[orx-camera] Add ParametricOrbital

orx-camera/src/commonMain/kotlin/ParametricOrbital.kt

@@ -0,0 +1,77 @@
+package org.openrndr.extra.camera
+
+import org.openrndr.Extension
+import org.openrndr.Program
+import org.openrndr.draw.Drawer
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+import org.openrndr.extra.parameters.Vector3Parameter
+import org.openrndr.math.Spherical
+import org.openrndr.math.Vector3
+
+/**
+ * Extension that provides orbital camera through annotated parameters
+ */
+@Description("Orbital camera")
+class ParametricOrbital : Extension {
+    override var enabled: Boolean = true
+
+    @DoubleParameter("fov", 1.0, 90.0, order = 0)
+    var fov = 45.0
+        set(value) {
+            field = value
+            camera.zoomTo(fov)
+        }
+
+    val camera by lazy {
+        OrbitalCamera(Spherical(theta, phi, radius).cartesian, center, fov, 0.1, 1000.0, projectionType).apply {
+            dampingFactor = 0.0
+        }
+    }
+
+    @DoubleParameter("phi", 0.0, 180.0, order = 2)
+    var phi = 0.0
+        set(value) {
+            field = value
+            camera.rotateTo(theta, phi.coerceAtLeast(1E-3))
+        }
+
+    @DoubleParameter("theta", -180.0, 180.0, order = 1)
+    var theta = 0.0
+        set(value) {
+            field = value
+            camera.rotateTo(theta, phi.coerceAtLeast(1E-3))
+        }
+
+
+    @DoubleParameter("orbit radius", 0.1, 100.0, order = 3)
+    var radius = 10.0
+        set(value) {
+            field = value
+            camera.dollyTo(radius)
+        }
+
+
+    @Vector3Parameter("center", order = 4)
+    var center = Vector3.ZERO
+        set(value) {
+            field = value
+            camera.panTo(value)
+        }
+
+
+    var projectionType = ProjectionType.PERSPECTIVE
+
+
+    override fun setup(program: Program) {
+
+    }
+
+    override fun beforeDraw(drawer: Drawer, program: Program) {
+        camera.beforeDraw(drawer, program)
+    }
+
+    override fun afterDraw(drawer: Drawer, program: Program) {
+        camera.afterDraw(drawer, program)
+    }
+}