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use std::convert::From;
use std::ops::Mul;

use graphics::math::{ Scalar, Vec2d };

/// The size of a shape.
#[derive(Clone, Copy, Debug)]
pub struct Size {
    /// The horizontal length of the shape (width).
    pub w: Scalar,
    /// The vertical length of the shape (height).
    pub h: Scalar,
}

impl From<Size> for Vec2d {
    fn from(size: Size) -> Vec2d {
        [size.w, size.h]
    }
}

impl From<Vec2d> for Size {
    fn from(v: Vec2d) -> Size {
        Size { w: v[0], h: v[1] }
    }
}

impl From<(Scalar, Scalar)> for Size {
    fn from((w, h): (Scalar, Scalar)) -> Size {
        Size { w: w, h: h }
    }
}

impl<T: Into<Size>> Mul<T> for Size {
    type Output = Size;

    fn mul(self, v: T) -> Size {
        let v: Size = v.into();
        Size { w: self.w * v.w, h: self.h * v.h }
    }
}

impl Mul<Scalar> for Size {
    type Output = Size;

    fn mul(self, s: Scalar) -> Size {
        Size { w: self.w * s, h: self.h * s }
    }
}