image-js/lib/filters/hypotenuse.js

Image processing and manipulation in JavaScript

import { getOutputImage } from '../utils/getOutputImage.js';
import checkProcessable from '../utils/validators/checkProcessable.js';
import { validateChannels } from '../utils/validators/validators.js';
/**
 * Calculate a new image that is the hypotenuse between the current image and the otherImage.
 * @param image - First image to process.
 * @param otherImage - Second image.
 * @param options - Hypotenuse options.
 * @returns Hypotenuse of the two images.
 */
export function hypotenuse(image, otherImage, options = {}) {
    const { channels = new Array(image.components).fill(0).map((value, index) => index), } = options;
    checkProcessable(image, {
        bitDepth: [8, 16],
    });
    if (image.width !== otherImage.width || image.height !== otherImage.height) {
        throw new RangeError('both images must have the same size');
    }
    if (image.alpha !== otherImage.alpha ||
        image.bitDepth !== otherImage.bitDepth) {
        throw new RangeError('both images must have the same alpha and bitDepth');
    }
    if (image.channels !== otherImage.channels) {
        throw new RangeError('both images must have the same number of channels');
    }
    validateChannels(channels, image);
    const newImage = getOutputImage(image, {}, { clone: true });
    for (const channel of channels) {
        for (let i = 0; i < image.size; i++) {
            const value = Math.hypot(image.getValueByIndex(i, channel), otherImage.getValueByIndex(i, channel));
            newImage.setValueByIndex(i, channel, Math.min(value, newImage.maxValue));
        }
    }
    return newImage;
}
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