Stevon Ritchie <[EMAIL PROTECTED]>
> I have made a vector shape on the fly with the vertexlist defined by
> the path of the dragged mouse... I would like to use this as a
> selection tool
Hi Stevon,
If I understand correctly, any sprite which intersects with the enclosed
part of the vector shape should be selected. I can imagine two
solutions (there are doubtless others).
* An image-based solution, where you create a bitmap image of your
vector shape, and use matte ink with the bitmap image to check for
intersections. You could momentarily swap the bitmap into the sprite
which contains the vector shape, perform your matte-ink intersection
check, then swap the vector shape back.
* A geometry-based solution where you would use the rect of the vector
shape sprite to shortlist candidates for intersection. You would then
use rect and line maths to determine which of those sprites is crossed
by one of the sides of the vector shape. Any sprites which are
crossed by a side will be included in your selection. Those which are
not are either entirely inside or entirely outside the vectorshape:
you would need to check if an arbitrary point inside such a sprite is
inside the vector shape. You can find an algorithm for this
(commented in French) at:
>> http://perso.planetb.fr/newton/irregulier.dir
The first solution will doubtless use fewer lines of Lingo and relies on
Director's internal code to do the lion's share of the work; the second
uses Lingo that is fast.
Does this help at all?
James
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