Curly Waves - Maths317

We would be using the line formula in the circles chapter

Repeat the following steps to the number of waves you want divided by 2 .

1. Draw the first half of the circle with angles ranging from 90 to 270.
2. Draw the second half of the circl with angles ranging from 270 to 450.

Test Code

package main

import (
  "github.com/disintegration/imaging"
  "image/color"
  "math"
)

func main() {
  width := 500
  height := 300
  img := imaging.New(width, height, color.White)

  radius := 40

  x0 := 70
  y0 := 150

  numberOfWaves := 15
  for j := 1; j <= numberOfWaves; j++ {
    outOfMod := math.Mod(float64(j), 2.0)
    outOfModInt := int(math.Floor(outOfMod))

    if outOfModInt == 0 {

      for angle := 90; angle <= 270; angle++ {
        angleInRadians := float64(angle) * (math.Pi / 180)
        x := float64(radius) * math.Sin(angleInRadians)
        y := float64(radius) * math.Cos(angleInRadians)

        img.Set(x0 + int(x), y0 + int(y), color.Black)
      }

      x0 = x0 + (radius * 2)

    } else if outOfModInt == 1 {

      for angle := 270; angle <= 450; angle++ {
        angleInRadians := float64(angle) * (math.Pi / 180)
        x := float64(radius) * math.Sin(angleInRadians)
        y := float64(radius) * math.Cos(angleInRadians)

        img.Set(x0 + int(x), y0 + int(y), color.Black)
      }

      x0 = x0 + (radius * 2)
    }
  }

  err := imaging.Save(img, "curly_waves.png")
  if err != nil {
    panic(err)
  }
}