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-shapes/src/jvmDemo/kotlin/primitives/DemoRectangleGrid01.kt

@@ -4,25 +4,23 @@ import org.openrndr.application
 import org.openrndr.color.ColorRGBa
 import org.openrndr.extra.shapes.primitives.grid
 
-fun main() {
-    application {
-        configure {
-            width = 800
-            height = 800
-        }
-        program {
-            extend {
-                drawer.fill = ColorRGBa.WHITE.opacify(0.25)
-                drawer.stroke = ColorRGBa.PINK
+fun main() = application {
+    configure {
+        width = 800
+        height = 800
+    }
+    program {
+        extend {
+            drawer.fill = ColorRGBa.WHITE.opacify(0.25)
+            drawer.stroke = ColorRGBa.PINK
 
-                // Notice the negative gutter in this grid. It creates an
-                // overlap between the resulting rectangles.
-                val grid = drawer.bounds.grid(8, 4, 20.0, 20.0, -20.0, -20.0)
-                for (cell in grid.flatten()) {
-                    drawer.rectangle(cell)
-                    drawer.lineSegment(cell.position(0.0, 0.0), cell.position(1.0, 1.0))
-                }
+            // Notice the negative gutter in this grid. It creates an
+            // overlap between the resulting rectangles.
+            val grid = drawer.bounds.grid(8, 4, 20.0, 20.0, -20.0, -20.0)
+            for (cell in grid.flatten()) {
+                drawer.rectangle(cell)
+                drawer.lineSegment(cell.position(0.0, 0.0), cell.position(1.0, 1.0))
             }
         }
     }
-}
+}