OK. A follow up question, then: How do I match the scale the the
NSRulerView is using? I DO want to make sure that my 1" matches what the
ruler shows is 1".
> From: John Stiles <email@hidden>
> Date: Fri, 07 Jan 2005 11:52:48 -0800
> To: Mark Dawson <email@hidden>
> Cc: email@hidden
> Subject: Re: Drawing scaled lines
> There is no way to figure out the actual physical size of a monitor
> programatically. And every monitor is going to be a little bit
> Apple's current flat-panel lineup is all *about* 100dpi, but each model
> is slightly off. I don't remember the exact numbers.
> Third-party monitorsparticularly CRTswill vary wildly and of course
> it will also depend on resolution chosen by the end user.
> I would let the user configure this. Render a line on the screen, ask
> them to measure it and tell you how long it is, and then you can work
> backwards to figure out the exact DPI of the screen. I'd default to 100
> until otherwise configured, so you'll be "pretty close" on an Apple
> flat-panel right out of the box.
> On Jan 7, 2005, at 11:41 AM, Mark Dawson wrote:
>> I want to draw line figures (lines, rects, etc) that are correctly
>> scaled (i.e., 1" on screen is 1' in real life). I haven't quite
>> figured out the question to ask to find the correct documentation
>> I've found that NSSize is the basic size, which contains floats. From
>> what I can tell, they are in "point" units. Do I just use the 72.0
>> points/inch constant, or is there a system call that I should use?
>> Give than NSize uses floats, what does it mean to have 1.01
>> points--i.e., do fractional points show up?
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