The expression works like magic! :)
I have one last stupid question about this. I have now published the
outputs of the expressions, but how can I read the values from the
cocoa app? I suppose somehow using QCPatchController, but I only know
how to set values, not how to retrieve them (maybe this is a question
for cocoa-dev?)
12 jan 2009 kl. 13.30 skrev Chris Wood:
For hit testing, the hit area is normally:
x - (width / 2) to x + (width + 2)
y - (height / 2) to y + (height + 2)
You can do the whole lot inside a single mathematical expression
patch with:
(mouseX > (x - (width / 2))) && (mouseX < (x + (width / 2))) &&
(mouseY > (y - (height / 2))) && (mouseY < (y + (height / 2)))
Whether it's better to do it in QC or in your app depends on the
case, but QC is generally easier as the mouse coordinates are
already converted for you (i.e. the mouse position reported by the
Mouse patch will match the x/y/size coordinates on the billboards).
Doing the actual handling of an interface or something in QC can be
quite a pain, as you're limited to javascript and a ton of wires,
but it's easy enough to hit test in QC and pass the result back to
your cocoa app.
Chris
2009/1/12 Jonathan Selander <[email protected]>
Ahh, yes, of course. I'm still trying to figure out how to calculate
the position using the width. I underestand why it's 0-0.5 when it's
at 0.5 and 0.25 width, but with other examples I fail to get it right.
I've got the width and X/Y positions defined outside the billboards
already, so I should be able to use some logic to get what I need.
Do you think it's best to put this logic in the cocoa application or
in the quartz composition?
/Jonathan
12 jan 2009 kl. 11.26 skrev Chris Wood:
Jonathan,
The image origin doesn't actually refer to the 'position on screen',
it refers to something more like the 'texture offset', which is
sometimes useful (and sometimes a real pain) when you're doing core
image processing. It generally doesn't affect the position you see
the image, but if you're doing things like adding one image over
another image it can be important as it affects the position there.
The 'position on screen' will depend more on where you're telling it
to draw (as you have to give the sprite/billboard/etc. a position
and a size for it to draw), so you should actually already have the
position. E.g. if you have a billboard at position 0.25, 0.25 and
size 0.5, 0.5 you just need to test if the mouse is in the range x 0
to 0.5 on x and 0 to 0.5 on y.
Let me know if you need help with something more specific.
Chris
2009/1/12 Jonathan Selander <[email protected]>
Hi, i'm trying to find where in the view an image is positioned, but
image origin always reports 0. I read in the doc that it's like this
if the dimensions are infinite, but what does that really mean?
I'm trying to create a patch that determines whether or not the
mouse cursor is over the image.
Thanks
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