Add Arc and Pie Drawing and Plotting Features #4424
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| let stroke_color = match stroke.color { | ||
| ColorMode::Solid(color) => color, | ||
| ColorMode::UV(callback) => { | ||
| // We can't use the callback here, so we just use the center of the circle. |
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Maybe this behavior should be documented somewhere? I'm also not fully sure if you can't use the callback here, could you elaborate?
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The entire pie is rendered as a circle, but CircleShape is not compatible with PathStroke.
As a workaround, I use a callback to obtain the center color from PathStroke.
This issue should be addressed once CircleShape supports PathStroke.
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Ah, I understand. Thanks for elaborating!
Im hoping that the underlying ColorMode will be used for more shapes in the future, but for the time being it is only for paths. If you want, I can look into opening a PR to support PathStroke for more shapes
This commit introduces a new shape to the `epaint` library, named `ArcPieShape`. This shape represents an arc or a pie slice that can be rendered with specified radius, angle, fill, and stroke properties. It's useful for rendering pie charts, donut charts, and other circular data visualizations.
This commit adds `Painter::{arc, pie}` methods to `egui::Painter`.
These methods simplify the process of drawing arcs and pies.
This commit introduces three new plot types to the `egui_plot` library: `ArcLine`, `Pie`, and `PieChart`. - `ArcLine` is a plot that renders a simple arc line. - `Pie` is a plot that renders a single pie slice. - `PieChart` is a plot that renders a pie chart with data and labels.
…PieChart` This commit adds demonstrations for `ArcPieShape`, `ArcLine`, `Pie`, and `PieChart` to the `egui_demo_lib` library. These demos showcase how to use these new features in a variety of contexts.
…Pie(_)` with rayon
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Everything LGTM, I did have some performance concerns but eyeballing the frame render times in the standalone demo didn't justify benchmarks. Playing around with the demo you included, I wasn't able to break it visually, and I do think you already account for start and end angles that result in a full circle.
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Take a look to a bezier curve arc approximation methods, it could be faster(may be) https://docs.rs/bezier-nd/latest/bezier_nd/struct.Bezier.html#method.arc Example: https://github.com/enomado/smitters/blob/main/src/egui.rs#L6 |
It could also be more accurate, if you'd like an example, I have a duplicate PR: #4426 Side note: I probably should have caught this in my review. Sorry! |
Summary
This PR introduces several new features related to drawing and plotting arcs and pies in the
eguiecosystem.Changes
epaint: IntroducedArcPieShape, a new shape that represents an arc or a pie slice with specified radius, angle, fill, and stroke properties.egui: AddedPainter::{arc, pie}methods, which simplify the process of drawing arcs and pies.egui_plot: Introduced three new plot types:ArcLine,Pie, andPieChart.ArcLinerenders a simple arc line,Pierenders a single pie slice, andPieChartrenders a pie chart with data and labels.egui_demo_lib: Added demonstrations forArcPieShape,ArcLine,Pie, andPieChart. These demos showcase how to use these new features in a variety of contexts.Impact
These changes enhance the capabilities of the
eguiecosystem by providing users with more options for drawing and plotting.The new demos also serve as valuable examples for users to learn from.
screencast-egui_demo_app-2024-04-27.webm