Added LowPassFilter and support for smooth scatter rotation and zoom.

2019-07-11 15:41:03 +02:00
parent 2a11f02bd2
commit cd76ae22a4
6 changed files with 1602 additions and 1276 deletions
@@ -132,6 +132,27 @@ is compatible with arrays of absolute points.
    context.stroke()

 </script>
+<h2>
+    Low Pass Filter
+</h2>
+<p>
+    Low Pass Filter muffles fast (high-frequency) changes to the signal. 
+    For more information visit the <a href="http://en.wikipedia.org/wiki/Low-pass_filter">wikipedia article</a>.
+</p>
+<script class="doctest">
+    let lpf = new LowPassFilter(0.5)
+    Doctest.expect(lpf.smoothArray([10,8,9,10,12,8,50,10,12,8]), [10,9,9,10,11,9,30,20,16,12])
+
+    Doctest.expect(lpf.next(20), 10.0)
+    Doctest.expect(lpf.next(20), 12.5)
+    Doctest.expect(lpf.next(20), 14.375)
+    Doctest.expect(lpf.next(20), 15.78125)
+
+    lpf = new LowPassFilter(0.2)
+    lpf.setup([10,10,10,10,10,10,10,10,10,10])
+    Doctest.expect(lpf.next(20), 12.0)
+    Doctest.expect(lpf.next(10), 10.32)
+</script>
 <h2>
 	References
 </h2>