# 壹、Apple Pencil技術研究 ## 原先程式測試 ## 相關資料/連結 ![](https://hackmd.io/_uploads/rkTh-01th.png) ![](https://hackmd.io/_uploads/Hk0T-0Jt2.png) * [pencil_kit 1.0.4套件](https://pub.dev/packages/pencil_kit) * [Github討論區](https://github.com/flutter/flutter/issues/38135) * [performance issue in drawing app](https://stackoverflow.com/questions/50132188/performance-issue-in-drawing-using-flutter) -->The performance issue in drawing app using flutter is resolved by using drawPath() and instead of using setState for each points to update use NotifyListener() to refresh than it will be more efficient than setState. * [重新創作flutter筆刷](https://www.kodeco.com/25237210-building-a-drawing-app-in-flutter) * [calender drawing use flutter OPensource](https://github.com/AlexanderThiele/stift_flutter_app)