Implement Color constructors taking integer arguments (fixes #123)

src/graphics/color.rs

@@ -26,6 +26,25 @@ impl Color {
     pub fn rgba(r: f32, g: f32, b: f32, a: f32) -> Color {
         Color { r, g, b, a }
     }
+
+    /// Creates a new `Color`, with the specified RGB integer values and the alpha set to 1.0.
+    pub fn rgb8(r: u8, g: u8, b: u8) -> Color {
+        let r = f32::from(r) / 255.0;
+        let g = f32::from(g) / 255.0;
+        let b = f32::from(b) / 255.0;
+
+        Color { r, g, b, a: 1.0 }
+    }
+
+    /// Creates a new `Color`, with the specified RGBA integer values.
+    pub fn rgba8(r: u8, g: u8, b: u8, a: u8) -> Color {
+        let r = f32::from(r) / 255.0;
+        let g = f32::from(g) / 255.0;
+        let b = f32::from(b) / 255.0;
+        let a = f32::from(a) / 255.0;
+
+        Color { r, g, b, a }
+    }
 }
 
 /// Shortcut for Color::rgb(0.0, 0.0, 0.0).
@@ -43,3 +62,18 @@ pub const WHITE: Color = Color {
     b: 1.0,
     a: 1.0,
 };
+
+#[cfg(test)]
+mod tests {
+    use super::Color;
+
+    #[test]
+    fn rgb8_creation() {
+        let c1 = Color::rgb8(100, 149, 236);
+        let c2 = Color::rgb(0.39, 0.58, 0.92);
+
+        assert!((c1.r - c2.r).abs() < 0.01);
+        assert!((c1.g - c2.g).abs() < 0.01);
+        assert!((c1.b - c2.b).abs() < 0.01);
+    }
+}