Image example to show Ownership

src/main.rs

@@ -1,37 +1,70 @@
-struct Vector3 {
-    x: f32,
-    y: f32,
-    z: f32,
+#[derive(Copy, Clone)]
+struct RGB {
+    red: u8,
+    green: u8,
+    blue: u8,
 }
 
-impl Vector3 {
-    pub fn new(x: f32, y: f32, z: f32) -> Vector3 {
-        Vector3 { x, y, z }
+impl RGB {
+    fn new(red: u8, green: u8, blue: u8) -> RGB {
+        RGB { red, green, blue }
+    }
+
+    fn black() -> RGB {
+        RGB {
+            red: 0,
+            green: 0,
+            blue: 0,
         }
     }
 
-fn print(vec: Vector3) -> Vector3 {
-    println!("Vector3( x = {}, y = {}, z = {})", vec.x, vec.y, vec.z);
-
-    vec
+    fn white() -> RGB {
+        RGB {
+            red: 255,
+            green: 255,
+            blue: 255,
+        }
+    }
 }
 
-impl Drop for Vector3 {
-    fn drop(&mut self) {
-        println!("Vector3 was dropped!");
+struct Image {
+    width: usize,
+    height: usize,
+    data: Vec<RGB>,
+}
+
+impl Image {
+    fn new(width: usize, height: usize, data: Vec<RGB>) -> Image {
+        if width * height != data.len() {
+            panic!("Width and height of image does not match amount of data.");
+        }
+
+        let img = Image {
+            width,
+            height,
+            data,
+        };
+
+        img
+    }
+
+    fn white_image(width: usize, height: usize) -> Image {
+        let mut data = Vec::new();
+
+        for i in 0..width * height {
+            data.push(RGB::white());
+        }
+
+        Image::new(width, height, data)
+    }
+
+    fn get(&self, x: usize, y: usize) -> RGB {
+        self.data[y * self.width + x]
     }
 }
 
 fn main() {
-    let mut vec = Vector3::new(1.0, 0.0, 0.0);
+    let image = Image::white_image(640, 480);
 
-    /*
-        println!("Calling print");
-        let vec2 = print(vec);
-        println!("Calling print returned");
-    */
-
-    let vec2 = vec;
-
-    vec.y = 2.0;
+    let c = image.get(0, 0);
 }