Fix: prevent drawing points if all are filtered out (#209)

Author: flekschas

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 1.12.1
 
+- Fix: prevent drawing points if all are filtered out ([#201](https://github.com/flekschas/regl-scatterplot/issues/201))
 - Fix: destroy the encoding texture before recreating it
 - Fix: reject `set()` calls if the instance was destroyed
 - Fix: ensures unnecessary color and encoding texture updates are avoided

src/index.js

@@ -2270,7 +2270,7 @@ const createScatterplot = (
     const filteredSelectedPoints = [];
 
     for (const pointIdx of pointIdxsArray) {
-      if (pointIdx < 0 || pointIdx >= numPoints) {
+      if (!Number.isFinite(pointIdx) || pointIdx < 0 || pointIdx >= numPoints) {
         // Skip invalid filtered points
         continue;
       }
@@ -4322,7 +4322,8 @@ const createScatterplot = (
         });
       }
 
-      if (isPointsDrawn) {
+      const numPoints = getNormalNumPoints();
+      if (isPointsDrawn && numPoints > 0) {
         drawPointBodies();
       }