title: Dia export not satisfactory
body: <p>I'm using Dia for modeling UML diagrams, but the export to png or eps doesn't make me happy. Many lines aren't straight anymore for certain zoom levels!</p>
  
  <p>Is this a problem of the viewer (in this case gwenview)?
  Do I something wrong when I set the lines or is there a function in Dia to prevent this problem?</p>
  
  <p>Thanks in advance!</p>