Bangle.js: If screen is rotated, also rotate accelerometer and magnet…

…ometer values

Fixes espruino/BangleApps#2999

ChangeLog

@@ -48,6 +48,7 @@
             Allow E.pipe to pipe from Strings, remove pipe's internal `position` counter (fix #2352)
             Bangle.js 1: remove OneWire and JIT as it uses too much flash space to exist alongside UTF8+Tensorflow on nRF52
             ARM: Apply -fmerge-all-constants to the build (saves ~1kb)
+            Bangle.js: If screen is rotated, also rotate accelerometer and magnetometer values
 
      2v18 : Fix drawString with setClipRect with 90/270-degree rotation (fix #2343)
             Pico/Wifi: Enabled JIT compiler

libs/banglejs/jswrap_bangle.c

@@ -1301,6 +1301,15 @@ void peripheralPollHandler() {
     }
 #endif
     if (newReading) {
+      // if the graphics instance is rotated, also rotate magnetometer values
+      if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_SWAP_XY) {
+        short t = mag.x;
+        mag.x = mag.y;
+        mag.y = t;
+      }
+      if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_INVERT_X) mag.x = -mag.x;
+      if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_INVERT_Y) mag.y = -mag.y;
+      // Work out min and max values for auto-calibration
       if (mag.x<magmin.x) {
         magmin.x=mag.x;
         if (magmax.x-magmin.x > MAG_MAX_RANGE)
@@ -1429,6 +1438,15 @@ void peripheralPollHandler() {
 #ifdef ACCEL_DEVICE_KX126
     newy = -newy;
 #endif
+    // if the graphics instance is rotated, also rotate accelerometer values
+    if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_INVERT_X) newx = -newx;
+    if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_INVERT_Y) newy = -newy;
+    if (graphicsInternal.data.flags & JSGRAPHICSFLAGS_SWAP_XY) {
+      short t = newx;
+      newx = newy;
+      newy = t;
+    }
+
     int dx = newx-acc.x;
     int dy = newy-acc.y;
     int dz = newz-acc.z;