25 lines
1.0 KiB
JavaScript
25 lines
1.0 KiB
JavaScript
import { getRandom } from "tsparticles-engine";
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export class CircleShape {
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randomPosition(position, size, fill) {
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const generateTheta = (x, y) => {
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const u = getRandom() / 4.0, theta = Math.atan((y / x) * Math.tan(2 * Math.PI * u)), v = getRandom();
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if (v < 0.25) {
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return theta;
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}
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else if (v < 0.5) {
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return Math.PI - theta;
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}
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else if (v < 0.75) {
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return Math.PI + theta;
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}
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else {
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return -theta;
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}
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}, radius = (x, y, theta) => (x * y) / Math.sqrt((y * Math.cos(theta)) ** 2 + (x * Math.sin(theta)) ** 2), [a, b] = [size.width / 2, size.height / 2], randomTheta = generateTheta(a, b), maxRadius = radius(a, b, randomTheta), randomRadius = fill ? maxRadius * Math.sqrt(getRandom()) : maxRadius;
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return {
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x: position.x + randomRadius * Math.cos(randomTheta),
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y: position.y + randomRadius * Math.sin(randomTheta),
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};
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}
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}
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