voluptasquisquam/src/image/roi/__tests__/angle.js

Image processing and manipulation in JavaScript

import {Image} from 'test/common';
import 'should';

/* Image to test:
0011
1111
1100
0100
 */
describe('Get the angle of the region, relative to the maxlength', function () {
    let data = new Uint8Array(2);
    data[0] = 63;
    data[1] = 196;

    let mask = new Image(4, 4, data, {
        kind: 'BINARY'
    });

    let roiManager = mask.getRoiManager();
    roiManager.fromMask(mask);
    it('angle', function () {
        let result = roiManager.getRois();
        result[0].angle.should.eql(-Math.atan2(0 - 3, 3 - 1) * 180 / Math.PI);
    });
});