v1.4.2-stable

fix a rotate bug.

v1.4.1-stable

add pinned & circle translate support.

v1.4.0-stable

1. code refactoring, extracting non-core functions.
2. add rotate support.

v1.3.0-stable

enhance base constraints.

v1.2.0-stable

add arbitrary position support.

v1.1.1-stable

add pinned translate support.

v1.1.0-stable

fix pinned rotate bug.

v1.1.0-beta

fully support pinned position.

v1.1.0-alpha

add pinned position support.

v1.0.7-stable

optimize key set.