webglimpse
Version:
Webglimpse is a data visualization library for the web.
107 lines • 12.6 kB
JavaScript
/*
* Copyright (c) 2014, Metron, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// XXX: These probably belong in their own namespace
export function indexOf(vs, x) {
let a = 0;
let b = vs.length - 1;
while (a <= b) {
// Bitwise-or-zero truncates to integer
// tslint:disable-next-line:no-bitwise
const pivot = ((a + b) / 2) | 0;
const vPivot = vs[pivot];
if (vPivot < x) {
a = pivot + 1;
}
else if (vPivot > x) {
b = pivot - 1;
}
else {
// This is a little sloppy if either value is NaN, or if one is +0.0 and the other is -0.0
return pivot;
}
}
return -(a + 1);
}
export function indexNearest(vs, x) {
const i = indexOf(vs, x);
// Exact value found
if (i >= 0) {
return i;
}
// Find the closer of the adjacent values
const iAfter = -i - 1;
const iBefore = iAfter - 1;
if (iAfter >= vs.length) {
return iBefore;
}
if (iBefore < 0) {
return iAfter;
}
const diffAfter = vs[iAfter] - x;
const diffBefore = x - vs[iBefore];
return (diffAfter <= diffBefore ? iAfter : iBefore);
}
export function indexAfter(vs, x) {
const i = indexOf(vs, x);
// Exact value not found
if (i < 0) {
return (-i - 1);
}
// If the exact value was found, find the value's last occurrence
const n = vs.length;
for (let j = i + 1; j < n; j++) {
if (vs[j] > x) {
return j;
}
}
return n;
}
export function indexAtOrAfter(vs, x) {
const i = indexOf(vs, x);
// Exact value not found
if (i < 0) {
return (-i - 1);
}
// If the exact value was found, find the value's first occurrence
const n = vs.length;
for (let j = i; j > 0; j--) {
if (vs[j - 1] < x) {
return j;
}
}
return 0;
}
export function indexBefore(vs, x) {
return indexAtOrAfter(vs, x) - 1;
}
export function indexAtOrBefore(vs, x) {
return indexAfter(vs, x) - 1;
}
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Redistributions of source code must retain the above copyright notice, this\r\n *    list of conditions and the following disclaimer.\r\n *\r\n * 2. Redistributions in binary form must reproduce the above copyright notice,\r\n *    this list of conditions and the following disclaimer in the documentation\r\n *    and/or other materials provided with the distribution.\r\n *\r\n * 3. Neither the name of the copyright holder nor the names of its contributors\r\n *    may be used to endorse or promote products derived from this software without\r\n *    specific prior written permission.\r\n *\r\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\r\n * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r\n * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR\r\n * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r\n * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON\r\n * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\r\n * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r\n */\r\n\r\n\r\n// XXX: These probably belong in their own namespace\r\n\r\n\r\nexport function indexOf(vs: number[], x: number): number {\r\n    let a = 0;\r\n    let b = vs.length - 1;\r\n\r\n    while (a <= b) {\r\n        // Bitwise-or-zero truncates to integer\r\n        // tslint:disable-next-line:no-bitwise\r\n        const pivot = ((a + b) / 2) | 0;\r\n        const vPivot = vs[pivot];\r\n\r\n        if (vPivot < x) {\r\n            a = pivot + 1;\r\n        }\r\n        else if (vPivot > x) {\r\n            b = pivot - 1;\r\n        }\r\n        else {\r\n            // This is a little sloppy if either value is NaN, or if one is +0.0 and the other is -0.0\r\n            return pivot;\r\n        }\r\n    }\r\n\r\n    return -(a + 1);\r\n}\r\n\r\n\r\n\r\nexport function indexNearest(vs: number[], x: number): number {\r\n    const i = indexOf(vs, x);\r\n\r\n    // Exact value found\r\n    if (i >= 0) {\r\n        return i;\r\n    }\r\n\r\n    // Find the closer of the adjacent values\r\n    const iAfter = -i - 1;\r\n    const iBefore = iAfter - 1;\r\n\r\n    if (iAfter >= vs.length) {\r\n        return iBefore;\r\n    }\r\n    if (iBefore < 0) {\r\n        return iAfter;\r\n    }\r\n\r\n    const diffAfter = vs[iAfter] - x;\r\n    const diffBefore = x - vs[iBefore];\r\n\r\n    return (diffAfter <= diffBefore ? iAfter : iBefore);\r\n}\r\n\r\n\r\n\r\nexport function indexAfter(vs: number[], x: number): number {\r\n    const i = indexOf(vs, x);\r\n\r\n    // Exact value not found\r\n    if (i < 0) {\r\n        return (-i - 1);\r\n    }\r\n\r\n    // If the exact value was found, find the value's last occurrence\r\n    const n = vs.length;\r\n    for (let j = i + 1; j < n; j++) {\r\n        if (vs[j] > x) {\r\n            return j;\r\n        }\r\n    }\r\n    return n;\r\n}\r\n\r\n\r\n\r\nexport function indexAtOrAfter(vs: number[], x: number): number {\r\n    const i = indexOf(vs, x);\r\n\r\n    // Exact value not found\r\n    if (i < 0) {\r\n        return (-i - 1);\r\n    }\r\n\r\n    // If the exact value was found, find the value's first occurrence\r\n    const n = vs.length;\r\n    for (let j = i; j > 0; j--) {\r\n        if (vs[j - 1] < x) {\r\n            return j;\r\n        }\r\n    }\r\n    return 0;\r\n}\r\n\r\n\r\n\r\nexport function indexBefore(vs: number[], x: number): number {\r\n    return indexAtOrAfter(vs, x) - 1;\r\n}\r\n\r\n\r\n\r\nexport function indexAtOrBefore(vs: number[], x: number): number {\r\n    return indexAfter(vs, x) - 1;\r\n}\r\n\r\n\r\n"]}