@nativescript/core/matrix/index.js

A JavaScript library providing an easy to use api for interacting with iOS and Android platform APIs.

import { radiansToDegrees, degreesToRadians } from '../utils/number-utils';
export const getTransformMatrix = ({ property, value }) => TRANSFORM_MATRIXES[property](value);
const TRANSFORM_MATRIXES = {
    scale: ({ x, y }) => [x, 0, 0, 0, y, 0, 0, 0, 1],
    translate: ({ x, y }) => [1, 0, x, 0, 1, y, 0, 0, 1],
    rotate: ({ x, y, z }) => {
        // TODO: Handle rotations over X and Y axis
        const radZ = degreesToRadians(z);
        const cosZ = Math.cos(radZ);
        const sinZ = Math.sin(radZ);
        return [cosZ, -sinZ, 0, sinZ, cosZ, 0, 0, 0, 1];
    },
};
export const matrixArrayToCssMatrix = (m) => [m[0], m[3], m[1], m[4], m[2], m[5]];
export function multiplyAffine2d(m1, m2) {
    return [m1[0] * m2[0] + m1[1] * m2[3], m1[0] * m2[1] + m1[1] * m2[4], m1[0] * m2[2] + m1[1] * m2[5] + m1[2], m1[3] * m2[0] + m1[4] * m2[3], m1[3] * m2[1] + m1[4] * m2[4], m1[3] * m2[2] + m1[4] * m2[5] + m1[5]];
}
// TODO: Decompose rotations over X and Y axis
export function decompose2DTransformMatrix(matrix) {
    verifyTransformMatrix(matrix);
    const [A, B, C, D, E, F] = [...matrix];
    const determinant = A * D - B * C;
    const translate = { x: E || 0, y: F || 0 };
    // rewrite with obj destructuring using the identity matrix
    let rotate = 0;
    let scale = { x: 1, y: 1 };
    if (A || B) {
        const R = Math.sqrt(A * A + B * B);
        rotate = B > 0 ? Math.acos(A / R) : -Math.acos(A / R);
        scale = { x: R, y: determinant / R };
    }
    else if (C || D) {
        const R = Math.sqrt(C * C + D * D);
        rotate = Math.PI / 2 - (D > 0 ? Math.acos(-C / R) : -Math.acos(C / R));
        scale = { x: determinant / R, y: R };
    }
    rotate = radiansToDegrees(rotate);
    return { translate, rotate: { x: 0, y: 0, z: rotate }, scale };
}
function verifyTransformMatrix(matrix) {
    if (matrix.length < 6) {
        throw new Error('Transform matrix should be 2x3.');
    }
}
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