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better limits for min/max zoom validations, separate lat+lon validation, less verbose comments

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stopflock
2026-07-25 16:42:38 -05:00
parent dd8c9b88cc
commit af2a08bf3d
5 changed files with 87 additions and 98 deletions
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lib/services/coordinate_validation.dart
+17 -13
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@@ -1,23 +1,27 @@
/// Shared validation helpers for geographic coordinates and zoom levels.
///
/// Used anywhere a [LatLng]-like value or zoom level comes from an external
/// or platform source (GPS fixes, persisted preferences, live map camera
/// state) that isn't guaranteed to be finite/in-range. Centralizing this
/// avoids subtly inconsistent validation logic being duplicated across the
/// GPS controller, map position persistence, and live camera guards.
/// Used wherever a coordinate or zoom level comes from an external source
/// (GPS fixes, persisted preferences, live map camera state) that isn't
/// guaranteed to be finite/in-range.
library;
/// Validate that a latitude or longitude value is finite and within the
/// valid range for geographic coordinates (-180 to 180).
///
/// Note: this intentionally uses the wider +/-180 range (rather than +/-90
/// for latitude) so a single helper can validate both latitude and
/// longitude values without the caller needing to track which is which.
bool isValidCoordinate(double value) {
import '../dev_config.dart' show kAbsoluteMaxZoom;
/// Validate that a latitude value is finite and within -90 to 90.
bool isValidLatitude(double value) {
return !value.isNaN && !value.isInfinite && value >= -90.0 && value <= 90.0;
}
/// Validate that a longitude value is finite and within -180 to 180.
bool isValidLongitude(double value) {
return !value.isNaN && !value.isInfinite && value >= -180.0 && value <= 180.0;
}
/// Validate that a zoom level is finite and within a sane range.
bool isValidZoom(double zoom, {double min = 0.0, double max = 25.0}) {
///
/// Defaults to 1.0 to [kAbsoluteMaxZoom]. `num` is used (rather than
/// `double`) so the `int` constant [kAbsoluteMaxZoom] can be used directly
/// as a default parameter value.
bool isValidZoom(double zoom, {num min = 1.0, num max = kAbsoluteMaxZoom}) {
return !zoom.isNaN && !zoom.isInfinite && zoom >= min && zoom <= max;
}