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two tone aspect
this if else block controls the color of the pen depending on where the mose is on the stage. if it is above a certain point the mouse will draw in blue and if it is below a certain point it will draw in greenmouse down aspect
this if else block controls if the mouse draws or not. if the mouse is down the pen will also go down so it can draw. if else the pen will stay up until the user puts the mouse down again.