What is the best way to scale a plot?

[TheJanzap]

I have a plot that I would like to include in documents with different sizes. I tried messing around with the size parameter, but this did not produce good results. Are there better ways to scale a plot?

#let horizontal-throw(scaling: 1) = {
  canvas(length: 2em, {
    import draw: *
    import calc: pow

    let g = 9.81
    let v_0 = 10
    let h = 5

    set-style(
      stroke: (thickness: 0.1em),
      mark: (length: 0.7em, width: 0.4em),
      axes: (tick: (stroke: 0.1em, length: 0.5em))
    )
    
    plot.plot(
      size: (5 * scaling, 6 * scaling),
      y-label: $h$,
      axis-style: "left",
      {
        plot.add(domain: (0, 10.1), x => -g/2 * pow(x/v_0, 2) + h)
    })
  })
}

#horizontal-throw()

#set text(size: 3pt)

#horizontal-throw(scaling: 0.6)

[johannes-wolf]

Maybe:

scale(scaling)
set-style(content: (auto-scale: true), mark: (transform-shape: true))

does what you expect:

#import "@preview/cetz:0.5.2": *
#import "@preview/cetz-plot:0.1.4": *

#let horizontal-throw(scaling: 1) = {
  canvas({
    import draw: *
    import calc: pow

    let g = 9.81
    let v_0 = 10
    let h = 5

    set-style(
      stroke: (thickness: 0.1em),
      mark: (length: 0.7em, width: 0.4em),
      axes: (tick: (stroke: 0.1em, length: 0.5em))
    )
    
    scale(scaling)
    set-style(content: (auto-scale: true), mark: (transform-shape: true))
    
    plot.plot(
      size: (5, 6),
      y-label: $h$,
      axis-style: "left",
      {
        plot.add(domain: (0, 10.1), x => -g/2 * pow(x/v_0, 2) + h)
    })
  })
}

#horizontal-throw()

#horizontal-throw(scaling: 0.6)

[TheJanzap]

It does work quite well when the scaling is applied with scaling() and not to canvas: length. However I removed content: (auto-scale: true) as that was making the axis text illegibly small.

Here is my final code

#let horizontal-throw(scaling: 1) = {
  canvas({
    import draw: *
    import calc: pow

    let g = 9.81
    let v_0 = 10
    let h = 5

    
    set-style(
      stroke: (thickness: 0.1em),
      mark: (length: 0.7em, width: 0.4em),
      axes: (tick: (stroke: 0.1em, length: 1.3em)),
    )

    scale(scaling)
    
    plot.plot(
      size: (7, 6),
      y-label: $h$,
      axis-style: "left",
      {
        plot.add(domain: (0, 10.1), x => -g/2 * pow(x/v_0, 2) + h)
    })
  })
}

#horizontal-throw(scaling: 0.9)

#set text(size: 3pt)

#horizontal-throw(scaling: 0.23)