[QGIS Commit] r13166 - trunk/qgis/src/core/symbology-ng
svn_qgis at osgeo.org
svn_qgis at osgeo.org
Fri Mar 26 16:03:28 EDT 2010
Author: wonder
Date: 2010-03-26 16:03:24 -0400 (Fri, 26 Mar 2010)
New Revision: 13166
Modified:
trunk/qgis/src/core/symbology-ng/qgssymbollayerv2utils.cpp
Log:
fixed several bugs related to creation of offset line in new symbology (including #2545)
Modified: trunk/qgis/src/core/symbology-ng/qgssymbollayerv2utils.cpp
===================================================================
--- trunk/qgis/src/core/symbology-ng/qgssymbollayerv2utils.cpp 2010-03-26 15:31:37 UTC (rev 13165)
+++ trunk/qgis/src/core/symbology-ng/qgssymbollayerv2utils.cpp 2010-03-26 20:03:24 UTC (rev 13166)
@@ -286,15 +286,17 @@
return false;
// tangent
- t = ( x1 == x2 ? t = DBL_MAX : ( y2 - y1 ) / ( x2 - x1 ) );
+ t = ( x1 == x2 ? DBL_MAX : ( y2 - y1 ) / ( x2 - x1 ) );
// angle
if ( t == DBL_MAX )
- angle = ( y2 >= y1 ? M_PI / 2 : M_PI * 3 / 2 ); // angle is 90 or 270
+ angle = ( y2 > y1 ? M_PI / 2 : M_PI * 3 / 2 ); // angle is 90 or 270
+ else if ( t == 0 )
+ angle = ( x2 > x1 ? 0 : M_PI ); // angle is 0 or 180
else if ( t >= 0 )
- angle = ( y2 >= y1 ? atan( t ) : M_PI + atan( t ) );
+ angle = ( y2 > y1 ? atan( t ) : M_PI + atan( t ) );
else // t < 0
- angle = ( y2 >= y1 ? M_PI + atan( t ) : M_PI * 2 + atan( t ) );
+ angle = ( y2 > y1 ? M_PI + atan( t ) : atan( t ) );
return true;
}
@@ -308,8 +310,8 @@
// calc intersection of two (infinite) lines defined by one point and tangent
static QPointF linesIntersection( QPointF p1, double t1, QPointF p2, double t2 )
{
- // parallel lines?
- if (( t1 == DBL_MAX && t2 == DBL_MAX ) || t1 == t2 )
+ // parallel lines? (or the difference between angles is less than cca 0.1 degree)
+ if (( t1 == DBL_MAX && t2 == DBL_MAX ) || fabs( t1 - t2 ) < 0.001 )
return QPointF();
double x, y;
@@ -346,6 +348,7 @@
double angle = 0.0, t_new, t_old = 0;
QPointF pt_old, pt_new;
QPointF p1 = polyline[0], p2;
+ bool first_point = true;
for ( int i = 1; i < polyline.count(); i++ )
{
@@ -356,11 +359,12 @@
pt_new = offsetPoint( p1, angle + M_PI / 2, dist );
- if ( i != 1 )
+ if ( ! first_point )
{
// if it's not the first line segment
// calc intersection with last line (with offset)
- pt_new = linesIntersection( pt_old, t_old, pt_new, t_new );
+ QPointF pt_tmp = linesIntersection( pt_old, t_old, pt_new, t_new );
+ if ( !pt_tmp.isNull() ) pt_new = pt_tmp;
}
newLine.append( pt_new );
@@ -368,6 +372,7 @@
pt_old = pt_new;
t_old = t_new;
p1 = p2;
+ first_point = false;
}
// last line segment:
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