New node: Assign Colors (#1938)

* New node: Assign Colors

* Simplify the Procedural String Lights demo artwork

* Add "Group" node to the node catalog

* Better comment styling in profiling action

node-graph/gcore/src/graphic_element.rs

@@ -55,6 +55,22 @@ impl core::hash::Hash for GraphicGroup {
 	}
 }
 
+impl GraphicGroup {
+	pub const EMPTY: Self = Self {
+		elements: Vec::new(),
+		transform: DAffine2::IDENTITY,
+		alpha_blending: AlphaBlending::new(),
+	};
+
+	pub fn new(elements: Vec<GraphicElement>) -> Self {
+		Self {
+			elements,
+			transform: DAffine2::IDENTITY,
+			alpha_blending: AlphaBlending::new(),
+		}
+	}
+}
+
 /// The possible forms of graphical content held in a Vec by the `elements` field of [`GraphicElement`].
 /// Can be another recursively nested [`GraphicGroup`], a [`VectorData`] shape, an [`ImageFrame`], or an [`Artboard`].
 #[derive(Clone, Debug, Hash, PartialEq, DynAny)]
@@ -74,6 +90,50 @@ impl Default for GraphicElement {
 	}
 }
 
+impl GraphicElement {
+	pub fn as_group(&self) -> Option<&GraphicGroup> {
+		match self {
+			GraphicElement::GraphicGroup(group) => Some(group),
+			_ => None,
+		}
+	}
+
+	pub fn as_group_mut(&mut self) -> Option<&mut GraphicGroup> {
+		match self {
+			GraphicElement::GraphicGroup(group) => Some(group),
+			_ => None,
+		}
+	}
+
+	pub fn as_vector_data(&self) -> Option<&VectorData> {
+		match self {
+			GraphicElement::VectorData(data) => Some(data),
+			_ => None,
+		}
+	}
+
+	pub fn as_vector_data_mut(&mut self) -> Option<&mut VectorData> {
+		match self {
+			GraphicElement::VectorData(data) => Some(data),
+			_ => None,
+		}
+	}
+
+	pub fn as_raster(&self) -> Option<&Raster> {
+		match self {
+			GraphicElement::Raster(raster) => Some(raster),
+			_ => None,
+		}
+	}
+
+	pub fn as_raster_mut(&mut self) -> Option<&mut Raster> {
+		match self {
+			GraphicElement::Raster(raster) => Some(raster),
+			_ => None,
+		}
+	}
+}
+
 #[derive(Clone, Debug, Hash, PartialEq, DynAny)]
 pub enum Raster {
 	/// A bitmap image with a finite position and extent, equivalent to the SVG <image> tag: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/image
@@ -301,11 +361,3 @@ where
 		}
 	}
 }
-
-impl GraphicGroup {
-	pub const EMPTY: Self = Self {
-		elements: Vec::new(),
-		transform: DAffine2::IDENTITY,
-		alpha_blending: AlphaBlending::new(),
-	};
-}