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Yet more fixes for bugs in the X11 zoom clipping code. Hopefully all sorted

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now. Still need to optimise the code a bit.


git-svn-id: http://svn.osgeo.org/qgis/trunk@3136 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
g_j_m 2005-04-12 10:23:06 +00:00
parent 72eb589963
commit e75d32ed0d
2 changed files with 23 additions and 17 deletions
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22
src/qgsclipper.cpp
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@ -69,8 +69,8 @@ bool QgsClipper::trimLine(QgsPoint& from, QgsPoint& to)
QgsPoint trimmedTo = to, trimmedFrom = from;
// Check for the need to trim first
if (from.x() < minX || from.x() > maxX || to.x() < minX || to.x() > maxX ||
from.y() < minY || from.y() > maxY || to.y() < minY || to.y() > maxY)
if (std::abs(from.x()) > maxX || std::abs(to.x()) > maxX ||
std::abs(from.y()) > maxY || std::abs(to.y()) > maxY)
{
// Check the top boundary
double r_n = (from.y() - minY) * (maxX - minX);
@ -213,19 +213,25 @@ bool QgsClipper::trimLine(QgsPoint& from, QgsPoint& to)
}
}
}
// If the line hasn't been trimmed yet, it is entirely outside the
// boundary, so tell the calling code.
if (!toDone && !fromDone)
// Done something, so leave.
if (toDone || fromDone)
{
to = trimmedTo;
from = trimmedFrom;
return true;
}
// If the line hasn't been trimmed yet, it is entirely outside the
// boundary, so tell the calling code.
if (!toDone && !fromDone)
return false;
// Shouldn't get here
std::cerr << "XXXXXXXXXXXXXXXXXXXXXXXXXXX\n";
}
to = trimmedTo;
from = trimmedFrom;
// The line is inside the boundary. Needs to be drawn.
return true;
}