Revert "角度"

This reverts commit acfe44fd2e.

src/qelmt/arc.rs

@@ -4,18 +4,6 @@ use dxf::entities::LwPolyline;
 use hex_color::HexColor;
 use simple_xml_builder::XMLElement;
 
-fn normalize_angle(angle: f64) -> f64 {
-    let mut norm = angle % 360.0;
-    if norm < 0.0 {
-        norm += 360.0;
-    }
-    norm
-}
-
-fn qet_start_angle(angle: f64) -> f64 {
-    normalize_angle(270.0 - angle)
-}
-
 #[derive(Debug)]
 pub struct Arc {
     //need to brush up on my Rust scoping rules, isn't there a way to make this pub to just the module?
@@ -86,7 +74,7 @@ impl Arc {
             y: -arc.center.y - arc.radius,
             height: arc.radius * 2.0,
             width: arc.radius * 2.0,
-            start: qet_start_angle(normalize_angle(start_angle)),
+            start: if start_angle < 0.0 { -start_angle } else { start_angle },
             angle: if angle_span < 0.0 { -angle_span } else { angle_span },
 
             //in the original code antialias is always set to false...I'm guessing for performance
@@ -287,8 +275,18 @@ impl Arc {
             (start_y_qet - center_y_qet).atan2(start.0 - center_x).to_degrees();
         let mut end_angle = (end_y_qet - center_y_qet).atan2(end.0 - center_x).to_degrees();
 
-        start_angle = normalize_angle(start_angle);
-        end_angle = normalize_angle(end_angle);
+        let normalize = |mut angle: f64| {
+            while angle < 0.0 {
+                angle += 360.0;
+            }
+            while angle >= 360.0 {
+                angle -= 360.0;
+            }
+            angle
+        };
+
+        start_angle = normalize(start_angle);
+        end_angle = normalize(end_angle);
 
         let ccw_sweep = (end_angle - start_angle).rem_euclid(360.0);
         let cw_sweep = (start_angle - end_angle).rem_euclid(360.0);
@@ -307,8 +305,6 @@ impl Arc {
             return Err("Arc sweep too small".into());
         }
 
-        let start_angle = qet_start_angle(start_angle);
-
         Ok(Arc {
             x: center_x - radius,
             y: center_y_qet - radius,