AlabasterAxe
/ dino.dart
Created
November 10, 2020 00:03
Checking if the dinosaur is already jumping to disallow double jumping
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| void jump() { | |
| if (state != DinoState.jumping) { | |
| velY = 650; | |
| } | |
| } |
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| enum DinoState { | |
| running, | |
| jumping, | |
| } |
AlabasterAxe
/ main.dart
Created
November 10, 2020 00:02
Listen for taps to trigger the dinosaur's jump.
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| return Scaffold( | |
| appBar: AppBar( | |
| title: Text(widget.title), | |
| ), | |
| body: GestureDetector( | |
| behavior: HitTestBehavior.translucent, | |
| onTap: () { | |
| dino.jump(); | |
| }, | |
| child: Stack( |
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| void jump() { | |
| velY = 650; | |
| } |
AlabasterAxe
/ dino.dart
Created
November 10, 2020 00:00
Updating the dinosaur's displacement and velocity in update()
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| @override | |
| void update(Duration lastTime, Duration elapsedTime) { | |
| double elapsedSeconds = | |
| ((elapsedTime.inMilliseconds - lastTime.inMilliseconds) / 1000); | |
| dispY += velY * elapsedSeconds; | |
| if (dispY <= 0) { | |
| dispY = 0; | |
| velY = 0; | |
| } else { |
AlabasterAxe
/ dino.dart
Created
November 9, 2020 23:59
Updated getRect implementation for the Dino GameObject
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| @override | |
| Rect getRect(Size screenSize, double _) { | |
| return Rect.fromLTWH( | |
| screenSize.width / 10, | |
| 4 / 7 * screenSize.height - dino.imageHeight - dispY, | |
| dino.imageWidth.toDouble(), | |
| dino.imageHeight.toDouble()); | |
| } |
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| return Scaffold( | |
| appBar: AppBar( | |
| title: Text(widget.title), | |
| ), | |
| body: Stack( | |
| alignment: Alignment.center, | |
| children: [ | |
| AnimatedBuilder( | |
| animation: worldController, | |
| builder: (context, child) { |
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| @override | |
| void initState() { | |
| super.initState(); | |
| worldController = | |
| AnimationController(vsync: this, duration: Duration(days: 99)); | |
| worldController.addListener(_update); | |
| worldController.forward(); | |
| } |
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| class Dino extends GameObject { | |
| int frame = 1; | |
| @override | |
| Widget render() { | |
| return Image.asset( | |
| "assets/images/dino/dino_$frame.png", | |
| gaplessPlayback: true, | |
| ); | |
| } |
AlabasterAxe
/ main.dart
Created
November 9, 2020 23:54
registering our update call as a listener to our worldController
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| Duration lastUpdateCall = Duration(); | |
| @override | |
| void initState() { | |
| super.initState(); | |
| worldController = | |
| AnimationController(vsync: this, duration: Duration(days: 99)); | |
| worldController.addListener(_update); | |
| } |