changed point/vector to not take tuples in

tuples/src/lib.rs

@@ -4,14 +4,14 @@ extern crate approx;
 use std::f32;
 
 type PointVector = (f32, f32, f32, f32);
-type Dimensions = (f32, f32, f32);
 
-fn point(dims: Dimensions) -> PointVector {
-    (dims.0, dims.1, dims.2, 1.0)
+fn point(x: f32, y: f32, z: f32) -> PointVector {
+    (x, y, z, 1.0)
 }
 
-fn vector(dims: Dimensions) -> PointVector {
-    (dims.0, dims.1, dims.2, 0.0)
+
+fn vector(x: f32, y: f32, z: f32) -> PointVector {
+    (x, y, z, 0.0)
 }
 
 fn tuple_x(tuple: PointVector) -> f32 {
@@ -29,10 +29,18 @@ fn tuple_z(tuple: PointVector) -> f32 {
 fn tuple_is_point(tuple: PointVector) -> bool {
     relative_eq!(1.0, tuple.3)
 }
+
 fn tuple_is_vector(tuple: PointVector) -> bool {
     relative_eq!(0.0, tuple.3)
 }
 
+fn tuple_equals(lhs: PointVector, rhs: PointVector) -> bool {
+    relative_eq!(lhs.0, rhs.0)
+        && relative_eq!(lhs.1, rhs.1)
+        && relative_eq!(lhs.2, rhs.2)
+        && relative_eq!(lhs.3, rhs.3)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -50,7 +58,7 @@ mod tests {
 
     #[test]
     fn create_point() {
-        let point = point((4.0, -4.0, 3.0));
+        let point = point(4.0, -4.0, 3.0);
         assert_eq!(true, tuple_is_point(point));
     }
 
@@ -67,7 +75,28 @@ mod tests {
 
     #[test]
     fn create_vector() {
-        let vector = vector((4.0, -4.0, 3.0));
+        let vector = vector(4.0, -4.0, 3.0);
         assert_eq!(true, tuple_is_vector(vector));
     }
+
+    #[test]
+    fn tuples_equal() {
+        let lhs = point(1.0, 2.0, 3.0);
+        let rhs = point(1.0, 2.0, 3.0);
+        assert_eq!(true, tuple_equals(lhs, rhs));
+    }
+
+    #[test]
+    fn tuples_relative_equal() {
+        let lhs = point(1.0000001, 2.0, 3.0);
+        let rhs = point(1.0, 2.0, 3.0);
+        assert_eq!(true, tuple_equals(lhs, rhs));
+    }
+
+    #[test]
+    fn tuples_not_equal() {
+        let lhs = point(1.0, 2.0, 3.0);
+        let rhs = vector(1.0, 2.0, 3.0);
+        assert_eq!(false, tuple_equals(lhs, rhs));
+    }
 }