nannou_draw 0.20.0

A simple and expressive API for drawing 2D and 3D graphics, built on Bevy for nannou - the creative-coding framework.
Documentation 
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use bevy::prelude::*;
use lyon::path::PathEvent;
use lyon::tessellation::{FillTessellator, StrokeTessellator};

use crate::draw;

/// Draw API primitives that may be rendered via the **Renderer** type.
pub trait RenderPrimitive {
    /// Render self into the given mesh.
    fn render_primitive(self, ctxt: RenderContext, mesh: &mut Mesh);
}

/// The context provided to primitives to assist with the rendering process.
pub struct RenderContext<'a> {
    pub transform: &'a Mat4,
    pub intermediary_mesh: &'a Mesh,
    pub path_event_buffer: &'a [PathEvent],
    pub path_points_vertex_buffer: &'a [(Vec2, Color, Vec2)],
    pub text_buffer: &'a str,
    pub theme: &'a draw::Theme,
    pub fill_tessellator: &'a mut FillTessellator,
    pub stroke_tessellator: &'a mut StrokeTessellator,
    pub output_attachment_size: Vec2, // logical coords
    pub output_attachment_scale_factor: f32,
}

/// The position and dimensions of the scissor.
#[derive(Clone, Copy, Debug, PartialEq)]
#[allow(dead_code)]
pub struct Scissor {
    pub left: u32,
    pub bottom: u32,
    pub width: u32,
    pub height: u32,
}

impl RenderPrimitive for draw::Primitive {
    fn render_primitive(self, ctxt: RenderContext, mesh: &mut Mesh) {
        match self {
            draw::Primitive::Arrow(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Mesh(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Path(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Polygon(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Tri(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Ellipse(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Quad(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Rect(prim) => prim.render_primitive(ctxt, mesh),
            draw::Primitive::Line(prim) => prim.render_primitive(ctxt, mesh),
            // `Text` is handled by the renderer directly (it renders as quads
            // textured by the glyph atlas rather than into the shared mesh), so it
            // falls through to the catch-all here, e.g. for instanced/indirect
            // commands where atlas-textured text is not supported.
            _ => {}
        }
    }
}