Function getKochSnowflake

Recursive/KochSnowflake.manual-test.js:10–30

* Method to render the Koch snowflake to a canvas. * * @param canvasWidth The width of the canvas. * @param steps The number of iterations. * @returns The canvas of the rendered Koch snowflake.

(canvasWidth = 600, steps = 5)

 * @returns The canvas of the rendered Koch snowflake.
 */
function getKochSnowflake(canvasWidth = 600, steps = 5) {
  if (canvasWidth <= 0) {
    throw new Error('canvasWidth should be greater than zero')
  }

  const offsetX = canvasWidth / 10.0
  const offsetY = canvasWidth / 3.7
  const vector1 = new Vector2(offsetX, offsetY)
  const vector2 = new Vector2(
    canvasWidth / 2,
    Math.sin(Math.PI / 3) * canvasWidth * 0.8 + offsetY
  )
  const vector3 = new Vector2(canvasWidth - offsetX, offsetY)
  const initialVectors = []
  initialVectors.push(vector1)
  initialVectors.push(vector2)
  initialVectors.push(vector3)
  initialVectors.push(vector1)
  const vectors = iterate(initialVectors, steps)
  return drawToCanvas(vectors, canvasWidth, canvasWidth)
}

/**
 * Utility-method to render the Koch snowflake to a canvas.