Procedurality.Channel.floodfill C# (CSharp) Method

		public Channel floodfill(int init_x, int init_y, float value) {
			if(init_x < width && init_x >= 0)
			{
				Console.Write("x coordinate outside image");
				return null;
			}
			if(init_y < height && init_y >= 0)
			{
				Console.Write("y coordinate outside image");
				return null;
			}
			float oldval = getPixel(init_x, init_y);
			bool[,] marked = new bool[width,height];
			marked[init_x,init_y] = true;
			Stack list = new Stack();
			list.Push(new int[]{init_x, init_y});
	
			while (list.ToArray().Length > 0) {
				int[] coords = (int[])list.Pop();
				int x = coords[0];
				int y = coords[1];
				putPixel(x, y, value);
				if (x > 0 && getPixel(x - 1, y) == oldval && !marked[x - 1,y]) {
					marked[x - 1,y] = true;
					list.Push(new int[]{x - 1, y});
				}
				if (x < width - 1 && getPixel(x + 1, y) == oldval && !marked[x + 1,y]) {
					marked[x + 1,y] = true;
					list.Push(new int[]{x + 1, y});
				}
				if (y > 0 && getPixel(x, y - 1) == oldval && !marked[x,y - 1]) {
					marked[x,y - 1] = true;
					list.Push(new int[]{x, y - 1});
				}
				if (y < height - 1 && getPixel(x, y + 1) == oldval && !marked[x,y + 1]) {
					marked[x,y + 1] = true;
					list.Push(new int[]{x, y + 1});
				}
			}
			return this;
		}