Lighting control program for JSConf Iceland northern lights

northernlights.js

const { totalCols } = config

function crazyCaterpillar(time) {

  const newLights = new Lights()

  let dead = [];

  for (let i = 0; i < 3; i++) {
      dead.push(Math.round(Math.random() * totalCols));
  }

  for (let i = 0; i < totalCols; i++) {
    if (dead.indexOf(i) === -1) {
        const hue1 = (Math.round(360 / (totalCols / 2) * i) + (time * 300)) % 360;
        const hue2 = (Math.round(360 / (totalCols / 2) * (totalCols - i)) + (time * 400)) % 360;

        let saturation1 = 100;
        let saturation2 = 80;

        let lightness1 = (Math.sin(time * 10) + 1.0) * 20 + 30;
        let lightness2 = (Math.sin(time * 10) + 1.0) * 20 + 30;

        if (time % 1 < 0.02) {
            lightness1 = 10;
        }

        if (time % 1 > 0.04 && time % 1 < 0.08) {
            lightness2 = 90;
        }

        const color1 = Color().hsl(hue1, saturation1, lightness1);
        const color2 = Color().hsl(hue2, saturation2, lightness2);


        newLights.set(i, color1, color2);
    }
  }

  return newLights
}

function pride(time) {

  const newLights = new Lights()

  let dead = [];

  time = Math.sin(time) + 1;

  for (let i = 0; i < 0; i++) {
      dead.push(Math.round(Math.random() * totalCols));
  }

  for (let i = 0; i < totalCols; i++) {
    if (dead.indexOf(i) === -1) {
        const hue1 = (Math.round(360 / (totalCols / 2) * i) + (time * 400)) % 360;
        const hue2 = (Math.round(360 / (totalCols / 2) * (totalCols - i)) + (time * 400)) % 360;

        let saturation1 = 100;
        let saturation2 = 80;

        let lightness1 = (Math.sin(time * 10) + 1.0) * 20 + 30;
        let lightness2 = (Math.sin(time * 10) + 1.0) * 20 + 30;


        const color1 = Color().hsl(hue1, saturation1, lightness1);
        const color2 = Color().hsl(hue2, saturation2, lightness2);


        newLights.set(i, color1, color2);
    }
  }

  return newLights
}

function rolling(time) {

  const newLights = new Lights()

  newLights.set(Math.floor(time * 60 % totalCols), Color().hsl(0, 100, 50));
  newLights.set(Math.floor(totalCols - (time * 60 % totalCols)), Color().hsl(260, 100, 50));
  newLights.set(Math.floor(time * 90 % totalCols), Color().hsl(100, 100, 50));
  newLights.set(Math.floor(totalCols - (time * 90 % totalCols)), Color().hsl(150, 100, 50));

  newLights.set(Math.floor(time * 50 % totalCols), Color().hsl(60, 100, 50));
  newLights.set(Math.floor(totalCols - (time * 50 % totalCols)), Color().hsl(120, 100, 50));
  newLights.set(Math.floor(time * 30 % totalCols), Color().hsl(180, 100, 50));
  newLights.set(Math.floor(totalCols - (time * 20 % totalCols)), Color().hsl(240, 100, 50));

  return newLights
}

function update(currentLights, time) {
    //return rolling(time)
    if (time % 15 < 5) {
        return rolling(time)
    } else if (time % 15 < 10) {
        return pride(time);
    } else {
        return crazyCaterpillar(time);
    }
}

// Registers a visualization.
register(update)