Re: Printing onto custom paper (filling in forms)
Re: Printing onto custom paper (filling in forms)
- Subject: Re: Printing onto custom paper (filling in forms)
- From: Ben <email@hidden>
- Date: Thu, 28 Aug 2014 15:56:14 +0100
On 28 Aug 2014, at 15:01, Keary Suska <email@hidden> wrote:
> On Aug 28, 2014, at 7:20 AM, Ben <email@hidden> wrote:
>
>> I'm trying to make a tool for myself to fill in some repetitive forms. They've got a custom paper size with a series of boxes to be filled in.
>>
>> Given that I know the dimensions of the paper and the locations and dimensions of the boxes to fill in, I should be able to draw a view that prints onto these sheets. However, I'm getting lost in the printing system trying to figure out what steps I need to take to get this working.
>>
>> I don't understand how to go from the physical paper size (say 80mm wide, 150mm tall) to the paper size Cocoa wants in points. Is there a method that gives a scaling factor from points to any physical unit?
>>
>> I'll also need to precisely position drawn strings in the view to print, so will presumably need to translate points to physical dimensions when drawing too.
>>
>> Can anyone point me to something that might explain how to proceed here?
>
> As the docs say, sizes are measured in the user coordinate space: https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Transforms/Transforms.html#//apple_ref/doc/uid/TP40003290-CH204-SW5
>
> This guide is important to read as well.
>
I've read that before, but not thought to apply it to print devices.
If I understand correctly, I should basically just work everything out at 72dpi (the assumed user space scale) and let the system sort out the scaling for the printer?
So for my case, assuming 72dpi ≈ 2.8 dots/mm:
The paper being 80mm wide should be set to 224 points wide
To inset a label by 10mm from an edge, I should inset by 28 points?
Am I understanding this right?
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