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This changes the `Scene` behaviour to call `set_transform_layer` prior to calling the user content fn, rather than after. ### Motivation This provides a simple way for the user to access the `TSTransform` that will be applied to the `Scene` within the user content function, e.g. ```rust ui.ctx().layer_transform_to_global(ui.layer_id()) ``` Previously getting the transform like this still kind of worked, but resulted in the user content lagging behind the actual scene position by a single frame, which looks a bit strange. With this PR, the user content using the transform no longer lags by a frame, and matches the scene's transform perfectly. Accessing the `TSTransform` of the `Scene` within the user content function is useful for the case where the user may want to instantiate new `Ui` sublayers that also track the scene (by default, sublayers do *not* apply the same transform as the scene, likely the cause of #5682). With these changes, the user can have sublayers track the scene like so: ```rust let scene_layer = ui.layer_id(); let sub_layer = egui::LayerId::new(scene_layer.order, self.id); ui.ctx().set_sublayer(scene_layer, sub_layer); let scene_transform = ui.ctx().layer_transform_to_global(scene_layer).unwrap(); ui.ctx().set_transform_layer(sub_layer, scene_transform); ``` ### Tested with - `egui_demo_app` scene example. - Local `egui_graph` demo example. --- <!-- Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/master/CONTRIBUTING.md) before opening a Pull Request! * Keep your PR:s small and focused. * The PR title is what ends up in the changelog, so make it descriptive! * If applicable, add a screenshot or gif. * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`, or a new example. * Do NOT open PR:s from your `master` branch, as that makes it hard for maintainers to test and add commits to your PR. * Remember to run `cargo fmt` and `cargo clippy`. * Open the PR as a draft until you have self-reviewed it and run `./scripts/check.sh`. * When you have addressed a PR comment, mark it as resolved. Please be patient! I will review your PR, but my time is limited! --> * Closes <https://github.com/emilk/egui/issues/THE_RELEVANT_ISSUE> * [x] I have followed the instructions in the PR template |
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README.md
GUI implementation
This is the core library crate egui. It is fully platform independent without any backend. You give the egui library input each frame (mouse pos etc), and it outputs a triangle mesh for you to paint.