Hi Hernán,

I am not sure what exactly is the problematic situation you describe. Why you cannot simply with with #minX: and #maxX: ?

For example, I tried to reuse the code you have provided. I can have:

    bins := #(#(1 1 1 1 ) #(2 2 2) #(5 5 5 5 5)).
    minPoint := ((bins reject: #isEmpty) detectMin: [ : c | c size ]) anyOne.

    " Build diagram "
    g := RTGrapher new 
            extent: 500 @ 200; 
            minX: 0;
maxX: 6;
            withoutOrigin;
            yourself.
    ds := RTData new
        points: bins;
        x: [ : c | c ifEmpty: [ minPoint ] ifNotEmpty: [ : d | d anyOne ] ];
        y: #size.
    ds barShape 
        borderColor: Color black;
        color: Color red trans;
width: 30.
    g add: ds.

    g 

But you can have "minX: 1", which in that case, the first bar is above the Y-Axis. This is what one would expect. 

Which rendering do you wish to have? Can you provide a self-contained piece of code that I can run on my machine?

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

On Jun 15, 2017, at 1:16 AM, Hernán Morales Durand <hernan.morales@gmail.com> wrote:

Hi guys,

I am experiencing a problem visualizing histograms in Roassal with Pharo 5. In the attached image you can observe the first bar shape starts from a negative X axis value, where I want to start from 0. Besides, some bars are gapped but I don't know why.

I am using with the following code:

    | bins minPoint g ds |
   
    bins := self groupedBySeqLengthDistribution: binNumber.
    minPoint := ((bins reject: #isEmpty) detectMin: [ : c | c size ]) anyOne size.

    " Build diagram "
    g := RTGrapher new
            extent: 500 @ 200;
            minX: minPoint;
            withoutOrigin;
            yourself.
    ds := RTData new
        points: bins;
        x: [ : c | c ifEmpty: [ minPoint ] ifNotEmpty: [ : d | d anyOne size ] ];
        y: #size.
    ds barShape
        borderColor: Color black;
        color: aColor;
        width: barWidth.
    g add: ds.

    " Configure axis settings "
    g axisY
        title: axixYLabel;
        color: Color black;   
        noDecimal.
    g axisX
        noDecimal;   
        fromPoint: minPoint;
        color: Color black;
        title: axisXLabel.
    " Open visualization in a new window "
    g open.

Any idea what I am missing?

Cheers,

Hernán
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