pic.rb

    # This is a short cut method to set the start anchor position
    # If you need finer granularity in positioning use
    # graphic_frame.anchor.from.colOff / rowOff
    # @param [Integer] x The column
    # @param [Integer] y The row
    # @return [Marker]
    def start_at(x, y=0)
      x, y = *parse_coord_args(x, y)
      @graphic_frame.anchor.from.col = x
      @graphic_frame.anchor.from.row = y
    end

    # This is a short cut method to set the end anchor position
    # If you need finer granularity in positioning use
    # graphic_frame.anchor.to.colOff / rowOff
    # @param [Integer] x The column
    # @param [Integer] y The row
    # @return [Marker]
    def end_at(x, y=0)
      x, y = *parse_coord_args(x, y)
      @graphic_frame.anchor.to.col = x
      @graphic_frame.anchor.to.row = y
    end

# If you want to put the image more accurately, use 
# colOff = column Offset
# rowOff = row Offset
# x1,x2 = integer (EMU unit) (https://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/)
# y1,y2, same x1,x2

# Start point
graphic_frame.anchor.from.colOff = x1
graphic_frame.anchor.from.rowOff = y1

# End point
graphic_frame.anchor.to.colOff = x2
graphic_frame.anchor.to.rowOff = y2