/*
|
* Copyright 2012 ZXing authors
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
/*namespace com.google.zxing.common.detector {*/
|
/**
|
* General math-related and numeric utility functions.
|
*/
|
export default class MathUtils {
|
constructor() { }
|
/**
|
* Ends up being a bit faster than {@link Math#round(float)}. This merely rounds its
|
* argument to the nearest int, where x.5 rounds up to x+1. Semantics of this shortcut
|
* differ slightly from {@link Math#round(float)} in that half rounds down for negative
|
* values. -2.5 rounds to -3, not -2. For purposes here it makes no difference.
|
*
|
* @param d real value to round
|
* @return nearest {@code int}
|
*/
|
static round(d /*float*/) {
|
if (isNaN(d))
|
return 0;
|
if (d <= Number.MIN_SAFE_INTEGER)
|
return Number.MIN_SAFE_INTEGER;
|
if (d >= Number.MAX_SAFE_INTEGER)
|
return Number.MAX_SAFE_INTEGER;
|
return /*(int) */ (d + (d < 0.0 ? -0.5 : 0.5)) | 0;
|
}
|
// TYPESCRIPTPORT: maybe remove round method and call directly Math.round, it looks like it doesn't make sense for js
|
/**
|
* @param aX point A x coordinate
|
* @param aY point A y coordinate
|
* @param bX point B x coordinate
|
* @param bY point B y coordinate
|
* @return Euclidean distance between points A and B
|
*/
|
static distance(aX /*float|int*/, aY /*float|int*/, bX /*float|int*/, bY /*float|int*/) {
|
const xDiff = aX - bX;
|
const yDiff = aY - bY;
|
return /*(float) */ Math.sqrt(xDiff * xDiff + yDiff * yDiff);
|
}
|
/**
|
* @param aX point A x coordinate
|
* @param aY point A y coordinate
|
* @param bX point B x coordinate
|
* @param bY point B y coordinate
|
* @return Euclidean distance between points A and B
|
*/
|
// public static distance(aX: number /*int*/, aY: number /*int*/, bX: number /*int*/, bY: number /*int*/): float {
|
// const xDiff = aX - bX
|
// const yDiff = aY - bY
|
// return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff);
|
// }
|
/**
|
* @param array values to sum
|
* @return sum of values in array
|
*/
|
static sum(array) {
|
let count = 0;
|
for (let i = 0, length = array.length; i !== length; i++) {
|
const a = array[i];
|
count += a;
|
}
|
return count;
|
}
|
}
|
