Why display each date in X-Axis 2 times?

Allen2009

Hi,

I create a chart and display Date in X-Axis,

Here is x-Axis:

Axis xAxisPrimary = cwaLine.getPrimaryBaseAxes()[0];

xAxisPrimary.setType(AxisType.DATE_TIME_LITERAL);

xAxisPrimary.getMajorGrid().setTickStyle(TickStyle.BELOW_LITERAL);
xAxisPrimary.getOrigin().setType(IntersectionType.MIN_LITERAL);
xAxisPrimary.getTitle().getCaption().setValue("Datum");
xAxisPrimary.getLabel().getCaption().getFont().setRotation(45);
xAxisPrimary.getTitle().setVisible(true);
xAxisPrimary.setFormatSpecifier(JavaDateFormatSpecifierImpl.create("dd/MM"));
xAxisPrimary.getMajorGrid().getLineAttributes().setVisible(true);
xAxisPrimary.getMajorGrid().getLineAttributes().setColor(ColorDefinitionImpl.WHITE());

I also tried xAxisPrimary.getScale().setUnit(ScaleUnitType.DAYS_LITERAL);

but it didnt change anything.

Anybody got an idea ?

Liang

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Comments

Allen2009

I got it,

add this one:
xAxisPrimary.getScale().setStep(1);

it means interval One Day.

Davolio

You need to make sure your x-axis is your category axis. If you do then BIRT will average the two points together, OTHERWISE you need to make your labels more specific so that each has a different label i.e. instead of 12/12/2009 have 12/12/2009 12:12:01.

Hope that helps,

Dave

Allen2009

hi Dave,

thanks for your reply !!

At First I set "xAxisPrimary.setCategoryAxis(false);"
then I got picture 1.

each Label on x-Axis has Gridline

if I set "xAxisPrimary.setCategoryAxis(true);
then I got picture 2, like you said. BIRT average 4 points

both work fine if I set :
xAxisPrimary.getScale().setUnit(ScaleUnitType.DAYS_LITERAL);
xAxisPrimary.getScale().setStep(1);

I set AxisType is DateTime, so I think 19/12 and 20/12 are different.

thanks again for you help!!

Liang