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43 lines
1.2 KiB
Dart
43 lines
1.2 KiB
Dart
import 'dart:math';
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import '../components/component.dart';
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export './move_effect.dart';
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export './scale_effect.dart';
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abstract class PositionComponentEffect {
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bool _isDisposed = false;
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bool get isDisposed => _isDisposed;
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/// If the animation should first follow the initial curve and then follow the
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/// curve backwards
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bool isAlternating;
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bool isInfinite;
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double percentage;
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double travelTime;
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double _curveTime = 0.0;
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int _curveDirection = 1;
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PositionComponentEffect(this.isInfinite, this.isAlternating);
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void update(double dt) {
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_curveTime += dt * _curveDirection;
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if (isAlternating) {
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_curveDirection = isMax() ? -1 : (isMin() ? 1 : _curveDirection);
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} else if (isInfinite && isMax()) {
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_curveTime = 0.0;
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}
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percentage = min(1.0, max(0.0, _curveTime / travelTime));
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}
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void dispose() => _isDisposed = true;
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PositionComponent component;
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bool hasFinished() =>
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(!isInfinite && !isAlternating && isMax()) ||
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(!isInfinite && isAlternating && isMin()) ||
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isDisposed;
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bool isMax() => percentage == null ? false : percentage == 1.0;
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bool isMin() => percentage == null ? false : percentage == 0.0;
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}
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