Changing line weight and font in plotlyjs

When working with plotlyjs in Julia, you may come across the need to change the line weight and font in your plots. This article will explore three different ways to achieve this, each with its own advantages and disadvantages.

Option 1: Using the `layout` attribute

One way to change the line weight and font in plotlyjs is by modifying the `layout` attribute of your plot. This can be done by accessing the `layout` property of your plot object and setting the desired attributes.


# Julia code
plot = PlotlyJS.plot(data, layout)
plot.layout[:font][:size] = 14
plot.layout[:line][:width] = 2

This approach allows you to directly modify the line weight and font size for the entire plot. However, it may not be suitable if you want to change these attributes for specific elements within the plot.

Option 2: Using the `trace` attribute

If you want to change the line weight and font for specific elements within your plot, you can use the `trace` attribute. This attribute allows you to modify the properties of individual traces in your plot.


# Julia code
trace = plot.data[1]
trace[:line][:width] = 2
trace[:textfont][:size] = 14

By accessing the desired trace within your plot’s `data` attribute, you can modify the line weight and font size for that specific trace. This approach provides more flexibility compared to Option 1.

Option 3: Using CSS styling

If you prefer to separate the styling from your Julia code, you can use CSS to change the line weight and font in plotlyjs. This approach involves adding a CSS class to your plot’s HTML container and defining the desired styles in a separate CSS file.


# Julia code
plot = PlotlyJS.plot(data, layout, config)
plot_div = plotjs(plot, div_id="my-plot")
HTML("""

""", plot_div)

By adding the CSS class `.my-plot` to your plot’s HTML container, you can define the desired line weight and font size in a separate CSS file. This approach provides the most flexibility and allows you to easily reuse the styling for multiple plots.

After exploring these three options, it is clear that Option 3, using CSS styling, is the best choice. It provides the most flexibility and separation of concerns, allowing you to easily modify the line weight and font size for specific elements within your plot. Additionally, CSS styling allows for easy reuse of styles across multiple plots, making it a more scalable solution.

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