@wolsok/thanos
Version:
Wolf Soko's implementation of a cool Thanos snapping vaporizing effect for destroying dom elements
194 lines • 29.6 kB
JavaScript
class SimplexNoise {
constructor(options) {
const { min, max, random, amplitude, frequency, octaves, persistence } = createOptionsWithDefaults(options);
this.random = random;
this.amplitude = amplitude;
this.frequency = frequency;
this.octaves = octaves;
this.persistence = persistence;
this.scale = min === -1 && max === 1 ? (value) => value : (value) => min + ((value + 1) / 2) * (max - min);
const p = new Uint8Array(256);
for (let i = 0; i < 256; i++) {
p[i] = i;
}
let n;
let q;
for (let i = 255; i > 0; i--) {
n = Math.floor((i + 1) * this.random());
q = p[i];
p[i] = p[n];
p[n] = q;
}
this.perm = new Uint8Array(512);
this.permMod12 = new Uint8Array(512);
for (let i = 0; i < 512; i++) {
this.perm[i] = p[i & 255];
this.permMod12[i] = this.perm[i] % 12;
}
}
static G3 = 1.0 / 6.0;
static GRAD3D = [
[1, 1, 0],
[-1, 1, 0],
[1, -1, 0],
[-1, -1, 0],
[1, 0, 1],
[-1, 0, 1],
[1, 0, -1],
[-1, 0, -1],
[0, 1, 1],
[0, -1, -1],
[0, 1, -1],
[0, -1, -1],
];
amplitude;
frequency;
octaves;
perm;
permMod12;
persistence;
random;
scale;
memScale3D = {};
dot(gs, coords) {
return gs.slice(0, Math.min(gs.length, coords.length)).reduce((total, g, i) => total + g * coords[i], 0);
}
raw3D(x, y, z) {
// Skew the input space to determine which simplex cell we're in
const s = (x + y + z) / 3.0; // Very nice and simple skew factor for 3D
const i = Math.floor(x + s);
const j = Math.floor(y + s);
const k = Math.floor(z + s);
const t = (i + j + k) * SimplexNoise.G3;
const X0 = i - t; // Unskew the cell origin back to (x,y,z) space
const Y0 = j - t;
const Z0 = k - t;
const x0 = x - X0; // The x,y,z distances from the cell origin
const y0 = y - Y0;
const z0 = z - Z0;
// Determine which simplex we are in
let i1, j1, k1; // Offsets for second corner of simplex in (i,j,k) coords
let i2, j2, k2; // Offsets for third corner of simplex in (i,j,k) coords
if (x0 >= y0) {
if (y0 >= z0) {
i1 = i2 = j2 = 1;
j1 = k1 = k2 = 0;
}
else if (x0 >= z0) {
i1 = i2 = k2 = 1;
j1 = k1 = j2 = 0;
}
else {
k1 = i2 = k2 = 1;
i1 = j1 = j2 = 0;
}
}
else {
if (y0 < z0) {
k1 = j2 = k2 = 1;
i1 = j1 = i2 = 0;
}
else if (x0 < z0) {
j1 = j2 = k2 = 1;
i1 = k1 = i2 = 0;
}
else {
j1 = i2 = j2 = 1;
i1 = k1 = k2 = 0;
}
}
const x1 = x0 - i1 + SimplexNoise.G3; // Offsets for second corner in (x,y,z) coords
const y1 = y0 - j1 + SimplexNoise.G3;
const z1 = z0 - k1 + SimplexNoise.G3;
const x2 = x0 - i2 + 2.0 * SimplexNoise.G3; // Offsets for third corner in (x,y,z) coords
const y2 = y0 - j2 + 2.0 * SimplexNoise.G3;
const z2 = z0 - k2 + 2.0 * SimplexNoise.G3;
const x3 = x0 - 1.0 + 3.0 * SimplexNoise.G3; // Offsets for last corner in (x,y,z) coords
const y3 = y0 - 1.0 + 3.0 * SimplexNoise.G3;
const z3 = z0 - 1.0 + 3.0 * SimplexNoise.G3;
// Work out the hashed gradient indices of the four simplex corners
const ii = i & 255;
const jj = j & 255;
const kk = k & 255;
const gi0 = this.permMod12[ii + this.perm[jj + this.perm[kk]]];
const gi1 = this.permMod12[ii + i1 + this.perm[jj + j1 + this.perm[kk + k1]]];
const gi2 = this.permMod12[ii + i2 + this.perm[jj + j2 + this.perm[kk + k2]]];
const gi3 = this.permMod12[ii + 1 + this.perm[jj + 1 + this.perm[kk + 1]]];
// Calculate the contribution from the four corners
const t0 = 0.5 - x0 * x0 - y0 * y0 - z0 * z0;
const n0 = t0 < 0 ? 0.0 : Math.pow(t0, 4) * this.dot(SimplexNoise.GRAD3D[gi0], [x0, y0, z0]);
const t1 = 0.5 - x1 * x1 - y1 * y1 - z1 * z1;
const n1 = t1 < 0 ? 0.0 : Math.pow(t1, 4) * this.dot(SimplexNoise.GRAD3D[gi1], [x1, y1, z1]);
const t2 = 0.5 - x2 * x2 - y2 * y2 - z2 * z2;
const n2 = t2 < 0 ? 0.0 : Math.pow(t2, 4) * this.dot(SimplexNoise.GRAD3D[gi2], [x2, y2, z2]);
const t3 = 0.5 - x3 * x3 - y3 * y3 - z3 * z3;
const n3 = t3 < 0 ? 0.0 : Math.pow(t3, 4) * this.dot(SimplexNoise.GRAD3D[gi3], [x3, y3, z3]);
// Add contributions from each corner to get the final noise value.
// The result is scaled to stay just inside [-1,1]
return 94.68493150681972 * (n0 + n1 + n2 + n3);
}
scaled3D(x, y, z, resolution) {
const memIndex = `${Math.round(x * resolution)}${Math.round(y * resolution)}${Math.round(z * resolution)}`;
const memElem = this.memScale3D[memIndex];
if (memElem != null) {
return memElem;
}
let amplitude = this.amplitude;
let frequency = this.frequency;
let maxAmplitude = 0;
let noise = 0;
for (let i = 0; i < this.octaves; i++) {
noise += this.raw3D(x * frequency, y * frequency, z * frequency) * amplitude;
maxAmplitude += amplitude;
amplitude *= this.persistence;
frequency *= 2;
}
const result = this.scale(noise / maxAmplitude);
this.memScale3D[memIndex] = result;
return result;
}
}
export { SimplexNoise };
function createOptionsWithDefaults(options) {
if (options != null) {
if (options['amplitude'] && typeof options.amplitude !== 'number') {
throw new Error('options.amplitude must be a number');
}
if (options['frequency'] && typeof options.frequency !== 'number') {
throw new Error('options.frequency must be a number');
}
if (options['octaves'] &&
(typeof options.octaves !== 'number' ||
!isFinite(options.octaves) ||
Math.floor(options.octaves) !== options.octaves)) {
throw new Error('options.octaves must be an integer');
}
if (options['persistence'] && typeof options.persistence !== 'number') {
throw new Error('options.persistence must be a number');
}
if (options['random'] && typeof options.random !== 'function') {
throw new Error('options.random must be a function');
}
if (options['min'] && typeof options.min !== 'number') {
throw new Error('options.min must be a number');
}
if (options['max'] && typeof options.max !== 'number') {
throw new Error('options.max must be a number');
}
}
const optionsResult = {
amplitude: 1.0,
frequency: 1.0,
max: 1.0,
min: -1.0,
octaves: 1,
persistence: 0.5,
random: Math.random,
...options,
};
if (optionsResult.min > optionsResult.max) {
throw new Error('min must be smaller max');
}
return optionsResult;
}
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type { SimplexNoiseOptions } from './simplex-noise-options';\n\nexport class SimplexNoise {\n  constructor(options?: Partial<SimplexNoiseOptions>) {\n    const { min, max, random, amplitude, frequency, octaves, persistence } = createOptionsWithDefaults(options);\n\n    this.random = random;\n    this.amplitude = amplitude;\n    this.frequency = frequency;\n    this.octaves = octaves;\n    this.persistence = persistence;\n\n    this.scale = min === -1 && max === 1 ? (value) => value : (value) => min + ((value + 1) / 2) * (max - min);\n\n    const p = new Uint8Array(256);\n    for (let i = 0; i < 256; i++) {\n      p[i] = i;\n    }\n\n    let n: number;\n    let q: number;\n    for (let i = 255; i > 0; i--) {\n      n = Math.floor((i + 1) * this.random());\n      q = p[i];\n      p[i] = p[n];\n      p[n] = q;\n    }\n\n    this.perm = new Uint8Array(512);\n    this.permMod12 = new Uint8Array(512);\n    for (let i = 0; i < 512; i++) {\n      this.perm[i] = p[i & 255];\n      this.permMod12[i] = this.perm[i] % 12;\n    }\n  }\n\n  static G3 = 1.0 / 6.0;\n\n  static GRAD3D = [\n    [1, 1, 0],\n    [-1, 1, 0],\n    [1, -1, 0],\n    [-1, -1, 0],\n    [1, 0, 1],\n    [-1, 0, 1],\n    [1, 0, -1],\n    [-1, 0, -1],\n    [0, 1, 1],\n    [0, -1, -1],\n    [0, 1, -1],\n    [0, -1, -1],\n  ];\n\n  readonly amplitude: number;\n  readonly frequency: number;\n  readonly octaves: number;\n  readonly perm: Uint8Array;\n  readonly permMod12: Uint8Array;\n  readonly persistence: number;\n  readonly random: () => number;\n  readonly scale: (value: number) => number;\n  private memScale3D: { [key: string]: number } = {};\n\n  dot(gs: number[], coords: number[]): number {\n    return gs.slice(0, Math.min(gs.length, coords.length)).reduce((total, g, i) => total + g * coords[i], 0);\n  }\n\n  raw3D(x: number, y: number, z: number): number {\n    // Skew the input space to determine which simplex cell we're in\n    const s = (x + y + z) / 3.0; // Very nice and simple skew factor for 3D\n    const i = Math.floor(x + s);\n    const j = Math.floor(y + s);\n    const k = Math.floor(z + s);\n    const t = (i + j + k) * SimplexNoise.G3;\n    const X0 = i - t; // Unskew the cell origin back to (x,y,z) space\n    const Y0 = j - t;\n    const Z0 = k - t;\n    const x0 = x - X0; // The x,y,z distances from the cell origin\n    const y0 = y - Y0;\n    const z0 = z - Z0;\n\n    // Determine which simplex we are in\n    let i1: number, j1: number, k1: number; // Offsets for second corner of simplex in (i,j,k) coords\n    let i2: number, j2: number, k2: number; // Offsets for third corner of simplex in (i,j,k) coords\n    if (x0 >= y0) {\n      if (y0 >= z0) {\n        i1 = i2 = j2 = 1;\n        j1 = k1 = k2 = 0;\n      } else if (x0 >= z0) {\n        i1 = i2 = k2 = 1;\n        j1 = k1 = j2 = 0;\n      } else {\n        k1 = i2 = k2 = 1;\n        i1 = j1 = j2 = 0;\n      }\n    } else {\n      if (y0 < z0) {\n        k1 = j2 = k2 = 1;\n        i1 = j1 = i2 = 0;\n      } else if (x0 < z0) {\n        j1 = j2 = k2 = 1;\n        i1 = k1 = i2 = 0;\n      } else {\n        j1 = i2 = j2 = 1;\n        i1 = k1 = k2 = 0;\n      }\n    }\n\n    const x1 = x0 - i1 + SimplexNoise.G3; // Offsets for second corner in (x,y,z) coords\n    const y1 = y0 - j1 + SimplexNoise.G3;\n    const z1 = z0 - k1 + SimplexNoise.G3;\n    const x2 = x0 - i2 + 2.0 * SimplexNoise.G3; // Offsets for third corner in (x,y,z) coords\n    const y2 = y0 - j2 + 2.0 * SimplexNoise.G3;\n    const z2 = z0 - k2 + 2.0 * SimplexNoise.G3;\n    const x3 = x0 - 1.0 + 3.0 * SimplexNoise.G3; // Offsets for last corner in (x,y,z) coords\n    const y3 = y0 - 1.0 + 3.0 * SimplexNoise.G3;\n    const z3 = z0 - 1.0 + 3.0 * SimplexNoise.G3;\n\n    // Work out the hashed gradient indices of the four simplex corners\n    const ii = i & 255;\n    const jj = j & 255;\n    const kk = k & 255;\n    const gi0 = this.permMod12[ii + this.perm[jj + this.perm[kk]]];\n    const gi1 = this.permMod12[ii + i1 + this.perm[jj + j1 + this.perm[kk + k1]]];\n    const gi2 = this.permMod12[ii + i2 + this.perm[jj + j2 + this.perm[kk + k2]]];\n    const gi3 = this.permMod12[ii + 1 + this.perm[jj + 1 + this.perm[kk + 1]]];\n\n    // Calculate the contribution from the four corners\n    const t0 = 0.5 - x0 * x0 - y0 * y0 - z0 * z0;\n    const n0 = t0 < 0 ? 0.0 : Math.pow(t0, 4) * this.dot(SimplexNoise.GRAD3D[gi0], [x0, y0, z0]);\n    const t1 = 0.5 - x1 * x1 - y1 * y1 - z1 * z1;\n    const n1 = t1 < 0 ? 0.0 : Math.pow(t1, 4) * this.dot(SimplexNoise.GRAD3D[gi1], [x1, y1, z1]);\n    const t2 = 0.5 - x2 * x2 - y2 * y2 - z2 * z2;\n    const n2 = t2 < 0 ? 0.0 : Math.pow(t2, 4) * this.dot(SimplexNoise.GRAD3D[gi2], [x2, y2, z2]);\n    const t3 = 0.5 - x3 * x3 - y3 * y3 - z3 * z3;\n    const n3 = t3 < 0 ? 0.0 : Math.pow(t3, 4) * this.dot(SimplexNoise.GRAD3D[gi3], [x3, y3, z3]);\n\n    // Add contributions from each corner to get the final noise value.\n    // The result is scaled to stay just inside [-1,1]\n    return 94.68493150681972 * (n0 + n1 + n2 + n3);\n  }\n\n  scaled3D(x: number, y: number, z: number, resolution: number): number {\n    const memIndex = `${Math.round(x * resolution)}${Math.round(y * resolution)}${Math.round(z * resolution)}`;\n    const memElem = this.memScale3D[memIndex];\n    if (memElem != null) {\n      return memElem;\n    }\n\n    let amplitude = this.amplitude;\n    let frequency = this.frequency;\n    let maxAmplitude = 0;\n    let noise = 0;\n\n    for (let i = 0; i < this.octaves; i++) {\n      noise += this.raw3D(x * frequency, y * frequency, z * frequency) * amplitude;\n      maxAmplitude += amplitude;\n      amplitude *= this.persistence;\n      frequency *= 2;\n    }\n    const result = this.scale(noise / maxAmplitude);\n    this.memScale3D[memIndex] = result;\n    return result;\n  }\n}\n\nfunction createOptionsWithDefaults(options?: Partial<SimplexNoiseOptions>) {\n  if (options != null) {\n    if (options['amplitude'] && typeof options.amplitude !== 'number') {\n      throw new Error('options.amplitude must be a number');\n    }\n\n    if (options['frequency'] && typeof options.frequency !== 'number') {\n      throw new Error('options.frequency must be a number');\n    }\n\n    if (\n      options['octaves'] &&\n      (typeof options.octaves !== 'number' ||\n        !isFinite(options.octaves) ||\n        Math.floor(options.octaves) !== options.octaves)\n    ) {\n      throw new Error('options.octaves must be an integer');\n    }\n\n    if (options['persistence'] && typeof options.persistence !== 'number') {\n      throw new Error('options.persistence must be a number');\n    }\n\n    if (options['random'] && typeof options.random !== 'function') {\n      throw new Error('options.random must be a function');\n    }\n\n    if (options['min'] && typeof options.min !== 'number') {\n      throw new Error('options.min must be a number');\n    }\n\n    if (options['max'] && typeof options.max !== 'number') {\n      throw new Error('options.max must be a number');\n    }\n  }\n\n  const optionsResult = {\n    amplitude: 1.0,\n    frequency: 1.0,\n    max: 1.0,\n    min: -1.0,\n    octaves: 1,\n    persistence: 0.5,\n    random: Math.random,\n    ...options,\n  };\n  if (optionsResult.min > optionsResult.max) {\n    throw new Error('min must be smaller max');\n  }\n  return optionsResult;\n}\n"]}