Vertical dotted Line between two or multiple points in Flutter

Question

I need a lil help to draw dotted line between 2 points without using google map's poly lines. I tried with canvas, it does but not exactly start under and above location.

Right now you can see 2 points later it'll be more than 2 points. It really appreciated if anyone help me to achieve.

score 18 · Answer 1 · edited Jan 04 '23 at 05:35

I think drawing is more efficient than creating more containers like the one above. If you don't want to use the library, you can use my following method, simply adding a few lines:

Create class DashedLineVerticalPainter:

class DashedLineVerticalPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    double dashHeight = 5, dashSpace = 3, startY = 0;
    final paint = Paint()
      ..color = Colors.grey[300]
      ..strokeWidth = size.width;
    while (startY < size.height) {
      canvas.drawLine(Offset(0, startY), Offset(0, startY + dashHeight), paint);
      startY += dashHeight + dashSpace;
    }
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => false;
}

And use it:

CustomPaint(
      size: Size(1, double.infinity),
      painter: DashedLineVerticalPainter()
   )

Result:

I think it should be changed to consider the width informed in the size parameter: "strokeWidth = size.width" — Cícero Moura, Dec 30 '22 at 17:20

score 7 · Accepted Answer · answered Feb 21 '20 at 04:35

I have made almost same looking widget by using https://pub.dev/packages/flutter_dash, you can also customise this widget according to your style.

Here is the code,Hope it helps.

  Column(children: <Widget>[
                  Container(
                    margin: EdgeInsets.only(top: 16),
                    height: 25,
                    width: 25,
                    decoration: BoxDecoration(
                        shape: BoxShape.circle,
                        border:
                            Border.all(width: 1.5, color: Colors.greenAccent)),
                  ),
                  Dash(
                      direction: Axis.vertical,
                      length: 130,
                      dashLength: 15,
                      dashColor: grey),
                  Container(
                    height: 25,
                    width: 25,
                    decoration: BoxDecoration(
                        shape: BoxShape.rectangle,
                        border: Border.all(width: 2, color: red)),
                    child: Container(
                      height: 20,
                    ),
                  ),
                ],
              ),

Do you know by any chance how to modify your code in order that the line will be appeared over the shapes (in front of them)? — Yahav Festinger, Oct 17 '20 at 10:00

score 3 · Answer 3 · answered Feb 21 '20 at 06:49

class _MyWidgetState extends State<MyWidget> {
  List<Model> list = [];

  @override
  void initState() {
    super.initState();
    list.add(Model("Hyderabad", Colors.red));
    list.add(Model("Visakhapatnam", Colors.green));
    list.add(Model("Vijayawada", Colors.blue));
  }

  void addNew() {
    setState(() {
      list.add(Model("Karnool", Colors.black));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            backgroundColor: Colors.black,
            title:
                Text('Custom Stepper', style: TextStyle(color: Colors.white)),
            actions: [
              IconButton(
                  icon: Icon(Icons.add_circle, color: Colors.white),
                  onPressed: addNew)
            ]),
        body: Container(
            padding: EdgeInsets.all(15),
            color: Colors.white,
            child: ListView.builder(
                itemCount: list.length,
                itemBuilder: (con, ind) {
                  return ind != 0
                      ? Column(mainAxisSize: MainAxisSize.min, children: [
                          Row(children: [
                            Column(
                              children: List.generate(
                                3,
                                (ii) => Padding(
                                    padding: EdgeInsets.only(
                                        left: 10, right: 10, top: 5, bottom: 5),
                                    child: Container(
                                      height: 3,
                                      width: 2,
                                      color: Colors.grey,
                                    )),
                              ),
                            ),
                            Expanded(
                                child: Container(
                              color: Colors.grey.withAlpha(60),
                              height: 0.5,
                              padding: EdgeInsets.only(
                                left: 10,
                                right: 20,
                              ),
                            ))
                          ]),
                          Row(children: [
                            Icon(Icons.location_on, color: list[ind].color),
                            Text(list[ind].address,
                                style: TextStyle(color: list[ind].color))
                          ])
                        ])
                      : Row(children: [
                          Icon(Icons.location_on, color: list[ind].color),
                          Text(list[ind].address,
                              style: TextStyle(color: list[ind].color))
                        ]);
                })));
  }
}

class Model {
  String address;
  double lat;
  double long;
  Color color;
  //Other fields if needed....
  Model(this.address, this.color);
  //initialise other fields so on....
}

Try changing icon size to `80` and it won't work properly. – Nehal Jaisalmeria Sep 01 '21 at 18:39 — Nehal Jaisalmeria, Sep 01 '21 at 18:39

Joel jones · Answer 4 · 2020-02-21T06:48:14.357

return Container(
    child: Row(
    children: <Widget>[
      Column(children: <Widget>[
              Icon(Icons.radio_button_checked,color: Colors.orange,)
              Dash(
                  direction: Axis.vertical,
                  length: 20,
                  dashLength: 5,
                  thickness:3.0,
                  dashColor: Colors.grey[400]),
              Icon(Icons.location_on,color: Colors.blue,)
            ],
          ),
      Column(children: <Widget>[
              Text("Some text"),
              Divider(),
              Text("Some Text")
            ],
          ),
    ],

    )
);

Vertical dotted Line between two or multiple points in Flutter

4 Answers4