My line numbers view, drawAtPoint: is slow
My line numbers view, drawAtPoint: is slow
- Subject: My line numbers view, drawAtPoint: is slow
- From: Bertrand Mansion <email@hidden>
- Date: Sun, 25 May 2003 23:50:36 +0200
Hi,
I am trying to get my line number view to work as fast as possible and
unfortunately, it's very slow, even when there isn't a lot of lines in it :(
I have made a NSView that holds a NSScrollView subclass for my text and a
NSView subclass for my numbers. This architecture seems to work.
But when I draw the line numbers using drawAtPoint: withAttributes:, it
slows the scrolling incredibly. When I comment drawAtPoint:, the scrolling
scrolls at normal speed.
I have read in the list archives that when the view is flipped, drawAtPoint
is supposed to be faster. I have also read that it could be even faster to
draw in an NSImage and just display the image.
I don't know which solution is better for me, knowing that drawRect: is
called very often and it can be intensive.
Do you have any clues ?
Here is the code with the drawAtPoint that slows things down:
// Line number counting and drawing loop
for (i = 0, lines = 1; i < numberOfGlyphs; lines++) {
r = [self convertRect:[lm lineFragmentRectForGlyphAtIndex:I
effectiveRange:&lineRange]
fromView:[_mainView textView]];
if (NSPointInRect(r.origin, rect)) {
s = [NSString stringWithFormat:@"%d", lines, nil];
reqWidth = [s sizeWithAttributes:attr].width;
p = NSMakePoint((leftMarginWidth - reqWidth), r.origin.y);
[s drawAtPoint:p withAttributes:attr]; // <-- VERY SLOW
}
i = NSMaxRange(lineRange);
}
Thanks in advance,
Bertrand Mansion
Mamasam
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