moved color consts into color impl

src/color.rs

@@ -15,7 +15,9 @@ impl Color {
         let (r, g, b) = (self.r as u32, self.g as u32, self.b as u32);
         (r << 16) | (g << 8) | b
     }
-}
 
-pub const BLACK: Color = Color { r: 0x00, g: 0x00, b: 0x00 };
-pub const WHITE: Color = Color { r: 0xff, g: 0xff, b: 0xff };
+    /// white color
+    pub const WHITE: Color = Color { r: 0xff, g: 0xff, b: 0xff };
+    /// black color
+    pub const BLACK: Color = Color { r: 0x00, g: 0x00, b: 0x00 };
+}

src/lib.rs

@@ -82,7 +82,7 @@ impl Context {
 
     /// clears the pixel buffer
     pub fn clear(&mut self, color: Option<color::Color>) {
-        let color = color.unwrap_or(color::BLACK);
+        let color = color.unwrap_or(Color::BLACK);
         self.pixel_buffer.as_mut_ref().iter_mut().for_each(|pixel| *pixel = color.as_u32());
     }