Allow Into conversions on style arguments

Author: milliams

examples/scatter_svg.rs

@@ -4,9 +4,9 @@ fn main() {
     let data = [(-3.0, 2.3), (-1.6, 5.3), (0.3, 0.7), (4.3, -1.4), (6.4, 4.3), (8.5, 3.7)];
     let s1 = plotlib::scatter::Scatter::from_vec(&data).style(plotlib::scatter::Style::new()
         .marker(plotlib::scatter::Marker::Square)
-        .colour("#DD3355".into()));
+        .colour("#DD3355"));
     let s2 = plotlib::scatter::Scatter::from_vec(&[(-1.4, 2.5), (7.2, -0.3)])
-        .style(plotlib::scatter::Style::new().colour("#35C788".into()));
+        .style(plotlib::scatter::Style::new().colour("#35C788"));
     let v = plotlib::view::View::new()
         .add(&s1)
         .add(&s2)

src/scatter.rs

@@ -43,8 +43,8 @@ impl Style {
         }
     }
 
-    pub fn marker(mut self, value: Marker) -> Self {
-        self.marker = Some(value);
+    pub fn marker<T>(mut self, value: T) -> Self where T: Into<Marker> {
+        self.marker = Some(value.into());
         self
     }
 
@@ -55,8 +55,8 @@ impl Style {
         }
     }
 
-    pub fn colour(mut self, value: String) -> Self {
-        self.colour = Some(value);
+    pub fn colour<T>(mut self, value: T) -> Self where T: Into<String> {
+        self.colour = Some(value.into());
         self
     }