Implement basic circle stamping (#53)

core/document/src/lib.rs

@@ -1,7 +1,27 @@
-#[cfg(test)]
-mod tests {
-	#[test]
-	fn it_works() {
-		assert_eq!(2 + 2, 4);
+pub use kurbo::{Circle, Point};
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum SvgElement {
+	Circle(Circle),
+}
+
+impl SvgElement {
+	pub fn render(&self) -> String {
+		match self {
+			Self::Circle(c) => {
+				format!(r#"<circle cx="{}" cy="{}" r="{}" style="fill: #fff;" />"#, c.center.x, c.center.y, c.radius)
+			}
+		}
+	}
+}
+
+#[derive(Default, Debug, Clone, PartialEq)]
+pub struct Document {
+	pub svg: Vec<SvgElement>,
+}
+
+impl Document {
+	pub fn render(&self) -> String {
+		self.svg.iter().map(|element| element.render()).collect::<Vec<_>>().join("\n")
 	}
 }