const h = 240;

​

let centreUv;

​

let heat

​

let climate = 0;

​

let heatFalloffSlider

let heatFalloff = 0.25

​

function setup() {

  createCanvas(w, h);

​

​

​

  snow = createVector(255, 255, 255);

  grass = createVector(0, 255, 0);

  dessert = createVector(255, 255, 0);

  hot = createVector(255,0,0)

  cold = createVector(255,255,255)

  heatFalloffSlider = createSlider( 0, 1, heatFalloff, 0.01)

  heatFalloffSlider.position(10, 250);

  heatFalloffSlider.input(heatFalloffSliderChanged);  

} 

​

function heatFalloffSliderChanged(){

  heatFalloff = heatFalloffSlider.value()

  console.log(heatFalloff)

  draw()

}

​

function draw() {

  background(0, 0, 0);

  noFill();

  noStroke();

  randomSeed(1)

  const  centreUv = createVector(0.5, 0.5);

  for (let y = 0; y < h; y++) {

    let climate = y / h - centreUv.y;

​

    for(let x = 0; x < w; x++)

    {

      let season = x / w - centreUv.x;

​

      let temp = getTemperature(season,climate, heatFalloff+ (sin(x * .05) * .025) )

      var heatX = lerp(cold.x, hot.x, temp)

      var heatY = lerp(cold.y, hot.y, temp)

      var heatZ = lerp(cold.z, hot.z, temp)

      set(x,y, color(heatX, heatY, heatZ))

    }

  }

  updatePixels()

  stroke(0);

  rect(0, 0, w, h);

  noLoop();

​

}

​

function getTemperature(uvX, uvY, heatFalloff) {

    const climate = abs(uvY) * 2;

    const heat = abs(uvX) * heatFalloff;

    const heatCurve = pow(sin((PI * heat) / 2), 1.5);

    let temp = 1 - max(climate - heatCurve, 0)

​

    return temp < heatFalloff ? 0 : temp;

}

​

​

​

​