multi-touch | 易学教程

Android Multi-touch event problems…No new touch events while dragging?

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问题 So what I'm trying to make is a little space game, You control the ship with a graphic on-screen joystick using touch and drag . I have gotten this to work fine. The problem arises once I started to try and add the ability to touch the top portion of the screen to fire a weapon. For some reason, if you are currently dragging the joystick it seems to ignore the other touch input and doesn't do anything (But it works fine once I stop holding the joystick ). This is my both my first time working

After displaying and dismissing the Modal View Controller UIImagePickerController my Cocos2d iPhone app doesn't see multiple touches anymore

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问题 I have an app where I display the photo chooser (UIImagePickerController) but after the user dismisses it only single touches are working. And I think I know the root of the issue, but I don't know how to solve it... Before I show the modal dialog the stack during a touch is as follows: ... #3 0x00074de0 in -[EAGLView touchesBegan:withEvent:] at EAGLView.m:289 #4 0x30910f33 in -[UIWindow _sendTouchesForEvent:] ... But after showing and then removing the modal dialog the stack has these two

Does targetTouches track touches moving simultaneously on multiple elements?

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问题 Suppose I've got four fingers down: two fingers (1, 2) in element A and two (3, 4) in element B. Suppose I then move finger 1 and finger 3. I should be looking at a touchmove event which will contain changedTouches containing fingers 1 and 3. However what will targetTouches contain? Will it contain 1 and 2, or 3 and 4, or all 4? It seems like the only way to provide enough info about the fact that 1 and 2 are on the same element and 3 and 4 are both on a different element is to send two

Google Maps Using Touch Events That Don't Target It

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问题 I am trying to build a web application that has true multi touch capabilities. For example, I want to be able to drag a container around the screen while also zooming/panning on a google map at the same time. The problem that I am having is that if I am touching somewhere else on the page (not on the map) and then I touch on the map with another finger, the map acts as if both fingers were touching the map. This results in trying to pan on the google map with one finger turning into zooming

How do you get multiple touch buttons to work with touchesBegan/Moved?

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问题 I have a bunch of buttons that I want to activate in three different ways. Touch Down Touch Down - multiple touch (at the same time) Touch Drag Inside (The same as dragging your finger over a piano) The first two is obviously easy in IB. However many people, including myself, have had trouble with Touch Drag inside. So I ended up using - (void) touchesMoved [see code] . This works great for the drag... but to get it to work I had to disable the buttons "user Interaction" in IB. Which means I

Overlay App that reacts only on some touch events

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问题 I'm currently diving into Android development and recently came up against a difficulty. I'd like to create an overlay app, which lies on top of all other apps. It should listen for a three finger swipe, whereas all other Touch Events should be handled by the OS (e.g. an underlying app). Is that even possible? I already found out that I need to add the LayoutParam TYPE_PHONE instead of SYSTEM_ALERT since the latter one will consume all touch events. So my class looks like this now: package [.

How do I detect multitouch actions in a Windows 8 metro app?

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问题 I am working on a metro app right now and I'm looking to enable multitouch. I've browsed around google, but I can't seem to find any API to support it. Can someone point me in the right direction to support multitouch actions in a Windows 8 Metro app? 回答1: What exactly are you trying to do? There are Touch, Pointer (an abstraction around touch/mouse/stylus), and Manipulation events on every UI element 回答2: In JavaScript you can use the event.pointerId to detected multiple touch inputs. This

How to calculate the diameter of the TouchPoint on an iPhone,iPad and Android Device?

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Now i understand we can have 5 touch points by default in iPhone and have varied touch points enabled onto the different SDKs. However i have accomplished registering the touch points and getting distances, actual number of touch points. I would want to know if there's a way to accomplish and get the Diameter of a particular touch point for e.g. calculating the thumb touch in comparison with the index finger, Any ideas? I think Apple makes it fairly clear that they don't intend to give third-party developers access to low-level multi-touch information. From Apple's documentation on Event

Does targetTouches track touches moving simultaneously on multiple elements?

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Suppose I've got four fingers down: two fingers (1, 2) in element A and two (3, 4) in element B. Suppose I then move finger 1 and finger 3. I should be looking at a touchmove event which will contain changedTouches containing fingers 1 and 3. However what will targetTouches contain? Will it contain 1 and 2, or 3 and 4, or all 4? It seems like the only way to provide enough info about the fact that 1 and 2 are on the same element and 3 and 4 are both on a different element is to send two touchmove events. I'm building a touch framework and I have been constructing a global datastructure that

Android multi touch and double tap working together for an imageview

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问题 Hi I have two imageviews in a LinearLayout(Vertical orientation). I am setting setOnTouchListener for both the Imageviews. This way i am able to observe the Multi touch zoom as well as all the dragging of the ImageViews. The problem comes when i try to implement OnDoubletapListener. OnDoubleTapListener works only without the use of setOnTouchListener. However if i comment the setOnTouchListner then i am able to perform Double Tap.. Can't the two feartures work simultaneously????? If You want