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Chipmunk Physics • View topic - Object's pushed by touch

Object's pushed by touch

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Object's pushed by touch

Postby tobe_sta » Thu Mar 22, 2012 10:29 pm

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Re: Object's pushed by touch

Postby slembcke » Fri Mar 23, 2012 1:15 pm

You have a number of options. You could insert a new circle that moves around with the touch. You'd want to control the circle's body much like the mouse grabbing works in the demo app. You could apply forces based on distance to the touch. This would be pretty simple.
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Re: Object's pushed by touch

Postby tobe_sta » Sun Mar 25, 2012 8:52 pm

Thanks for the reply.

I don't think creating a circle at the touch location would work as desired. If the user moves their finger quickly around screen, the circle would lag behind the touch and create a delayed response time.

How would forces based on distance to touch work?
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Re: Object's pushed by touch

Postby slembcke » Mon Mar 26, 2012 10:01 am

What would cause lag with that? You do need to smooth out the coarse input some, so that will cause a little lag, but that's unavoidable.

Having a rigid object to collide with is going to be your best option. Using forces will just make things feel mushy and increase the lag further.
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Re: Object's pushed by touch

Postby tobe_sta » Mon Mar 26, 2012 11:33 pm

When I talk about lag, I mean the touch screen latency (as shown here ). I will try out the circle that follows the touch around, see how it feels.

How do you target the object within the chipmunk space? I can set the view that houses the circle to the touch location, but the space object doesn't move with it (which is weird because it separates the uibutton circle and the chipmunk circle).
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Re: Object's pushed by touch

Postby slembcke » Tue Mar 27, 2012 10:38 am

You have to tell the rigid body to move either by applying forces, adding constraints to it or updating its position and velocity.
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Re: Object's pushed by touch

Postby tobe_sta » Wed Mar 28, 2012 8:13 pm

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Re: Object's pushed by touch

Postby slembcke » Thu Mar 29, 2012 10:20 am

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Re: Object's pushed by touch

Postby tobe_sta » Mon Apr 02, 2012 3:44 am

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