Improve the logic about calculate vertices (#3746)
Reason:
* Do similar things in similar way :  compute left / top , then add width/height .
* A very very very very (...* 1000000) bit little performance improvement :  one `-` & one `*` become one `+`.
* fix some words in document.
1 parent a80c379 commit f84420173fa46a41df237a081871cc2e35fe0ce4
@finscn finscn authored on 17 Feb 2017
Mat Groves committed on 17 Feb 2017
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src/core/sprites/Sprite.js