m |
m |
||
Line 11: | Line 11: | ||
var wave = el.querySelector('.animWavePath'); | var wave = el.querySelector('.animWavePath'); | ||
− | let myWaveParams = waveParams[el]; | + | let myWaveParams = waveParams[el.id]; |
function calculateWavePoints(factor) { | function calculateWavePoints(factor) { | ||
− | myWaveParams = waveParams[el]; | + | myWaveParams = waveParams[el.id]; |
let points = []; | let points = []; | ||
Line 99: | Line 99: | ||
function makeWave(element, setWaveParamsFunction = setWaveParams_default){ | function makeWave(element, setWaveParamsFunction = setWaveParams_default){ | ||
− | waveParams[element] = setWaveParamsFunction(); | + | waveParams[element.id] = setWaveParamsFunction(); |
initializeWaveAnimation(element); | initializeWaveAnimation(element); | ||
window.addEventListener("resize", () => { | window.addEventListener("resize", () => { | ||
− | waveParams[element] = setWaveParamsFunction(); | + | waveParams[element.id] = setWaveParamsFunction(); |
}); | }); | ||
window.addEventListener('load', () => { | window.addEventListener('load', () => { | ||
− | waveParams[element] = setWaveParamsFunction(); | + | waveParams[element.id] = setWaveParamsFunction(); |
}) | }) | ||
} | } |
Latest revision as of 18:42, 20 October 2020
/* Prerequisites:
* Have an animWave div with an svg with a animWavePath path inside* (
<svg width="100%" height="100%" version="1.1" xmlns="http://www.w3.org/2000/svg"><path id="animWavePath" d="" fill="#fafafc"/></svg>
)
* call the makeWave function with element and function which returns waveParams object (width, height, waveWidth, waveHeight, waveDelta, speed, wavePoints) */
//var wave; var waveParams = {};
function initializeWaveAnimation(el) {
el.style.backgroundImage = "unset"; var wave = el.querySelector('.animWavePath');
let myWaveParams = waveParams[el.id];
function calculateWavePoints(factor) { myWaveParams = waveParams[el.id]; let points = [];
for (let i = 0, n = myWaveParams.wavePoints; i <= n; i++) { let x = i / n * myWaveParams.waveWidth; let sinSeed = (factor + (i + i % n)) * myWaveParams.speed * 100; let sinHeight = Math.sin(sinSeed / 100) * myWaveParams.waveDelta; let yPos = Math.sin(sinSeed / 100) * sinHeight + myWaveParams.waveHeight; points.push({ x: x, y: yPos }); }
return points; }
function buildPath(points) { let SVGString = "M " + points[0].x + " " + points[0].y;
let cp0 = { x: (points[1].x - points[0].x) / 2, y: (points[1].y - points[0].y) + points[0].y + (points[1].y - points[0].y) };
SVGString += " C " + cp0.x + " " + cp0.y + " " + cp0.x + " " + cp0.y + " " + points[1].x + " " + points[1].y;
let prevCp = cp0; let inverted = -1;
for (let i = 1; i < points.length - 1; i++) { // let cpLength = Math.sqrt(prevCp.x * prevCp.x + prevCp.y * prevCp.y); let cp1 = { x: (points[i].x - prevCp.x) + points[i].x, y: (points[i].y - prevCp.y) + points[i].y };
SVGString += " C " + cp1.x + " " + cp1.y + " " + cp1.x + " " + cp1.y + " " + points[i + 1].x + " " + points[i + 1].y; prevCp = cp1; inverted = -inverted; };
SVGString += " L " + myWaveParams.width + " " + myWaveParams.height; SVGString += " L 0 " + myWaveParams.height + " Z"; return SVGString; }
let lastUpdate = window.Date.now(); let totalTime = 0;
function tick(timeElapsed) { totalTime += (timeElapsed - lastUpdate) / 1000; lastUpdate = timeElapsed;
let factor = totalTime * Math.PI; wave.setAttribute("d", buildPath(calculateWavePoints(factor)));
window.requestAnimationFrame(tick); }; tick(performance.now());
}
function setWaveParams_default() {
let container = document.body; return { width: container.offsetWidth, height: container.offsetHeight, waveWidth: container.offsetWidth, waveHeight: window.innerHeight, waveDelta: 15, speed: 0.15, wavePoints: 6, };
}
function setRandomParams() {
return { waveDelta: Math.floor(Math.random() * 20) + 10, speed: Math.random() + 0.05, wavePoints: Math.floor(Math.random() * 5) + 2, }
}
function makeWave(element, setWaveParamsFunction = setWaveParams_default){
waveParams[element.id] = setWaveParamsFunction(); initializeWaveAnimation(element); window.addEventListener("resize", () => { waveParams[element.id] = setWaveParamsFunction(); }); window.addEventListener('load', () => { waveParams[element.id] = setWaveParamsFunction(); })
}