Add stub for scatter plotting

Author: milliams

src/lib.rs

@@ -5,5 +5,6 @@ Data structures and helpers for managing plotting data
 */
 
 pub mod histogram;
+pub mod scatter;
 pub mod axis;
 pub mod utils;

src/scatter.rs

@@ -0,0 +1,38 @@
+use std::f64;
+
+use axis;
+
+#[derive(Debug)]
+pub struct Scatter {
+    pub data: Vec<(f64, f64)>,
+    pub x_axis: axis::Axis,
+    pub y_axis: axis::Axis,
+}
+
+impl Scatter {
+    pub fn from_vec(v: &[(f64, f64)]) -> Scatter {
+
+        let mut x_min = f64::INFINITY;
+        let mut x_max = f64::NEG_INFINITY;
+        let mut y_min = f64::INFINITY;
+        let mut y_max = f64::NEG_INFINITY;
+        let mut data:  Vec<(f64, f64)> = vec![];
+        for &(x, y) in v {
+            x_min = x_min.min(x);
+            x_max = x_max.max(x);
+            y_min = y_min.min(y);
+            y_max = y_max.max(y);
+            data.push((x, y));
+        }
+
+        let x_axis = axis::Axis::new(x_min, x_max);
+        let y_axis = axis::Axis::new(y_min, y_max);
+
+        Scatter {
+            data: data,
+            x_axis: x_axis,
+            y_axis: y_axis,
+        }
+    }
+}
+