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24 lines
1.1 KiB
Dart
24 lines
1.1 KiB
Dart
/// Shared validation helpers for geographic coordinates and zoom levels.
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///
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/// Used anywhere a [LatLng]-like value or zoom level comes from an external
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/// or platform source (GPS fixes, persisted preferences, live map camera
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/// state) that isn't guaranteed to be finite/in-range. Centralizing this
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/// avoids subtly inconsistent validation logic being duplicated across the
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/// GPS controller, map position persistence, and live camera guards.
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library;
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/// Validate that a latitude or longitude value is finite and within the
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/// valid range for geographic coordinates (-180 to 180).
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///
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/// Note: this intentionally uses the wider +/-180 range (rather than +/-90
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/// for latitude) so a single helper can validate both latitude and
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/// longitude values without the caller needing to track which is which.
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bool isValidCoordinate(double value) {
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return !value.isNaN && !value.isInfinite && value >= -180.0 && value <= 180.0;
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}
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/// Validate that a zoom level is finite and within a sane range.
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bool isValidZoom(double zoom, {double min = 0.0, double max = 25.0}) {
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return !zoom.isNaN && !zoom.isInfinite && zoom >= min && zoom <= max;
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}
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