Sanmill icon indicating copy to clipboard operation
Sanmill copied to clipboard

Published 20 hours ago • verified publisher icon calcitem

LateInitializationError: Local 'blurPositionColor' has not been initialized.

Open calcitem opened this issue 1 year ago • 3 comments
trafficstars

An user's feedback.

Alse see:

https://github.com/calcitem/Sanmill/pull/421

https://github.com/calcitem/Sanmill/issues/646

Error:

LateInitializationError: Local 'blurPositionColor' has not been initialized.

Stack trace:

#0 LateError._throwLocalNotInitialized (dart:_internal-patch/internal_patch.dart:189)
#1 PiecePainter.paint (package:sanmill/game_page/widgets/painters/piece_painter.dart:157)
#2 RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:588)
#3 RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:635)
#4 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#5 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#6 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#7 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#8 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#9 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#10 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#11 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#12 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#13 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#14 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#15 _RenderLayoutBuilder.paint (package:flutter/src/widgets/layout_builder.dart:333)
#16 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#17 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#18 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2882)
#19 RenderFlex.paint (package:flutter/src/rendering/flex.dart:1040)
#20 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#21 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#22 _RenderSingleChildViewport.paint.paintContents (package:flutter/src/widgets/single_child_scroll_view.dart:538)
#23 _RenderSingleChildViewport.paint (package:flutter/src/widgets/single_child_scroll_view.dart:552)
#24 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#25 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:166)
#26 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:109)
#27 PaintingContext._compositeChild (package:flutter/src/rendering/object.dart:261)
#28 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:242)
#29 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#30 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#31 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#32 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#33 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#34 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#35 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#36 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#37 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#38 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#39 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#40 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#41 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#42 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#43 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#44 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#45 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#46 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#47 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#48 RenderTransform.paint (package:flutter/src/rendering/proxy_box.dart:2537)
#49 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#50 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#51 RenderClipRect.paint (package:flutter/src/rendering/proxy_box.dart:1541)
#52 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#53 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#54 RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:74)
#55 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#56 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#57 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#58 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#59 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#60 _RenderLayoutBuilder.paint (package:flutter/src/widgets/layout_builder.dart:333)
#61 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#62 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#63 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#64 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#65 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#66 _RenderLayoutBuilder.paint (package:flutter/src/widgets/layout_builder.dart:333)
#67 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#68 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#69 RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:74)
#70 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#71 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#72 RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:74)
#73 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#74 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#75 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2882)
#76 RenderStack.paintStack (package:flutter/src/rendering/stack.dart:640)
#77 RenderStack.paint (package:flutter/src/rendering/stack.dart:656)
#78 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#79 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#80 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2882)
#81 RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:408)
#82 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#83 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#84 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#85 _RenderInkFeatures.paint (package:flutter/src/material/material.dart:662)
#86 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#87 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#88 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#89 RenderPhysicalShape.paint.<anonymous closure> (package:flutter/src/rendering/proxy_box.dart:2156)
#90 PaintingContext.pushClipRRect (package:flutter/src/rendering/object.dart:575)
#91 RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:2030)
#92 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#93 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#94 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#95 RenderDecoratedBox.paint (package:flutter/src/rendering/proxy_box.dart:2295)
#96 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#97 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#98 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#99 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#100 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#101 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#102 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#103 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#104 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#105 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#106 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#107 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#108 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#109 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#110 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#111 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#112 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#113 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#114 RenderFractionalTranslation.paint (package:flutter/src/rendering/proxy_box.dart:2929)
#115 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#116 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#117 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2882)
#118 RenderStack.paintStack (package:flutter/src/rendering/stack.dart:640)
#119 RenderStack.paint (package:flutter/src/rendering/stack.dart:656)
#120 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#121 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#122 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#123 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#124 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#125 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#126 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#127 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250)
#128 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:129)
#129 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3208)
#130 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:166)
#131 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:109)
#132 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1156)
#133 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1166)
#134 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:593)
#135 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:986)
#136 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457)
#137 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325)
#138 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1255)
#139 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1113)
#140 _invoke (dart:ui/hooks.dart:312)
#141 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:383)
#142 _drawFrame (dart:ui/hooks.dart:283)


Application parameters:

environment: release
version: 4.0.3
appName: Mill
buildNumber: 3850
packageName: com.calcitem.sanmill


Custom parameters:

SkillLevel: setoption name SkillLevel value 1
MoveTime: setoption name MoveTime value 1
Algorithm: setoption name Algorithm value 2
UsePerfectDatabase: setoption name UsePerfectDatabase value false
PerfectDatabasePath: setoption name PerfectDatabasePath value /storage/emulated/0/Android/data/com.calcitem.sanmill/files/strong
DrawOnHumanExperience: setoption name DrawOnHumanExperience value false
ConsiderMobility: setoption name ConsiderMobility value false
AiIsLazy: setoption name AiIsLazy value false
Shuffling: setoption name Shuffling value false
DeveloperMode: setoption name DeveloperMode value false
PiecesCount: setoption name PiecesCount value 9
HasDiagonalLines: setoption name HasDiagonalLines value false
NMoveRule: setoption name NMoveRule value 100
EndgameNMoveRule: setoption name EndgameNMoveRule value 100
ThreefoldRepetitionRule: setoption name ThreefoldRepetitionRule value true
PiecesAtLeastCount: setoption name PiecesAtLeastCount value 3
HasBannedLocations: setoption name HasBannedLocations value false
BoardFullAction: setoption name BoardFullAction value 0
MayOnlyRemoveUnplacedPieceInPlacingPhase: setoption name MayOnlyRemoveUnplacedPieceInPlacingPhase value false
MayMoveInPlacingPhase: setoption name MayMoveInPlacingPhase value false
IsDefenderMoveFirst: setoption name IsDefenderMoveFirst value false
StalemateAction: setoption name StalemateAction value 0
MayFly: setoption name MayFly value true
FlyPieceCount: setoption name FlyPieceCount value 3
MayRemoveFromMillsAlways: setoption name MayRemoveFromMillsAlways value false
MayRemoveMultiple: setoption name MayRemoveMultiple value false
PositionFen: position fen O@O@O@O@/OOOO***@/****O*** b m s 9 0 5 0 0 0 0 15 moves (2,8)->(2,7) (2,4)->(2,5) 
MoveList: 1. d5 e5 2. e4 e3 3. d3 c3 4. c4 c5 5. d6 d7 6. f6 b6 7. f4 f2 8. g4xd7 d7 9. d2 d1 10. g4-g1 d1-a1 11. g1-d1xd7 a1-a4 12. d1-a1 a4-b4 13. a1-d1xf2 b4-a4 14. d2-f2xa4 b6-b4 15. f2-d2xb4

calcitem avatar Feb 09 '24 17:02 calcitem

错误信息表明在你的 PiecePainter.paint 方法中存在一个 LateInitializationError，具体是变量 blurPositionColor 没有被初始化就被使用了。这个错误发生在你尝试使用 blurPositionColor 来设置画笔颜色时，但是在你实际使用这个变量之前，它从未被赋值。

在你的代码中，blurPositionColor 被声明为 late，这意味着你在声明时没有初始化它，而是承诺在第一次使用前给它赋值。然而，如果在任何绘制逻辑触发之前 blurIndex 是 null 或者 piecesToDraw 中没有元素使得 blurPositionColor 被正确赋值，就会触发这个错误。

为了解决这个问题，你需要确保在使用 blurPositionColor 之前，它已经被赋予了一个有效的值。一个简单的解决方案是给 blurPositionColor 一个默认值，或者确保在绘制涉及 blurPositionColor 的任何图形之前，blurIndex 对应的逻辑已经成功赋值给了 blurPositionColor。例如，你可以在 for 循环里，当你知道将要用到 blurPositionColor 时，给它赋一个默认值或确保它被初始化：

// 在使用 blurPositionColor 之前提供一个默认值
Color blurPositionColor = Colors.transparent; // 或任何适当的默认颜色

for (final PiecePaintParam piece in piecesToDraw) {
    // 这里保持原有逻辑，当循环开始时，blurPositionColor 已经有了一个安全的值
    blurPositionColor = piece.piece.blurPositionColor;

    // 绘制逻辑保持不变...
}

此外，如果 blurIndex 可能为 null，你应该在尝试使用 blurPositionColor 绘制模糊位置之前，检查它是否已经被正确设置。如果你的逻辑依赖于特定条件（比如 blurIndex 不为 null）来初始化 blurPositionColor，请确保在那些条件未满足时有一个回退方案，比如设置一个默认颜色或跳过使用该变量的代码段。

这种处理方式确保了即使在 blurIndex 为 null 或者其他情况下没有为 blurPositionColor 赋值的情况下，你的代码也不会因为尝试使用一个未初始化的变量而崩溃。

calcitem avatar Feb 09 '24 17:02 calcitem

Let's break down the error you're encountering and how to fix it.

The Error: LateInitializationError

The error "LateInitializationError: Local 'blurPositionColor' has not been initialized" stems from a fundamental concept in Dart called late variables. Here's the breakdown:

  • Late Variables: In Dart, the keyword late allows you to declare a variable without immediately assigning a value to it. However, you must guarantee that this variable will be assigned a value before it is used for the first time. Otherwise, you'll encounter the LateInitializationError.

  • Your Code: The variable blurPositionColor within the paint method of your PiecePainter class has been declared with the late keyword:

    late Color blurPositionColor;

The Problem

The issue arises because you are attempting to use the blurPositionColor variable inside the for loop before giving it a value:

for (final PiecePaintParam piece in piecesToDraw) {
   // ... using blurPositionColor here ...
}

Since the assignment of blurPositionColor (based on piece.piece) takes place within the loop, there's a high chance that you'll run into situations where you try to use the variable before it's been assigned a value.

The Solution

Here are a couple of ways to resolve this error:

1. Initialize blurPositionColor with a Default Value:

Give the blurPositionColor variable an initial value when you declare it. This ensures that it is always initialized before you use it.

late Color blurPositionColor = Colors.transparent; // Or any sensible default color

2. Provide a Conditional Check:

Before using the blurPositionColor variable, check if it has been assigned a value. If not, either provide a default color or handle the situation differently.

for (final PiecePaintParam piece in piecesToDraw) {
   // ... 
   if (blurPositionColor == null) { 
       blurPositionColor = Colors.transparent; // Or appropriate handling
   }
   // ... use blurPositionColor ...
}

Choosing the Approach

The best solution depends on your specific use case:

  • If there's always a reasonable default color to use for blurPositionColor, then initializing with a default value is the cleanest way.

  • If the behavior needs to be different when blurPositionColor hasn't been assigned, go with the conditional check.

calcitem avatar Feb 10 '24 08:02 calcitem 

Application parameters:

environment: release
version: 4.0.3
appName: Mill
buildNumber: 3850
packageName: com.calcitem.sanmill


Custom parameters:

SkillLevel: setoption name SkillLevel value 4
MoveTime: setoption name MoveTime value 1
Algorithm: setoption name Algorithm value 2
UsePerfectDatabase: setoption name UsePerfectDatabase value true
PerfectDatabasePath: setoption name PerfectDatabasePath value /storage/emulated/0/Android/data/com.calcitem.sanmill/files/strong
DrawOnHumanExperience: setoption name DrawOnHumanExperience value true
ConsiderMobility: setoption name ConsiderMobility value true
AiIsLazy: setoption name AiIsLazy value false
Shuffling: setoption name Shuffling value true
DeveloperMode: setoption name DeveloperMode value false
PiecesCount: setoption name PiecesCount value 9
HasDiagonalLines: setoption name HasDiagonalLines value false
NMoveRule: setoption name NMoveRule value 100
EndgameNMoveRule: setoption name EndgameNMoveRule value 100
ThreefoldRepetitionRule: setoption name ThreefoldRepetitionRule value true
PiecesAtLeastCount: setoption name PiecesAtLeastCount value 3
HasBannedLocations: setoption name HasBannedLocations value false
BoardFullAction: setoption name BoardFullAction value 0
MayOnlyRemoveUnplacedPieceInPlacingPhase: setoption name MayOnlyRemoveUnplacedPieceInPlacingPhase value false
MayMoveInPlacingPhase: setoption name MayMoveInPlacingPhase value false
IsDefenderMoveFirst: setoption name IsDefenderMoveFirst value false
StalemateAction: setoption name StalemateAction value 0
MayFly: setoption name MayFly value true
FlyPieceCount: setoption name FlyPieceCount value 3
MayRemoveFromMillsAlways: setoption name MayRemoveFromMillsAlways value false
MayRemoveMultiple: setoption name MayRemoveMultiple value false
MoveList: 1. f4 d6 2. b4 d2 3. d7 a4 4. d3 g4 5. d1 e4 6. d5 c4 7. b6 b2 8. f2 f6 9. e5 c5 10. d3-c3 g4-g1 11. d1-a1 g1-g4 12. a1-d1 a4-a7 13. d1-a1 a7-a4 14. a1-d1
PositionFen: position fen ********/********/******** w p p 0 9 0 9 0 0 0 1 moves (2,3) (2,1) (2,7) (2,5) (3,1) (3,7) (1,5) (3,3) (3,5) (1,3) (1,1) (1,7) (2,8) (2,6) (2,4) (2,2) (1,2) (1,8) (1,5)->(1,6) (3,3)->(3,4) (3,5)->(3,6) (3,4)->(3,3) (3,6)->(3,5) (3,7)->(3,8) (3,5)->(3,6) (3,8)->(3,7)

calcitem avatar Feb 27 '24 15:02 calcitem