public class SimpleRGB
{
	// TO DO: Instant Variables
	private int width;
	private int height;
	private int[] reds;
	private int[] blues;
	private int[] greens;

	public SimpleRGB(int aWidth, int aHeight)
	{
		this.width = aWidth;
		this.height = aHeight;
		reds = new int[width*height];
		blues = new int[width*height];
		greens = new int[width*height];
	}
	
	/**
	 * Gets the width of this image.
	 * @return the width of this image.
	 */
	public int getWidth()
	{
		return this.width;
	}
	
	/**
	 * Gets the height of this image.
	 * @return the height of this image.
	 */
	public int getHeight()
	{
		return this.height;
	}
	
	/**
	 * Sets the red value at coordinate (x,y) to aRed.
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @param aRed the red value (0 - 255)
	 */
	public void setRed(int x, int y, int aRed)
	{
		reds[(y*this.width) + x] = aRed;
	}

	/**
	 * Sets the green value at coordinate (x,y) to aGreen.
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @param aGreen the green value (0 - 255)
	 */
	public void setGreen(int x, int y, int aGreen)
	{
		greens[(y*this.width)+x] = aGreen;
	}

	/**
	 * Sets the blue value at coordinate (x,y) to aBlue.
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @param aBlue the blue value (0 - 255)
	 */
	public void setBlue(int x, int y, int aBlue)
	{
		blues[(y*this.width)+x] = aBlue;
	}
	
	/**
	 * Gets the red value at coordinate (x,y).
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @return the value of red at coordinate (x,y). 
	 */
	public int getRed(int x, int y)
	{
		return reds[(y*this.width) + x];
	}

	/**
	 * Gets the green value at coordinate (x,y).
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @return the value of green at coordinate (x,y). 
	 */
	public int getGreen(int x, int y)
	{
		return greens[(y*this.width)+x];
	}
	
	/**
	 * Gets the blue value at coordinate (x,y).
	 * @param x the x coordinate of this image.
	 * @param y the y coordinate of this image.
	 * @return the value of blue at coordinate (x,y). 
	 */
	public int getBlue(int x, int y)
	{
		return blues[(y*this.width) + x];
	}
	
	/**
	 * Get the NEW image containing only the red color.
	 * The red values of this new image should be exactly
	 * the same as red value of this image. The green and
	 * blue values of this new image should be 0s.
	 * @return the NEW image (SimpleRGB) containing only
	 * the red color of this image.
	 */
	public SimpleRGB getRedImage()
	{
		SimpleRGB output = new SimpleRGB(this.width,this.height);
		for(int i = 0; i < reds.length; i++)
		{
			output.setRed(i%this.width,(i/this.width),reds[i]);
		}
		return output;
	}
	
	/**
	 * Get the NEW image containing only the green color.
	 * The green values of this new image should be exactly
	 * the same as green value of this image. The red and
	 * blue values of this new image should be 0s.
	 * @return the NEW image (SimpleRGB) containing only
	 * the green color of this image.
	 */
	public SimpleRGB getGreenImage()
	{
		SimpleRGB output = new SimpleRGB(this.width,this.height);
		for(int i = 0; i < greens.length; i++)
		{
			output.setGreen(i%this.width,(i/this.width),greens[i]);
		}
		return output;
	}
	
	/**
	 * Get the NEW image containing only the blue color.
	 * The blue values of this new image should be exactly
	 * the same as blue value of this image. The red and
	 * green values of this new image should be 0s.
	 * @return the NEW image (SimpleRGB) containing only
	 * the blue color of this image.
	 */
	public SimpleRGB getBlueImage()
	{
		SimpleRGB output = new SimpleRGB(this.width,this.height);
		for(int i = 0; i < blues.length; i++)
		{
			output.setBlue(i%this.width,(i/this.width),blues[i]);
		}
		return output;
	}
	
	/**
	 * Get the NEW image representing the greyscale of this
	 * image. The grey colors are colors that the red, green
	 * and blue value are exactly the same. To convert an RGB
	 * image into a greyscale image, use the following formula
	 * to calculate the new value.
	 *    (0.21 * red) + (0.72 * green) + (0.07 * blue)
	 * For example, suppose the (R,G,B) value of this image at
	 * coordinate (10,20) are (10,100,200), since
	 *    (0.21 * 10) + (0.72 * 100) + (0.07 * 200) = 88
	 * the (R,G,B) value of the new greyscale image at (10,20)
	 * should be (88,88,88).
	 * @return the NEW image representing the greyscale of this
	 * image.
	 */
	/**
	 *We're not british!
	 *It's grEy in England,
	 *and grAy in America!
	 */
	public SimpleRGB getGreyImage()
	{
		SimpleRGB output = new SimpleRGB(this.width,this.height);
		for(int i = 0; i < reds.length; i++)
		{
			int gray = (int) ((reds[i]*0.21) + (greens[i]*0.72) + (blues[i]*0.07));
			output.setRed(i%this.width,(i/this.width),gray);
			output.setGreen(i%this.width,(i/this.width),gray);
			output.setBlue(i%this.width,(i/this.width),gray);
		}
		return output;
	}
}