From 0c7ef49a3508f1956a26b1b89102cb69bbd6cd15 Mon Sep 17 00:00:00 2001
From: dengqn <434500374@qq.com>
Date: Thu, 31 Jul 2025 18:12:20 +0800
Subject: [PATCH] 3.The vec3 Class

---
 src/image.rs |  24 +++++++++--
 src/main.rs  |  15 ++++++-
 src/vec3.rs  | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+), 5 deletions(-)
 create mode 100644 src/vec3.rs

diff --git a/src/image.rs b/src/image.rs
index 0017c1e..c5a5515 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -1,3 +1,16 @@
+use crate::vec3;
+
+
+pub type Color = vec3::Vec3;
+
+
+impl Color {
+    pub fn to_color(self) -> String {
+        return format!("{} {} {}\n", (self.x * 256.0) as u8, (self.y * 256.0) as u8, (self.z * 256.0) as u8);
+    }
+}
+
+
 /*
 * -------width(i)-------
 * |
@@ -22,12 +35,15 @@ pub fn gen_gradient_ppm_p3(width: i32, height: i32) -> String {
     let mut img_content = format!("P3\n{} {}\n255\n", width, height);
 
     for j in 0..height {
+        println!("scan line {}/{} ", j + 1, height);
         for i in 0..width {
-            let r = 256.0 * (i as f32 / (width-1) as f32);
-            let g = 256.0 * (j as f32 / (height-1) as f32);
-            let b = 256.0 * ((i+j) as f32 / (width + height - 2) as f32);
+            let r = i as f32 / (width-1) as f32;
+            let g = j as f32 / (height-1) as f32;
+            let b = (i+j) as f32 / (width + height - 2) as f32;
+
+            let color = Color::new(r, g, b);
+            img_content.push_str(color.to_color().as_str());
 
-            img_content.push_str(format!("{} {} {}", r as u8, g as u8, b as u8).as_str());
             img_content.push('\n');
         }
     }
diff --git a/src/main.rs b/src/main.rs
index efcc1ad..7f010b4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,23 @@
 use write_file_util::{write_image};
-use image::{gen_gradient_ppm_p3};
+use image::{gen_gradient_ppm_p3, Color};
+use vec3::{Vec3};
 
 mod image;
 mod write_file_util;
+mod vec3;
 
 fn main() {
     let ppm_content = gen_gradient_ppm_p3(400, 225);
+
+    let v1 = Vec3::new(1.0, 1.0, 1.0);
+    let v2 = Vec3::new(1.0, 1.0, 1.0);
+
+    println!("v: {:#} + {:#} => {:#}", v1, v2, v1 + v2);
+    println!("v: {:#} + {:#} => {:#}", v1, v2, v1 - v2);
+    println!("v: {:#} + {:#} => {:#}", v1, v2, v1.dot(v2));
+    println!("v: {:#} + {:#} => {:#}", v1, v2, v1.cross(v2));
+
+    println!("color: {:#}", Color::new(0.3, 0.4, 1.0).to_color());
+
     write_image(ppm_content, "./target/test.ppm".to_string())
 }
diff --git a/src/vec3.rs b/src/vec3.rs
new file mode 100644
index 0000000..3c43797
--- /dev/null
+++ b/src/vec3.rs
@@ -0,0 +1,116 @@
+
+use std::{fmt::Display, ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub, SubAssign}};
+use std::fmt;
+/*
+* [3]
+*/
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Vec3 {
+    pub x: f32,
+    pub y: f32,
+    pub z: f32,
+}
+
+impl Display for Vec3 {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "({}, {}, {})", self.x, self.y, self.z)
+    }
+}
+
+impl Vec3 {
+    pub fn new(x: f32, y: f32, z: f32) -> Self {
+        Vec3 { x, y, z }
+    }
+
+    /// 点积运算
+    pub fn dot(self, other: Vec3) -> f32 {
+        self.x * other.x + self.y * other.y + self.z * other.z
+    }
+
+    /// 叉积运算
+    pub fn cross(self, other: Vec3) -> Vec3 {
+        Vec3 {
+            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,
+        }
+    }
+
+    /// 向量长度
+    fn magnitude(self) -> f32 {
+        (self.x.powi(2) + self.y.powi(2) + self.z.powi(2)).sqrt()
+    }
+}
+
+impl Add for Vec3 {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self {
+        Vec3 { x: self.x + other.x, y: self.y + other.y, z: self.z + other.z }
+    }
+}
+
+// 向量减法: Vec3 - Vec3
+impl Sub for Vec3 {
+    type Output = Self;
+
+    fn sub(self, other: Self) -> Self {
+        Vec3 {
+            x: self.x - other.x,
+            y: self.y - other.y,
+            z: self.z - other.z,
+        }
+    }
+}
+
+// 标量乘法: Vec3 * f32
+impl Mul<f32> for Vec3 {
+    type Output = Self;
+
+    fn mul(self, scalar: f32) -> Self {
+        Vec3 {
+            x: self.x * scalar,
+            y: self.y * scalar,
+            z: self.z * scalar,
+        }
+    }
+}
+
+// 标量乘法: f32 * Vec3 (反向操作)
+impl Mul<Vec3> for f32 {
+    type Output = Vec3;
+
+    fn mul(self, vec: Vec3) -> Vec3 {
+        vec * self
+    }
+}
+
+// 标量除法: Vec3 / f32
+impl Div<f32> for Vec3 {
+    type Output = Self;
+
+    fn div(self, scalar: f32) -> Self {
+        if scalar == 0.0 {
+            panic!("Division by zero");
+        }
+        Vec3 {
+            x: self.x / scalar,
+            y: self.y / scalar,
+            z: self.z / scalar,
+        }
+    }
+}
+
+// 加法赋值: Vec3 += Vec3
+impl AddAssign for Vec3 {
+    fn add_assign(&mut self, other: Self) {
+        *self = *self + other;
+    }
+}
+
+// 标量乘法赋值: Vec3 *= f32
+impl MulAssign<f32> for Vec3 {
+    fn mul_assign(&mut self, scalar: f32) {
+        *self = *self * scalar;
+    }
+}
\ No newline at end of file