Update example in readme

Author: milliams

README.md

@@ -24,13 +24,13 @@ For example, code like:
 
 ```rust
 use plotlib::page::Page;
-use plotlib::repr::Scatter;
+use plotlib::repr::Plot;
 use plotlib::view::ContinuousView;
 use plotlib::style::{PointMarker, PointStyle};
 
 fn main() {
     // Scatter plots expect a list of pairs
-    let data1 = [
+    let data1 = vec![
         (-3.0, 2.3),
         (-1.6, 5.3),
         (0.3, 0.7),
@@ -40,15 +40,15 @@ fn main() {
     ];
 
     // We create our scatter plot from the data
-    let s1: Scatter = Scatter::from_slice(&data1).style(
+    let s1: Plot = Plot::new(data1).point_style(
         PointStyle::new()
             .marker(PointMarker::Square) // setting the marker to be a square
             .colour("#DD3355"),
     ); // and a custom colour
 
     // We can plot multiple data sets in the same view
-    let data2 = [(-1.4, 2.5), (7.2, -0.3)];
-    let s2: Scatter = Scatter::from_slice(&data2).style(
+    let data2 = vec![(-1.4, 2.5), (7.2, -0.3)];
+    let s2: Plot = Plot::new(data2).point_style(
         PointStyle::new() // uses the default marker
             .colour("#35C788"),
     ); // and a different colour

examples/scatter_svg.rs

@@ -1,26 +1,34 @@
 use plotlib::page::Page;
 use plotlib::repr::Plot;
-use plotlib::style::{PointMarker, PointStyle};
 use plotlib::view::ContinuousView;
+use plotlib::style::{PointMarker, PointStyle};
 
 fn main() {
-    let data = vec![
+    // Scatter plots expect a list of pairs
+    let data1 = vec![
         (-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 = Plot::new(data).point_style(
+
+    // We create our scatter plot from the data
+    let s1: Plot = Plot::new(data1).point_style(
         PointStyle::new()
-            .marker(PointMarker::Square)
-            .colour("burlywood")
-            .size(2.),
-    );
-    let s2 = Plot::new(vec![(-1.4, 2.5), (7.2, -0.3)])
-        .point_style(PointStyle::new().colour("darkseagreen"));
+            .marker(PointMarker::Square) // setting the marker to be a square
+            .colour("#DD3355"),
+    ); // and a custom colour
+
+    // We can plot multiple data sets in the same view
+    let data2 = vec![(-1.4, 2.5), (7.2, -0.3)];
+    let s2: Plot = Plot::new(data2).point_style(
+        PointStyle::new() // uses the default marker
+            .colour("#35C788"),
+    ); // and a different colour
 
+    // The 'view' describes what set of data is drawn
     let v = ContinuousView::new()
         .add(s1)
         .add(s2)
@@ -29,5 +37,6 @@ fn main() {
         .x_label("Some varying variable")
         .y_label("The response of something");
 
-    Page::single(&v).save("scatter.svg").expect("saving svg");
-}
+    // A page with a single view is then saved to an SVG file
+    Page::single(&v).save("scatter.svg").unwrap();
+}