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An object drawing a vector field. For the moment, only one type of arrow is implemented, but this could change in the future. The coloring of the arrows can be adjusted with a function returning red, green, blue and alpha values (floats) knowing x and y values. See example 6 for an example of code.

Relevant part of the header :

-(id)initWithXAxis:(PHxAxis*)xaxis yAxis:(PHyAxis*)yaxis
function:(int (*)(double,double,double*,double*))aFunction;

-(void)setFunction:(int (*)(double,double,double*,double*))newFunction;
-(void)setColorFunction:(void (*)(double,double,float*,float*,float*,float*))newFunction;
-(void)setColor:(NSColor *)newColor;
-(void)setXGrid:(int)newXgrid yGrid:(int)newYgrid;
-(void)setWidth:(float)newWidth;

Examples of functions for defining vector field and coloring scheme is given in example 6. The xGrid and yGrid values define the grid subdivisions and the number of calculated and drawn arrows.