[NB: forwarded to the moose mailing list as other may be interested in this]

Hi Thomas,

This is a tricky situation, for which I have found a solution. 

Consider the script

-=-=--=-=--=-=--=-=-

b := RTGrapher new.

d := RTData new.
d points: #(3 4 5).
d barShape.
b add: d.

b axisX noLabel; noTick.
b

-=-=--=-=--=-=--=-=-

produces 

As always. 

You can now send #noAlignmentOffset to the data to remove the offset.

-=-=-=-=-=-=

b := RTGrapher new.

d := RTData new.
d points: #(3 4 5).
d barShape.
d noAlignmentOffset.
b add: d.

b axisX noLabel; noTick.
b

-=-=-=-=-=-=

produces:

It is visually less appealing, however it works well when you combine it with other data sets:

-=-=-=-=-=-=
b := RTGrapher new.

d := RTData new.
d points: #(3 4 3.5).
d barShape.
d noAlignmentOffset.
b add: d.

d := RTData new.
d points: #(3 4 3.5).
d connectColor: Color red.
b add: d.

b

-=-=-=-=-=-=

This is committed in Pharo

Alexandre

On Oct 15, 2015, at 7:27 AM, Thomas Brodt <thomas.brodt@porabo.ch> wrote:

Hi Alexandre, hi Milton

today I upgraded to the new version 2.35 of Roassal for Visualworks. It gets better each time!

Unfortunately we have an issue with the new RTData. As the old RTStackedDataSet is obsolete now, we moved all our charts to RTData.

In some charts where we have bars mixed with lines, the dots of the line graph are no longer aligned with the center of the bars, as it was before with RTStackedDataSet. If I change the RTData for the line graph to RTStackedDataSet, the alignment works again.

Here is an example script:

| b ds |
   b := RTGrapher new.
   ds := RTData new.
   (ds barShape)
       width: 15;
       if: [:v | v < 0] fillColor: Color red;
       if: [:v | v > 0] fillColor: Color green.
   ds points: #(5 -6 10 20 -9).
   b add: ds.

   ds := RTStackedDataSet new.
   ds
       points: #(4 -2 11 16 -10);
       connectColor: Color red;
       connect.
   ds dotShape color: Color blue.
   ds lineShape color: Color blue.
   b add: ds.

   ds := RTData new.
   ds
       points: #(4 -2 11 16 -10);
       connectColor: Color red;
       connect.
   ds dotShape color: Color red.
   ds lineShape color: Color red.
   b add: ds.


   (b axisX)
       noLabel;
       noTick.
   b axisY noDecimal.
   b build.
   b view


In the example, there are two lines with the same values, one using RTData, and one using RTStackedDataSet. And they have different positions, while I think they should be aligned.

Maybe you can have a look at that?
Thanks,

Thomas

-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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