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Adding ScaleEffect

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This commit is contained in:
Erick Zanardo
2020-04-08 21:36:33 -03:00
parent 9356132325
commit f993aadceb
6 changed files with 271 additions and 68 deletions
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99
lib/effects/effects.dart
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@ -2,6 +2,7 @@ import 'package:flutter/animation.dart';
import 'package:meta/meta.dart';
import 'dart:math';
import 'dart:ui';
import '../position.dart';
import '../components/component.dart';
@ -10,11 +11,66 @@ abstract class PositionComponentEffect {
void update(double dt);
bool hasFinished();
PositionComponent component;
}
double _direction(double p, double d) => p < d ? -1 : 1;
double _size(double a, double b) => (a - b).abs();
class ScaleEffect extends PositionComponentEffect {
Size size;
double speed;
Curve curve;
double _scaleTime;
double _ellapsedTime = 0.0;
Size _original;
Size _diff;
final Position _dir = Position(0, 0);
ScaleEffect({
@required this.size,
@required this.speed,
this.curve,
});
@override
set component(_comp) {
super.component = _comp;
_original = Size(component.width, component.height);
_diff = Size(
_size(_original.width, size.width),
_size(_original.height, size.height),
);
_dir.x = _direction(size.width, _original.width);
_dir.y = _direction(size.height, _original.height);
_scaleTime = max(
_diff.width / speed,
_diff.height / speed,
);
}
@override
void update(double dt) {
if (!hasFinished()) {
final double percent = min(1.0, _ellapsedTime / _scaleTime);
final double c = curve != null ? curve.transform(percent) : 1.0;
component.width = _original.width + _diff.width * c * _dir.x;
component.height = _original.height + _diff.height * c * _dir.y;
}
_ellapsedTime += dt;
}
@override
bool hasFinished() => _ellapsedTime >= _scaleTime;
}
class MoveEffect extends PositionComponentEffect {
Position destination;
double speed;
Curve curve;
@ -31,33 +87,33 @@ class MoveEffect extends PositionComponentEffect {
double _ellapsedTime = 0.0;
bool _valuesInitted = false;
MoveEffect({
@required this.destination,
@required this.speed,
this.curve,
});
@override
set component(_comp) {
super.component = _comp;
_xOriginal = component.x;
_yOriginal = component.y;
_xDistance = _size(destination.x, component.x);
_yDistance = _size(destination.y, component.y);
_xDirection = _direction(destination.x, component.x);
_yDirection = _direction(destination.y, component.y);
_travelTime = max(
_xDistance / speed,
_yDistance / speed,
);
}
@override
void update(double dt) {
if (!_valuesInitted) {
_xOriginal = component.x;
_xDistance = (destination.x - component.x).abs();
final _xTravelTime = _xDistance / speed;
_xDirection = destination.x < component.x ? - 1 : 1;
_yOriginal = component.y;
_yDistance = (destination.y - component.y).abs();
final _yTravelTime = _yDistance / speed;
_yDirection = destination.y < component.y ? - 1 : 1;
_travelTime = max(_xTravelTime, _yTravelTime);
_valuesInitted = true;
}
if (!hasFinished()) {
final double percent = min(1.0, _ellapsedTime / _travelTime);
final double c = curve != null ? curve.transform(percent) : 1.0;
@ -68,6 +124,7 @@ class MoveEffect extends PositionComponentEffect {
_ellapsedTime += dt;
}
@override
bool hasFinished() => _ellapsedTime >= _travelTime;
bool hasFinished() => _ellapsedTime >= _travelTime;
}