Method question

Glen Bojsza gbojsza at gmail.com
Tue Nov 9 14:57:37 EST 2010


Hi Phil,

Yes it works BUT it doesn't constrain itself to the graphic.

I want it to only to report the points if the user includes the graphic when
they d their drag... as it currently stands it reports coordinates even if
the user does not drag across the graphic.

But other that that it is total a different perspective on how I was looking
at the problem... I was too focused on the graphic.

thanks,

Glen

On Tue, Nov 9, 2010 at 12:27 PM, Phil Davis <revdev at pdslabs.net> wrote:

> Hi Glen,
>
> See if this works:
>
>
> -- card script --
>
> local h1, h2, v1, v2
>
>
> on mouseDown
>   put the clickH into h1
>   put the clickV into v1
> end mouseDown
>
>
> on mouseUp
>   put the mouseH into h2
>   put the mouseV into v2
>   put grcDragRegion()
> end mouseUp
>
>
> function grcDragRegion
>   -- define mouse drag rect
>   put min(h1,h2) into tMouseLeft
>   put max(h1,h2) into tMouseRight
>   put min(v1,v2) into tMouseTop
>   put max(v1,v2) into tMouseBottom
>
>   -- define overlap of mouse drag rect & grc rect
>   put max(tMouseLeft, the left of grc 1) into item 1 of tOverlapRect
>   put max(tMouseTop, the top of grc 1) into item 2 of tOverlapRect
>   put min(tMouseRight, the right of grc 1) into item 3 of tOverlapRect
>   put min(tMouseBottom, the bottom of grc 1) into item 4 of tOverlapRect
>
>   -- return it
>   return tOverlapRect
> end grcDragRegion
>
> Phil Davis
>
>
>
> On 11/9/10 10:48 AM, Glen Bojsza wrote:
>
>> I have a problem which I am not certain which method is valid or should be
>> used (with Rev / Livecode there are sometimes too many ways of achieving a
>> goal).
>>
>> I have a graphic on a card left 62 right 462.
>>
>> My objective is to allow a user to left click and drag across the graphic
>> as
>> if selecting a section of it.
>>
>> I need start left,top,right,bottom and end left,top,right,bottom.
>>
>> The only interest is knowing the start of the drag when inside the graphic
>> and the end of the drag inside the graphic... with the following caveats.
>>
>>
>>    - The user may start the drag either outside the graphic and then
>>    continue the drag into the graphic (which is the start point) or start
>> the
>>    drag inside the graphic which would be the start point.
>>    - The user may release the mouse button inside the graphic which
>>    indicates the stop point or release the mouse button outside the
>> graphic
>>    where the stop point is at the point of the mouse leaving the graphic.
>>
>>
>> This seems like it should be simple but I am getting tied down but trying
>> to
>> over complicate it?
>>
>> This is for Windows and Linux .
>>
>> Any elegant or simple solutions out there?
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>>
> --
> Phil Davis
>
> PDS Labs
> Professional Software Development
> http://pdslabs.net
>
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