* add plot legends
* don't show crosshairs when hovering over legend
* add a toggle for the legend
* changes based on review
* improve legend behavior when curves share names
* translate touch events from glium to egui
Unfortunately, winit does not seem to create _Touch_ events for the touch pad
on my mac. Only _TouchpadPressure_ events are sent.
Found some issues (like
[this](https://github.com/rust-windowing/winit/issues/54)), but I am not sure
what they exactly mean: Sometimes, touch events are mixed with
touch-to-pointer translation in the discussions.
* translate touch events from web_sys to egui
The are a few open topics:
- egui_web currently translates touch events into pointer events.
I guess this should change, such that egui itself performs this kind of
conversion.
- `pub fn egui_web::pos_from_touch_event` is a public function, but I
would like to change the return type to an `Option`. Shouldn't this
function be private, anyway?
* introduce `TouchState` and `Gesture`
InputState.touch was introduced with type `TouchState`, just as
InputState.pointer is of type `Pointer`.
The TouchState internally relies on a collection of `Gesture`s. This commit
provides the first rudimentary implementation of a Gesture, but has no
functionality, yet.
* add method InputState::zoom()
So far, the method always returns `None`, but it should work as soon as the
`Zoom` gesture is implemented.
* manage one `TouchState` per individual device
Although quite unlikely, it is still possible to connect more than one touch
device. (I have three touch pads connected to my MacBook in total, but
unfortunately `winit` sends touch events for none of them.)
We do not want to mix-up the touches from different devices.
* implement control loop for gesture detection
The basic idea is that each gesture can focus on detection logic and does not
have to care (too much) about managing touch state in general.
* streamline `Gesture` trait, simplifying impl's
* implement first version of Zoom gesture
* fix failing doctest
a simple `TODO` should be enough
* get rid of `Gesture`s
* Provide a Zoom/Rotate window in the demo app
For now, it works for two fingers only. The third finger interrupts the
gesture.
Bugs:
- Pinching in the demo window also moves the window -> Pointer events must be
ignored when touch is active
- Pinching also works when doing it outside the demo window -> it would be nice
to return the touch info in the `Response` of the painter allocation
* fix comments and non-idiomatic code
* update touch state *each frame*
* change egui_demo to use *relative* touch data
* support more than two fingers
This commit includes an improved Demo Window for egui_demo, and a complete
re-write of the gesture detection. The PR should be ready for review, soon.
* cleanup code and comments for review
* minor code simplifications
* oops – forgot the changelog
* resolve comment fee8ed83db (r623226656)
* accept suggestion https://github.com/emilk/egui/pull/306#discussion_r623229228
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
* fix syntax error (dough!)
* remove `dbg!` (why didnt clippy see this?)
* apply suggested diffs from review
* fix conversion of physical location to Pos2
* remove redundanct type `TouchAverages`
* remove trailing space
* avoid initial translation jump in plot demo
* extend the demo so it shows off translation
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
* Replace `impl Into<String>` with `impl ToString`
This is something I ran into today. Types that implement
`std::fmt::Display` cannot be passed to functions that take `impl
Into<String>`. You have to call `display_thing.to_string()`. Its a small
thing but would be fixed by instead taking `impl ToString`.
Afaik `impl ToString` is a superset of `impl Into<String>`, unless users
manually implement `Into<String> for T` (or `From<T> for String`) for
their own types. However I think its more common to implement `Display`
as that works with `println` and friends. The main difference is that
`Display::fmt` can return errors but thats also quite rare in my
experience.
I did some testing in a [playground] and seems to work.
[playground]: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1111e071f6ae416ae2688d58d2e9b575
* Silence warnings
This adds a new `zoom_delta` to input.
This is hooked up to ctrl-scroll on egui_web and egui_glium.
Browsers convert trackpad pinch gestures to ctrl-scroll,
so this means you can not pinch-to-zoom plots (on trackpad).
In the future we can support multitouch pinch-to-zoom via the same
`InputState::zoom_factor()` function
* drag and zoom support for plots
* update doctest
* use impl ToString
* revert back to Into<String> until #302 is solved
* Apply suggestions from code review
Co-authored-by: ilya sheprut <optitel223@gmail.com>
* use persistence feature for PlotMemory
* * split plot into multiple files
* add curve from function
* move more functionality into ScreenTransform struct
* changes from code review in base branch
* let user specify a range for generated functions
* rename file
* minor changes
* improve generator functionality
* improve callback and add parametric callback
* minor changes
* add documentation
* fix merge issues
* changes based on review
* rename folder
* make plot.rs the mod.rs file
* remove mod.rs
* rename file
* namespace changes
* fix doctest
* Update egui/src/widgets/plot/items.rs
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Co-authored-by: ilya sheprut <optitel223@gmail.com>
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
