introduce array_fps

Author: vbarbarosh

src/array_fps.js

@@ -0,0 +1,21 @@
+const round = require('./round');
+
+const EPS = 0.00001;
+
+function array_fps(duration_sec, fps)
+{
+    const total_frames = Math.floor(duration_sec * fps);
+
+    if (total_frames <= 1) {
+        return [0];
+    }
+
+    const out = [];
+    for (let i = 0; i < total_frames; ++i) {
+        // console.log((i / (total_frames - 1)) * (duration_sec - EPS), round((i / (total_frames - 1)) * (duration_sec - EPS), EPS));
+        out.push(round((i / (total_frames - 1)) * (duration_sec - EPS), EPS));
+    }
+    return out;
+}
+
+module.exports = array_fps;

src/array_fps.test.js

@@ -0,0 +1,11 @@
+const array_fps = require('./array_fps');
+const assert = require('assert');
+
+describe('array_fps', function () {
+    it('should handle basic input', function () {
+        assert.deepStrictEqual(array_fps(1, 1), [0]);
+        assert.deepStrictEqual(array_fps(1, 2), [0, 0.99999]);
+        assert.deepStrictEqual(array_fps(1, 3), [0, 0.49999, 0.99999]);
+        assert.deepStrictEqual(array_fps(1, 4), [0, 0.33333, 0.66666, 0.99999]);
+    });
+});