CODEWITHSUNDEEP
reportlab
Ran Moshe
Ran Moshe

Reputation: 350

Marking a single bar in a ReportLab VerticalBarChart

I'm generating a bar chart using ReportLab VerticalBarChart. I need one of the bars (each time a different one) to be a different color than the rest, to specify it is the 'chosen' value.

Or else, I need to mark it differently than the other bars somehow.

Any idea how to do that?

Upvotes: 3

Views: 1110

Answers (3)

Kylie
Kylie

Reputation: 51

You need to use a sequence to access an individual bar. The snippet below sets the color for the first bar of the first data series.

chart.bars[(0,0)].fillColor = colors.red

Note: just passing through an index value e.g. chart.bars[0] will give you access the entire first data series

Upvotes: 5

Ran Moshe
Ran Moshe

Reputation: 350

Meitham's answer didn't work for me - it seems that chart.bars.fillColor[0] colors all the bars in a series. When you have more than one series in one chart, you can determine the color for each series by Meitham's method.

What I ended up doing is emphasizing the label (ix is the index for the parameter I needed to single out):

...
bc = VerticalBarChart()
...
bc.categoryAxis.labels[ix].fontName = 'Times-Bold'
bc.categoryAxis.labels[ix].fontSize = 15
bc.categoryAxis.labels[ix].angle = 30
bc.categoryAxis.labels[ix].dy = -15
drawing.add(bc)

You can search for this in the reportlab user manual.

Upvotes: 1

Meitham
Meitham

Reputation: 9670

You would want to do

chart.bars.fillColor = some_colour

and for the specific bar where x is an integer representing the number

chart.bars.fillColor[x] = special_colour

Upvotes: 2

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