Align to spline [constraint]

Align to spline constraints gives you easily the possibility to align a Transitionable object along a spline.

First, you have to instantiate a Spline.

Spline someSplinePath = new SplineBezier();

someSplinePath.addPoint(new Vector3f(0.0f, 1.0f, 0.0f));
someSplinePath.addPoint(new Vector3f(10.0f, 10.0f, 0.0f));
someSplinePath.addPoint(new Vector3f(20.0f, 0.0f, 0.0f));

Now get your scenery object (com.nolimitsframework.scenery.SceneryObject and com.nolimitsframework.animation.Animation)

SceneryObject Cube = new SceneryObject("Cube");

Every class (for example SceneryObject) which inherits com.nolimitsframework.transition.Transition provides the attachConstraint(Constraint) method.

Create an align to spline constraint (com.nolimitsframework.constraints.AlignToSpline). The constructor AlignToSpline(Spline, Tangential) description:

• Spline: This might be self explaining.
• Tangential: Align tangential along the spline

So just call

AlignToSpline alignToSomeSplinePath = new AlignToSpline(someSplinePath, true);

Now you can call

Cube.attachConstraint(alignToSomeSplinePath);

Now your Cube is aligned to the someSplinePath. The interesting part is, you can animate your cube to run along the spline. If you didn´t read the article about animations, just visit the basics of animations.

Animation AlignToSplineAnimation = Animation.createFromObject(alignToSomeSplinePath);
AlignToSplineAnimation.addAnimation(AlignToSpline.PROPERTY_POSITION_ABSOLUTE_POSITION, 10.0f, 0.0f, 5.0f, Easing.ELASTIC_IN_OUT);

This will give you an animation for your spline to move along the spline until the 10th meter is reached in 5 seconds.