[orx-camera-2d] Add Camera2DManual

orx-camera/src/jvmDemo/kotlin/DemoCamera2DManual01.kt

@@ -0,0 +1,46 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.isolatedWithTarget
+import org.openrndr.draw.loadFont
+import org.openrndr.draw.renderTarget
+import org.openrndr.extra.camera.Camera2D
+import org.openrndr.extra.camera.Camera2DManual
+import org.openrndr.math.Vector2
+import org.openrndr.math.transforms.transform
+import org.openrndr.shape.Rectangle
+import kotlin.math.sin
+
+/**
+ * Demonstrate the use of `Camera2DManual` for manual camera control.
+ *
+ * The application is configured with a 720x720 window size. Within the program, a custom camera (`Camera2DManual`)
+ * is initialized and used to create isolated drawing scopes. The `isolated` method is utilized to overlay different
+ * drawing operations while maintaining individual camera states, ensuring proper transformations for specific elements.
+ *
+ * A pink circle is drawn at the center of the canvas with varying radii using isolated and non-isolated camera states.
+ * The outermost and innermost circles are affected by the `Camera2DManual` isolated scope, while the middle circle
+ * is outside of the camera's isolated scope, creating a layered visual effect.
+ */
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+
+    program {
+        val camera = Camera2DManual()
+        extend {
+            camera.isolated {
+                drawer.fill = ColorRGBa.PINK
+                drawer.circle(drawer.bounds.center, 300.0)
+            }
+
+            drawer.circle(drawer.bounds.center, 200.0)
+
+            camera.isolated {
+                drawer.fill = ColorRGBa.PINK
+                drawer.circle(drawer.bounds.center, 100.0)
+            }
+        }
+    }
+}