[orx-shade-styles] Add composed gradient and clip shading demo example

orx-shade-styles/src/jvmDemo/kotlin/composed/DemoComposed01.kt

@@ -0,0 +1,59 @@
+package composed
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.shadestyles.fills.clip.clip
+import org.openrndr.extra.shadestyles.fills.gradients.gradient
+
+/**
+ * The main entry point of the application that sets up the visual program.
+ *
+ * This method creates a graphical program with a 720x720 window and uses a rotating
+ * gradient-shaded rectangle as the primary visual element. It demonstrates the use
+ * of gradient shading and clipping through a compositional approach.
+ *
+ * The method performs the following actions:
+ * 1. Configures the application window size.
+ * 2. Constructs a conic gradient with a rotation of 54 degrees and full circular coverage.
+ * 3. Creates a star-shaped clip with configurable sharpness, radius, and number of sides.
+ * 4. Combines the gradient and clip into a composite shading style.
+ * 5. Defines a program loop where the rectangle with the gradient and clip combination
+ *    rotates around the center of the canvas while being redrawn continuously.
+ */
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val g = gradient<ColorRGBa> {
+            stops[0.0] = ColorRGBa.BLACK
+            stops[1.0] = ColorRGBa.WHITE
+            conic {
+                rotation = 54.0
+                angle = 360.0
+            }
+        }
+
+        val c = clip {
+            clipInner = -0.1
+            clipOuter = 0.095
+            star {
+                sides = 5
+                radius = 0.4
+                sharpness = 0.74
+            }
+        }
+
+        // compose the clip and gradient shade styles into one
+        val comp = c + g
+
+        extend {
+            drawer.translate(width / 2.0, height / 2.0)
+            drawer.rotate(seconds * 10.0)
+            drawer.translate(-width / 2.0, -height / 2.0)
+            drawer.shadeStyle = comp
+            drawer.rectangle(drawer.bounds)
+        }
+    }
+}