import {i18n} from '../utils/i18n';
import {getStats} from './stats';
// doc imports
/* eslint-disable no-unused-vars */
import {Point2D} from '../math/point';
import {ViewController} from '../app/viewController';
import {Scalar2D} from './scalar';
/* eslint-enable no-unused-vars */
/**
* Mulitply the three inputs if the last two are not null.
*
* @param {number} a The first input.
* @param {number} b The second input.
* @param {number} c The third input.
* @returns {number} The multiplication of the three inputs or
* null if one of the last two is null.
*/
function mulABC(a, b, c) {
let res = null;
if (b !== null && c !== null) {
res = a * b * c;
}
return res;
}
/**
* Circle shape.
*/
export class Circle {
/**
* Circle centre.
*
* @type {Point2D}
*/
#centre;
/**
* Circle radius.
*
* @type {number}
*/
#radius;
/**
* @param {Point2D} centre A Point2D representing the centre
* of the circle.
* @param {number} radius The radius of the circle.
*/
constructor(centre, radius) {
this.#centre = centre;
this.#radius = radius;
}
/**
* Get the centre (point) of the circle.
*
* @returns {Point2D} The center (point) of the circle.
*/
getCenter() {
return this.#centre;
}
/**
* Get the radius of the circle.
*
* @returns {number} The radius of the circle.
*/
getRadius() {
return this.#radius;
}
/**
* Check for equality.
*
* @param {Circle} rhs The object to compare to.
* @returns {boolean} True if both objects are equal.
*/
equals(rhs) {
return rhs !== null &&
this.getCenter().equals(rhs.getCenter()) &&
this.getRadius() === rhs.getRadius();
}
/**
* Get the surface of the circle.
*
* @returns {number} The surface of the circle.
*/
getSurface() {
return Math.PI * this.getRadius() * this.getRadius();
}
/**
* Get the surface of the circle according to a spacing.
*
* @param {Scalar2D} spacing2D The 2D spacing.
* @returns {number} The surface of the circle multiplied by the given
* spacing or null for null spacings.
*/
getWorldSurface(spacing2D) {
return mulABC(this.getSurface(), spacing2D.x, spacing2D.y);
}
/**
* Get the rounded limits of the circle.
*
* See: {@link https://en.wikipedia.org/wiki/Circle#Equations}.
*
* Circle formula: `x*x + y*y = r*r`.
*
* Implies: `y = (+-) sqrt(r*r - x*x)`.
*
* @returns {number[][][]} The rounded limits:
* list of [x, y] pairs (min, max).
*/
getRound() {
const centerX = this.getCenter().getX();
const centerY = this.getCenter().getY();
const radius = this.getRadius();
const rSquare = Math.pow(radius, 2);
// Y bounds
const minY = centerY - radius;
const maxY = centerY + radius;
const regions = [];
// loop through lines and store limits
for (let y = minY; y < maxY; ++y) {
const diff = rSquare - Math.pow(y - centerY, 2);
// remove small values (possibly negative)
if (Math.abs(diff) < 1e-7) {
continue;
}
const transX = Math.sqrt(diff);
// remove small values
if (transX < 0.5) {
continue;
}
regions.push([
[Math.round(centerX - transX), Math.round(y)],
[Math.round(centerX + transX), Math.round(y)]
]);
}
return regions;
}
/**
* Quantify an circle according to view information.
*
* @param {ViewController} viewController The associated view controller.
* @param {string[]} flags A list of stat values to calculate.
* @returns {object} A quantification object.
*/
quantify(viewController, flags) {
const quant = {};
// shape quantification
const spacing2D = viewController.get2DSpacing();
quant.radius = {
value: this.getRadius() * spacing2D.x,
unit: i18n.t('unit.mm')
};
const surface = this.getWorldSurface(spacing2D);
if (surface !== null) {
quant.surface = {value: surface / 100, unit: i18n.t('unit.cm2')};
}
// pixel values quantification
if (viewController.canQuantifyImage()) {
const regions = this.getRound();
if (regions.length !== 0) {
const values = viewController.getImageVariableRegionValues(regions);
const unit = viewController.getPixelUnit();
const quantif = getStats(values, flags);
quant.min = {value: quantif.min, unit: unit};
quant.max = {value: quantif.max, unit: unit};
quant.mean = {value: quantif.mean, unit: unit};
quant.stdDev = {value: quantif.stdDev, unit: unit};
if (typeof quantif.median !== 'undefined') {
quant.median = {value: quantif.median, unit: unit};
}
if (typeof quantif.p25 !== 'undefined') {
quant.p25 = {value: quantif.p25, unit: unit};
}
if (typeof quantif.p75 !== 'undefined') {
quant.p75 = {value: quantif.p75, unit: unit};
}
}
}
// return
return quant;
}
} // Circle class