From 872529bc9a13b1923047a7f9308abaa40eb63d3c Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin.worthe@gmail.com>
Date: Sat, 13 May 2017 21:01:14 +0200
Subject: Random placement

---
 src/math.rs | 58 +++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 45 insertions(+), 13 deletions(-)

(limited to 'src/math.rs')

diff --git a/src/math.rs b/src/math.rs
index 665d4d0..8e81348 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -2,18 +2,18 @@ use std::fmt;
 use rand;
 use rand::distributions::{IndependentSample, Range};
     
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
-pub enum Orientation {
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum Direction {
     North,
     East,
     South,
     West,
 }
 
-impl fmt::Display for Orientation {
+use Direction::*;
+
+impl fmt::Display for Direction {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use Orientation::*;
-        
         f.write_str(
             match self {
                 &North => "North",
@@ -25,7 +25,22 @@ impl fmt::Display for Orientation {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+impl Direction {
+    pub fn random() -> Direction {
+        let mut rng = rand::thread_rng();
+        let between = Range::new(0, 4);
+        let dir = between.ind_sample(&mut rng);
+        match dir {
+            0 => North,
+            1 => East,
+            2 => South,
+            3 => West,
+            _ => panic!("Invalid number generated by random number generator")
+        }
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub struct Point {
     pub x: u16,
     pub y: u16
@@ -38,12 +53,29 @@ impl Point {
             y: y
         }
     }
-}
 
-pub fn random_point(map_dimension: u16) -> Point {
-    let mut rng = rand::thread_rng();
-    let between = Range::new(0, map_dimension);
-    let x = between.ind_sample(&mut rng);
-    let y = between.ind_sample(&mut rng);
-    Point::new(x, y)
+    pub fn random(map_size: u16) -> Point {
+        let mut rng = rand::thread_rng();
+        let between = Range::new(0, map_size);
+        let x = between.ind_sample(&mut rng);
+        let y = between.ind_sample(&mut rng);
+        Point::new(x, y)
+    }
+
+
+    pub fn move_point(&self, direction: Direction, distance: u16, map_size: u16) -> Option<Point> {
+        let x = self.x;
+        let y = self.y;
+        
+        match direction {
+            South if y < distance => None,
+            West if x < distance => None,
+            North if y + distance >= map_size => None,
+            East if x + distance >= map_size => None,
+            South => Some(Point::new(x, y-distance)),
+            West => Some(Point::new(x-distance, y)),
+            North => Some(Point::new(x, y+distance)),
+            East => Some(Point::new(x+distance, y))
+        }
+    }
 }
-- 
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