The 'Purple Rain' is based on Prince's real - life experiences in Minneapolis. It's a semi - autobiographical story that delves into his life as a musician, his relationship with his family, and his struggle for stardom. The movie showcases his unique musical talent and the purple - themed aesthetic that was associated with him. The music in 'Purple Rain' was a huge part of the story, with Prince's original songs like 'Purple Rain' itself becoming iconic. It was a way for him to tell his own story through the medium of film and music.