading(display, compassX, compassY, headingRadian);
+            // If the top of the compass is a static north then bearingToOther can be drawn on the compass directly
+            // If the top of the compass is not a static north we need adjust bearingToOther based on heading
+            if(!compassNorthTop)
+                float bearingToOther = bearingToOther - myHeading;
+            drawNodeHeading(display, compassX, compassY, bearingToOther);
         }
     }
     if (!hasNodeHeading)