added canvas sizes

color/src/lib.rs

@@ -18,6 +18,27 @@ impl Color {
             blue,
         }
     }
+
+    pub fn red(&self) -> f32 {
+        self.red
+    }
+
+    pub fn green(&self) -> f32 {
+        self.green
+    }
+
+    pub fn blue(&self) -> f32 {
+        self.blue
+    }
+
+    pub fn ppm_str(&self) -> String {
+        // need to scale 0 - 1 -> 0 - 255
+        let r = (self.red * 255.0) as u8;
+        let g = (self.green * 255.0) as u8;
+        let b = (self.blue * 255.0) as u8;
+
+        format!("{} {} {}", r, g, b)
+    }
 }
 
 impl PartialEq for Color {