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#9485: OffsetLine uses GEOSOffsetCurve (#if-#else-#endif) option

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ahuarte47 committed Feb 22, 2014
1 parent 8176c1c commit 540685a2f570c6fd9d34df8ee8832c08cfb5b7fa
Showing with 29 additions and 27 deletions.
  1. +29 −27 src/core/symbology-ng/qgssymbollayerv2utils.cpp
@@ -648,47 +648,48 @@ static QPointF linesIntersection( QPointF p1, double t1, QPointF p2, double t2 )

QPolygonF offsetLine( QPolygonF polyline, double dist )
{
QPolygonF newLine;

if ( polyline.count() < 2 )
return newLine;
return polyline;

QPolygonF newLine;

// need at least geos 3.3 for OffsetCurve tool
#if defined(GEOS_VERSION_MAJOR) && defined(GEOS_VERSION_MINOR) && \
((GEOS_VERSION_MAJOR>3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR>=3)))

if ( polyline.count() > 2 )
{
unsigned int i, pointCount = polyline.count();
unsigned int i, pointCount = polyline.count();

QgsPolyline tempPolyline( pointCount );
QPointF* tempPtr = polyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr++ ) tempPolyline[i] = QgsPoint( tempPtr->rx(), tempPtr->ry() );
QgsPolyline tempPolyline( pointCount );
QPointF* tempPtr = polyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr++ ) tempPolyline[i] = QgsPoint( tempPtr->rx(), tempPtr->ry() );

QgsGeometry* tempGeometry = QgsGeometry::fromPolyline( tempPolyline );
if ( tempGeometry )
{
const GEOSGeometry* geosGeom = tempGeometry->asGeos();
GEOSGeometry* offsetGeom = GEOSOffsetCurve( geosGeom, dist, 8 /*quadSegments*/, 0 /*joinStyle*/, 5.0 /*mitreLimit*/ );
QgsGeometry* tempGeometry = QgsGeometry::fromPolyline( tempPolyline );
if ( tempGeometry )
{
const GEOSGeometry* geosGeom = tempGeometry->asGeos();
GEOSGeometry* offsetGeom = GEOSOffsetCurve( geosGeom, dist, 8 /*quadSegments*/, 0 /*joinStyle*/, 5.0 /*mitreLimit*/ );

if ( offsetGeom )
{
tempGeometry->fromGeos( offsetGeom );
tempPolyline = tempGeometry->asPolyline();
if ( offsetGeom )
{
tempGeometry->fromGeos( offsetGeom );
tempPolyline = tempGeometry->asPolyline();

pointCount = tempPolyline.count();
newLine.resize( pointCount );
pointCount = tempPolyline.count();
newLine.resize( pointCount );

QgsPoint* tempPtr2 = tempPolyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr2++ ) newLine[i] = QPointF( tempPtr2->x(), tempPtr2->y() );
QgsPoint* tempPtr2 = tempPolyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr2++ ) newLine[i] = QPointF( tempPtr2->x(), tempPtr2->y() );

delete tempGeometry;
return newLine;
}
delete tempGeometry;
return newLine;
}
delete tempGeometry;
}
#endif

// returns original polyline when 'GEOSOffsetCurve' fails!
return polyline;

#else

double angle = 0.0, t_new, t_old = 0;
QPointF pt_old, pt_new;
@@ -724,8 +725,9 @@ QPolygonF offsetLine( QPolygonF polyline, double dist )
// last line segment:
pt_new = offsetPoint( p2, angle + M_PI / 2, dist );
newLine.append( pt_new );

return newLine;

#endif
}

/////

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