@Override
public Transformation getParentToLocalTransformation() {
if (this.mParentToLocalTransformation == null) {
this.mParentToLocalTransformation = new Transformation();
}
final Transformation parentToLocalTransformation = this.mParentToLocalTransformation;
if (this.mParentToLocalTransformationDirty) {
parentToLocalTransformation.setToIdentity();
/* Offset. */
parentToLocalTransformation.postTranslate(this.mLocalOffsetCenterX, this.mLocalOffsetCenterY);
/* Translation. */
parentToLocalTransformation.postTranslate(-this.mX, -this.mY);
/* Rotation. */
final float rotation = this.mRotation;
if (rotation != 0) {
final float localRotationCenterX = this.mLocalRotationCenterX;
final float localRotationCenterY = this.mLocalRotationCenterY;
parentToLocalTransformation.postTranslate(-localRotationCenterX, -localRotationCenterY);
parentToLocalTransformation.postRotate(rotation);
parentToLocalTransformation.postTranslate(localRotationCenterX, localRotationCenterY);
}
/* Skew. */
final float skewX = this.mSkewX;
final float skewY = this.mSkewY;
if ((skewX != 0) || (skewY != 0)) {
final float localSkewCenterX = this.mLocalSkewCenterX;
final float localSkewCenterY = this.mLocalSkewCenterY;
parentToLocalTransformation.postTranslate(-localSkewCenterX, -localSkewCenterY);
parentToLocalTransformation.postSkew(-skewX, -skewY);
parentToLocalTransformation.postTranslate(localSkewCenterX, localSkewCenterY);
}
/* Scale. */
final float scaleX = this.mScaleX;
final float scaleY = this.mScaleY;
if ((scaleX != 1) || (scaleY != 1)) {
final float localScaleCenterX = this.mLocalScaleCenterX;
final float localScaleCenterY = this.mLocalScaleCenterY;
parentToLocalTransformation.postTranslate(-localScaleCenterX, -localScaleCenterY);
parentToLocalTransformation.postScale(
1 / scaleX,
1
/ scaleY); // TODO Division could be replaced by a multiplication of
// 'scale(X/Y)Inverse'...
parentToLocalTransformation.postTranslate(localScaleCenterX, localScaleCenterY);
}
this.mParentToLocalTransformationDirty = false;
}
return parentToLocalTransformation;
}
@Override
public Transformation getLocalToParentTransformation() {
if (this.mLocalToParentTransformation == null) {
this.mLocalToParentTransformation = new Transformation();
}
final Transformation localToParentTransformation = this.mLocalToParentTransformation;
if (this.mLocalToParentTransformationDirty) {
localToParentTransformation.setToIdentity();
/* Scale. */
final float scaleX = this.mScaleX;
final float scaleY = this.mScaleY;
if ((scaleX != 1) || (scaleY != 1)) {
final float scaleCenterX = this.mLocalScaleCenterX;
final float scaleCenterY = this.mLocalScaleCenterY;
/* TODO Check if it is worth to check for scaleCenterX == 0 && scaleCenterY == 0 as the two postTranslate can be saved.
* The same obviously applies for all similar occurrences of this pattern in this class. */
localToParentTransformation.postTranslate(-scaleCenterX, -scaleCenterY);
localToParentTransformation.postScale(scaleX, scaleY);
localToParentTransformation.postTranslate(scaleCenterX, scaleCenterY);
}
/* Skew. */
final float skewX = this.mSkewX;
final float skewY = this.mSkewY;
if ((skewX != 0) || (skewY != 0)) {
final float skewCenterX = this.mLocalSkewCenterX;
final float skewCenterY = this.mLocalSkewCenterY;
localToParentTransformation.postTranslate(-skewCenterX, -skewCenterY);
localToParentTransformation.postSkew(skewX, skewY);
localToParentTransformation.postTranslate(skewCenterX, skewCenterY);
}
/* Rotation. */
final float rotation = this.mRotation;
if (rotation != 0) {
final float rotationCenterX = this.mLocalRotationCenterX;
final float rotationCenterY = this.mLocalRotationCenterY;
localToParentTransformation.postTranslate(-rotationCenterX, -rotationCenterY);
localToParentTransformation.postRotate(-rotation);
localToParentTransformation.postTranslate(rotationCenterX, rotationCenterY);
}
/* Translation. */
localToParentTransformation.postTranslate(this.mX, this.mY);
/* Offset. */
localToParentTransformation.postTranslate(
-this.mLocalOffsetCenterX, -this.mLocalOffsetCenterY);
this.mLocalToParentTransformationDirty = false;
}
return localToParentTransformation;
}