I was stupid to think that the rotation did not depend on the origin and
coordinate system.
Stef
On Jul 8, 2010, at 12:28 AM, Henrik Sperre Johansen wrote:
> On 08.07.2010 00:26, Henrik Sperre Johansen wrote:
>> On 08.07.2010 00:11, Stéphane Ducasse wrote:
>>> Hi
>>>
>>> (1...@20) rotateBy: #left centerAt: 0 @0
>>> returns
>>> 20@ -10
>>>
>>> and my math tells me that this is a rotation to the right.
>>>
>>> Am I correct?
>>> Then why I'm wrong? screen coordinates vs. math coordinate?
>>>
>>> Stef
>> You rotate around the center, left is compared to the center -> point
>> vector, not the other way around.
yes but
>>
>> Cheers,
>> Henry
> ... assuming you use screen coordinates of course, starting at top left :)
>
>
>
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