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jiangshachina wrote:[1]Can I set the central value of Price axis? (Black rectangle indicates)
I know just get central value from Range, but set.
If I wish a specific value must be shown as a tick, e.g. the middle position in Number Axis, howto?
On financial charts, that's a common requirement.
For instance, the time series chart must show last day's close price, or today's open price in the middle.

jiangshachina wrote:[2]How to set the first tick and the last one? (Red rectangle indicates)
In my series, the time is from 09:30(including) to 15:00(including),
then I want the first date tick should be 09:30, and the last is 15:00, howto?
If I set a bit of LowerMargin and UpperMargin, that would be OK.
But if I set both of margins to 0.0D, then the result isn't my want.

jiangshachina wrote:[3]Don't show line between some times? (Green rectangle indicates)
JFreeChart use a line to connection two sequential points.
That's natural, but I don't want to show the chart/line in 11:30-13:00.
In fact, every stockmarket has its own work and rest time.
Then, howto?

This is a bug which occurs when the first tick mark falls right on the start of the axis. I'm still working out how to fix it properly.

(1) Set the axis range manually, with the value you require at the centre of the range.
(2) Override autoAdjustRange() method in the axis to calculate the data range but then extend it to ensure that your prespecified value falls in the centre.
You could also call plot.addRangeMarker(new ValueMarker(...)) to highlight the central value.

numberAxis.setRangeAboutValue(344.15, 6.5);

plot.addRangeMarker(new ValueMarker(344.15));

NumberTickUnit numberTickUnit = new NumberTickUnit(1.15, new DecimalFormat(".00"), 1);
numberAxis.setTickUnit(numberTickUnit);

If you add an item to the series with a null value (say at 12.00), then the connecting line will be broken.

// formatter is a DateFormat instance.
series.add(new TimeSeriesDataItem(new Minute(formatter.parse("200806111200")), null));

you can try
1、set your TimeRange from 09:29 to 15:01
2、
SegmentedTimeline segmented = new SegmentedTimeline(SegmentedTimeline.MINUTE_SEGMENT_SIZE, 1350, 90);

jiangshachina wrote:I have tried SegmentedTimeline(maybe too late *_*).

As mentioned above, the valid time ranges are: 09:30-11:30, 13:00-15:00.
I made a SegmentedTimeline:

Code: Select all

SegmentedTimeline segmented = new SegmentedTimeline(SegmentedTimeline.MINUTE_SEGMENT_SIZE, 1351, 89);
segmented.setBaseTimeline(SegmentedTimeline.newMondayThroughFridayTimeline());
// Starttime is 13:30
segmented.setStartTime(SegmentedTimeline.firstMondayAfter1900() + 780 * SegmentedTimeline.MINUTE_SEGMENT_SIZE);

The image is shown as the followings,

Obviously, the chart has a flaw(black rectangle indicates): The ticks 11:30 and 13:00 overlap each other.
How to resolve the trouble?

Additionally, can I erase the dashed at 11:30 and 13:00(blue rectangle indicates)?

Thanks!

RoyW wrote:For the gap you should take a look at SegmentedTimeline either in the JavaDoc or search the forum.

As for the highlighted central value this is something missing from JFreeChart. It would be nice to ba able to add annotations to the axis the same way you can to the plot. I find that for financial charts labels are required for the current price and other indicators. Your only solution in this case it to subclass the NumberAxis.
Here is a quick fix that only works for Vertical Charts with the Axis on the Right.

Code: Select all

NumberAxis  rangeAxis        = new NumberAxis("Price"){
            public List refreshTicks(Graphics2D g2, AxisState state, Rectangle2D dataArea, RectangleEdge edge) {
                List result = super.refreshTicks(g2, state, dataArea, edge);
                Tick tick = new NumberTick(344.15, "-----Close", TextAnchor.CENTER_LEFT, TextAnchor.CENTER_LEFT, 0.0);
                result.add(tick);

                return result;
            };
        }; 

Aniket_kedari wrote: I want to know how you drew the horizontal yellow line.

Aniket_kedari wrote: I don't see a horizontal yellow line. I see 2 charts in a CombinedDomainXYPlot on a yellow background