Allow custom rotation in degrees, for backends that supports it (e.g. SVG)

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Author: VincentFoulon80

plotters-svg/src/svg.rs

@@ -8,12 +8,12 @@ use plotters_backend::{
     FontStyle, FontTransform,
 };
 
+use std::fmt::Write as _;
 use std::fs::File;
 #[allow(unused_imports)]
 use std::io::Cursor;
 use std::io::{BufWriter, Error, Write};
 use std::path::Path;
-use std::fmt::Write as _;
 
 fn make_svg_color(color: BackendColor) -> String {
     let (r, g, b) = color.rgb;
@@ -459,6 +459,9 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
             FontTransform::Rotate270 => {
                 attrs.push(("transform", format!("rotate(270, {}, {})", x0, y0)));
             }
+            FontTransform::RotateAngle(deg) => {
+                attrs.push(("transform", format!("rotate({deg}, {x0}, {y0})")))
+            }
             _ => {}
         }