Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. QGraphicsView draw items not visible in view...
Forum Updated to NodeBB v4.3 + New Features

QGraphicsView draw items not visible in view...

Scheduled Pinned Locked Moved Unsolved General and Desktop
qgraphicsview
2 Posts 2 Posters 685 Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • D Offline
    D Offline
    Dariusz
    wrote on last edited by
    #1

    Hey

    I have a graph with some lines. Some of the lines are very large, and the bounding box extend pass the screen, Sadly at that point QGraphicsView decides to not draw item & my line dissapears.

    Say if i Have a rect item at 500/500, and inside that item I have a path that stretches all the way to 0,0. But my view only show 100x100 rect. So the rect far away + path of it does not render.

    How can I "force" qgraphicsView to draw items regardless of their visibility on screen?

    TIA

    JonBJ 1 Reply Last reply
    0
    • D Dariusz

      Hey

      I have a graph with some lines. Some of the lines are very large, and the bounding box extend pass the screen, Sadly at that point QGraphicsView decides to not draw item & my line dissapears.

      Say if i Have a rect item at 500/500, and inside that item I have a path that stretches all the way to 0,0. But my view only show 100x100 rect. So the rect far away + path of it does not render.

      How can I "force" qgraphicsView to draw items regardless of their visibility on screen?

      TIA

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by
      #2

      @Dariusz
      I admit I have not tried it, but it would seem very strange to me if "Sadly at that point QGraphicsView decides to not draw item & my line dissapears.". I would expect it merely to clip whatever there is to the visible view area; if it omitted it completely QGraphicsView would surely be unusable.

      Say if i Have a rect item at 500/500, and inside that item I have a path that stretches all the way to 0,0.

      What do you mean by this? Are you putting further line items on top of a rect item as children? The vital thing is that you must not draw outside a QGraphicsItem::boundingRect() and QGraphicsItem::childrenBoundingRect(). If you do, the view will misdraw. You can override QGraphicsItem::boundingRect() for your items if you need to. Is this perhaps your situation?

      1 Reply Last reply
      0

      • Login

      • Login or register to search.
      • First post
        Last post
      0
      • Categories
      • Recent
      • Tags
      • Popular
      • Users
      • Groups
      • Search
      • Get Qt Extensions
      • Unsolved