Demos: ensure all use fun main() = application {

- Adjust some demo window sizes.
- Replace Random.double by Double.uniform
- Tweak some demos so screenshots look more interesting

orx-hash-grid/src/jvmDemo/kotlin/DemoFilter01.kt

@@ -10,21 +10,19 @@ import kotlin.random.Random
  * - Filters the generated points to enforce a minimum distance of 20.0 units between them.
  * - Visualizes the filtered points as circles with a radius of 10.0 units on the canvas.
  */
-fun main() {
-    application {
-        configure {
-            width = 720
-            height = 720
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val r = Random(0)
+        val points = (0 until 10000).map {
+            drawer.bounds.uniform(random = r)
         }
-        program {
-            val r = Random(0)
-            val points = (0 until 10000).map {
-                drawer.bounds.uniform(random = r)
-            }
-            val filteredPoints = points.filter(20.0)
-            extend {
-                drawer.circles(filteredPoints, 10.0)
-            }
+        val filteredPoints = points.filter(20.0)
+        extend {
+            drawer.circles(filteredPoints, 10.0)
         }
     }
-}
+}

orx-hash-grid/src/jvmDemo/kotlin/DemoHashGrid01.kt

@@ -13,32 +13,29 @@ import kotlin.random.Random
  * - Rectangles representing the bounds of the cells in the grid.
  * - Circles representing the generated points.
  */
-fun main() {
-    application {
-        configure {
-            width = 720
-            height = 720
-        }
-        program {
-            val r = Random(0)
-            val hashGrid = HashGrid(72.0)
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val r = Random(0)
+        val hashGrid = HashGrid(72.0)
 
-            extend {
-                for (i in 0 until 100) {
-                    val p = drawer.bounds.uniform(random = r)
-                    if (hashGrid.isFree(p)) {
-                        hashGrid.insert(p)
-                    }
+        extend {
+            for (i in 0 until 100) {
+                val p = drawer.bounds.uniform(random = r)
+                if (hashGrid.isFree(p)) {
+                    hashGrid.insert(p)
                 }
-
-                drawer.fill = null
-                drawer.stroke = ColorRGBa.WHITE
-                drawer.rectangles(hashGrid.cells().map { it.bounds }.toList())
-                drawer.fill = null
-                drawer.stroke = ColorRGBa.PINK
-                drawer.circles(hashGrid.points().map { it.first }.toList(), 36.0)
-
             }
+
+            drawer.fill = null
+            drawer.stroke = ColorRGBa.WHITE
+            drawer.rectangles(hashGrid.cells().map { it.bounds }.toList())
+            drawer.fill = null
+            drawer.stroke = ColorRGBa.PINK
+            drawer.circles(hashGrid.points().map { it.first }.toList(), 36.0)
         }
     }
-}
+}