worn and wittled by wind and worry

//For the #wccChallenge on the theme of 'eroded'.

​

let colors = ["#4e5a5a", "#919898", "#fff0b6", "#964301", "#560000"]

let simplex, skyTexture

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  simplex = new openSimplexNoise(Date.now())

  skyTexture = createGraphics(width, height)

  pixelDensity(1)

  skyTexture.pixelDensity(1)

  skyTexture.background("#8e939f");

  let stroker = color(0)

  for (let x = 0; x < width; x++) {

    for (let y = 0; y < height; y += floor(random(0, 3))) {

      let avalue = map(simplex.noise2D(x / 400, y / 65), -1, 1, 0, 255)

      stroker.setAlpha(avalue)

      skyTexture.stroke(stroker)

      skyTexture.point(x, y)

​

    }

  }

​

  noStroke()

  let tinter = color("#a34eae")

  tinter.setAlpha(235)

  fill("#4e5a5a")

  rect(0, height * 0.9, width, height * 0.3)

  for (let i = 0; i < 15; i++) {

    fill("#4e5a5a")

    rect(0, height * 0.9, width, height * 0.3)

    for (let x = 0; x < width + height * 0.2; x += height * 0.25) {

      let xOffset = simplex.noise2D(x, i / 5) * height * 0.2

      let h = height * 0.5 + simplex.noise2D(x, i / 2) * height * 0.33

      let shade = 0

      if (i > 10) {

        shade = 1

      }

      eroded(x + xOffset, height, h, height * 0.33, i / 2, shade)

    }

    let g = get()

    clear()

    push()

    tint(tinter)

    image(g, 0, -height * 0.02)

    pop()

  }

  let g = get()

  background("#8e939f")

  blendMode(BLEND)

  image(g, 0, height * 0.1)

​

  for (let x = 0; x < width; x += height * 0.25) {

    let xOffset = simplex.noise2D(x, 3.5) * height * 0.2

    let h = height * 0.5 + simplex.noise2D(x, 8) * height * 0.33

    eroded(x + xOffset, height, h, height * 0.33, 8, 1)

  }

  blendMode(HARD_LIGHT)

  push()

  tint(255, 30)

  image(skyTexture, 0, 0)

  pop()

}

​

function eroded(x, y, h, w, seed, shade) {

  //x, y is center of base, w is max width

  noStroke()

  push()

  translate(x, y)

  for (let elev = 0; elev < h; elev++) {

    fill(colorMixer(elev, x / 10, seed, colors))

    let adjW = map(elev, 0, h, w * 1.2, w * 0.3)

    let rw = noise(elev / 100, x + y) * adjW

    let jiggle = simplex.noise2D(elev / 20, x * 2) * (adjW * 0.01)

    ellipse(jiggle, -elev, rw, 4)

  }

​

  if (shade == 1) {

    push()

    blendMode(MULTIPLY)

    for (let elev = 0; elev < h; elev++) {

      let adjW = map(elev, 0, h, w * 1.2, w * 0.3)

      let rw = noise(elev / 100, x + y) * adjW

      let jiggle = simplex.noise2D(elev / 20, x * 2) * (adjW * 0.01)

      let shading = map(noise(elev / 100, x + y), 0, 1, 255, 0)

      strokeWeight(1.2)

      stroke(0, shading)

      noFill()

      arc(jiggle, -elev, rw, 4, 0, PI)

    }

​

    pop()

  }

​

  pop()

}

​

function colorMixer(elev, pos, seed, colorArray) {

  let c = noise(elev / 75, pos, seed) * colorArray.length

  let c1 = floor(c)

  let c2 = floor(c + 1) % colorArray.length

  let color1 = colorArray[c1]

  let color2 = colorArray[c2]

  let mix = fract(c)

  let coloring = color(spectral.mix(color1, color2, mix))

  return coloring

}