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'use strict';
/**
* Draws small moving gradient boxes and repeats them.
*
* @function MirrorsScreen
* @implements IScreen
*/
module.exports = function (modulation, width, height, renderer) {
const response = [];
const scale = 2 + Math.round(Math.random() * 4);
const scaledHeight = Math.floor(height / scale);
const scaledWidth = Math.floor(width / scale);
for (let i = 0; i < scaledHeight; ++i) {
const row = [];
for (let j = 0; j < scaledWidth; ++j) {
const red = ((modulation + i) * 255 / height) % 255;
const blue = ((modulation + j) * 255 / width) % 255;
const green = ((modulation + i * j) * 255 / (width * height)) % 255;
const cell = [renderer(red, blue, green), ' '];
row.push(cell.join(''));
}
let rowText = '';
for (let j = 0; j < scale; ++j) {
rowText += row.reverse().join('');
}
for (let j = 1; j < scale; ++j) {
response[j * i] = rowText;
response[(height - 1 - (j * i))] = rowText;
}
}
return response.join('\n');
};
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