question: @ Override public boolean contains ( Point2D . Double p ) { Rectangle2D . Double r = ( Rectangle2D . Double ) rectangle . clone ( ) ; if ( get ( IS_QUADRATIC ) ) { double side = Math . max ( r . width , r . height ) ; r . x -= ( side - r . width ) / 2 ; r . y -= ( side - r . height ) / 2 ; r . width = r . height = side ; } double grow = AttributeKeys . getPerpendicularFillGrowth ( this ) ; if ( grow != 0d ) { double w = r . width / 2d ; double h = r . height / 2d ; double lineLength = Math . sqrt ( w * w + h * h ) ; double scale = grow / lineLength ; double yb = scale * w ; double xa = scale * h ; double growx , growy ; growx = ( ( yb * yb ) / xa + xa ) ; growy = ( ( xa * xa ) / yb + yb ) ; Geom . grow ( r , growx , growy ) ; } Path2D . Double diamond = new Path2D . Double ( ) ; diamond . moveTo ( ( r . x + r . width / 2 ) , r . y ) ; diamond . lineTo ( ( r . x + r . width ) , ( r . y + r . height / 2 ) ) ; diamond . lineTo ( ( r . x + r . width / 2 ) , ( r . y + r . height ) ) ; diamond . lineTo ( r . x , ( r . y + r . height / 2 ) ) ; diamond . closePath ( ) ; return diamond . contains ( p ) ; }
target:  Checks if a Point2D.Double is inside the figure.