From 864ad4d40bc91cb855fc24ce82cba931c7ca412c Mon Sep 17 00:00:00 2001
From: Jon Janzen <jonjanzen@me.com>
Date: Sat, 23 Jan 2021 17:59:10 -0700
Subject: [PATCH] first tuple test

---
 .gitignore        |  2 +-
 tuples/Cargo.lock |  5 +++++
 tuples/Cargo.toml |  9 +++++++++
 tuples/src/lib.rs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 62 insertions(+), 1 deletion(-)
 create mode 100644 tuples/Cargo.lock
 create mode 100644 tuples/Cargo.toml
 create mode 100644 tuples/src/lib.rs

diff --git a/.gitignore b/.gitignore
index ea8c4bf..eb5a316 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-/target
+target
diff --git a/tuples/Cargo.lock b/tuples/Cargo.lock
new file mode 100644
index 0000000..8ba689a
--- /dev/null
+++ b/tuples/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "tuples"
+version = "0.1.0"
diff --git a/tuples/Cargo.toml b/tuples/Cargo.toml
new file mode 100644
index 0000000..016dc20
--- /dev/null
+++ b/tuples/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "tuples"
+version = "0.1.0"
+authors = ["Jon Janzen <jonjanzen@me.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/tuples/src/lib.rs b/tuples/src/lib.rs
new file mode 100644
index 0000000..d464b4d
--- /dev/null
+++ b/tuples/src/lib.rs
@@ -0,0 +1,47 @@
+type PointVector = (f32, f32, f32, f32);
+
+fn tuple_x(tuple: PointVector) -> f32 {
+    tuple.0
+}
+
+fn tuple_y(tuple: PointVector) -> f32 {
+    tuple.1
+}
+
+fn tuple_z(tuple: PointVector) -> f32 {
+    tuple.2
+}
+
+fn tuple_is_point(tuple: PointVector) -> bool {
+    tuple.3 == 1.0
+}
+fn tuple_is_vector(tuple: PointVector) -> bool {
+    tuple.3 == 0.0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn get_point() {
+        let tuple = (4.3, -4.2, 3.1, 1.0);
+
+        assert_eq!( 4.3,  tuple_x(tuple));
+        assert_eq!(-4.2,  tuple_y(tuple));
+        assert_eq!( 3.1,  tuple_z(tuple));
+        assert_eq!(true,  tuple_is_point(tuple));
+        assert_eq!(false, tuple_is_vector(tuple));
+    }
+
+    #[test]
+    fn get_vector() {
+        let tuple = (4.3, -4.2, 3.1, 0.0);
+
+        assert_eq!( 4.3,  tuple_x(tuple));
+        assert_eq!(-4.2,  tuple_y(tuple));
+        assert_eq!( 3.1,  tuple_z(tuple));
+        assert_eq!(false, tuple_is_point(tuple));
+        assert_eq!(true,  tuple_is_vector(tuple));
+    }
+}