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Splotchify
//
// Returns a subdivided curve using Hobbs' algorithm. The pertubartion
// parameters are noise functions that return a value between 0 and 1
// * noiseSplit controls the edge subdivision point
// * noiseAngle controls the displacement angle with respect to the edge normal
// * noiseAmplitude controls the displacement vector size. 1 yields a displacement with the same size
// as the edge
//
function hobbsPerturb(
curve,
noiseSplit,
noiseAngle,
noiseAmplitude,
moveVertices = false
) {
let result = new Curve();
let n = curve.length;
let q = curve[curve.length - 1];
for (let i = 0; i < n; i++) {
let p = curve[i];
let q = curve[(i + n - 1) % n];
let e = p.sub(q);
let mid = q.add(e.scale(noiseSplit()));
let displaced = mid.add(
e
.rotate(-Math.PI / 2 + Math.PI * (noiseAngle() - 0.5))
.scale(noiseAmplitude())
);
result.push(q, displaced);
if (moveVertices) {
let r = curve[(i + n - 2) % n];
let qdisplaced = q
.add(p.sub(r))
.rotate(-Math.PI / 2 + Math.PI * (noiseAngle() - 0.5))
.scale(noiseAmplitude() / 2);
result.push(qdisplaced, displaced);
} else {
result.push(q, displaced);
}
}
return result;
}
viewof splitDraws = Inputs.range([1, 10], {
label: "Edge split noise n",
step: 1,
value: 2
})
viewof angleDraws = Inputs.range([1, 10], {
label: "Angle noise n", step:1,
value: 2
})
viewof amplitudeDraws = Inputs.range([1, 10], {
label: "Amplitude noise n", step:1,
value: 1
})
viewof amplitudeScale = Inputs.range([0.01, 2], {
label: "Amplitude scale",
value: 1,
step: 0.01
})
viewof layerPerturb = Inputs.range([0, 10], {
label: "Additional perturbation steps per layer",
step: 1,
value: 3
})
viewof layers = Inputs.range([1, 100], { label: "layers", value: 20, step: 1 })
viewof corePerturb = Inputs.range([1, 10], {
label: "Initial perturbation steps",
step: 1,
value: 3
})
viewof useResample = Inputs.checkbox(["initial", "layers"], {
label: "Perturbations followed by arc length resampling?"
})
viewof alpha = Inputs.range([0.01, 1], {
label: "Transparency",
value: 0.02,
step: 0.01
})
viewof color = ColorInput({ value: "#ff0000", label: "color" })
noiseSplit = d3.randomBates(splitDraws)
noiseAngle = d3.randomBates(angleDraws)
noiseAmplitude = {
const noise = d3.randomBates(amplitudeDraws);
return () => 2 * amplitudeScale * Math.abs(noise() - 0.5);
}
import { Curve, Vec } from "@esperanc/2d-geometry-utils"
import { color as ColorInput } from "@esperanc/color-input"
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