Smalltalk - Re: Roassal histogram bars left shifted

Re: Roassal histogram bars left shifted

Posted by cbc on Jun 16, 2017; 4:50pm
URL: https://forum.world.st/Roassal-histogram-bars-left-shifted-tp4951472p4951698.html

Hi,

I suspect your issue I want a bug per se. Your x axis starts at the first bar x location. The bars are going to be centered on the point - meaning it will overlap to the left (or negative) side.

As for the gaps I suspect that has to do with the data. The bars have a width and the space between each point is very small - so there will be overlap. And space for x values that aren't in your data (giving you the gaps).

Did you want instead each bar next to the next and individually labbeled?

On Jun 14, 2017 10:16 PM, "Hernán Morales Durand" <[hidden email]> 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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