I am trying make a plot with the background colors different for each section of the y-axis. For example: using Plots gr() plot(Plots.fakedata(50, 1), w=3, fill = (0, 0.2, :red)) generates the image: [example] I want to fill the background of the graph with different colors. Like the area from …

Do you mean something like this? using Plots gr() data = Plots.fakedata(50,2) p = plot(data, w=3); hspan!(p,[0,maximum(data)], color = :green, alpha = 0.2, labels = "good"); hspan!(p,[minimum(data),0], color = :red, alpha = 0.2, labels = "bad"); display(p) # or savefig(p, "filename.png") [display] …

[image] Sukera: savefig(p, “filename.png”) Thanks @Sukera . This is exactly what I was trying to do!

That’s great! If my post solved your problem, please mark it as the solution so other people know that your question has been answered :slight_smile:

Is it possible to apply a gradient rather than a static color array to the background fill? It’s straightforward to apply it to a curve/scatter plot, but I can’t get the background gradient to work (using Plots).

Thanks! I’ll have to take some time to understand that code. I think I found fill might actually work better for my application: reflectance spectrum as a function of wavelength in the visible range. [a]

In reviewing this post, it appears that the following code more directly answers the OP’s question: [plot_gr_threshold_filled_areas] NB: Congratulazioni Italia! using Plots; gr() theme(:dark) x = LinRange(0,π,2021); y = 2*cos.(x) ymin, ymax = extrema(y) c = [-1.; 1.] # BAD < -1 ; -1 < OK < …

Julia plots: How to fill graph background with different colors

General Usage

rafael.guerra March 26, 2021, 8:52pm 6

Check this past post for a beautiful solution by @klaff using Plots, Colors and PolygonOps.

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Julia plots: How to fill graph background with different colors

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