TweenAccessor

Introduction

The TweenAccessor interface lets you interpolate any attribute from any object. Just implement it as you want and register it to the engine.

• See the TweenAccessor.java source code

Here is the content of this interface (without the javadoc):

public interface TweenAccessor<T> {
    public int getValues(T target, int tweenType, float[] returnValues);
    public void setValues(T target, int tweenType, float[] newValues);
}

How to implement that

1. In the getValues() method, you need to modify the "returnValues" float array that is given in parameters with values corresponding to the given tweenType. For instance, if tweenType corresponds to a rotation, you need to return the current value or your object rotation:

public int getValues(Sprite target, int tweenType, float[] returnValues) {
    switch (tweenType) {
        case ROTATION:
            returnValues[0] = target.getRotation();
            return 1;
    }
}

Note that you have to return the amount of modified array cells (in the case of rotation, there is only 1 modification).

2. In the setValues() method, you need to update your object attributes with the given values:

public void setValues(Sprite target, int tweenType, float[] newValues) {
    switch (tweenType) {
        case ROTATION:
            target.setRotation(newValues[0]);
            break;
    }
}

Example

For a complete implementation example, please refer to the GetStarted page.