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HTML

              
                <p id="loading">Loading...</p>
<main>  
  <svg id="svg" viewBox="0 0 1200 870" preserveAspectRatio="xMinYMin meet" style="enable-background:new 0 0 1200 870;">    
    <defs>
      <path id="path" d="M 331 162 C 359.8 129.7 399.1 107.2 441.3 97.6 C 483.5 88.1 528.4 91.5 569 106.5 C 609.6 121.4 645.8 147.8 673.1 181.4 C 700.5 214.9 719 255.4 727.4 297.8 C 744.2 382.7 719.1 473.6 666.4 542.2 C 613.7 610.8 535.1 657.6 451 678 C 408.1 688.4 363.4 692.3 319.6 687.1 C 275.7 681.9 232.7 667.4 196 643 C 159.2 618.6 128.8 584.1 111.3 543.5 C 93.8 503 89.7 456.4 102 414 C 110.9 383.3 128.2 355.1 151.5 333.2 C 174.7 311.3 203.8 295.6 234.8 288.1 C 265.9 280.7 298.9 281.3 329.6 289.9 C 360.4 298.4 389 314.8 412 337 C 449.9 373.5 472.2 426.5 468.6 479 C 466.8 505.3 458.7 531.1 444.8 553.5 C 430.9 575.8 411.2 594.6 388 607 C 355.9 624.2 317.5 628.9 282 621 C 254.9 615 229.2 601.7 209.7 581.9 C 190.2 562.1 177.2 535.7 175 508 C 173.5 488.9 177 469.6 184.7 452.1 C 192.3 434.6 204.1 418.9 218.4 406.3 C 247.2 381.1 285.8 368.5 324 368 C 365.7 367.4 406.7 380.5 443.5 400.1 C 480.3 419.7 513.3 445.7 545.2 472.6 C 577.1 499.4 608.2 527.4 642.2 551.5 C 676.2 575.6 713.5 596 754 606 C 801.2 617.6 851.9 614.4 897.6 597.6 C 943.2 580.8 983.7 550.5 1013.2 511.8 C 1042.8 473.2 1061.4 426.3 1067 378 C 1072.7 329.7 1065.5 280 1047 235 C 1026.5 185.1 992 140.9 947.8 110 C 903.7 79 849.9 61.6 796 62 C 753.9 62.3 711.8 73.5 675.8 95.1 C 639.7 116.7 609.8 148.9 592 187 C 572.6 228.5 567.9 276.6 577.8 321.4 C 587.6 366.1 611.7 407.5 645 439 C 674.9 467.2 711.4 487.4 748.3 505.3 C 785.3 523.3 823.3 539.4 858.3 561 C 893.2 582.7 925.4 610.4 945.4 646.4 C 955.3 664.4 962.1 684.2 964.1 704.7 C 966.1 725.1 963.2 746.2 955 765 C 947.2 782.8 934.7 798.4 919.6 810.6 C 904.5 822.8 886.9 831.8 868.4 837.8 C 831.5 849.7 791.7 849.8 753 846 C 648.1 835.7 545.9 796.8 462 733 C 398.4 684.6 345.4 621.9 310.9 549.9 C 276.5 477.8 260.8 396.5 269 317 C 274.8 260.7 293.3 204.2 331 162" />
    </defs>    
  </svg>
  <canvas id="view"></canvas>
</main>
              
            
!

CSS

              
                html, body {
  height: 100%;
}

body {
  overflow: hidden;
  background: black;
  color: #aaa;
}

main {
  position: relative;
  visibility: hidden;
  transform-origin: left top;
  height: 100%;
  width: 100%;
}

svg, canvas {
  position: absolute;
  width: 100%;
  height: 100%;
  max-height: 870px;
}

path {
  fill: none;
  stroke: #555;
  stroke-width: 2;
}

#loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

              
            
!

JS

              
                console.clear();

gsap.registerPlugin(MotionPathPlugin);

let baseURL = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/106114/";

let w = window.innerWidth;
let h = window.innerHeight;

let loader = new PIXI.loaders.Loader(baseURL)
  .add("fighter-02.json?v=4")
  .add("trail", "particle01.png?v=4")
  .load((loader, assets) => new Demo(assets));

//
// DEMO
// ===========================================================================
class Demo {
  constructor(assets) {

    this.last = performance.now();
    this.time = 0;
    this.size = { x: 1200, y: 870 };

    this.renderer = PIXI.autoDetectRenderer(this.size.x, this.size.y, {
      view: document.querySelector("#view"),
      backgroundColor: 0x000000,
    });

    this.stage = new PIXI.Container();
    this.fighter = new Fighter(this.stage, assets);

    window.addEventListener("resize", () => this.resize());

    gsap.ticker.add(() => this.render());

    this.resize();

    gsap.set("#loading", { autoAlpha: 0 });
    gsap.to("main", { autoAlpha: 1, duration: 0.5 });
  }

  render() {
    let current = performance.now();
    this.time = current - this.last;
    this.last = current;
    this.fighter.update(this.time);
    this.renderer.render(this.stage);
  }

  resize() {
    w = window.innerWidth;
    h = window.innerHeight;

    let ratio = Math.min(w / this.size.x, h / this.size.y);

    this.stage.scale.set(ratio);
    this.renderer.resize(w, h);
  }
}

//
// MOTION PATH
// ===========================================================================
class MotionPath {
  constructor(path) {
    let d = document.querySelector(path).getAttribute("d");
    let rawPath = MotionPathPlugin.stringToRawPath(d)[0];
    let values = this.values = [];

    for (let i = 0; i < rawPath.length; i += 2) {
      values.push({
        x: rawPath[i],
        y: rawPath[i + 1]
      });
    }

    this.lines = [];
    this.speeds = [];
    this.steps = 1000;

    this.speed = {
      now: 1,
      min: 0.5,
      max: 2.5,
      ratio: 0.5,
      step: 0.015,
    };

    this.bezier = {
      autoRotate: Math.PI / 2,
      path: this.values,
      type: "cubic",
      useRadians: true,
    };

    this.init();
  }

  init() {
    let speed = this.speed;
    let lines = this.lines;

    let obj = { x: 0, y: 0, rotation: 0 };

    let tween = gsap.to(obj, {
      paused: true,
      duration: 1,
      ease: "none",
      motionPath: {
        path: this.values,
        autoRotate: true,
        type: "cubic"
      }
    });

    // Loop through it twice to blend the start and end speeds together
    for (let loops = 0; loops < 2; loops++) {
      for (let i = 0; i <= this.steps; i++) {
        tween.progress(i * 0.001);

        let rot = obj.rotation % 90;
        let sign = rot < 0 ? -1 : 1;
        let mult = Math.abs(rot / 90);
        let diff = speed.ratio + speed.step * sign * mult || 0;

        speed.ratio = gsap.utils.clamp(0, 1, diff);

        if (!loops) continue;

        let color = lerpColor(speed.ratio);

        lines.push({ color, x: obj.x, y: obj.y });

        speed.now = gsap.utils.interpolate(speed.min, speed.max, speed.ratio);

        this.speeds.push(speed.now);
      }

      speed.now = gsap.utils.interpolate(speed.min, speed.max, speed.ratio);
    }

    this.plotSpeed();
  }

  plotSpeed() {
    let graphics = new PIXI.Graphics();

    let size = this.lines.length;
    let prev = this.values[0];

    for (let i = 0; i < size; i++) {
      let line = this.lines[i];

      graphics.beginFill(line.color);
      graphics.lineStyle(4, line.color);
      graphics.drawPolygon(prev.x, prev.y, line.x, line.y, prev.x, prev.y);
      graphics.endFill();

      prev = line;
    }

    let box = graphics.getBounds();

    graphics.lineStyle(0);
    graphics.beginFill(0x000000, 0);
    graphics.drawRect(0, 0, box.x + box.width, box.y + box.height);

    this.texture = graphics.generateTexture();
    this.sprite = new PIXI.Sprite(this.texture);

    graphics.destroy();
  }
}

//
// FIGHTER
// ===========================================================================
class Fighter {
  constructor(parent, assets) {
    this.stallSpeed = 0.55;

    this.sprite = new FighterSprite();

    this.spriteContainer = new PIXI.Container();
    this.emitterContainer = new PIXI.Container();

    this.emitter = new Emitter(this.emitterContainer, assets.trail.texture);
    this.motionPath = new MotionPath("#path");

    this.speeds = this.motionPath.speeds;

    this.bezierTween = gsap.to(this.spriteContainer, {
      duration: 5,
      paused: true,
      ease: "none",
      motionPath: this.motionPath.bezier
    });

    this.progressTween = gsap.to(this.bezierTween, {
      duration: 5,
      progress: 1,
      repeat: -1,
      ease: "none",
      onStart: this.setSpeed,
      onUpdate: this.setSpeed,
      callbackScope: this
    });

    this.spriteContainer.addChild(this.sprite);

    parent.addChild(this.motionPath.sprite);
    parent.addChild(this.emitterContainer);
    parent.addChild(this.spriteContainer);

    this.emitter.emit = true;
  }

  get x() {
    return this.spriteContainer.x;
  }
  get y() {
    return this.spriteContainer.y;
  }

  setSpeed() {
    let index = Math.round(this.progressTween.progress() * 1000);
    let speed = this.speeds[index];

    gsap.to(this.progressTween, { timeScale: speed, duration: 0.2 });

    if (speed < this.stallSpeed && !this.sprite.inRoll) {
      this.sprite.roll();
    }
  }

  update(time) {
    this.emitter.spawn(this.x, this.y, time * 0.001);
  }
}

//
// FIGHTER SPRITE
// ===========================================================================
class FighterSprite extends PIXI.Sprite {
  constructor() {
    super();

    this.total = 30;
    this.frames = new Array(this.total);

    for (let i = 0; i < this.total; i++) {
      var frame = `rollSequence00${i < 10 ? "0" + i : i}.png`;
      this.frames[i] = PIXI.Texture.fromFrame(frame);
    }

    this.anchor.set(0.5, 0.6);
    this.pivot.set(0.5);

    this.frame = 0;
    this.inRoll = false;
  }

  get frame() {
    return this._frame;
  }
  set frame(n) {
    n = n % this.total;
    this._frame = n;
    this.texture = this.frames[n];
  }

  roll() {
    this.inRoll = true;

    gsap.to(this, {
      duration: 1,
      frame: this.total,
      ease: "none",
      snap: "frame",
      onComplete: () => this.inRoll = false
    });
  }
}

//
// EMITTER
// ===========================================================================
class Emitter {
  constructor(container, texture) {
    this.container = container;

    this.emitter = new cloudkid.Emitter(this.container, [texture], {
      alpha: { start: 0.8, end: 0.1 },
      scale: { start: 1, end: 0.3, minimumScaleMultiplier: 1 },
      color: { start: "#e3f9ff", end: "#0ec8f8" },
      speed: { start: 0, end: 0 },
      acceleration: { x: 0, y: 0 },
      startRotation: { min: 0, max: 0 },
      rotationSpeed: { min: 0, max: 0 },
      lifetime: { min: 0.4, max: 0.4 },
      blendMode: "normal",
      frequency: 0.008,
      emitterLifetime: -1,
      maxParticles: 1000,
      pos: { x: 0, y: 0 },
      addAtBack: false,
      spawnType: "point",
    });
  }

  set emit(flag) {
    this.emitter.emit = flag;
  }

  spawn(x, y, time) {
    this.emitter.updateSpawnPos(x, y);
    this.emitter.update(time);
  }
}

//
// LERP COLOR
// ===========================================================================
function lerpColor(progress = 0) {
  let color1 = [255, 0, 0];
  let color2 = [0, 255, 0];
  let rgb = [];

  for (let i = 0; i < 3; i++) {
    let rgb1 = Math.pow(color1[i], 2);
    let rgb2 = Math.pow(color2[i], 2);

    rgb[i] = Math.round(Math.sqrt(gsap.utils.interpolate(rgb1, rgb2, progress)));
  }

  return (1 << 24) + (rgb[0] << 16) + (rgb[1] << 8) + rgb[2];
}


              
            
!
999px

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