Work in progress--not yet supported.
Adds a line to the graph with the color lineColor. This method returns an integer corresponding to the new line. You will need to use this number to add values to the line later on using add-point.
Adds a point on the line lineNumber, with the Y-value yValue.
Sets the title of the graph to title.
Sets the X-axis label to xName.
Sets the Y-axis label to yName.