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Fix inverted pen Y tilt on macOS and add tilt display to example

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- Negate tilt.y in Cocoa pen handling to correct inverted Y tilt axis
- Update drawing example to display X/Y tilt values for visualization
- see https://github.com/qt/qtbase/blob/0f128fd7c5a9ee721d1e631743f6eb61d927cf3b/src/plugins/platforms/cocoa/qnsview_tablet.mm#L63
- see https://source.chromium.org/chromium/chromium/src/+/main:components/input/web_input_event_builders_mac.mm;drc=0af5ffa1e4cc4cc4f818725f8fee93ec57855e4b;l=421
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Aki authored and Sam Lantinga committed 2025-01-29 22:09:02 -08:00
1 parent 31364477f2
commit 943579a545
2 files changed
+11 -1
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src/video/cocoa/SDL_cocoapen.m
+1 -1
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@@ -135,7 +135,7 @@ static void Cocoa_HandlePenPointEvent(SDL_CocoaWindowData *_data, NSEvent *event
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_PRESSURE, [event pressure]);
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_ROTATION, [event rotation]);
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_XTILT, ((float) tilt.x) * 90.0f);
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_YTILT, ((float) tilt.y) * 90.0f);
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_YTILT, ((float) -tilt.y) * 90.0f);
SDL_SendPenAxis(timestamp, pen, window, SDL_PEN_AXIS_TANGENTIAL_PRESSURE, event.tangentialPressure);
}