A Pen by Blake Bowen on CodePen.
Created
March 17, 2022 13:22
-
-
Save pauvretimo/a5f0558ded44cfba09c3ae862c7e34c2 to your computer and use it in GitHub Desktop.
Waves
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <canvas id="canvas"></canvas> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| let canvas = document.getElementById("canvas"); | |
| let context = canvas.getContext("2d"); | |
| let resolution = window.devicePixelRatio || 1; | |
| let waves = []; | |
| let resized = false; | |
| let vw, vh; | |
| resizeCanvas(); | |
| let wave1 = createWave(context, { | |
| amplitude: 50, | |
| duration: 4, | |
| fillStyle: "rgba(103,58,183,0.8)", | |
| frequency: 2.5, | |
| width: vw, | |
| height: vh, | |
| segments: 100, | |
| waveHeight: vh * 0.25 | |
| }); | |
| let wave2 = createWave(context, { | |
| amplitude: 100, | |
| duration: 2, | |
| fillStyle: "rgba(63,81,181,0.7)", | |
| frequency: 1.5, | |
| width: vw, | |
| height: vh, | |
| segments: 100, | |
| waveHeight: vh * 0.25 | |
| }); | |
| waves.push(wave1, wave2); | |
| gsap.to(waves, { | |
| duration: 10, | |
| waveHeight: vh / 2, | |
| ease: "sine.inOut", | |
| repeat: -1, | |
| repeatDelay: 1, | |
| yoyo: true | |
| }); | |
| gsap.to(wave1, { | |
| duration: 6, | |
| amplitude: 10, | |
| ease: "sine.inOut", | |
| repeat: -1, | |
| yoyo: true | |
| }); | |
| gsap.to(wave2, { | |
| duration: 7, | |
| amplitude: 25, | |
| ease: "sine.inOut", | |
| repeat: -1, | |
| yoyo: true | |
| }); | |
| window.addEventListener("resize", () => { | |
| resized = true; | |
| }); | |
| gsap.ticker.add(update); | |
| function update() { | |
| let len = waves.length; | |
| if (resized) { | |
| resizeCanvas(); | |
| for (let i = 0; i < len; i++) { | |
| waves[i].resize(vw, vh); | |
| } | |
| resized = false; | |
| } | |
| context.clearRect(0, 0, vw, vh); | |
| context.globalCompositeOperation = "soft-light"; | |
| for (let i = 0; i < len; i++) { | |
| waves[i].draw(); | |
| } | |
| } | |
| function createWave(context, options) { | |
| options = options || {}; | |
| // API | |
| let wave = { | |
| // Properties | |
| amplitude: options.amplitude || 200, | |
| context: context, | |
| curviness: options.curviness || 0.75, | |
| duration: options.duration || 2, | |
| fillStyle: options.fillStyle || "rgba(33,150,243,1)", | |
| frequency: options.frequency || 4, | |
| height: options.height || 600, | |
| points: [], | |
| segments: options.segments || 100, | |
| tweens: [], | |
| waveHeight: options.waveHeight || 300, | |
| width: options.width || 800, | |
| x: options.x || 0, | |
| y: options.y || 0, | |
| // Methods | |
| init: init, | |
| resize: resize, | |
| draw: draw, | |
| kill: kill | |
| }; | |
| init(); | |
| function kill() { | |
| let tweens = wave.tweens; | |
| let len = tweens.length; | |
| for (let i = 0; i < len; i++) { | |
| tweens[i].kill(); | |
| } | |
| tweens.length = 0; | |
| wave.points.length = 0; | |
| } | |
| function init() { | |
| kill(); | |
| let segments = wave.segments; | |
| let interval = wave.width / segments; | |
| for (let i = 0; i <= segments; i++) { | |
| let norm = i / segments; | |
| let point = { | |
| x: wave.x + i * interval, | |
| y: 1 | |
| }; | |
| let tween = gsap.to(point, { | |
| duration: wave.duration, | |
| y: -1, | |
| repeat: -1, | |
| yoyo: true, | |
| ease: "sine.inOut" | |
| }).progress(norm * wave.frequency) | |
| wave.tweens.push(tween); | |
| wave.points.push(point); | |
| } | |
| } | |
| function draw() { | |
| let points = wave.points; | |
| let len = points.length; | |
| let startY = wave.waveHeight; | |
| let height = wave.amplitude / 2; | |
| context.beginPath(); | |
| context.moveTo(points[0].x, startY + points[0].y * height); | |
| for (let i = 1; i < len; i++) { | |
| let point = points[i]; | |
| context.lineTo(point.x, startY + point.y * height); | |
| } | |
| context.lineTo(wave.x + wave.width, wave.y + wave.height); | |
| context.lineTo(wave.x, wave.y + wave.height); | |
| context.closePath(); | |
| context.fillStyle = wave.fillStyle; | |
| context.fill(); | |
| } | |
| function resize(width, height) { | |
| wave.width = width; | |
| wave.height = height; | |
| let points = wave.points; | |
| let len = points.length; | |
| let interval = wave.width / wave.segments; | |
| for (let i = 0; i < len; i++) { | |
| let point = points[i]; | |
| point.x = wave.x + i * interval; | |
| } | |
| } | |
| return wave; | |
| } | |
| function resizeCanvas() { | |
| vw = window.innerWidth; | |
| vh = window.innerHeight; | |
| canvas.width = vw * resolution; | |
| canvas.height = vh * resolution; | |
| canvas.style.width = vw + "px"; | |
| canvas.style.height = vh + "px"; | |
| context.scale(resolution, resolution); | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <script src="https://unpkg.co/gsap@3/dist/gsap.min.js"></script> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #canvas { | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment