android-multitouch-controller
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lukehutch
Add pinch-zoom/drag of entire canvas
If the user pinch-zooms or drags outside of an individual image in the photo
sorter demo, the whole canvas should be zoomed/panned, not just individual
photos.
This will require another coordinate system transform, and separate
restrictions on what sorts of operations are valid on the canvas and on objects
on the canvas (e.g. maybe the canvas can't be rotated, but objects can).
Original issue reported on code.google.com by luke.hutch on 30 Apr 2013 at 4:30
hi
is there already a solution?
or an idea how it works?!
Original comment by [email protected] on 29 Aug 2013 at 10:19
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You would check if the two touch points are outside all objects, then change
the scale factor and origin of the canvas. The code is just a demo though, it
isn't intended to be a fully-fledged canvas system, so I don't know if I will
ever get time to implement this.
Original comment by luke.hutch on 30 Aug 2013 at 12:19
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Thx for the reply!
My first idea or workaround was to implement a ScaleGestureDetector for scaling
or a GestureDetecor for panning the whole canvas. The MultitouchListener only
got the ontouchevent if it's over an object. This is not pretty because, there
are many calls and checks if their is an object and I also have to scale and
reposition all object.
The Second idea is to add a method "nothingToDrag(PointInfo, PositionScale)" to
the ObjectCanvas interface. This would be called if the selectedObject is null
on the performDragOrPinch() (Line 400).
Did you mean that I should check the position of outside objects in the
selectObject method (MultitouchObjectCanvas)? How I can handle this?
When I got a good solution you can use it as example!
good morning from europe;)
For further information: As base for my code I used the PhotoSample.
Original comment by [email protected] on 30 Aug 2013 at 7:15
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Hi there, first of all thank you for the app I wonder how can I change your code to support multi touch simultaneously for several users, in other words users can zoom, rotate and drag several image simultaneously. you are using the history of every touch event in your app, how can we use the specific history for every image object in multi touch canvas? is this a good idea??
