egui/crates/epaint/src/shapes/circle_shape.rs

use crate::{Color32, Pos2, Rect, Shape, Stroke, Vec2};

/// How to paint a circle.
#[derive(Copy, Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct CircleShape {
    pub center: Pos2,
    pub radius: f32,
    pub fill: Color32,
    pub stroke: Stroke,
}

impl CircleShape {
    #[inline]
    pub fn filled(center: Pos2, radius: f32, fill_color: impl Into<Color32>) -> Self {
        Self {
            center,
            radius,
            fill: fill_color.into(),
            stroke: Default::default(),
        }
    }

    #[inline]
    pub fn stroke(center: Pos2, radius: f32, stroke: impl Into<Stroke>) -> Self {
        Self {
            center,
            radius,
            fill: Default::default(),
            stroke: stroke.into(),
        }
    }

    /// The visual bounding rectangle (includes stroke width)
    pub fn visual_bounding_rect(&self) -> Rect {
        if self.fill == Color32::TRANSPARENT && self.stroke.is_empty() {
            Rect::NOTHING
        } else {
            Rect::from_center_size(
                self.center,
                Vec2::splat(self.radius * 2.0 + self.stroke.width),
            )
        }
    }
}

impl From<CircleShape> for Shape {
    #[inline(always)]
    fn from(shape: CircleShape) -> Self {
        Self::Circle(shape)
    }
}