pinch

I'm building an app that uses the pinch zoom and drag. The problem is that for now I can drag the picture out of it bounds. I wanted to know how can I use drag and make sure the image stays on the screen at the same time. Here is my code : public boolean onTouch(View v, MotionEvent event) { ImageView view = (ImageView)v; //handle touch events here. switch (event.getAction() & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: savedMatrix.set(matrix); start.set(event.getX(), event.getY()); Log.d(TAG, "mode=DRAG" ); mode = DRAG; break; case MotionEvent.ACTION_POINTER_DOWN: oldDist =

I have a CollectionView that have one custom cell. I want to zoom in/out imageView in cell, so i add pinch gesture at CollectionView.m when i add gesture to self.collectionView, like this: [self.collectionView addGestureRecognizer:pinchGesture]; it works! my cell.imageView can zoom in/out, but when i pinch other place(not in cell's imageView, my cell.imageView still zoom in/out with the gesture, I want the cell.imageView zoom in/out just when user pinch the cell.imageView, so i try to add gesture use this code: [cell.imageView addGestureRecognizer:pinchGesture]; but unfortunately it doesn't

How does one implement pinch gestures on the iPhone? I'm familiar with using touch events on the iPhone but I'm extremely lazy and don't want to re-invent the wheel for something as widespread as PINCH gestures...Source code or links thereto would be helpful. Brock Woolf You need to implement it yourself using some basic math. (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event; Those are the delegate methods that you need to implement in your application. You need to get the distance between the two touches, then

Pinch and zoom is way too violent of an animation need to turn it down a notch. yeahdixon well i came up with this: since speed seems to be dependent on the min and max scroll speeds i kept them close to the min and max zooms every time it actually zooms using the uiscroll delegate - (void)scrollViewDidZoom:(UIScrollView *)scrollView { if(scrollView.multipleTouchEnabled){ CGFloat fSpeedZoom=.02; scrollView.maximumZoomScale=scrollView.zoomScale+fSpeedZoom; scrollView.minimumZoomScale=scrollView.zoomScale-fSpeedZoom; if(scrollView.maximumZoomScale>fMaxZoomScale) SV.maximumZoomScale=fMaxZoomScale

I've got a site running aimed at touchscreens running Firefox (very specific I know, but it will hopefully help with a solution) On the page in question, I've got a d3 map that I'm trying to enable pinch zooming for, however any pinch gesture is causing Firefox to set the zoom for the whole page. Is there a way to prevent the page zooming and only allow the map to zoom? It's not an issue if I have to modify Firefox config settings but I'd prefer to avoid it and rely entirely on javascript if possible. Thank you in advance You might be able to do this using the viewport metatag and Hammer.js