fixed gui stuff

src/main/kotlin/Main.kt

@@ -7,6 +7,7 @@ import filter.EchoFilter
 import filter.Limiter
 import gui.SimpleEx
 import random.RandomDisplacementFractal
+import java.awt.event.WindowAdapter
 import javax.swing.JSlider
 import kotlin.math.cos
 import kotlin.math.pow
@@ -93,8 +94,10 @@ fun main(args: Array<String>) {
 
     frame.add_slider("Property 1", 0, 100, 50).addChangeListener { e ->
         val value = (e.source as JSlider).value
+        println(value)
 
     }
 
+    frame.isVisible = true
 }