1 files changed, 71 insertions, 0 deletions
diff --git a/src/calculus.rs b/src/calculus.rs
new file mode 100644
index 0000000..677230e
--- /dev/null
+++ b/src/calculus.rs
@@ -0,0 +1,71 @@
+pub mod calculus {
+    // struct Vec3Cache {
+    //     mag: Option<f64>,
+    //     mag_sql: Option<f64>,
+    //     unit: Option<Vec3>,
+    // }
+
+    pub struct Vec3 {
+        pub x: f64,
+        pub y: f64,
+        pub z: f64,
+        // cached: Vec3Cache,
+    }
+
+    impl Vec3 {
+        pub fn new(x: f64, y: f64, z: f64) -> Self {
+            Self { x, y, z }
+        }
+
+        pub fn add(&self, other: &Self) -> Self {
+            Self {
+                x: self.x + other.x,
+                y: self.y + other.y,
+                z: self.z + other.z
+            }
+        }
+
+        pub fn sub(&self, other: &Self) -> Self {
+            Self {
+                x: self.x - other.x,
+                y: self.y - other.y,
+                z: self.z - other.z
+            }
+        }
+
+        pub fn scalar_mul(&mut self, multiplier: f64) {
+            self.x *= multiplier;
+            self.y *= multiplier;
+            self.z *= multiplier;
+        }
+
+        pub fn mag_sqr(&self) -> f64 {
+            self.x * self.x + self.y * self.y + self.z * self.z
+        }
+
+        pub fn mag(&self) -> f64 {
+            self.mag_sqr().sqrt()
+        }
+
+        pub fn dot_prod(&self, other: &Self) -> f64 {
+            self.x * other.x + self.y * other.y + self.z * other.z
+        }
+
+        pub fn cross_prod(&self, other: &Self) -> Self {
+            Self {
+                x: self.y * other.z - self.z - other.y,
+                y: self.z * other.x - self.x * other.z,
+                z: self.x * other.y - self.y * other.x,
+            }
+        }
+
+        pub fn unit(&self) -> Self {
+            let mag = self.mag();
+            Self {
+                x: self.x / mag,
+                y: self.y / mag,
+                z: self.z / mag,
+            }
+        }
+    }
+}
+\ No newline at end of file