/** RGB colors
 * (Note that java.awt.Color is also a predefined Java class)
 * @author: Phil Gage
 */
class Color {

    /** Red, Green, Blue range 0.0 to 1.0 */
    public double r, g, b;

    Color () {}

//    Color () {
//        this.r = 0.5;  // default gray
//        this.g = 0.5;
//        this.b = 0.5;
//    }

    Color (Color c) {
        this.r = c.r;
        this.g = c.g;
        this.b = c.b;
    }

    Color (double r, double g, double b) {
        this.r = r;
        this.g = g;
        this.b = b;
    }

    void set (Color c) {
        this.r = c.r;
        this.g = c.g;
        this.b = c.b;
    }

    void add (Color c) {
        this.r += c.r;
        this.g += c.g;
        this.b += c.b;
    }

    void addScaled (double k, Color c) {
        this.r += k*c.r;
        this.g += k*c.g;
        this.b += k*c.b;
    }

    void multiply (Color c) {
        this.r *= c.r;
        this.g *= c.g;
        this.b *= c.b;
    }

    /** Compare colors */
    public boolean equals (Color c) {
        return this.r == c.r &&
               this.g == c.g &&
               this.b == c.b;
    }

    // Define some common colors
    public static final Color BLACK =   new Color (0.0, 0.0, 0.0);
    public static final Color WHITE =   new Color (1.0, 1.0, 1.0);
    public static final Color GRAY =    new Color (0.5, 0.5, 0.5);
    public static final Color RED =     new Color (1.0, 0.0, 0.0);
    public static final Color GREEN =   new Color (0.0, 1.0, 0.0);
    public static final Color BLUE =    new Color (0.0, 0.0, 1.0);
    public static final Color CYAN =    new Color (0.0, 1.0, 1.0);
    public static final Color MAGENTA = new Color (1.0, 0.0, 1.0);
    public static final Color YELLOW =  new Color (1.0, 1.0, 0.0);
}