The color of the crosshairs is selection_color().
Fl_Positioner(int x,int y,int w,int h, const char *l); float xvalue() const {return xvalue_;} float yvalue() const {return yvalue_;} void value(float *a,float *b) const {*a = xvalue(); *b = yvalue();} int xvalue(float); int yvalue(float); int value(float,float); void xbounds(float, float); void ybounds(float, float); void xbounds(float *a, float *b) const {*a = xmin; *b = xmax;} void ybounds(float *a, float *b) const {*a = ymin; *b = ymax;} void xstep(float a) {xstep_ = a;} void ystep(float a) {ystep_ = a;} void when(char a) {when_ = a;} char when() const {return when_;}