GraphiteEditor/Graphite

Bug: Offset while using brush tool on iPad

Open

#3,286 建立於 2025年10月14日

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 (11 留言) (0 反應) (0 負責人)Rust (25,662 star) (1,176 fork)batch import
Good First Issue

描述

Description

  • Large offset while using the web version on iPad.
  • Using the apple pencil to draw with the brush tool on the iPad surface, there is a large noticable offset of the ink appearing from the tip of the pencil touching the screen.
  • The brush ink also flows outside of the artboard (although I suspect this might be by desgin)

Video Demonstration

https://drive.google.com/file/d/1buYIvX035Be9K-pn0Rn7eCGvYZ4jJTX1/view?usp=sharing

Other details

  • Safari version: 26
  • iOS version: iPadOS 26.0
  • iPad model: iPad Pro 13 inch, 2024

Preliminary thoughts

貢獻者指南

技術棧
rustwasmhtmlcss
領域
frontend
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
RustCoordinate geometryTouch events
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
60
研究方向
Investigate the coordinate transformation chain from touch input to canvas coordinates in the brush tool.rs file (editor/src/messages/tool/tool messages/brush tool.rs). Check if the offset is due to device pixel ratio mismatch or coordinate origin differences. Refer to the preliminary thoughts in the issue for clues. Test with iPad Safari to reproduce and compare coordinates.