Update app.py

app.py

@@ -363,12 +363,14 @@ with gr.Blocks(css=css) as demo:
                   document.getElementById(\"pl\").setAttribute(\"points\", pts.slice(0,-1)); 
                   var xold = 0;
                   var yold = 0;
+                  var x = 0;
+                  var y = 0;
                   function lerp(y1, y2, mu) { return y1*(1-mu)+y2*mu; }
                   
                   this.onpointermove = function(event) {
                     if (this.title != \"\") {
-                      var x = parseInt(event.clientX - event.target.getBoundingClientRect().x);
-                      var y = parseInt(event.clientY - event.target.getBoundingClientRect().y);
+                      x = parseInt(event.clientX - event.target.getBoundingClientRect().x);
+                      y = parseInt(event.clientY - event.target.getBoundingClientRect().y);
                       if (x < 0) { x = 0; } else if (x > 255) { x = 255; }
                       if (y < 0) { y = 0; } else if (y > 31) { y = 31; }
                       var pl_a = document.getElementById(\"pl\").getAttribute(\"points\").split(\" \");