Point whiskers

[ekta1994]

I am drawing a scatter plot and need to show ranges in that. Like left and right range. By range, what I mean is, for the current (x,y) point on the scatter plot, i need to draw whiskers i.e. a line from x-(deltaX) to x. I don't want a simple straight line but somewhat like how minimum and maximum values are shows in Box and whisker plots using whiskers. So, this can be imagines as the box and whisker plot with a point instead of the complete box. Which type of chart will be most suitable for this. I don't want to manually draw the line using draw() or by adding annotations.

[John Matthews]

You might look at MinMaxCategoryRenderer, discussed here and illustrated here.

[ekta1994]

Documentation says "for use with CategoryPlot". I have XY Plot. I cam across XYError renderers for XY plots. But that doesn't seem to be working good.

[John Matthews]

Maybe HighLowRenderer?

[ekta1994]

This renderer needs OHLC dataset in which every OHLC data item needs Date on x axis. I have normal (x,y) points to be plotted and (x-deltaX -> x+deltaX) to be shown via whiskers.
Also, why this renderer is developed specific for date purpose?

[John Matthews]

I don't want to manually draw the line using draw() or by adding annotations.

If no existing render meets your requirements, won't you have to look at those alternatives?

I came across XYError renderers for XY plots. But that doesn't seem to be working good.

On review, XYErrorRenderer looks ideal. What was the problem?

I have normal (x,y) points to be plotted and (x-deltaX -> x+deltaX) to be shown via whiskers.

An XYErrorRenderer expects an IntervalXYDataset. You could store the bounds, x±deltaX, in the values returned by getStartX() and getEndX(), respectively. Which implementation of IntervalXYDataset did you use?

Why this HighLowRenderer is developed specific for date purpose?

In the demo, HighLowRenderer appears among the financial charts, all of which appear to involve functions of time.

[ekta1994]

Yes. I am doing the same for XYErrorRenderer and using XYIntervalSeriesCollection. But the scale on which it plots the point looks very bad. While if I normally plot the points on an XY plot without drawing any error bars, it looks good.

[david.gilbert]

Can you post the two charts side by side and explain what looks bad?

[ekta1994]

XYErrorRenderer worked. Problem was happening because of custom range setting. I wasn't over riding restoreAutoBounds().
But the other issue I am running into is: The dataset for the renderer is of the form (x, xmin, xmax, Y ) for YIntervalSeries. This draws the error bars from xmin-->x-->xmax. In some cases I only need the right bar and in some cases only left. For left bars, what I do is (x,xmin,x,Y) i.e. Put the value of X only in xmax field. This draws the vertical error line for the right bar on the point itself. Similarly for the right error bar, I put x as xmin. Is there, any why I can tell the renderer not to override?

[paradoxoff]

Only by writing a new renderer.
Your workaround (returning different value for x, xmin and xmax) looks om to me.

[prize]

just like tutorial, thx. For me everything is now much much known