[question] Does JBChartView support logarithmic scale?

[dodikk]

I need to implement a scatter plot with a logarithmic Y axis scale
See the link for details.
https://gist.github.com/dodikk/dbad6675a7ead2d322ced451495cac09

Is it feasible to use JBChartView?

P.S. I have not found any answers on Google, StackOverflow, etc.

[terryworona]

The library supports dots and solid/dashes lines out of the box.

The log scale is also fine - so long as your data model represents a log function.

The library is written in Objective C, so no worries there. It also has a bridging header for Swift integration.

The custom axis and background grids are also possible - but you'll have to spin that up yourself by subclassing the chart instance and poking around. It will require some work.

Hope this helps.

[dodikk]

@terryworona , thanks for the reply.

The log scale is also fine - so long as your data model represents a log function.

I have not quite understood this point. Could you, please explain the approach with more details?
I have not found a log scale axis class. For example, shinobi has one.

Thanks in advance.

[terryworona]

The y-axis will normalize itself across whatever data model you have.

So, if that model is a log(x) function, it will render fine. Check out the demo project and just change:

- (CGFloat)lineChartView:(JBLineChartView *)lineChartView verticalValueForHorizontalIndex:(NSUInteger)horizontalIndex atLineIndex:(NSUInteger)lineIndex
{
    return log(horizontalIndex);
}