Posted by Stéphane Ducasse on Jul 07, 2010; 10:11pm
URL: https://forum.world.st/simple-point-function-seems-strange-tp2281587.html

Hi

(10@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

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