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import QtQuick
import QtQuick.Shapes
Item {
id: root
property color fillColor: "transparent"
property int lobes: 12
property real lobeAmount: 0.070
property real roundness: 0.22
property real hillPower: 0.78
property real paddingFrac: 0.020
property real inset: 0
property int segments: 120
property real rotationDeg: -90
layer.enabled: true
layer.samples: 4
function sgn(v) {
return v < 0 ? -1 : 1;
}
function clamp(v, a, b) {
return Math.max(a, Math.min(b, v));
}
function squircleMap(u, v, p) {
const ax = sgn(u) * Math.pow(Math.abs(u), p);
const ay = sgn(v) * Math.pow(Math.abs(v), p);
return {
x: ax,
y: ay
};
}
function buildPathD(w, h) {
const x0 = inset, y0 = inset;
const x1 = w - inset, y1 = h - inset;
const iw = Math.max(2, x1 - x0);
const ih = Math.max(2, y1 - y0);
const cx = x0 + iw * 0.5;
const cy = y0 + ih * 0.5;
const rx = iw * 0.5;
const ry = ih * 0.5;
const rMin = Math.min(rx, ry);
const amp = clamp(lobeAmount, 0.0, 0.14) * rMin;
const extraPad = paddingFrac * rMin + 1.5;
const pad = amp + extraPad;
const rxBase = Math.max(2, rx - pad);
const ryBase = Math.max(2, ry - pad);
const blend = clamp(roundness, 0.0, 0.45);
const squirclePow = 1.0 + blend * 2.8;
const N = Math.max(48, segments);
const rot = rotationDeg * Math.PI / 180.0;
const dt = (Math.PI * 2.0) / N;
function hillWave(a) {
const t = (Math.cos(lobes * a) + 1.0) * 0.5;
return Math.pow(t, hillPower);
}
function P(t) {
const a = t + rot;
const u = Math.cos(a);
const v = Math.sin(a);
const m = 1.0 + (amp / rMin) * hillWave(a);
const ex = u * rxBase * m;
const ey = v * ryBase * m;
const sm = squircleMap(u, v, 1.0 / squirclePow);
const sx = sm.x * rxBase * m;
const sy = sm.y * ryBase * m;
const x = ex * (1.0 - blend) + sx * blend;
const y = ey * (1.0 - blend) + sy * blend;
return {
x: cx + x,
y: cy + y
};
}
function dP(t) {
const eps = dt * 0.25;
const p1 = P(t - eps);
const p2 = P(t + eps);
return {
x: (p2.x - p1.x) / (2 * eps),
y: (p2.y - p1.y) / (2 * eps)
};
}
const p0 = P(0.0);
let d = `M ${p0.x.toFixed(2)} ${p0.y.toFixed(2)} `;
for (let i = 0; i < N; i++) {
const tA = i * dt;
const tB = (i + 1) * dt;
const A = P(tA);
const B = P(tB);
const dA = dP(tA);
const dB = dP(tB);
const c1x = A.x + (dt / 3.0) * dA.x;
const c1y = A.y + (dt / 3.0) * dA.y;
const c2x = B.x - (dt / 3.0) * dB.x;
const c2y = B.y - (dt / 3.0) * dB.y;
d += `C ${c1x.toFixed(2)} ${c1y.toFixed(2)}, ${c2x.toFixed(2)} ${c2y.toFixed(2)}, ${B.x.toFixed(2)} ${B.y.toFixed(2)} `;
}
d += "Z";
return d;
}
Shape {
anchors.fill: parent
ShapePath {
fillColor: root.fillColor
strokeColor: "transparent"
PathSvg {
path: root.buildPathD(root.width, root.height)
}
}
}
}
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