Logarithmic scale for axis about plotters

[38]

I'm glad you finding its useful. Previously the logarithmic coordinate is planned but not yet support.

Now I implemented the coord spec, so that it can support log coordinate. Now you can pass LogRange wrapped range to specify the axis is log scale !

 let mut chart = ChartBuilder::on(&root)
        .x_label_area_size(25)
        .y_label_area_size(40)
        .caption("Histogram Test", &font)
        .build_ranged(0u32..10u32, LogRange(0u32..10u32));

Also, please note the library is in very early stage and I believe I am currently the only user.
But I am more than happy to get more and more people involved !

Hope this is helpful. Closing the issue, feel free to reopen it if you realize there's any problem.

[0x7CFE]

Now you can pass LogRange wrapped range to specify the axis is log scale !

Awesome, thanks! I will give it a try.

Also, please note the library is in very early stage and I believe I am currently the only user.

Sure, I understand that. Nevertheless, even for a young library plotter demonstrates an impressive amount of features. Looking forward for more to come!