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fixed shutter speed anchor issue

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Vadim 2023-03-25 23:59:36 +03:00
parent 0713527cfa
commit 200812758d
1 changed files with 21 additions and 3 deletions
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22
lib/screens/metering/bloc_metering.dart
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@ -146,8 +146,26 @@ class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
List<ExposurePair> _buildExposureValues(double ev) {
/// Depending on the `stopType` the exposure pairs list length is multiplied by 1,2 or 3
final int evSteps = (ev * (stopType.index + 1)).round();
final int evOffset =
_shutterSpeedValues.indexOf(const ShutterSpeedValue(1, false, StopType.full)) - evSteps;
/// Basically we use 1" shutter speed as an anchor point for building the exposure pairs list.
/// But user can exclude this value from the list using custom equipment profile.
/// So we have to restore the index of the anchor value.
const ShutterSpeedValue anchorShutterSpeed = ShutterSpeedValue(1, false, StopType.full);
int anchorIndex = _shutterSpeedValues.indexOf(anchorShutterSpeed);
if (anchorIndex < 0) {
final filteredFullList = shutterSpeedValues.whereStopType(stopType);
final customListStartIndex = filteredFullList.indexOf(_shutterSpeedValues.first);
final fullListAnchor = filteredFullList.indexOf(anchorShutterSpeed);
if (customListStartIndex < fullListAnchor) {
/// This means, that user excluded anchor value at the end,
/// i.e. all shutter speed values are shorter than 1".
anchorIndex = fullListAnchor - customListStartIndex;
} else {
/// In case user excludes anchor value at the start,
/// we can do no adjustment.
}
}
final int evOffset = anchorIndex - evSteps;
late final int apertureOffset;
late final int shutterSpeedOffset;