/**
* Calculates the inverse of this transform.
*
* @return the inverted transform
*/
public CCTransform invert() {
CCTransform result = new CCTransform();
if (_myIsIdentity) {
result.setIdentity();
return result;
}
result._myMatrix.set(_myMatrix);
if (_myIsRotationMatrix) {
if (_myIsUniformScale) {
final double sx = _myScale.x;
result._myMatrix.transposeLocal();
if (sx != 1.0) {
result._myMatrix.multiplyLocal(1.0f / sx);
}
} else {
result._myMatrix.set(result._myMatrix.multiplyDiagonalPost(_myScale).invertLocal());
}
} else {
result._myMatrix.invertLocal();
}
result._myTranslation.set(result._myMatrix.applyPost(_myTranslation).negateLocal());
result.updateFlags(_myIsRotationMatrix);
return result;
}
/**
* Copies the given transform values into this transform object.
*
* @param source
* @return this transform for chaining.
* @throws NullPointerException if source is null.
*/
public CCTransform set(final CCTransform source) {
if (source.isIdentity()) {
setIdentity();
} else {
_myMatrix.set(source.getMatrix());
_myScale.set(source.scale());
_myTranslation.set(source.translation());
_myIsIdentity = false;
_myIsRotationMatrix = source.isRotationMatrix();
_myIsUniformScale = source.isUniformScale();
}
return this;
}
