What kind of data do you want to display ?
LINE chart shows lines. The X axis ticks are strings.
H_LINE charts are the same as LINE charts but the X axis is vertical and the Y axis is horizontal.
The X axis can be on the top or on the bottom of the chart.
The X scale can be bottom / top or top / bottom.
YX_CHART shows lines composed of points with numeric coordinates.
A line can be a single point or have numerous points with the same color. The points can be linked by a line or not.
The points can have different shapes or none.
If you run the demo program i hope that you will see the difference.