Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I think you'd be best off with the scheme you suggest towards the end — keeping the OpenGL view static and outside of the scroll view, and moving its contents so as to match the movement of the scroll view.</p> <p>Assuming you're using a <code>GLKView</code>, implement your <code>glkView:drawInRect:</code> so that it gets the <code>contentOffset</code> (and, probably, the <code>bounds</code>) properties from your scroll view and draws appropriately. E.g. (pretending you're using GLES 1.0 just because the matrix manipulation methods are so well known):</p> <pre><code>- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // displayArea will be the area the scroll view is // currently displaying; taking just the bounds would // likely be fine too CGRect displayArea; displayArea.origin = scrollView.contentOffset; displayArea.size = scrollView.bounds.size; // assuming (0, 0) in the GL view is in the centre, // we'll adjust things so that it's in the corner ala // UIKit CGPoint centre = CGPointMake( displayArea.origin.x + displayArea.size.width*0.5f, displayArea.origin.y + displayArea.size.height*0.5f); glPushMatrix(); // apply the scroll as per the scroll view // so that its centre is aligned with our centre glTranslatef(-centre.x, -centre.y, -1); /* rest of drawing here */ glPopMatrix(); } </code></pre> <p>Then connect yourself as a delegate to the scrollview and just perform:</p> <pre><code>- (void)scrollViewDidScroll:(UIScrollView *)scrollView { [glView setNeedsDisplay]; } </code></pre> <p>To ensure the GL redraws whenever the scroll view is scrolled.</p>
    singulars
    1. This table or related slice is empty.
    1. POiOS OpenGL layer and UIScrollView
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USTommy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POiOS OpenGL layer and UIScrollView
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload