Trait bevy_prototype_lyon::geometry::Geometry

source · 
pub trait Geometry {
    // Required method
    fn add_geometry(&self, b: &mut Builder);
}
Expand description

Structs that implement this trait can be drawn as a shape. See the shapes module for some examples.

§Implementation example

use bevy_prototype_lyon::geometry::Geometry;
use lyon_tessellation::{
    math::{Box2D, Point, Size},
    path::{path::Builder, traits::PathBuilder, Path, Winding},
};

// First, create a struct to hold the shape features:
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Rectangle {
    pub width: f32,
    pub height: f32,
}

// Implementing the `Default` trait is not required, but it may facilitate the
// definition of the shape before spawning it.
impl Default for Rectangle {
    fn default() -> Self {
        Self {
            width: 1.0,
            height: 1.0,
        }
    }
}

// Finally, implement the `add_geometry` method.
impl Geometry for Rectangle {
    fn add_geometry(&self, b: &mut Builder) {
        b.add_rectangle(
            &Box2D::new(Point::zero(), Point::new(self.width, self.height)),
            Winding::Positive,
        );
    }
}

Required Methods§

source

fn add_geometry(&self, b: &mut Builder)

Adds the geometry of the shape to the given Lyon path Builder.

Implementors§