From 643d53dd8701007bf397ae14c280b80d52eb6950 Mon Sep 17 00:00:00 2001
From: STP <adam.a.french@outlook.com>
Date: Fri, 10 Nov 2023 23:33:05 -0500
Subject: [PATCH] Implemented Vec4

---
 src/vec4.rs | 252 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 252 insertions(+)
 create mode 100644 src/vec4.rs

diff --git a/src/vec4.rs b/src/vec4.rs
new file mode 100644
index 0000000..78b3247
--- /dev/null
+++ b/src/vec4.rs
@@ -0,0 +1,252 @@
+use std::fmt;
+use std::ops;
+// Vectors will have 4 components
+// Color: r,b,g,a
+// Vector: x,y,z,0
+// Position: x,y,z,1
+
+pub struct Vec4 {
+    x: [f32; 4],
+}
+
+impl Vec4 {
+    //Initialise a vector with 4 components
+    pub fn new(x: f32, y: f32, z: f32, w: f32) -> Vec4 {
+        Vec4 { x: [x, y, z, w] }
+    }
+    //Create a unit vector
+    pub fn unit() -> Vec4 {
+        Vec4 {
+            x: [1.0, 1.0, 1.0, 1.0],
+        }
+    }
+    //Create a vector will all entries equal to x
+    pub fn with_value(x: f32) -> Vec4 {
+        Vec4 { x: [x, x, x, x] }
+    }
+    //Dot product
+    pub fn dot(&self, other: &Vec4) -> f32 {
+        self.x[0] * other.x[0]
+            + self.x[1] * other.x[1]
+            + self.x[2] * other.x[2]
+            + self.x[3] * other.x[3]
+    }
+    //Normalise the vector
+    pub fn normalise(&mut self) {
+        let magnitude = self.dot(self).sqrt();
+        if magnitude != 0.0 {
+            *self /= magnitude;
+        }
+    }
+}
+// METHODS TO ADD---------------------------
+// + Vec4
+impl ops::Add<Vec4> for Vec4 {
+    type Output = Vec4;
+
+    fn add(self, other: Vec4) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] + other.x[0],
+                self.x[1] + other.x[1],
+                self.x[2] + other.x[2],
+                self.x[3] + other.x[3],
+            ],
+        }
+    }
+}
+// + f32
+impl ops::Add<f32> for Vec4 {
+    type Output = Vec4;
+
+    fn add(self, other: f32) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] + other,
+                self.x[1] + other,
+                self.x[2] + other,
+                self.x[3] + other,
+            ],
+        }
+    }
+}
+// += Vec4
+impl ops::AddAssign<Vec4> for Vec4 {
+    fn add_assign(&mut self, other: Vec4) {
+        self.x[0] += other.x[0];
+        self.x[1] += other.x[1];
+        self.x[2] += other.x[2];
+        self.x[3] += other.x[3];
+    }
+}
+// += f32
+impl ops::AddAssign<f32> for Vec4 {
+    fn add_assign(&mut self, other: f32) {
+        self.x[0] += other;
+        self.x[1] += other;
+        self.x[2] += other;
+        self.x[3] += other;
+    }
+}
+// - Vec4
+impl ops::Sub<Vec4> for Vec4 {
+    type Output = Vec4;
+    fn sub(self, other: Vec4) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] - other.x[0],
+                self.x[1] - other.x[1],
+                self.x[2] - other.x[2],
+                self.x[3] - other.x[3],
+            ],
+        }
+    }
+}
+// - f32
+impl ops::Sub<f32> for Vec4 {
+    type Output = Vec4;
+
+    fn sub(self, other: f32) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] - other,
+                self.x[1] - other,
+                self.x[2] - other,
+                self.x[3] - other,
+            ],
+        }
+    }
+}
+// -= Vec4
+impl ops::SubAssign<Vec4> for Vec4 {
+    fn sub_assign(&mut self, other: Vec4) {
+        self.x[0] -= other.x[0];
+        self.x[1] -= other.x[1];
+        self.x[2] -= other.x[2];
+        self.x[3] -= other.x[3];
+    }
+}
+// -= f32
+impl ops::SubAssign<f32> for Vec4 {
+    fn sub_assign(&mut self, other: f32) {
+        self.x[0] -= other;
+        self.x[1] -= other;
+        self.x[2] -= other;
+        self.x[3] -= other;
+    }
+}
+// * Vec4
+impl ops::Mul<Vec4> for Vec4 {
+    type Output = Vec4;
+    fn mul(self, other: Vec4) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] * other.x[0],
+                self.x[1] * other.x[1],
+                self.x[2] * other.x[2],
+                self.x[3] * other.x[3],
+            ],
+        }
+    }
+}
+// * f32
+impl ops::Mul<f32> for Vec4 {
+    type Output = Vec4;
+
+    fn mul(self, other: f32) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] * other,
+                self.x[1] * other,
+                self.x[2] * other,
+                self.x[3] * other,
+            ],
+        }
+    }
+}
+// *= Vec4
+impl ops::MulAssign<Vec4> for Vec4 {
+    fn mul_assign(&mut self, other: Vec4) {
+        self.x[0] *= other.x[0];
+        self.x[1] *= other.x[1];
+        self.x[2] *= other.x[2];
+        self.x[3] *= other.x[3];
+    }
+}
+// *=
+impl ops::MulAssign<f32> for Vec4 {
+    fn mul_assign(&mut self, other: f32) {
+        self.x[0] *= other;
+        self.x[1] *= other;
+        self.x[2] *= other;
+        self.x[3] *= other;
+    }
+}
+// / Vec4
+impl ops::Div<Vec4> for Vec4 {
+    type Output = Vec4;
+    fn div(self, other: Vec4) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] / other.x[0],
+                self.x[1] / other.x[1],
+                self.x[2] / other.x[2],
+                self.x[3] / other.x[3],
+            ],
+        }
+    }
+}
+// / f32
+impl ops::Div<f32> for Vec4 {
+    type Output = Vec4;
+    fn div(self, other: f32) -> Vec4 {
+        Vec4 {
+            x: [
+                self.x[0] / other,
+                self.x[1] / other,
+                self.x[2] / other,
+                self.x[3] / other,
+            ],
+        }
+    }
+}
+// /= Vec4
+impl ops::DivAssign<Vec4> for Vec4 {
+    fn div_assign(&mut self, other: Vec4) {
+        self.x[0] /= other.x[0];
+        self.x[1] /= other.x[1];
+        self.x[2] /= other.x[2];
+        self.x[3] /= other.x[3];
+    }
+}
+// /=
+impl ops::DivAssign<f32> for Vec4 {
+    fn div_assign(&mut self, other: f32) {
+        if other != 0.0 {
+            self.x[0] /= other;
+            self.x[1] /= other;
+            self.x[2] /= other;
+            self.x[3] /= other;
+        }
+    }
+}
+impl ops::Index<usize> for Vec4 {
+    type Output = f32;
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.x[index]
+    }
+}
+impl ops::IndexMut<usize> for Vec4 {
+    fn index_mut(&mut self, index: usize) -> &mut f32 {
+        &mut self.x[index]
+    }
+}
+impl fmt::Display for Vec4 {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "Vec4({}, {}, {}, {})",
+            self.x[0], self.x[1], self.x[2], self.x[3]
+        )
+    }
+}