README.md

polygon

A simple widget that can draw, change, and drag polygons(You can customize the colors of polygons, edges, and dots).

Demo

See example for details

Usage

Add the package to your pubspec.yml file.

dependencies:
  polygon: ^0.4.0

Next, import the library into your widget.

import 'package:flutter_polygon/flutter_polygon.dart';

Wrap your app widget.

Polygon(
  /// set toast style, optional
  points: points,
  child: child,
);

Method (You can use these function when you want to deal your polygon)

This method can be used to determine whether the formed shape is a polygon or an irregular shape with intersecting line segments

PolygonManager().isRightPolygon;

Options

Polygon have default style, you also can custom style.

name	type	need	desc
child	Widget	required	On the child you want to draw
points	List	required	polygon's points
edgeColor	Color	optional
bodyColor	Color	optional
edgeWidth	double	optional
pointSize	double	optional
pointColor	Color	optional
onPanUpdate	Function	optional	you can set it when you drag
onPanDown	Function	optional
onPanEnd	Function	optional
containerWidth	double	optional
containerHeight	double	optional

Examples

import 'package:flutter/material.dart';
import 'package:flutter_polygon/flutter_polygon.dart';


void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<Point> _points = [];
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    Point point = Point(X: 0, Y: 0);
    List<double> xList= [200, 400, 200, 400];
    List<double> yList= [200, 200, 400, 400];
    for (int i = 0; i < 4; i++) {
      Point points = point.copyWith(xList[i], yList[i]);
      _points.add(points);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Polygon(
      points: _points,
      pointColor: Colors.blue.withOpacity(0.7),
      pointSize: 10,
      edgeColor: Colors.blue,
      edgeWidth: 10,
      child: Scaffold(
        body:SizedBox(),
      ),
    );
  }
}