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Merge pull request #4 from gildurao/feature/turtle-stack
feat: save/pop state commands
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,8 @@ | ||
| ## 0.5.0 | ||
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| - Upgrade to SDK 3.3.0 | ||
| - Add Save/Pop State commands | ||
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| ## 0.4.2 | ||
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| - Upgrade to SDK 2.17.0 | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_turtle/flutter_turtle.dart'; | ||
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| class Rule { | ||
| final String a; | ||
| final String b; | ||
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| const Rule(this.a, this.b); | ||
| } | ||
|
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| class LSystem { | ||
| List<Rule> ruleSet; | ||
| List<TurtleCommand> turtleCommands = []; | ||
| String axiom; | ||
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| LSystem( | ||
| this.axiom, | ||
| this.ruleSet, | ||
| ) { | ||
| turtleCommands.add( | ||
| PenDown(), | ||
| ); | ||
| turtleCommands.add( | ||
| SetColor( | ||
| (_) => Colors.lightGreen, | ||
| ), | ||
| ); | ||
| turtleCommands.add( | ||
| SetStrokeWidth( | ||
| (_) => 2, | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| void resetTurtle() { | ||
| turtleCommands.clear(); | ||
| turtleCommands.add( | ||
| PenDown(), | ||
| ); | ||
| turtleCommands.add( | ||
| SetColor( | ||
| (_) => Colors.green, | ||
| ), | ||
| ); | ||
| turtleCommands.add( | ||
| SetStrokeWidth( | ||
| (_) => 2, | ||
| ), | ||
| ); | ||
| } | ||
|
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| void generate(int iterations) { | ||
| var sentence = axiom; | ||
| while (iterations != 0) { | ||
| StringBuffer nextGeneration = StringBuffer(); | ||
|
|
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| for (int i = 0; i < sentence.length; i++) { | ||
| String current = sentence[i]; | ||
| String replace = current; | ||
| for (int j = 0; j < ruleSet.length; j++) { | ||
| String a = ruleSet.elementAt(j).a; | ||
| if (a == current) { | ||
| replace = ruleSet.elementAt(j).b; | ||
| break; | ||
| } | ||
| } | ||
| nextGeneration.write(replace); | ||
| } | ||
| sentence = nextGeneration.toString(); | ||
| iterations--; | ||
| } | ||
| parseFractalPlant(sentence); | ||
| } | ||
|
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| void parseFractalPlant(String sentence) { | ||
| for (int i = 0; i < sentence.length; i++) { | ||
| String character = sentence[i]; | ||
| if (character == 'F') turtleCommands.add(Forward((_) => 1)); | ||
| if (character == '-') turtleCommands.add(Left((_) => 35.0)); | ||
| if (character == '+') turtleCommands.add(Right((_) => 25.0)); | ||
| if (character == '[') turtleCommands.add(SaveState()); | ||
| if (character == ']') turtleCommands.add(PopState()); | ||
| } | ||
| } | ||
| } | ||
|
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| class LSystemPage extends StatefulWidget { | ||
| const LSystemPage({super.key}); | ||
|
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| @override | ||
| LSystemPageState createState() => LSystemPageState(); | ||
| } | ||
|
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| class LSystemPageState extends State<LSystemPage> { | ||
| LSystem fractalPlant = LSystem( | ||
| 'X', | ||
| const [ | ||
| Rule( | ||
| 'X', | ||
| 'F+[[X]-X]-F[-FX]+X', | ||
| ), | ||
| Rule( | ||
| 'F', | ||
| 'FF', | ||
| ), | ||
| ], | ||
| ); | ||
|
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||
| @override | ||
| Widget build(BuildContext context) { | ||
| fractalPlant.generate(8); | ||
| return Scaffold( | ||
| appBar: AppBar(title: const Text('Logo'), actions: <Widget>[ | ||
| TextButton( | ||
| onPressed: () => setState(() {}), | ||
| child: const Text('Run', style: TextStyle(color: Colors.white)), | ||
| ) | ||
| ]), | ||
| body: Column( | ||
| children: [ | ||
| const SizedBox( | ||
| height: 500, | ||
| ), | ||
| Expanded( | ||
| child: AnimatedTurtleView( | ||
| animationDuration: const Duration(seconds: 5), | ||
| commands: fractalPlant.turtleCommands, | ||
| child: const SizedBox( | ||
| width: double.infinity, | ||
| height: 600, | ||
| ), | ||
| ), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
| } |
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