Sharp Waves - Maths317

We would be using the line formula in the lines chapter

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

1. Draw the first line with the angle increments with positive values.
2. Draw the second line with the angle increments with negative values.

Test Code

package main

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

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

  lengthOfLine := 100
  numberOfWaves := 15
  angle := 40
  x0 := 10
  y0 := 150
  // using increments of 1
  var x, y float64
  angleInRadians := float64(angle) * (math.Pi / 180)

  x = float64(x0)
  y = float64(y0)

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

    if outOfModInt == 0 {

      for i := 1; i < lengthOfLine; i++ {
        x1 := x + (math.Cos(angleInRadians) * 1)
        y1 := y + (math.Sin(angleInRadians) * 1)

        img.Set(int(math.Round(x1)), int(math.Round(y1)), color.Black)

        x = x1
        y = y1
      }

    } else if outOfModInt == 1 {

      for i := 1; i < lengthOfLine; i++ {
        x1 := x + (math.Cos(-angleInRadians) * 1)
        y1 := y + (math.Sin(-angleInRadians) * 1)

        img.Set(int(math.Round(x1)), int(math.Round(y1)), color.Black)

        x = x1
        y = y1
      }

    }

  }


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