image-js/lib/align/affineTransfrom/createAffineTransformModel.js

Image processing and manipulation in JavaScript

/**
 * Generate a function that applies the given transformation parameters to a point.
 * The transform is an array of number in the format: [angle, x, y, scale].
 * @param transform - Transformation to apply.
 * @returns Function to transform a point.
 */
export function createAffineTransformModel(transform) {
    if (transform.length !== 4) {
        throw new Error('Transform had wrong number of parameters');
    }
    return (point) => {
        const angle = (transform[0] * Math.PI) / 180;
        const xTranslation = transform[1];
        const yTranslation = transform[2];
        const scale = transform[3];
        const column = scale * (Math.cos(angle) * point.column - Math.sin(angle) * point.row) +
            xTranslation;
        const row = scale * (Math.sin(angle) * point.column + Math.cos(angle) * point.row) +
            yTranslation;
        return { column, row };
    };
}
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