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An abstract class, from which every object that needs to be drawn on the view inherits from. To be able to draw itself, it needs to know about its axis, so it has to keep references to them.

Methods :
-(void)drawWithContext:(CGContextRef)context andRect:(NSRect)rect;
does nothing with this abstract class, but has to be implemented in every child

-(id)initWithXAxis:(PHxAxis *)aPHxAxis yAxis:(PHyAxis *)aPHyAxis;
-(void)setXAxis:(PHxAxis *)aPHxAxis;
-(void)setYAxis:(PHyAxis *)aPHyAxis;


-(BOOL)isLongToDraw;
answers NO in this class, but can be implemented in a child, so that the drawing of a huge object (in the millions of points range then) do not draw itself when dragging the view and changing axis many times...

To toggle the displaying of one object :
-(BOOL)shouldDraw;
-(void)setShouldDraw:(BOOL)flag;