Open calcitem opened 7 months ago
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。
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.
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)
An user's feedback.
Alse see:
https://github.com/calcitem/Sanmill/pull/421
https://github.com/calcitem/Sanmill/issues/646