On Nov 29, 2008, at 10:57 AM, Richard Somers wrote:
I just discovered part of my problem. The pdf image was being scaled
down slightly even though there was plenty of room for it inside the
NSButton. The default scaling is "Proportionally Down". Change this
to "None" and the image now is always sharp, at least for a User
Interface Resolution of 1.0.
Change the User Interface Resolution to 1.25 or 1.5 and the pdf
image is ok but not great. This is apparently because "A shape is
scan-converted by painting any pixel whose square region intersects
the shape, no matter how small the intersection is." according to
the "Scan Conversion Rules" in the pdf standard. I think this is why
it looks less sharp at these resolutions. Note that fonts get
special treatment and will render more "precisely" because they are
hinted.
Anyway, perhaps this is why the final image used for many Apple
widgets are bitmapped tiff files and not vector pdf. You can tweak
each and every pixel in a tiff file if you want to. For me I just
wanted to make single vector image and be done with it.
YMMV, but over 99% of my apps images are all vector-based PDF. They
scale beautifully at any scaling factor between 0.5 and 3.0 (to
include the non-integral ones).
Artwork is anything from very simple to very complex (to include
vectorized versions of original artwork from Poser).
I created a class to manage drawing of such images. When drawing, you
must "normalize" the destination rect such that it will always fall on
integral boundaries:
+ (void)makeIntegralRectForScaling_II:(NSRect*)aRect
{
if (scalingFactor_II != 1.0)
{
aRect->origin.x *= scalingFactor_II;
aRect->origin.y *= scalingFactor_II;
aRect->size.width *= scalingFactor_II;
aRect->size.height *= scalingFactor_II;
*aRect = NSIntegralRect (*aRect);
aRect->origin.x /= scalingFactor_II;
aRect->origin.y /= scalingFactor_II;
aRect->size.width /= scalingFactor_II;
aRect->size.height /= scalingFactor_II;
}
}
___________________________________________________________
Ricky A. Sharp mailto:[EMAIL PROTECTED]
Instant Interactive(tm) http://www.instantinteractive.com
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