I think I did what the "High Resolution Guidelines for OS X” document suggested
for drawing offscreen vector images. See code snip below.
The result looks the same to me. It’s OK with the old code, and OK with the
new code.
To help me understand what I’m doing, I would appreciate if someone please
elaborate on this quote from the documeent:
“If your app uses -lockFocus: … either you’ll get a low resolution NSImage
object that looks incorrect when drawn, or you’ll get a 2x image that has more
pixels in its bitmap than you are expecting”
• Are these “either” the only two possible results, or is there a third
possibility, that it will work properly?
• Regarding "a low resolution NSImage object that looks incorrect when drawn”,
does that mean that it looks grossly incorrect, like, say, the image is scaled
down and squashed into one quadrant, or does it just mean that it will look
fuzzy on a Retina display?
• What does "a 2x image that has more pixels in its bitmap” mean? I thought
that a 2x image is expected to have more pixels in its bitmap.
Jerry
…
NSImage* image ;
if ([NSImage
respondsToSelector:@selector(imageWithSize:flipped:drawingHandler:)]) {
// OS X 10.8 or later
image = [NSImage imageWithSize:size
flipped:NO
drawingHandler:^(NSRect dstRect) {
[self drawStyle:style
length:length
color:color] ;
return YES ;
}] ;
}
else {
image = [[NSImage alloc] initWithSize:size] ;
[image lockFocus] ;
[self drawStyle:style
length:length
color:color] ;
[image unlockFocus] ;
}
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