第10篇 Matrix_Method 中的折叠布局有bug
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Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 20/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- android, java
- Domain
- computer-graphics, mobile-dev
Research direction
The issue names Android's setPolyToPoly() and a fold-layout reproduction, but no repository file or test. Start by reading the Android API documentation and reproducing the reported flip and clipping behavior; done would be a clear mathematical explanation of the transform and its boundary conditions.
Written by the indexing model from the issue text.
Description
这个issue仅用来讨论setPolytoPoly( )为什么会存在这个问题,虽然我通过发现问题出现规律把问题解决了,但是不明白其中的数学原理,还请高手指教,下面是问题:
我首先按照自己的想法实现了一下折叠布局, 发现折叠变形过大, 折叠中的某些格条会消失,我又去参考鸿洋的文章去实现,发现仍然存在这个问题:
(录屏中最下面的是解决问题后的, 倒数第二个是有问题的)
然后我只画出问题的格子,并把clip注掉, 我发现图片超出屏幕外一定程度图片就会翻转, 翻转后clip范围内没有图片了,所以看起来消失了.
我的解决方法是把图片根据clip大小截了, 在画图时把canvas坐标原点移动到最长的边使Y轴重合,保证图片变形时只会变小,不会变大超出屏幕.
问题就是为什么图片在使用setPolytoPoly( )时超出屏幕一定范围会翻转,它背后的原理是什么,欢迎大家讨论.
- Dominant language
- Java
- Stars
- 9.3k
- Forks
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- PR merge metrics
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