JFreeChart + Scrollbar

[AdamM]

Hi,

I am trying to add a Horizontal Scroll Bar to my Line, High/Low, Candelstick Finencial diagrams. I would like to sroll just the Graphs, the Vertical axis should remain visible on the side(s).

Could someone help me, how to solve this problem with the JFreeChart?

Thanx,

Adam

[Matthias]

One proposal for a temporary solution until 1.0.0 is released is here:
http://www.jfree.org/phpBB2/viewtopic.php?t=644

[kingguppy]

And another:
http://www.jfree.org/phpBB2/viewtopic.php?t=6342

[Matthias; kingguppy]

Hi,

Thanx, I could solve the problem (using your ideas)

So Thanx again,

Adam

[weckenmc]

I am working with JChart v.0.9.18, using the PanScrollZoomDemo features for permitting a chart to be scrollable. However, I am having trouble with the feature.

The chart displays correctly, at first, inside of the PanScrollZoom panel with three series of data graphed. However, once I depress the "plus sign (+)" button for the "zoom in" feature to enable the panning, the data series are no longer displayed, but the scrollbar is enabled.
Next, I use the scrollbar to pan right, and a graph with the series 1 and 2 data displays without series 3 data.
Next, I use the scrollbar to pan left, and the display returns to the no data and no graph.
Lastly, I use the scrollbar to pan left once more, and a graph with the series 3 data displays without series 1 and 2.
This is repeatable as I scroll/pan left or right.

I think the problem is that I am using a LineChart with a CategoryAxis (and a ValueAxis), whereas the feature seems to be using a LineXYChart with two Number Axes. The code checks for a XYPlot, but I am using the CategoryPlot. Therefore, I have added code to test for and handle the CategoryPlot instance at each place that tests for a plot that is an instance of the XYPlot. However, I still can not get the feature to scroll correctly.
I need to work this out for both Line and Bar charts.

I have some MS Word docs of images of this situation, but am unaware of how to attach the doc?

Any suggestions on making this work correctly?

-cgw

[Matthias]

I wonder how you have realized a scrollable CategoryAxis. In the last months I didn't work with JFreeChart; maybe there are new features meanwhile. In the past, because of this scrolling problem, I only used XYPlot, even for bar charts and such. For these then I used SymbolicAxis which is derived from ValueAxis (and not CategoryAxis). Sorry, that I can't say more.

[weckenmc]

Yes, I had added code to the PanScrollZoomDemo Class to handle CategoryAxis. However, the scrollbar feature did not work completely in that only some or none of the data would display when I used the scrollbar to pan left or right.

Since the last posting, I decided to convert my code to using the XYAxis instead. However, I get the same results.

-cgw

[weckemc]

Okay, I was able to get the scrollbar working.
I had been using my own createChart() method and needed two statements from the original PanScrollZoomDemo class that saves the original fit y-axis positions:

ValueAxis axis = xyPlot.getRangeAxis();
this.primYMinMax[0]=-5;
this.primYMinMax[1]=15;

Now that I have added them to my code, with the appropriate values for my charts, the scrolling is working using XYAxis for both the line and bar charts.

BTW: I did not go back and try to get CategoryAxis to work, because it was unclear to me how to get the max range on the x-axis, since the values are categories instead of numbers.

cgw(weckenmc)