[orx-shapes] Demo comments

orx-shapes/src/jvmDemo/kotlin/bezierpatch/DemoBezierPatchDrawer04.kt

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+package bezierpatch
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.noise.uniform
+import org.openrndr.extra.shapes.adjust.adjustContour
+import org.openrndr.extra.shapes.bezierpatches.bezierPatch
+import org.openrndr.math.Vector3
+import kotlin.random.Random
+
+/**
+ * Demonstrates how to create and render a bezier patch with randomized control points
+ * and colors. The bezier patch is derived from a scaled-down copy of the
+ * drawer bounds, converted to a contour and deformed using `adjustContour`.
+ *
+ * The bezier patch uses 16 randomly generated colors chunked into 4 lists with 4 colors each.
+ *
+ */
+fun main() = application {
+    program {
+        val r = Random(1213)
+        val bp = bezierPatch(
+            adjustContour(drawer.bounds.offsetEdges(-50.0).contour) {
+                vertices.forEach {
+                    it.rotate(Double.uniform(10.0, 30.0, r))
+                }
+            }
+        ).withColors(
+            List(16) {
+                ColorRGBa.fromVector(Vector3.uniform(0.0, 1.0, r))
+            }.chunked(4)
+        )
+
+        extend {
+            drawer.clear(ColorRGBa.PINK)
+
+            // Render the colored patch
+            drawer.bezierPatch(bp)
+
+            // Render horizontal and vertical lines in the patch
+            drawer.stroke = ColorRGBa.BLACK.opacify(0.3)
+            for (i in 0 until 20) {
+                drawer.contour(bp.horizontal(i / 19.0))
+            }
+            for (i in 0 until 10) {
+                drawer.contour(bp.vertical(i / 9.0))
+            }
+
+            // Render the contour of the patch
+            drawer.fill = null
+            drawer.stroke = ColorRGBa.WHITE
+            drawer.strokeWeight = 3.0
+            drawer.contour(bp.contour)
+        }
+    }
+}