void getPixelValueRange (double& pvmin, double& pvmax) const;
void setAxisExtent (double minX, double maxX, double minY, double maxY);
bool getAxisExtent (double& minX, double& maxX, double& minY, double& maxY) const
void getPixelValueRange (double& pvmin, double& pvmax) const;
void setAxisExtent (double minX, double maxX, double minY, double maxY);
bool getAxisExtent (double& minX, double& maxX, double& minY, double& maxY) const