Output SVG groups that work as layers in Inkscape

tue-alga · Oct 4, 2024 · 55f6ce6 · 55f6ce6
1 parent 2be8220
commit 55f6ce6
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Showing 2 changed files with 10 additions and 2 deletions.
diff --git a/cartocrow/renderer/svg_renderer.cpp b/cartocrow/renderer/svg_renderer.cpp
@@ -51,7 +51,11 @@ void SvgRenderer::save(const std::filesystem::path& file) {
 	m_out << "<defs><circle id=\"vertex\" cx=\"0\" cy=\"0\" r=\"4\"/></defs>\n";
 
 	for (auto painting : m_paintings) {
-		m_out << "<g>\n";
+		m_out << "<g inkscape:groupmode=\"layer\"";
+		if (painting.name) {
+			m_out << " inkscape:label=\"" << *painting.name << "\"";
+		}
+		m_out << ">\n";
 		pushStyle();
 		painting.m_painting->paint(*this);
 		popStyle();

diff --git a/cartocrow/renderer/svg_renderer.h b/cartocrow/renderer/svg_renderer.h
@@ -100,7 +100,11 @@ class SvgRenderer : public GeometryRenderer {
 	struct DrawnPainting {
 		/// The painting itself.
 		std::shared_ptr<GeometryPainting> m_painting;
-		/// The name of the painting displayed as a layer name in ipe.
+		/// The name of the painting displayed as a layer name in Inkscape.
+		///
+		/// The SVG standard does not have a concept of layers, however Inkscape
+		/// does support them by means of groups with the custom inkscape:label
+		/// attribute.
 		std::optional<std::string> name;
 	};