NavigationMathUtils class
Properties
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hashCode
→ int
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The hash code for this object.
no setterinherited
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runtimeType
→ Type
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A representation of the runtime type of the object.
no setterinherited
Methods
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noSuchMethod(Invocation invocation)
→ dynamic
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Invoked when a nonexistent method or property is accessed.
inherited
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toString()
→ String
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A string representation of this object.
inherited
Static Methods
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catmullRom(LatLng p0, LatLng p1, LatLng p2, LatLng p3, double t)
→ LatLng
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E3: Catmull-Rom Spline
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computeAdaptiveAccuracy(double speedMps)
→ double
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D+4: Speed-adaptive GPS accuracy threshold.
Low speed → stricter (20m), high speed → more lenient (50m).
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computeBearing(LatLng start, LatLng end)
→ double
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computeConfidence(double offRouteDistance)
→ double
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E5: Sigmoid Confidence (Google Maps standard)
Midpoint of 9.0m ensures standard lane variations (0-6m) remain snapped (>80%),
while lateral deviations towards parallel frontage roads (>10m) release snapping
so the vehicle marker accurately follows the actual frontage road.
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computeDestination(LatLng start, double bearingDeg, double distanceMeters)
→ LatLng
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Computes a destination point given a start point, bearing (degrees), and distance (meters).
Uses the Haversine forward formula.
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crossTrackError(LatLng point, LatLng segA, LatLng segB)
→ double
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E2: Cross-Track Error (XTE)
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easeInOutCubic(double t)
→ double
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E4: Easing Functions
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easeOutQuad(double t)
→ double
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haversineDistance(LatLng pos1, LatLng pos2)
→ double
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interpolatePosition(LatLng p1, LatLng p2, double fraction)
→ LatLng
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nearestPointOnSegment(LatLng p, LatLng a, LatLng b)
→ LatLng
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Calculates the nearest point on a line segment
a, b to a target point p.
(Snap-to-road logic)
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pointToLineDistanceM(LatLng p, LatLng a, LatLng b)
→ double
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Calculates the perpendicular distance in meters from point
p to line segment a, b.
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responsiveIconScale()
→ double
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Computes a responsive scale factor based on the device's shortest screen dimension.
Reference device: ~390pt width (iPhone 14 / standard phone) → factor 1.0.
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segmentAwareSnap(LatLng gpsPos, List<LatLng> geometry, {double? userBearing, int startIndex = 0})
→ Map<String, dynamic>
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D+1: Segment-aware snap that only searches forward from
startIndex
to prevent backward jumps along the route.
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snapToRoute(LatLng gpsPos, List<LatLng> geometry, {double? userBearing})
→ Map<String, dynamic>
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weightedBearing(double gpsBearing, double roadBearing, double confidence)
→ double
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E6: Weighted Bearing
