[MANDATORY if not using default initialization] sets the minimum and maximum X and Y scales.
[MANDATORY if not using default initialization] sets the minimum and maximum X and Y scales. While a graph's actual X and Y axis lengths are values less than the screen's width and height, the actual values associated with a graph could be anything (e.g. X-axis showing 1998 to 2005 and Y axis showing 5000 to 10000). The scale values specify these values - and must be determined before setting the values.The Max scale values for each axis MUST be greater >= the highest numerical value in any data point of the graph for that axis.
The Min scale values for each axis MUST be <= the lowest numerical value in any data point of the graph for that axis.