Draw dashed lines with any shape and style you want. Just like that.

LeanCode

Last update: Dec 20, 2022

Related tags

Overview

dashed_line

Draw dashed lines with any shape and style you want. Just like that.

Usage

Add the dependency to your pubspec.yaml (you can see the newest version in the pub badge):

dependencies:
  dashed_line: ^0.1.0

Use the widget:

import 'package:dashed_line/dashed_line.dart';

// ...

DashedLine(
  path: Path()..cubicTo(-40, 53, 14, 86, 61, 102),
  color: Colors.red,
)

...you can also use the SVG path commands instead of a Path:

DashedLine.svgPath(
  'C -40 53 14 86 61 102',
  color: Colors.red,
)

Where to obtain path methods/commands?

There are many ways.

You can construct the path yourself using the Path methods like lineTo or cubicTo.

You can also use the path commands used in the d attribute of SVG files. You can do this manually or via export from one of the vector graphics software, like Inkscape or Figma. We found SvgPathEditor quite useful too.

Example: Exporting path commands from Figma

First step	Second step

And now we have an SVG in the clipboard:

<svg width="190" height="48" viewBox="0 0 190 48" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path d="M1 16C73 79 100 3 121 0.999997C142 -1 214.5 11.5 179 47" stroke="black"/>
svg>

From here we can just copy the value of the path's d attribute and use for the DashedLine.svgPath constructor's first argument.

🚨 Note about paths

Due to how Paths work in Flutter and Skia, the DashedLine widget takes NOT as much space as the dashed line needs, but as much it needs to contain all the control points. Table below should help understand the problem.

Path commands	Path	Result line
`C 8 63 14 86 61 102`
`C -40 53 14 86 61 102`

License

See LICENSE.

Comments

Path()..moveTo() not working as intended with package?

I'm trying to draw a dashed arc, however it appears that the Path()..moveTo() is not working as intended with the package.

Container(
  width: SizeConfig.safeScreenWidth!,
  height: SizeConfig.safeScreenHeight! * 4 / 9,
  child: DashedLine(
    path: Path()
      ..moveTo(
        SizeConfig.safeScreenWidth! * 0.2,
        (SizeConfig.safeScreenHeight! * 4 / 9) * 0.7,
      )
      ..quadraticBezierTo(
        SizeConfig.safeScreenWidth! * 0.5,
        (SizeConfig.safeScreenHeight! * 4 / 9) * 0.3,
        SizeConfig.safeScreenWidth! * 0.8,
        (SizeConfig.safeScreenHeight! * 4 / 9) * 0.7,
      ),
    dashSpace: 1,
    color: Colors.grey,
  )
)

This is the resulting curve: Screenshot 2021-04-09 at 18 33 45

However, I'd like for the curve to start from 20% of the screen width, and end at 80% of the screen width, like this: Screenshot 2021-04-09 at 18 38 09

which I achieved using the same path methods.

opened by 15tariqj 3

Taking actual visible space

First up, this is a really cool package! Thanks for creating it ❤️

Use case

It would be useful if the DashedLine widget was the same size as the visible dashed line instead of the size of the control points.

Proposal

Add option to the DashedLine widget to take up the size that the displayed path will take up.

Current note

I am aware of the note you added to your README, however, I actually think it is somewhat misleading:

Due to how Paths work in Flutter and Skia, the DashedLine widget takes NOT as much space as the dashed line needs, but as much it needs to contain all the control points.

This suggests that this is a limit of the Flutter rendering engine while it is obviously not. You are free to define the size of your render objects however you please.

Implementation

I assume you are using Path.getBounds for the bounds of your DashedLine widget (I have not looked into the implementation).

This, of course, returns the control points. I am not sure if Path.computeMetrics makes figuring out the actual visible bounds any easier, but you can always calculate it yourself if the existing implementation does not provide it for you.
This is clearly possible and probably also fairly trivial (considering the existing work on bezier curves et al.)

opened by creativecreatorormaybenot 0

Releases(v0.1.0+1)

v0.1.0+1(Apr 6, 2021)
Fix README image paths.

Source code(tar.gz)
Source code(zip)
v0.1.0(Apr 6, 2021)
First release.

Source code(tar.gz)
Source code(zip)

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