I will review it this week. Sorry for the delay.

It still needs to be finished. I made the PR to show my approach. I was thinking of creating some builders to avoid cumbersome code like writing the whole Vec[Some(Box....)]. We could generate a builder from one item and another to make the axis from a vector, but I don't know what you think.

I found in examples/subplots/src/main.rs that we can generate more than 9 axis plotting by using this example:

fn many_subplots_with_titles() {
 let trace1 = Scatter::new(vec![1, 2], vec![4, 5]);
 let number_of_plots = 10;
 let mut plot = Plot::new();
 let mut layout = Layout::new()
 .grid(
 LayoutGrid::new()
 .rows(number_of_plots / 2)
 .columns(2)
 .pattern(GridPattern::Independent),
 )
 .height(number_of_plots * 200);
 for i in 1..number_of_plots + 1 {
 plot.add_trace(
 trace1
 .clone()
 .y_axis(format!("y{}", i))
 .x_axis(format!("x{}", i)),
 );
 layout.add_annotation(
 Annotation::new()
 .y_ref(format!("y{} domain", i))
 .y_anchor(Anchor::Bottom)
 .y(1)
 .text(format!("Title {}", i))
 .x_ref(format!("x{} domain", i))
 .x_anchor(Anchor::Center)
 .x(0.5)
 .show_arrow(false),
 )
 }
 plot.set_layout(layout);
 plot.set_configuration(Configuration::new().responsive(true));
 plot.show();
}

However, I still think the current changes can be useful since these new changes are handling another path. But I wanted to mention it

@yasuomaidana . I didn't manage to properly review your PR and I won't be in the next 2 weeks either. Will be back on it at end of August.

In general, it looks good. Indeed, I would prefer if we can abstract calls like these Vec[Some(Box....) behind a cleaner API. Or if we could avoid using Box altogether we will have shorter calling sequences.

I agree with you; I considered adding add_[AXIS]_axis to the append axis instead of using a building. I already did the builder, but after reading your feedback, I noticed that that solution is not contained in the API so that it will be more verbose.

Sorry, men, I was busy, but I back on this issue, I'll work on it this week

Sorry, men, I was busy, but I back on this issue, I'll work on it this week

Sorry @yasuomaidana , I was also quite busy. I will have a look at your proposal in the next 2-3 weeks.