create iron heart

move into

• https://github.com/kyorohiro/doc_2dgame

• https://www.gitbook.com/book/kyorohiro/doc_2dgame/details

https://github.com/kyorohiro/doc_2dgame/tree/master/demo/ironheart

Start Screen

env

  (-)------------(+) x
(-)
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 (+)
 y

angle

clock
(-90)
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---------------(0)
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(90)

relative

         (0)
          |
          |
(-)-------|----------(+)
        ( ^ )