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Issues if canvas is scaled #9

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CodeDoctorDE opened this issue Sep 22, 2022 · 3 comments
Open

Issues if canvas is scaled #9

CodeDoctorDE opened this issue Sep 22, 2022 · 3 comments

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@CodeDoctorDE
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CodeDoctorDE commented Sep 22, 2022 •
edited

If you have a scaled canvas, there are issues.
brave_Hc8vpBigBv
see https://butterfly-lhuv8bd8w-linwood.vercel.app/ (click on the pen painter, enable "zoom dependent" and zoom in a lot).
grafik

See here: https://github.com/LinwoodCloud/Butterfly/blob/c97a86e8080ea62183033abeae1b48011c0b9a3f/app/lib/renderers/elements/path.dart#L50
@CodeDoctorDE
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@steveruizok maybe it has something to do with the steps: https://github.com/steveruizok/perfect-freehand-dart/blob/main/lib/src/get_stroke_outline_points.dart#L164
On a scaled canvas, the steps are bigger.

@adil192 adil192 mentioned this issue Dec 29, 2022
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@CodeDoctorDE
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This happens on all platform for me

@CodeDoctorDE
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@steveruizok Excalidraw has also the issue if zooming in and trying to draw freehand. https://excalidraw.com/

adil192 added a commit that referenced this issue Feb 6, 2024
@adil192
fix: error when lerping NaN points
199ffce 
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: 'dart:ui/lerp.dart': Failed assertion: line 19 pos 10: '<optimized out>': Cannot interpolate between finite and non-finite values
#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:51:61)
#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:40:5)
#2      lerpDouble (dart:ui/lerp.dart:19:10)
#3      PointVector.lerp (package:perfect_freehand/src/types/point_vector.dart:54:7)
#4      getStrokeOutlinePoints (package:perfect_freehand/src/get_stroke_outline_points.dart:238:31)
#5      getStroke (package:perfect_freehand/src/get_stroke.dart:19:10)
#6      Stroke._getPolygon (package:saber/components/canvas/_stroke.dart:200:21)
#7      Stroke._updatePolygon (package:saber/components/canvas/_stroke.dart:48:16)
#8      Stroke.polygon (package:saber/components/canvas/_stroke.dart:38:32)
#9      Stroke.toSvgPath (package:saber/components/canvas/_stroke.dart:247:9)
#10     EditorExporter.generatePdf.<anonymous closure>.<anonymous closure> (package:saber/data/editor/editor_exporter.dart:111:52)
#11     CustomPaint.paint (package:pdf/src/widgets/basic.dart:623:25)
#12     SingleChildWidget.paintChild (package:pdf/src/widgets/widget.dart:320:14)
#13     ConstrainedBox.paint (package:pdf/src/widgets/basic.dart:449:5)
#14     StatelessWidget.paint (package:pdf/src/widgets/widget.dart:260:15)
#15     Page.paint (package:pdf/src/widgets/page.dart:246:13)
#16     Page.postProcess (package:pdf/src/widgets/page.dart:179:5)
#17     Document.save (package:pdf/src/widgets/document.dart:130:14)
#18     EditorState.exportAsPdf (package:saber/pages/editor/editor.dart:1213:72)
<asynchronous suspension>
#19     _ExportBarState._onPressed.<anonymous closure>.<anonymous closure> (package:saber/components/toolbar/export_bar.dart:38:29)
<asynchronous suspension>
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