Re: About Ink drawing with wacom tablet
Re: About Ink drawing with wacom tablet
- Subject: Re: About Ink drawing with wacom tablet
- From: "john chen" <email@hidden>
- Date: Wed, 5 Nov 2008 13:33:50 -0600
Raleigh,
Thanks a lot for your suggestion. I have already tried the easy route, it
works, but people is not happy with that since when the pen is outside the
view, it won't draw on it. It's hard for user to keep the pen inside the
view. That is why I am looking for a better solution.
So it sounds there is no easy solution like an Apple API, I guess I will try
the hard route then.
Thanks,
John
On Wed, Nov 5, 2008 at 11:23 AM, Raleigh Ledet <email@hidden> wrote:
> Hi John,
>
> As a former Wacom OS X Software Engineer, I believe I can be of some
> assistance.
>
> There are 2 routes you can go. Easy and Hard.
>
> Easy:
> Just grab any pertinent tablet info out of the mouseDragged event. You can
> make sure that the mouse event has tablet data via [event subType] ==
> NSTabletPointEventSubtype. The mouse coordinates from a pen on a tablet are
> not integral. That is, they are not aligned to pixels. This provides for
> greater accuracy if needed. It's important to know at this stage so you
> aren't confused by them. Simply gather all the mouse locations from the
> mouseDragged events (converted to your view coordinate space) and connect
> them via a NSBezierPath. Or you can do some fancier drawing.
> Pros: Very easy.
> Cons: You are at the mercy of the tablet to screen mapping. However the
> user maps their tablet to the screen, only the portion of the tablet that
> maps to your view can ve used for a signature. (Note: don't try to put up a
> shield window as the tablet may not be mapped to the entire desktop.)
>
> Hard:
> You can talk directly to the Wacom Tablet driver to open a 'context'. With
> this context, you can get the raw dimensions of the tablet and tell the
> tablet to stop moving the cursor (temporarily). Then you want to listen for
> -tabletPoint: events and can map the absoluteY and absoluteY data to map the
> tablet how you see fit. Gather all of the tabletPoints mapped to your liking
> and connect them NSBezierPath. Or you can do some fancier drawing.
> Pros: The whole tablet can be used for signature capture.
> Cons: Harder. Email Wacom engineering for more support on this.
>
> Quick Notes:
> 1. Once the tablet starts issuing mouse drags, it will continue to issue
> drags at a fairly consistent interval until the mouseUp.
> 2. You can make sure the user is using a Pen on the tablet and not a mouse
> via the TabletProximity event. However, you really want to capture this
> event at the NSApp level and broadcast it out to all concerned objects
> (NSNotification anyone) See my 10.4 sample code (Cocoa Tiger Tablets) on
> Wacom's dev site.
> 3. Be sure to read "Next Generation Tablet Software Implementer's Guide,
> MacOS X" from Wacom's dev site.
> 4. Wacom's dev site: http://www.wacomeng.com/devsupport/mac.html
>
> Regards,
> raleigh
>
> Hi all,
>>
>>
>> I am working on to implement a signature feature in a cocoa application. I
>> have an NSImageView, and the goal is for user to sign their names using
>> wacom tablet and the signature would be drawn on the NSImageView. I was
>> wondering if there is an API (from Ink, or wacom ...) that once user is
>> done
>> drawing on the tablet, I can call the API to get a NSImage, or
>> a NSBezierPath so I can draw directly onto the NSImageView ?
>>
>>
>>
>> I saw there is post on cocoa-dev list,
>> http://www.cocoabuilder.com/archive/message/cocoa/2006/1/26/155365, but I
>> haven't figured out how to do it in my cocoa application.
>>
>>
>> At this point, since I haven't figure out how to get the information from
>> ink, I treated the pen as mouse and checking mouseDown event to draw
>> a NSBezierPath, which doesn't work well when the pen is outside the
>> NSImageView.
>>
>>
>>
>> Thanks , I appreciate any help!
>>
>>
>> John
>>
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