Tween.js
When we want to change values (location, rotation, speed) over the course of time in this book, we use the Tween library. The project home page is http://github.com/sole/tween.js.
Building a Tween involves several parts. A Tween needs the starting value or values, the ending values, the time that it takes to move from the start to the end values, and a function that’s called as the Tween is running. A Tween also needs to be started and updated to work.
The Tween from Chapter 11, Project: Fruit Hunt, contains a good example.
| | new TWEEN. |
| | Tween({ |
| | height: 150, |
| | spin: 0 |
| | }). |
| | to({ |
| | height: 250, |
| | spin: 4 |
| | }, 500). |
| | onUpdate(function () { |
| | fruit.position.y = this.height; |
| | fruit.rotation.z = this.spin; |
| | }). |
| | start(); |
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