feat(emitter): a radial particle field with a closed-form lifecycle

README.md

@@ -2141,7 +2141,7 @@ Transparency is supported with `--transparent` for PNG sequences, WebM (VP9), an
 - **JSON Schema:** schemars (auto-generated from Rust types)
 - **Parallelism:** rayon (multi-threaded frame rendering)
 
-rustmotion ships 60 components, each implementing the `Painter` trait, through a CSS-inspired **box_tree → layout_pass → paint_pass** pipeline:
+rustmotion ships 61 components, each implementing the `Painter` trait, through a CSS-inspired **box_tree → layout_pass → paint_pass** pipeline:
 
 1. **box_tree** — builds a tree of `BoxNode { css: CssStyle, children, intrinsic }` from the resolved JSON components
 2. **layout_pass** — runs [taffy](https://github.com/DioxusLabs/taffy) to compute each node's `BoxLayout { x, y, width, height }`; leaves that carry an `IntrinsicMeasure` (text, images, codeblocks, ...) are measured through a `measure_fn`

crates/rustmotion-components/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rustmotion-components"
 version.workspace = true
 edition = "2021"
-description = "Component library for rustmotion (60 components)"
+description = "Component library for rustmotion (61 components)"
 license = "MIT"
 repository = "https://github.com/LeadcodeDev/rustmotion"
 readme = "../../README.md"

crates/rustmotion-components/src/box_builder.rs

@@ -1410,6 +1410,14 @@ fn apply_intrinsic_overrides(component: &Component, css: &mut CssStyle) {
                 css.height = Some(CSize::Length(CLP::String("100%".into())));
             }
         }
+        Emitter(_) => {
+            if css.width.is_none() {
+                css.width = Some(CSize::Length(CLP::String("100%".into())));
+            }
+            if css.height.is_none() {
+                css.height = Some(CSize::Length(CLP::String("100%".into())));
+            }
+        }
         Switch(c) => {
             if css.width.is_none() {
                 css.width = Some(CSize::Length(CLP::Px(c.width)));
@@ -1805,6 +1813,7 @@ fn component_style(c: &Component) -> &CssStyle {
         Countdown(c) => &c.style,
         Divider(c) => &c.style,
         DotMap(c) => &c.style,
+        Emitter(c) => &c.style,
         Gauge(c) => &c.style,
         GradientText(c) => &c.style,
         Heatmap(c) => &c.style,
@@ -1864,6 +1873,7 @@ pub fn component_kind(c: &Component) -> &'static str {
         Countdown(_) => "countdown",
         Divider(_) => "divider",
         DotMap(_) => "dot_map",
+        Emitter(_) => "emitter",
         Gauge(_) => "gauge",
         GradientText(_) => "gradient_text",
         Heatmap(_) => "heatmap",