voluptasquisquam/src/image/operator/__tests__/paintPoints.js

Image processing and manipulation in JavaScript

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

describe('we check paintPoints', function () {
    it('should yield the painted image', function () {

        let size = 5;
        let data = new Array(size * size * 3);
        for (let i = 0; i < data.length; i++) {
            data[i] = i;
        }
        let image = new Image(size, size, data, {kind: 'RGB'});


        let points = [[1, 1], [3, 2]];
        image.paintPoints(points, {shape: {kind: 'smallCross'}});


        let marked = [
            0, 1, 0, 0, 0,
            1, 1, 1, 1, 0,
            0, 1, 1, 1, 1,
            0, 0, 0, 1, 0,
            0, 0, 0, 0, 0
        ];

        let result = new Array(size * size * 3);
        for (let i = 0; i < result.length; i++) {
            result[i] = i;
        }
        for (let i = 0; i < result.length / 3; i++) {
            if (marked[i] === 1) {
                result[i * 3] = 255;
                result[i * 3 + 1] = 0;
                result[i * 3 + 2] = 0;
            }
        }

        Array.from(image.data).should.eql(result);
    });
});