| GitHub Issue | n/a |
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| Type | Bug |
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| Priority | Medium |
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| Status | Closed |
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| Resolution | Invalid |
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| Resolution Date | 2013-07-29T23:36:47.000+0000 |
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| Affected Version/s | Release 1.8.0 |
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| Fix Version/s | 2013 Sprint 16, 2013 Sprint 16 API |
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| Components | iOS |
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| Labels | 2dmatrix, core, rotate |
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| Reporter | Natalie Huynh |
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| Assignee | Ingo Muschenetz |
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| Created | 2011-07-29T13:17:00.000+0000 |
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| Updated | 2017-03-03T22:46:36.000+0000 |
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Steps to Reproduce:
1. Run the attached .js file
2. Click on the blue square
Actual Result
Nothing happens
Expected Result:
Should rotate the blue object -360 degree and the red object 360 degree
This is due to how rotations are implemented: iOS uses a pure mathematical 2D matrix, Android does not, and stores a rotation as a value as opposed to sin and cos values. A 2D matrix is a 2*3 matrix that can be used on (x,y) points to shear, scale, translate, and rotate an image. The values are stateless, and do not indicate a direction or path, only the final effect. To represent rotation of θ, sin(θ) and cos(θ) values are used. Note that because sin(360° + θ) is the same as sin(θ), and cos(360° + θ) also has no difference, there is no way to mathematically express a full rotation. Marking as invalid due to math.
2D matrices use sin and cos, and thus won't represent full rotations.
Closing as invalid.