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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