Re: Rotation problem

• Subject: Re: Rotation problem
• From: "Shawn Erickson" <email@hidden>
• Date: Fri, 10 Nov 2006 15:03:49 -0800
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On 11/10/06, Linea Tessile srl <email@hidden> wrote:

               aff = [NSAffineTransform transform];
               [aff translateXBy:-(center.x) yBy:-(center.y)];
               aff1 = [NSAffineTransform transform];
               [aff1 rotateByDegrees:-grado];
               [aff appendTransform:aff1];
               aff2 = [NSAffineTransform transform];
               [aff2 translateXBy: center.x yBy: center.y];
               [aff appendTransform:aff2];

Don't have an answer to your issue (hard to understand what you are
finding incorrect...) but I wanted to note that the above code it more
difficult then it needs to be. The code could be as simple as the
following:

NSAffineTransform* aff = [NSAffineTransform transform];
[aff translateXBy:-(center.x) yBy:-(center.y)];
[aff rotateByDegrees:-grado];
[aff translateXBy:center.x yBy:center.y];

Additionally the following code seem strange to me...

   int xVal,yVal;
   float x,y;

    x = PX2MM(((punto->x) - centerX));
    y = PX2MM(((punto->y) - centerY));

    NSString *xs = [NSString stringWithFormat:@"%.f", x];
    NSString *ys = [NSString stringWithFormat:@"%.f", y];

    xVal = [xs intValue];
    yVal = [ys intValue];

You can assign a float variable to an integer variable directly, no
need to use an NSString instance in between as you appear to be doing.

xVal = x;
yVal = y;

If you want a particular rounding behavior consider using rintf(),
roundf(), ceilf(), floorf(). You can find more information on those by
using "man rintf", etc. in the Terminal.

I cannot follow what exactly you are attempting to do but I believe
you should be able to transform the whole bezier path instead of
having to do each point (consider -[NSBezierPath
transformUsingAffineTransform:]. Or possibly avoid the use of bezier
path by using -[NSAffineTransform transformPoint:].

-Shawn
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