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The view, whose header import every other one, so #import < PHGraph/PHGraphView.h > is usually everything you need.

Relevant instance variables are :
NSMutableArray *xAxis;
NSMutableArray *yAxis;
NSMutableArray *graphObjects;
NSPoint currentLocation;
int mouseEventsMode;
IBOutlet id delegate;
BOOL hasBorder;
float leftBorder;
float rightBorder;
float topBorder;
float bottomBorder;

and methods :
-(void)addPHxAxis:(PHxAxis*)axis;
-(void)addPHyAxis:(PHyAxis*)axis;
-(void)addPHGraphObject:(PHGraphObject*)object;
-(void)removePHxAxis:(PHxAxis*)axis;
-(void)removePHyAxis:(PHyAxis*)axis;
-(void)removePHGraphObject:(PHGraphObject*)object;

Direct accessors to the objects arrays :
-(NSMutableArray*)xAxisMutableArray;
-(NSMutableArray*)yAxisMutableArray;
-(NSMutableArray*)graphObjectsMutableArray;
-(void)setXAxisMutableArray:(NSMutableArray*)anArray;
-(void)setYAxisMutableArray:(NSMutableArray*)anArray;
-(void)setGraphObjectsMutableArray:(NSMutableArray*)anArray;


-(void)setMouseEventsMode:(int)mode;
-(void)setDelegate:(id)newDelegate;
-(id)delegate;
-(void)setHasBorder:(BOOL)value;
-(void)setLeftBorder:(float)newLeftBorder rightBorder:(float)newRightBorder
bottomBorder:(float)newBottomBorder topBorder:(float)newTopBorder;

The three following methods are called by the contextual menu :
-(void)copyToPasteboardAsTIFF;
-(void)copyToPasteboardAsPDF;
-(void)copyToPasteboardAsEPS;

The mouseEventsMode is one of PHOnlyDelegate, PHCompositeZoomAndDrag, PHDragAndMove and PHZoomOnSelection (try the provided examples to see how they perform).

The hasBorder boolean allows one to decide if the tickmarks are to be drawn inside the graph or outside it. (In the second case, some space must be reserved for the drawing of the tickmarks and of their values.) By default, there is no border around the graph.

The delegate may implement :

-(void)mouseDownAtPoint:(NSPoint)pos;
-(void)mouseDraggedAtPoint:(NSPoint)pos;
-(void)mouseUpAtPoint:(NSPoint)pos;

getting the position of the event, with 0 to 1 scaling (then can use convertValue from one axis to get the good coordinate of the event.)