Resolution

[joelmce]

Hey there,
I'm testing out the resolution parameters for the flow function, but it seems that no matter what integer I use I am received with the same output in terms of resolution quality. Is this a bug or is there something I'm missing?

Many thanks,
Joel

[koenderks]

Hey!

Yeah good point... I believe the purpose of the resolution parameter in this function was to allow for a larger canvas (e.g., the idea was that using more angles should yield more fine grained/flexible lines), but since this algorithm using a (fixed) maximum step size of resolution * 0.01 the resolution parameter does not have the intended effect. Instead, it might be a better idea to replace this parameter with something like stepmax, which allows you to set the maximum step size for each iteration of each line (i.e., larger values of stepmax yield longer lines and smaller values yield shorter lines). I'll play around with this. For example, the output may vary like this:

canvas_flow(colors = colorPalette("dark2"), stepmax = 0.01)

canvas_flow(colors = colorPalette("dark2"), stepmax = 0.001)

`

By the way, if you want to increase the resolution quality of the output, it is advised to do this when exporting the plot. For example, the saveCanvas() function (which is basically a wrapper for ggsave()) uses a standard quality of dpi = 300, but if you set this to a higher number the quality of the image will increase.

x <- canvas_flow(colors = colorPalette("dark2"))
saveCanvas(x, filename = "x.png", dpi = 300) # Standard quality = ggsave(x, filename = "x.png", height = 7, widht = 7, dpi = 300, units = "cm")
saveCanvas(x, filename = "x2.png", dpi = 1000) # Better quality = ggsave(x, filename = "x.png", height = 7, widht = 7, dpi = 1000, units = "cm")

[joelmce]

I see now, appreciate the rapid response. Love your work by the way!