use color::Color;

struct Canvas {
    width: usize,
    height: usize,
    pixels: Vec<Vec<Color>>,
}

impl Canvas {
    fn new(width: usize, height: usize) -> Canvas {
        Canvas {
            width,
            height,
            pixels : vec![vec![Color::new(0.0, 0.0, 0.0); width]; height],
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn create_canvas() {
        let c = Canvas::new(10, 20);
        assert_eq!(10, c.width);
        assert_eq!(20, c.height);

        let black = Color::new(0.0, 0.0, 0.0);
        for row in c.pixels {
            for pixel in row {
                assert_eq!(black, pixel);
            }
        }
    }
}