[orx-shapes] Refactor package layout

orx-shapes/src/jvmDemo/kotlin/primitives/DemoRectangleGrid02.kt

@@ -0,0 +1,39 @@
+package primitives
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.noise.Random
+import org.openrndr.extra.shapes.primitives.grid
+
+fun main() {
+    application {
+        // Try changing the resolution. The design will use the available space.
+        configure {
+            width = 800
+            height = 400
+        }
+        program {
+            // By specifying the cell size we make sure the design will
+            // contain squares, independently of the window size and its
+            // aspect ratio.
+            val grid = drawer.bounds.grid(50.0, 50.0,
+                20.0, 20.0, 20.0, 20.0).flatten()
+
+            val grid2 = grid.map { rect ->
+                // Each of these inner grids will occupy the available space
+                // in the parent grid cells. Notice how we don't specify cell
+                // sizes here but counts instead (between 1 and 3 columns and
+                // rows)
+                val count = Random.int(1, 4)
+                rect.grid(count, count, 5.0, 5.0, 5.0, 5.0).flatten()
+            }.flatten().filter { Random.bool(0.5)}
+
+            extend {
+                drawer.clear(ColorRGBa.PINK)
+                drawer.rectangles(grid)
+                drawer.fill = ColorRGBa.BLACK
+                drawer.rectangles(grid2)
+            }
+        }
+    }
+}