[ios] Add random smoothly changed elevation to iOS Simulator for testing track recording

Signed-off-by: Alexander Borsuk <me@alex.bio>

iphone/Maps/Core/Location/MWMLocationManager.mm

@@ -10,6 +10,10 @@
 
 #include "map/gps_tracker.hpp"
 
+#if TARGET_OS_SIMULATOR
+#include "MountainElevationGenerator.hpp"
+#endif
+
 namespace
 {
 using Observer = id<MWMLocationObserver>;
@@ -472,6 +476,25 @@ void setShowLocationAlert(BOOL needShow) {
   if (location.horizontalAccuracy < 0.)
     return;
 
+#if TARGET_OS_SIMULATOR
+  // There is no simulator < 15.0 in the new XCode.
+  if (@available(iOS 15.0, *))
+  {
+    // iOS Simulator doesn't provide any elevation in its locations. Mock it.
+    static MountainElevationGenerator generator;
+    location = [[CLLocation alloc] initWithCoordinate:location.coordinate
+                                             altitude:generator.NextElevation()
+                                   horizontalAccuracy:location.horizontalAccuracy
+                                     verticalAccuracy:location.horizontalAccuracy
+                                               course:location.course
+                                       courseAccuracy:location.courseAccuracy
+                                                speed:location.speed
+                                        speedAccuracy:location.speedAccuracy
+                                            timestamp:location.timestamp
+                                           sourceInfo:location.sourceInformation];
+  }
+#endif
+
   self.lastLocationStatus = MWMLocationStatusNoError;
   self.locationSource = location::EAppleNative;
   [self processLocationUpdate:location];

iphone/Maps/Core/Location/MountainElevationGenerator.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <ctime>
+#include <random>
+
+class MountainElevationGenerator
+{
+  static double constexpr kRandom{-1.};
+
+  std::mt19937_64 rng;
+
+  double const minElevation;
+  double const maxElevation;
+  double const maxSlopeChange;
+
+  std::normal_distribution<double> slopeChangeDist;
+
+  double currentElevation;
+  double currentSlope;
+
+  double ValueOrRandomInRange(double value, double min, double max)
+  {
+    if (value != kRandom)
+      return value;
+
+    return std::uniform_int_distribution<>(min, max)(rng);
+  }
+
+public:
+  MountainElevationGenerator(double minElevation = kRandom, double maxElevation = kRandom,
+                             double startElevation = kRandom, double maxSlopeChange = kRandom,
+                             time_t seed = std::time(nullptr))
+    : rng(seed)
+    , minElevation(ValueOrRandomInRange(minElevation, 0., 2000.))
+    , maxElevation(ValueOrRandomInRange(maxElevation, 3000., 7000.))
+    , maxSlopeChange(ValueOrRandomInRange(maxSlopeChange, 1., 5.))
+    , slopeChangeDist(0.0, maxSlopeChange)
+    , currentElevation(ValueOrRandomInRange(startElevation, minElevation, maxElevation))
+    , currentSlope(0.0)
+  {}
+
+  double NextElevation()
+  {
+    // Change the slope gradually
+    currentSlope += slopeChangeDist(rng);
+
+    // Limit maximum steepness
+    currentSlope = std::max(-maxSlopeChange, std::min(maxSlopeChange, currentSlope));
+
+    // Update elevation based on current slope
+    currentElevation += currentSlope;
+
+    // Ensure we stay within elevation bounds
+    if (currentElevation < minElevation)
+    {
+      currentElevation = minElevation;
+      currentSlope = std::abs(currentSlope) * 0.5;  // Bounce back up
+    }
+    if (currentElevation > maxElevation)
+    {
+      currentElevation = maxElevation;
+      currentSlope = -std::abs(currentSlope) * 0.5;  // Start going down
+    }
+
+    return currentElevation;
+  }
+};

iphone/Maps/Maps.xcodeproj/project.pbxproj

@@ -1746,6 +1746,7 @@
 		FA3C4FE52D0DB7A600E6C03A /* sr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = sr; path = sr.lproj/InfoPlist.strings; sourceTree = "<group>"; };
 		FA3C4FE62D0DB7A700E6C03A /* sr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = sr; path = sr.lproj/Localizable.strings; sourceTree = "<group>"; };
 		FA3C4FE72D0DB7A700E6C03A /* sr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = sr; path = sr.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
+		FA439D842DF618670023C181 /* MountainElevationGenerator.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = MountainElevationGenerator.hpp; sourceTree = "<group>"; };
 		FA456C3B26BDC6AD00B83C20 /* Chart.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = Chart.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		FA456C4026BDCC8E00B83C20 /* shaders.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = shaders.xcodeproj; path = ../../xcode/shaders/shaders.xcodeproj; sourceTree = "<group>"; };
 		FA459EB314327AF700B5BB3C /* WorldCoasts.mwm */ = {isa = PBXFileReference; lastKnownFileType = file; name = WorldCoasts.mwm; path = ../../data/WorldCoasts.mwm; sourceTree = "<group>"; };
@@ -2098,6 +2099,7 @@
 		340475291E081A4600C92850 /* Location */ = {
 			isa = PBXGroup;
 			children = (
+				FA439D842DF618670023C181 /* MountainElevationGenerator.hpp */,
 				3404752A1E081A4600C92850 /* MWMLocationHelpers.h */,
 				3404752B1E081A4600C92850 /* MWMLocationManager.h */,
 				3404752C1E081A4600C92850 /* MWMLocationManager.mm */,