Joe, thank you. That page helps. I succeeded, but I had to set the width to
0.01 because if I set it to zero I get a 2 pixels thick line when the scale
is different than 1.0. Don't know why. Please follow me.
After scaling the view with
scale = 1.33;
[self setBoundsSize:NSMakeSize((int)([self frame].size.width / scale),
(int)([self frame].size.height / scale))];
I get these logs in the drawRect method
scale 1.33
frame {{0, 0}, {1166, 1253}},
bounds {{-140, -50}, {875, 941}}
As you can see the frame and bounds values are all integers now.
Now I draw a vertical line
[NSBezierPath setDefaultLineWidth:0.0];
bot = NSMakePoint(0.5, 0.5);
top = NSMakePoint(0.5, 9.5);
[NSBezierPath strokeLineFromPoint:bot toPoint:top];
And the lines looks 2 pixels thick. Dam! So I tried to set
[NSBezierPath setDefaultLineWidth:0.01 / scale];
And it worked at any scale. Can't guess why! With 0.001 I don't see any
line. Strange story, it works with zero, with 0.01/1.33 and it doesn't work
with 0.001 / 1.33. Any idea?
Best Regards
--
Lorenzo
email: [EMAIL PROTECTED]
> From: Joe Goh <[EMAIL PROTECTED]>
> Date: Fri, 25 Apr 2008 17:31:17 +0800
> To: cocoa-dev@lists.apple.com, Lorenzo <[EMAIL PROTECTED]>
> Subject: Re: One pixel width. One.
>
> On 4/25/08, Lorenzo <[EMAIL PROTECTED]> wrote:
>> I am trying to draw a line with 1 pixel width. No matter whether the view is
>> scaled or scrolled, I want to see a 1 pixel thick line.
>
> I highly, highly recommend reading this article:
> http://wincent.com/a/about/wincent/weblog/archives/2007/01/offbyone.php
>
> I wanted to do the exact same thing in my app last year and this
> article saved the day for me.
>
> HTH,
> Joe Goh
> FunkeeMonk Technology
> http://www.funkeemonk.com/
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