The barcode painter is not centered inside the barcode image as you can see on the image.

Steps to Reproduce:

BarCodeImage( data: "1234243534557", codeType: BarCodeType.CodeEAN13, lineWidth: 3.0, backgroundColor: Colors.blue, ),

This also includes formatting and padding fixes.

I've replaced the usage of BarCodeType with an abstract class BarCodeParams which will allow custom params for each barcode type, which i believe is a change worth implementing for future expand-ability.

test to generate two barcode, the sencod can't not scan new BarCodeItem(type: BarCodeType.Code128, codeStr: "FS23030049234", description: "Code128", hasText: true), new BarCodeItem(type: BarCodeType.Code128, codeStr: "FS23030049MDUxMQ==", description: "Code128", hasText: true),

thanks~

@sooxiaotong FittedBox does not help with this. I've attached a screenshot to show that the barcode width is larger than the width computed by the package. And I am also generationg barcode for code128. I know the _calcCanvasWIdth() should be modified but I would have to invest some time to figure out how to do it.

Anyway, I was hoping the author would provide some direct help. Thanks.

Originally posted by @kaciula in https://github.com/bigship/barcode.flutter/issues/1#issuecomment-529095334

Code128 value 102 pattern is defined as 0x7a2, but it is actually 0x7ae. As a result, an incorrect barcode is output when FNC1 is output or when the check digit result is 102.

Hi! I try to display an EAN-8 barcode with value '90311130'. But I get an exception 'RangeError (index): Invalid value: Not in range 0..9, inclusive: 10'

return Center( child: Container( child: BarCodeImage( data: '90311130', codeType: BarCodeType.CodeEAN8, barHeight: 100.0, hasText: true, onError: (error) { print("Generate barcode failed. error msg: $error"); }, ), ));

Exception:

════════ Exception caught by rendering library ═════════════════════════════════ The following RangeError was thrown during paint(): RangeError (index): Invalid value: Not in range 0..9, inclusive: 10

User-created ancestor of the error-causing widget was BarCodeImage lib/pages/mobil_cards.dart:392 When the exception was thrown, this was the stack #0 List.[] (dart:core-patch/growable_array.dart:147:60) #1 BarCodePainter._drawBarCodeEAN8 package:barcode_flutter/src/barcode_painter.dart:574 #2 BarCodePainter.paint package:barcode_flutter/src/barcode_painter.dart:30 #3 RenderCustomPaint._paintWithPainter package:flutter/…/rendering/custom_paint.dart:528 #4 RenderCustomPaint.paint package:flutter/…/rendering/custom_paint.dart:566 ... The following RenderObject was being processed when the exception was fired: RenderCustomPaint#74661 RenderObject: RenderCustomPaint#74661 parentData: offset=Offset(5.0, 5.0) (can use size) constraints: BoxConstraints(w=152.0, h=98.0) size: Size(152.0, 98.0) ════════════════════════════════════════════════════════════════════════════════

In _drawBarCodeEAN8 checkCode is computed like

    checkCode = 10 - (sum2nd*3+sum3rd) % 10;

If sum in bracets = 0, then checkCode will be 10, then it will throw.

Algorithm should be like analogue to current EAN13 or UPC,

    if ((sum2nd + sum3rd * 3) % 10 == 0) {
      checkCode = 0;
    } else {
      checkCode = 10 - (sum2nd + sum3rd * 3) % 10;
    }

I could not google standard for this. only resources like this

Hi, I want to migrate this package to null safety but realized that it doesn't have any tests. I'm not familiar with barcode spec so added a simple golden test for BarCodeImage. If this seems good, I'm willing to add more golden tests (and github action workflows).

Thanks for the nice package 👍

The checksum calculations do not roll the weighting values, they just get bigger. Weighting for "C" checksum should be 1..20 1..20 1..20 etc Weighting for "K" checksum should be 1..15 1..15 1..15 etc see http://www.barcodeisland.com/code93.phtml

This is not the same as #15. That was a miscalculation of the canvas size required to paint the barcode value with the specified line width.

This issue occurs when the barcode widget is contained by a widget that is smaller than the calculated canvas size. In the example below, the barcode is in an Expanded widget between two SizedBox widgets. The code snippet below shows how the border around the canvas is applied.

    return Container(
      padding: EdgeInsets.all(8),
      decoration: BoxDecoration(
        color: Colors.red,
      ),
      child: BarCodeImage(
        data: "62733538535715976",
        codeType: BarCodeType.Code39,
        lineWidth: 2.5,
        barHeight: 150.0,
      ),
    );

So, rather than this, it would be better if the painter was aware of the actual width of canvas it has to work with and, if the canvas is too small, scale the barcode line width accordingly.

This branch contains fixes for the following issues... Barcode not centered #1 foregroundColor doesn't work #3 Barcode is rendered outside the canvas #13 Code93 barcode has extra bars on the end #14

This is a breaking change, due to the backgroundColor and foregroundColor support added, so the version is updated to 2.0.0 in pubspec.yaml

I also

• Changed the demo layout a little to make it more obvious what is being displayed.
• Removed "new" before all constructors as it is no longer required in Dart.
• Apologise for changes that are only for layout caused by auto format in Visual Studio Code.
• Renamed barcode_img.dart to barcode_image.dart to match your other conventions