Quinn-Curtis Forums

Quinn-Curtis Forums

All Forums

Tools for Java

QCChart2D for Java

TimeCoordinates autoScale problem...

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:

UserName:

Password:

Format Mode:

Format:

Message:

* HTML is OFF
* Forum Code is ON

Smilies

[quote][i]Originally posted by javaman[/i]
[br]Hi,

I'm using a TimeCoordinates attached to a ChartView that seems to be getting stuck when doing an autoScale call.  It'll just sit there for a minute or two (literally) hanging the UI and then it'll come back.  There's no ryhme or reason that I can assertain.  I'd like some advice on things to look for:

I pass in a datasetArray that's initially configured with 10 datasets with a maximum of 300 points of time data points.  I've ensured that the time values were increasing after I discovered that sometimes the data in the datasets would start with inccreasing time and then sometimes jump back in time - causing a loop in the autoScale call that couldn't recover.

I've scrubbed the data till I'm certain that it's always increasing in time - and that the y values are valid double values.

Now, granted there are 10 datasets - that could update at anytime - so I've put a synchronized lock on the TimeCoordinates object to ensure that no two threads are accessing it or the data at the same time.

Nothing works - it still occaisionally hangs.

Oh, I've followed the example from the dynamicCharts - the MixedPlotDynamics code - and found an interesting problem.  In that example, all you do is add the new points to the datasets, and then call repaint on the chartView - but if I do that with mine (without calling autoScale on the TimeCoordinates object) - my graphs disappear and don't come back - I have to autoscale every time my data changes.

So, can you send me some gotcha's or something to help point the way to get rid of this problem?

If you need code, please let me know - thanx.

peace.  JOe...

Thanx - Joe!
[/quote]

Check here to include your profile signature.

T O P I C R E V I E W
javaman	Posted - 28 Jun 2009 : 19:43:12 Hi, I'm using a TimeCoordinates attached to a ChartView that seems to be getting stuck when doing an autoScale call. It'll just sit there for a minute or two (literally) hanging the UI and then it'll come back. There's no ryhme or reason that I can assertain. I'd like some advice on things to look for: I pass in a datasetArray that's initially configured with 10 datasets with a maximum of 300 points of time data points. I've ensured that the time values were increasing after I discovered that sometimes the data in the datasets would start with inccreasing time and then sometimes jump back in time - causing a loop in the autoScale call that couldn't recover. I've scrubbed the data till I'm certain that it's always increasing in time - and that the y values are valid double values. Now, granted there are 10 datasets - that could update at anytime - so I've put a synchronized lock on the TimeCoordinates object to ensure that no two threads are accessing it or the data at the same time. Nothing works - it still occaisionally hangs. Oh, I've followed the example from the dynamicCharts - the MixedPlotDynamics code - and found an interesting problem. In that example, all you do is add the new points to the datasets, and then call repaint on the chartView - but if I do that with mine (without calling autoScale on the TimeCoordinates object) - my graphs disappear and don't come back - I have to autoscale every time my data changes. So, can you send me some gotcha's or something to help point the way to get rid of this problem? If you need code, please let me know - thanx. peace. JOe... Thanx - Joe!
2 L A T E S T R E P L I E S (Newest First)
javaman	Posted - 29 Jun 2009 : 13:30:43 Some excellent ideas - thanx. Unfortunately, I can't just resort the data - it's telemetry based - and it's what's coming off the wire - so I don't know if the backtracking data can be resorted or not. 2) The idea of doing the autoScale dataset by dataset and see where it occurs is good. I'll give that a try - hadn't thought about that. BTW, I do use your method checkValidData() for each and every point in the dataset - none get in that fail that test (or I can merely mark it as false in the setValidData() method... Thanx - I'll keep you posted. Thanx - Joe!
quinncurtis	Posted - 29 Jun 2009 : 09:25:19 Backtracking x time values should not cause the auto-scaling routines to hang like you describe. In any event, you can just call the dataset sortByX(true) method which will make the x-values always increasing. What could cause the problem is invalid time/date values. You should try and isolate the problem, by auto-scaling the datasets one by one, and trying to identify the dataset(s) that cause the problem. If you are still unable to identify why the data won't auto-scale, you should send the bad dataset(s) to us in a text file. The MixedPlotDynamics is not a scrolling time graph with always increasing x-values. The range of x-values never changes, and the x-scale never changes. The y-values are shifted down one array index element with each update, creating the appearance of scrolling data. So it is very different than what you have. I would expect that if you are not constantly re-scaling the x-scale for the new data, the graph would appear to stop updating. You would be better off using the DataloggerView example, which is time based and the x-values always increase. The new x- and y-scale are auto-scaled with each update, and the axis and axis labels autocalc'd for the new ranges. Dataset1.addTimeGroupDataPoints(xvalue,temp); xValues = Dataset1.getTimeXData(); nNumPnts = Dataset1.getNumberDatapoints(); pTransform1.autoScale(Dataset1,ChartConstants.AUTOAXES_NEAR, ChartConstants.AUTOAXES_NEAR); if (fixedStartTimeFlag) pTransform1.setTimeScaleStart(xValues[0]); // peg start of graph at start of data else // Set a 100 point view into data pTransform1.setTimeScaleStart(Dataset1.getTimeXDataValue(Dataset1.getNumberDatapoints()-100)); xAxis1.calcAutoAxis(); yAxis1.calcAutoAxis(); xAxisLab1.calcAutoAxisLabels(); yAxisLab1.calcAutoAxisLabels();

Quinn-Curtis Forums