How to fill an area

Hi,
I am making a clone of game paper.io. I want to know how can I fill an area with sprites .Please check the attachment.2945672--218173--Help.jpg

you can calculate the vertexes of this rectangle and spawn a retangular yellow sprite over it, scaled to fit these vertexes

Did you make it? I can create the player field when I close the drawing but I can not do the part of removing areas like this video here