public PointValue setTarget(float targetX, float targetY) {
        set(x, y);
        this.diffX = targetX - originX;
        this.diffY = targetY - originY;
        return this;
    }
Set target values that should be reached when data animation finish then call {@link Chart#startDataAnimation()}
hellocharts-library/src/lecho/lib/hellocharts/model/PointValue.java