I am looking for the other kind of stacked bar.
The current stacked bar is one above the other, I am looking for the one behind the other, so I can see the difference.
That's not a stacked bar then. I don't know what you would call it and I'm not sure what use it would be if it looks like a stack and when the front bar obscures the rear bar. Where have you seen these used?
If you introduce a third, empty series or series of zero values you should be able to introduce a gap between each pair of side by side values. That should make it clearer for value comparison.
That is called a Layered Column Chart in Amcharts.
You can acheive that by adding the clustered key and setting it to false on both series - series[0].clustered
You can also set series[1].column.appearance.width and series[1].zIndex to 1 to bring it to the front
one more question:
you can see from the above picture that the x axis lists even number only.
What's the setting that can allows me to specify the x axis marker? I want to display all numbers (from 0 to 45).
BTW, where can I find these kind of information?
Is there any user manual listing the details of all of the properties?
So far I am just wild guessing and trying every setting to see how it works.