waves.typ

#import "@preview/cetz:0.3.2": canvas, draw, vector, matrix

#set page(width: auto, height: auto, margin: .5cm)

#canvas({
  import draw: *

  ortho(y: -30deg, x: 30deg, {
    on-xz({
      grid((0,-2), (8,2), stroke: gray + .5pt)
    })

    // Draw a sine wave on the xy plane
    let wave(amplitude: 1, fill: none, phases: 2, scale: 8, samples: 100) = {
      line(..(for x in range(0, samples + 1) {
        let x = x / samples
        let p = (2 * phases * calc.pi) * x
        ((x * scale, calc.sin(p) * amplitude),)
      }), fill: fill)

      let subdivs = 8
      for phase in range(0, phases) {
        let x = phase / phases
        for div in range(1, subdivs + 1) {
          let p = 2 * calc.pi * (div / subdivs)
          let y = calc.sin(p) * amplitude
          let x = x * scale + div / subdivs * scale / phases
          line((x, 0), (x, y), stroke: rgb(0, 0, 0, 150) + .5pt)
        }
      }
    }

    on-xy({
      wave(amplitude: 1.6, fill: rgb(0, 0, 255, 50))
    })
    on-xz({
      wave(amplitude: 1, fill: rgb(255, 0, 0, 50))
    })
  })
})