Update app.py

app.py

@@ -356,9 +356,9 @@ with gr.Blocks(css=css) as demo:
                 if (document.getElementById(\"pl\").getAttribute(\"points\").length < 256) {
                   var pts = \"\";
                   for (var i=0; i<256; i++) {
-                    pts += i+\",\"+Math.sin(i/256*Math.PI/2)*127+\" \";
+                    pts += i+\",\"+parseInt(Math.sin(i/256*Math.PI/2)*127)+\" \";
                   }
-                  document.getElementById(\"pl\").setAttribute(\"points\", pts); 
+                  document.getElementById(\"pl\").setAttribute(\"points\", pts.slice(0,-1)); 
                   this.onpointermove = function(event) {
                     if (this.style.borderBottom == \"1px dotted white\") {
                       var x = parseInt(event.clientX - event.target.getBoundingClientRect().x);