Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | 2x 2x 2x 2x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 105x 105x 105x 105x 105x 44x 44x 44x 44x 44x 44x | // Adapted from https://github.com/mourner/kdbush
// ISC License
// Copyright (c) 2018, Vladimir Agafonkin
// Permission to use, copy, modify, and/or distribute this software for any purpose
// with or without fee is hereby granted, provided that the above copyright notice
// and this permission notice appear in all copies.
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
// OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
// THIS SOFTWARE.
const ARRAY_TYPES = [
Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array,
Int32Array, Uint32Array, Float32Array, Float64Array
];
const VERSION = 1;
const HEADER_SIZE = 8;
export class KDBush {
private data: ArrayBuffer;
public ids: Uint16Array | Uint32Array;
public coords: InstanceType<TypedArrayConstructor>;
private _pos: number;
private _finished: boolean;
private numItems: number;
public nodeSize: number;
private ArrayType: TypedArrayConstructor;
private IndexArrayType: typeof Uint16Array | typeof Uint32Array;
constructor(
numItems: number,
nodeSize: number = 64,
ArrayType: TypedArrayConstructor = Float64Array,
data?: ArrayBuffer
) {
Iif (isNaN(numItems) || numItems < 0) {
throw new Error(`Unexpected numItems value: ${numItems}.`);
}
this.numItems = numItems;
this.nodeSize = Math.min(Math.max(nodeSize, 2), 65535);
this.ArrayType = ArrayType;
this.IndexArrayType = numItems < 65536 ? Uint16Array : Uint32Array;
const arrayTypeIndex = ARRAY_TYPES.indexOf(this.ArrayType);
const coordsByteSize = numItems * 2 * this.ArrayType.BYTES_PER_ELEMENT;
const idsByteSize = numItems * this.IndexArrayType.BYTES_PER_ELEMENT;
const padCoords = (8 - idsByteSize % 8) % 8;
Iif (arrayTypeIndex < 0) {
throw new Error(`Unexpected typed array class: ${ArrayType}.`);
}
Iif (data) {
this.data = data;
this.ids = new (this.IndexArrayType as any)(this.data, HEADER_SIZE, numItems);
this.coords = new (this.ArrayType as any)(this.data, HEADER_SIZE + idsByteSize + padCoords, numItems * 2);
this._pos = numItems * 2;
this._finished = true;
} else {
this.data = new ArrayBuffer(HEADER_SIZE + coordsByteSize + idsByteSize + padCoords);
this.ids = new (this.IndexArrayType as any)(this.data, HEADER_SIZE, numItems);
this.coords = new (this.ArrayType as any)(this.data, HEADER_SIZE + idsByteSize + padCoords, numItems * 2);
this._pos = 0;
this._finished = false;
new Uint8Array(this.data, 0, 2).set([0xdb, (VERSION << 4) + arrayTypeIndex]);
new Uint16Array(this.data, 2, 1)[0] = this.nodeSize;
new Uint32Array(this.data, 4, 1)[0] = this.numItems;
}
}
add(x: number, y: number): number {
const index = this._pos >> 1;
this.ids[index] = index;
this.coords[this._pos++] = x;
this.coords[this._pos++] = y;
return index;
}
finish(): this {
const numAdded = this._pos >> 1;
Iif (numAdded !== this.numItems) {
throw new Error(`Added ${numAdded} items when expected ${this.numItems}.`);
}
sort(this.ids, this.coords, this.nodeSize, 0, this.numItems - 1, 0);
this._finished = true;
return this;
}
}
type TypedArrayConstructor =
Int8ArrayConstructor | Uint8ArrayConstructor | Uint8ClampedArrayConstructor |
Int16ArrayConstructor | Uint16ArrayConstructor |
Int32ArrayConstructor | Uint32ArrayConstructor |
Float32ArrayConstructor | Float64ArrayConstructor;
function sort(
ids: Uint16Array | Uint32Array,
coords: InstanceType<TypedArrayConstructor>,
nodeSize: number,
left: number,
right: number,
axis: number
): void {
if (right - left <= nodeSize) return;
const m = (left + right) >> 1;
select(ids, coords, m, left, right, axis);
sort(ids, coords, nodeSize, left, m - 1, 1 - axis);
sort(ids, coords, nodeSize, m + 1, right, 1 - axis);
}
function select(
ids: Uint16Array | Uint32Array,
coords: InstanceType<TypedArrayConstructor>,
k: number,
left: number,
right: number,
axis: number
): void {
while (right > left) {
Iif (right - left > 600) {
const n = right - left + 1;
const m = k - left + 1;
const z = Math.log(n);
const s = 0.5 * Math.exp(2 * z / 3);
const sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
const newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
const newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
select(ids, coords, k, newLeft, newRight, axis);
}
const t = coords[2 * k + axis];
let i = left;
let j = right;
swapItem(ids, coords, left, k);
Iif (coords[2 * right + axis] > t) {
swapItem(ids, coords, left, right);
}
while (i < j) {
swapItem(ids, coords, i, j);
i++;
j--;
while (coords[2 * i + axis] < t) i++;
while (coords[2 * j + axis] > t) j--;
}
if (coords[2 * left + axis] === t) {
swapItem(ids, coords, left, j);
} else {
j++;
swapItem(ids, coords, j, right);
}
Iif (j <= k) left = j + 1;
Iif (k <= j) right = j - 1;
}
}
function swapItem(
ids: Uint16Array | Uint32Array,
coords: InstanceType<TypedArrayConstructor>,
i: number,
j: number
): void {
swap(ids, i, j);
swap(coords, 2 * i, 2 * j);
swap(coords, 2 * i + 1, 2 * j + 1);
}
function swap<T extends Uint16Array | Uint32Array | Float32Array | Float64Array | Int8Array | Int16Array | Int32Array | Uint8Array | Uint8ClampedArray>(
arr: T,
i: number,
j: number
): void {
const tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
|