Support load/save/default of NaN for param

src/JsonHelper.cc

@@ -102,6 +102,10 @@ bool JsonHelper::validateKeyTypes(const QJsonObject& jsonObject, const QStringLi
         QString valueKey = keys[i];
         if (jsonObject.contains(valueKey)) {
             const QJsonValue& jsonValue = jsonObject[valueKey];
+            if (types[i] == QJsonValue::Null && jsonValue.type() == QJsonValue::Double) {
+                // Null type signals a NaN on a double value
+                continue;
+            }
             if (jsonValue.type() != types[i]) {
                 errorString  = QObject::tr("Incorrect value type - key:type:expected %1:%2:%3").arg(valueKey).arg(_jsonValueTypeToString(jsonValue.type())).arg(_jsonValueTypeToString(types[i]));
                 return false;
@@ -342,3 +346,12 @@ void JsonHelper::savePolygon(QmlObjectListModel& list, QJsonArray& polygonArray)
         polygonArray.append(jsonValue);
     }
 }
+
+double JsonHelper::possibleNaNJsonValue(const  QJsonValue& value)
+{
+    if (value.type() == QJsonValue::Null) {
+        return std::numeric_limits<double>::quiet_NaN();
+    } else {
+        return value.toDouble();
+    }
+}

src/JsonHelper.h

@@ -34,20 +34,30 @@ public:
     ///     jsonFileTypeKey - Required and checked to be equal to expectedFileType
     ///     jsonVersionKey - Required and checked to be below supportedMajorVersion, supportedMinorVersion
     ///     jsonGroundStationKey - Required and checked to be string type
-    /// @return false: validation failed
-    static bool validateQGCJsonFile(const QJsonObject&  jsonObject,             ///< root json object
+    /// @return false: validation failed, errorString set
+    static bool validateQGCJsonFile(const QJsonObject&  jsonObject,             ///< json object to validate
                                     const QString&      expectedFileType,       ///< correct file type for file
                                     int                 minSupportedVersion,    ///< minimum supported version
                                     int                 maxSupportedVersion,    ///< maximum supported major version
                                     int                 &version,               ///< returned file version
                                     QString&            errorString);           ///< returned error string if validation fails
 
-    static bool validateRequiredKeys(const QJsonObject& jsonObject, const QStringList& keys, QString& errorString);
-    static bool validateKeyTypes(const QJsonObject& jsonObject, const QStringList& keys, const QList<QJsonValue::Type>& types, QString& errorString);
+    /// Validates that the specified keys are in the object
+    /// @return false: validation failed, errorString set
+    static bool validateRequiredKeys(const QJsonObject& jsonObject, ///< json object to validate
+                                     const QStringList& keys,       ///< keys which are required to be present
+                                     QString& errorString);         ///< returned error string if validation fails
+
+    /// Validates the types of specified keys are in the object
+    /// @return false: validation failed, errorString set
+    static bool validateKeyTypes(const QJsonObject& jsonObject,         ///< json object to validate
+                                 const QStringList& keys,               ///< keys to validate
+                                 const QList<QJsonValue::Type>& types,  ///< required type for each key, QJsonValue::Null specifies double with possible NaN
+                                 QString& errorString);                 ///< returned error string if validation fails
 
     typedef struct {
         const char*         key;        ///< json key name
-        QJsonValue::Type    type;       ///< type of key
+        QJsonValue::Type    type;       ///< required type for key, QJsonValue::Null specifies double with possible NaN
         bool                required;   ///< true: key must be present
     } KeyValidateInfo;
 
@@ -96,6 +106,8 @@ public:
 
     static bool parseEnum(const QJsonObject& jsonObject, QStringList& enumStrings, QStringList& enumValues, QString& errorString);
 
+    /// Returns NaN if the value is null, or it not the double value
+    static double possibleNaNJsonValue(const QJsonValue& value);
 
     static const char* jsonVersionKey;
     static const char* jsonGroundStationKey;

src/MissionManager/MavCmdInfoCommon.json

@@ -54,6 +54,7 @@
                 "label":            "Heading",
                 "units":            "radians",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -75,6 +76,7 @@
                 "label":            "Heading",
                 "units":            "radians",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -101,6 +103,7 @@
                 "label":            "Heading",
                 "units":            "radians",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -157,6 +160,7 @@
                 "label":            "Heading",
                 "units":            "radians",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -178,6 +182,7 @@
                 "label":            "Heading",
                 "units":            "radians",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -316,6 +321,7 @@
                 "label":            "Heading",
                 "units":            "deg",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },
@@ -331,6 +337,7 @@
                 "label":            "Heading",
                 "units":            "deg",
                 "nanUnchanged":     true,
+                "default":          null,
                 "decimalPlaces":    2
             }
         },

src/MissionManager/MissionCommandUIInfo.cc

@@ -334,7 +334,7 @@ bool MissionCommandUIInfo::loadJsonInfo(const QJsonObject& jsonObject, bool requ
 
             // Validate key types
             QList<QJsonValue::Type> types;
-            types << QJsonValue::Double <<  QJsonValue::Double << QJsonValue::String << QJsonValue::String << QJsonValue::String << QJsonValue::String << QJsonValue::Bool;
+            types << QJsonValue::Null <<  QJsonValue::Double << QJsonValue::String << QJsonValue::String << QJsonValue::String << QJsonValue::String << QJsonValue::Bool;
             if (!JsonHelper::validateKeyTypes(jsonObject, allParamKeys, types, internalError)) {
                 errorString = _loadErrorString(internalError);
                 return false;
@@ -358,7 +358,15 @@ bool MissionCommandUIInfo::loadJsonInfo(const QJsonObject& jsonObject, bool requ
             paramInfo->_nanUnchanged =  paramObject.value(_nanUnchangedJsonKey).toBool(false);
 
             if (paramObject.contains(_defaultJsonKey)) {
-                paramInfo->_defaultValue = paramObject.value(_defaultJsonKey).toDouble(0.0);
+                if (paramInfo->_nanUnchanged) {
+                    paramInfo->_defaultValue = JsonHelper::possibleNaNJsonValue(paramObject[_defaultJsonKey]);
+                } else {
+                    if (paramObject[_defaultJsonKey].type() == QJsonValue::Null) {
+                        errorString = QString("Param %1 default value was null/NaN but NaN is not allowed");
+                        return false;
+                    }
+                    paramInfo->_defaultValue = paramObject.value(_defaultJsonKey).toDouble(0.0);
+                }
             } else {
                 paramInfo->_defaultValue = paramInfo->_nanUnchanged ? std::numeric_limits<double>::quiet_NaN() : 0;
             }

src/MissionManager/MissionItem.cc

@@ -260,6 +260,13 @@ bool MissionItem::load(const QJsonObject& json, int sequenceNumber, QString& err
         return false;
     }
 
+    for (int i=0; i<4; i++) {
+        if (rgParams[i].type() != QJsonValue::Double && rgParams[i].type() != QJsonValue::Null) {
+            errorString = tr("Param %1 incorrect type %2, must be double or null").arg(i+1).arg(rgParams[i].type());
+            return false;
+        }
+    }
+
     // Make sure to set these first since they can signal other changes
     setFrame((MAV_FRAME)v2Json[_jsonFrameKey].toInt());
     setCommand((MAV_CMD)v2Json[_jsonCommandKey].toInt());
@@ -280,10 +287,10 @@ bool MissionItem::load(const QJsonObject& json, int sequenceNumber, QString& err
     setSequenceNumber(sequenceNumber);
     setAutoContinue(v2Json[_jsonAutoContinueKey].toBool());
 
-    setParam1(rgParams[0].toDouble());
-    setParam2(rgParams[1].toDouble());
-    setParam3(rgParams[2].toDouble());
-    setParam4(rgParams[3].toDouble());
+    setParam1(JsonHelper::possibleNaNJsonValue(rgParams[0]));
+    setParam2(JsonHelper::possibleNaNJsonValue(rgParams[1]));
+    setParam3(JsonHelper::possibleNaNJsonValue(rgParams[2]));
+    setParam4(JsonHelper::possibleNaNJsonValue(rgParams[3]));
 
     return true;
 }

src/MissionManager/SimpleMissionItem.cc

@@ -633,6 +633,7 @@ void SimpleMissionItem::setDefaultsForCommand(void)
         _missionItem.setParam2(0);
         break;
 
+    case MAV_CMD_NAV_VTOL_LAND:
     case MAV_CMD_NAV_LAND:
     case MAV_CMD_NAV_VTOL_LAND:
         _missionItem.setParam7(0);