From 5f3d80185139a2b744f4f9bfb420c91baf56b186 Mon Sep 17 00:00:00 2001
From: genius <pelekhay@gmail.com>
Date: Sun, 31 May 2020 11:32:58 +0200
Subject: [PATCH 1/3] Fix pistons scaling of circles

---
 src/drawing/backend_impl/piston.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/drawing/backend_impl/piston.rs b/src/drawing/backend_impl/piston.rs
index 4a579056..80e59cd6 100644
--- a/src/drawing/backend_impl/piston.rs
+++ b/src/drawing/backend_impl/piston.rs
@@ -150,7 +150,11 @@ impl<'a, 'b> DrawingBackend for PistonBackend<'a, 'b> {
         style: &S,
         fill: bool,
     ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
-        let rect = circle(center.0 as f64, center.1 as f64, radius as f64);
+        let rect = circle(
+            center.0 as f64 * self.scale,
+            center.1 as f64 * self.scale,
+            radius as f64 * self.scale,
+        );
         if fill {
             ellipse(
                 make_piston_rgba(&style.as_color()),

From 5244a9fdfe0e47b608dc25f5c7a18e3ba9149384 Mon Sep 17 00:00:00 2001
From: genius <pelekhay@gmail.com>
Date: Tue, 2 Jun 2020 10:37:43 +0200
Subject: [PATCH 2/3] refactored call to piston_window::circle into make_circle
 and added unit-test for it

---
 src/drawing/backend_impl/piston.rs | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/drawing/backend_impl/piston.rs b/src/drawing/backend_impl/piston.rs
index 80e59cd6..02605fcb 100644
--- a/src/drawing/backend_impl/piston.rs
+++ b/src/drawing/backend_impl/piston.rs
@@ -34,6 +34,14 @@ fn make_point_pair(a: BackendCoord, b: BackendCoord, scale: f64) -> [f64; 4] {
     ]
 }
 
+fn make_circle(center: BackendCoord, radius: u32, scale: f64) -> [f64; 4] {
+    circle(
+        center.0 as f64 * scale,
+        center.1 as f64 * scale,
+        radius as f64 * scale,
+    )
+}
+
 impl<'a, 'b> PistonBackend<'a, 'b> {
     pub fn new(size: (u32, u32), scale: f64, context: Context, graphics: &'b mut G2d<'a>) -> Self {
         Self {
@@ -150,11 +158,7 @@ impl<'a, 'b> DrawingBackend for PistonBackend<'a, 'b> {
         style: &S,
         fill: bool,
     ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
-        let rect = circle(
-            center.0 as f64 * self.scale,
-            center.1 as f64 * self.scale,
-            radius as f64 * self.scale,
-        );
+        let rect = make_circle(center, radius, self.scale);
         if fill {
             ellipse(
                 make_piston_rgba(&style.as_color()),
@@ -208,3 +212,13 @@ pub fn draw_piston_window<F: FnOnce(PistonBackend) -> Result<(), Box<dyn std::er
     }
     None
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    #[test]
+    fn test_make_circle() {
+        assert_eq!(make_circle((1, 1), 0, 1.0), [1.0, 1.0, 0.0, 0.0]);
+        assert_eq!(make_circle((1, 2), 3, 4.0), [-8.0, -4.0, 24.0, 24.0]);
+    }
+}

From 67311269030844eb7d3ef015867e55ec93cb0a6a Mon Sep 17 00:00:00 2001
From: Evan Richter <evanjrichter@gmail.com>
Date: Sat, 15 Aug 2020 11:47:06 -0400
Subject: [PATCH 3/3] Feature: new `Quartiles` from precalculated values

---
 src/data/quartiles.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/data/quartiles.rs b/src/data/quartiles.rs
index 054f51d1..c3d09b7b 100644
--- a/src/data/quartiles.rs
+++ b/src/data/quartiles.rs
@@ -62,6 +62,33 @@ impl Quartiles {
         }
     }
 
+    /// Create a new quartiles struct with pre-calculated values.
+    ///
+    /// - `s`: The array of the original values
+    /// - **returns** The newly created quartiles
+    ///
+    /// ```rust
+    /// use plotters::prelude::*;
+    ///
+    /// let quartiles = Quartiles::new_from_values(&[2, 24, 31, 39, 45]);
+    /// assert_eq!(quartiles.values(), [2.0, 24.0, 31.0, 39.0, 45.0]);
+    /// ```
+    pub fn new_from_values<T: Into<f64> + Copy + PartialOrd>(s: &[T; 5]) -> Self {
+        let s = s.to_owned();
+        assert!(s[0] <= s[1]);
+        assert!(s[1] <= s[2]);
+        assert!(s[2] <= s[3]);
+        assert!(s[3] <= s[4]);
+
+        Self {
+            lower_fence: s[0].into(),
+            lower: s[1].into(),
+            median: s[2].into(),
+            upper: s[3].into(),
+            upper_fence: s[4].into(),
+        }
+    }
+
     /// Get the quartiles values.
     ///
     /// - **returns** The array [lower fence, lower quartile, median, upper quartile, upper fence]