fixed font rendering in svg

reaction_systems_gui/Cargo.toml

@@ -15,6 +15,7 @@ colored = "*"
 lalrpop-util = "*"
 petgraph = ">=0.8"
 resvg = "*"
+fontdb = "*"
 dyn-clone = "*"
 petgraph-graphml = "*"
 egui_node_graph2 = { path = "../egui_node_graph2" }

reaction_systems_gui/src/app.rs

@@ -1981,7 +1981,7 @@ impl eframe::App for AppHandle {
                     );
                     if let Err(e) = err {
                         let text = get_layout(Err(e), &self.translator.lock().unwrap(), ctx);
-                        self.cached_last_value = Some(content.clone());
+                        self.cached_last_value = Some(text);
                     } else if let Some(l_b_v) = self.cache.get_last_state() {
                         if let BasicValue::SaveBytes { path, value } = &l_b_v {
                             use std::io::Write;
@@ -1992,7 +1992,7 @@ impl eframe::App for AppHandle {
                                     return;
                                 }
                             };
-                            if let Err(e) = write!(f, "{}", value) {
+                            if let Err(e) = f.write_all(value) {
                                 println!("Error writing to file {path}: {e}");
                                 return;
                             }

reaction_systems_gui/src/svg.rs

@@ -21,6 +21,9 @@ pub(crate) struct Svg {
 
 impl Svg {
     pub(crate) fn parse_dot_string(dot_str: &str) -> Result<Svg, String> {
+        let mut fontdb = fontdb::Database::new();
+        fontdb.load_system_fonts();
+
         let mut parser = gv::DotParser::new(dot_str);
         let g = match parser.process() {
             Ok(g) => g,
@@ -41,7 +44,15 @@ impl Svg {
         );
         let content = svg.finalize();
 
-        let svg_tree = match resvg::usvg::Tree::from_str(&content, &resvg::usvg::Options::default()) {
+        let svg_tree = match resvg::usvg::Tree::from_str(
+            &content,
+            &resvg::usvg::Options {
+                dpi: 92.,
+                font_family: "Andale Mono".into(),
+                fontdb: Arc::new(fontdb),
+                ..Default::default()
+            }
+        ) {
             Ok(svg) => svg,
             Err(err) => return Err(format!("{}", err)),
         };
@@ -77,7 +88,14 @@ impl Svg {
     }
 
     pub(crate) fn rasterize(&self) -> Result<Vec<u8>, String> {
-        let svg_tree = match resvg::usvg::Tree::from_str(&self.original, &resvg::usvg::Options::default()) {
+        let svg_tree = match resvg::usvg::Tree::from_str(
+            &self.original,
+            &resvg::usvg::Options {
+                dpi: 92.,
+                font_family: "Andale Mono".into(),
+                ..Default::default()
+            }
+        ) {
             Ok(svg) => svg,
             Err(err) => return Err(format!("{}", err)),
         };