Add LengthAngle physics param mode

Author: Speykious

inox2d/src/formats/payload.rs

@@ -156,6 +156,7 @@ fn deserialize_simple_physics(obj: JsonObject) -> InoxParseResult<SimplePhysics>
 		},
 		map_mode: match obj.get_str("map_mode")? {
 			"AngleLength" => PhysicsParamMapMode::AngleLength,
+			"LengthAngle" => PhysicsParamMapMode::LengthAngle,
 			"XY" => PhysicsParamMapMode::XY,
 			"YX" => PhysicsParamMapMode::YX,
 			unknown => return Err(InoxParseError::UnknownParamMapMode(unknown.to_owned())),

inox2d/src/node/components.rs

@@ -129,6 +129,7 @@ pub enum PhysicsModel {
 #[derive(Clone)]
 pub enum PhysicsParamMapMode {
 	AngleLength,
+	LengthAngle,
 	XY,
 	YX,
 }

inox2d/src/physics/pendulum.rs

@@ -74,6 +74,10 @@ impl<T: Pendulum> SimplePhysicsCtx for T {
 				let a = f32::atan2(-local_angle.x, local_angle.y) / PI;
 				Vec2::new(a, relative_length)
 			}
+			PhysicsParamMapMode::LengthAngle => {
+				let a = f32::atan2(-local_angle.x, local_angle.y) / PI;
+				Vec2::new(relative_length, a)
+			},
 		};
 
 		param_value * oscale