[PD] gemmouse and pix_data

[cyrille henry]

hello,

with the "perspec" and "view" message to gemwin, you can adjust everything in order to have the gem coordinate to be exactly what you want. i.e. to coincide with pixel value.

c

jim a écrit :
> Thanks a lot for all your help in sorting out using gemmouse with
> pix_data. It's making a lot more sense to me now. It would be nice if
> translateXYZ had a feature like gemmouse where one could set the scale
> relative to the gem window. Same goes for the geometric primitive sizes
> like square. It would be nice to be able to specify those in pixels.
> Thanks again.
> Jim
> 
> 
> On Fri, 2010-04-09 at 14:47 +0200, Jack wrote:
>> Le vendredi 09 avril 2010 à 11:52 +0100, Andrew Faraday a écrit :
>>>
>>>> Date: Fri, 9 Apr 2010 11:03:28 +0200
>>>> From: zmoelnig at iem.at
>>>> To: jbturgid at hotmail.com
>>>> CC: cinetron at passport.ca; pd-list at iem.at
>>>> Subject: Re: [PD] gemmouse and pix_data
>>>>
>>>> Andrew Faraday wrote:
>>>>> Quick and simple solution to a lot of similar problems, use
>>> [range].
>>>>> It needs four arguments, the input range (in this case 0 to the
>>> size of your gemwin) as two arguments, and the output range (usually
>>> -4 to 4) and it will convert one into the other. Although to make this
>>> work on gem you need one for each of the x and y axes. 
>>>>> You can do this by re-scaling yourself, although this does take
>>> more time and effort, but also can provide more control. In the end
>>> it's your own choice.
>>>> [gemmouse] will output coordinates in pixels by default.
>>>> however, you can specify the range manually, [gemmouse 1 1] will
>>> output
>>>> x=0..1 and y=0..1
>>>>
>>>> fgmsadr
>>>> IOhannes
>>>>
>>> I'm not entirely sure, but this would probably still be centred on the
>>> top left corner of the gem window, so would still require some
>>> arithmetic to sync up objects to mouse position.
>> No, if you read the help about [pix-data], you only need the range
>> between 0 and 1 :
>> The coordinates within the image (x-pos, y-pos) range from (0.0f, 0.0f)
>> (left-bottom) to (1.0f, 1.0f) (right-top).
>> So [gemmouse 1 1] is enough (on Linux you have to invert the values on Y
>> axe).
>> Your example is good for a square GEM window and return the position in
>> its space (not in the pix 'space' of a picture). (I'm not sure to be
>> clear here ?)
>> Have a look at the attached patch.
>> ++
>>
>> Jack
>>
>>
>>> Something like
>>>
>>> [gemmouse 8 8]
>>> |                     |
>>> [- 4]               [- 4]
>>>
>>>
>>>
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> 
> 
> 
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