Any way to add/use image for xVals?

[liebeskind]

I am trying to have text and UIImage show up next to each other on the x axis of a bar chart. Any suggestions on how to do this?

[danielgindi]

There's currently no support for that. You can try adding it yourself in the XAxisRenderer - or adding those externally with UIImageViews, taking the correct coordinates from the ViewPortHandler

[liebeskind]

Thanks Daniel. Is there any way to get an array of y coordinates for each xAxis line in a horizontal bar chart? I can then add UIImageViews to the Superview to externally place them at the .Top of each line.

I can't figure out how to get those values with ViewPortHandler.

[danielgindi]

The viewport tells you were content is drawn.
Then you can use the tranformer to convert x values to pixels (those are
the positions for the labels).
And there are properties that tell you which x indexes are visible

‏בתאריך יום רביעי, 3 ביוני 2015, Daniel [email protected] כתב:

Thanks Daniel. Is there any way to get an array of y coordinates for each
xAxis line in a horizontal bar chart? I can then add UIImageViews to the
Superview to externally place them at the .Top of each line.

I can't figure out how to get those values with ViewPortHandler.

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[liebeskind]

Any chance you have or know of any examples where this is done?

I know how to use the viewPort to get the content area using

barChartView.viewPortHandler.contentRect

but I am not sure how to get xAxis values or use the transformer to convert to pixels.

[danielgindi]

Give it a value of x=1,y=0 and it will convert that x to the proper pixel
value for xIndex 1. Same for 2 etc.

On Wed, Jun 3, 2015 at 6:44 PM, Daniel [email protected] wrote:

Any chance you have or know of any examples where this is done?

I know how to use the viewPort to get the content area using

barChartView.viewPortHandler.contentRect

but I am not sure how to get xAxis values or use the transformer to
convert to pixels.

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#126 (comment)
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[liebeskind]

Thanks Daniel - what method should I use on viewPortHandler to do this? What do I give a value of x=1, y=0 to?

[danielgindi]

The transformer, not the viewport. You need to ask the Chart to give you
the transformer

‏בתאריך יום רביעי, 3 ביוני 2015, Daniel [email protected] כתב:

Thanks Daniel - what method should I use on viewPortHandler to do this?
What do I give a value of x=1, y=0 to?

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#126 (comment)
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[liebeskind]

OK - I believe I've made a bit of progress. I set up the chart with:

var yVals: [BarChartDataEntry] = []
for idx in 0...numOptions {
        var index = "option\(idx)Votes"
        var votes = quest.objectForKey(index) as? Int
        if let vote = votes {
            yVals.append(BarChartDataEntry(value: Float(vote), xIndex: idx))
        }
    }

let set2 = BarChartDataSet(yVals: yVals, label: "Votes")
let dataBar = BarChartData(xVals: xVals, dataSet: set2)

Then I use ChartTransformer to generate values:

var somePoints = ChartTransformer(viewPortHandler: barChartView.viewPortHandler).generateTransformedValuesHorizontalBarChart(yVals, dataSet: 1, barData: dataBar, phaseY: 1.0)
println(somePoints)

[(1.0, 1.0), (1.0, 2.0), (1.0, 3.0), (1.0, 4.0)]

Then I try to convert the values to pixels:

ChartTransformer(viewPortHandler: barChartView.viewPortHandler).pointValuesToPixel(&somePoints)
    println(somePoints)

[(1.0, 1.0), (1.0, 2.0), (1.0, 3.0), (1.0, 4.0)]

It's clear that I'm doing something wrong, but feels like I'm on the right track. Thank you for your assistance so far - I continue to appreciate any guidance.

[liebeskind]

Daniel, thanks for your help with this. Figured it out.

var imagePos = barChartView.getPosition(yVals[opt], axis: .Left)

(219.090912112191, 270.833333333333)

Can then pull the x and y with

imagePos.y
imagePos.x

This is great! Very cool functionality.

[walinaqvi]

Hi @liebeskind where did you add these images so it scroll along with bars of graph ?

[Gagan6696]

Can you guys please share the sample. So that it becomes easy to use