fix for #4500, endlessloop because of too small tolerance

rduivenvoorde · alexbruy · commit 3a58d8c0cba0 · 2011-12-02T14:20:14.000+02:00
diff --git a/src/app/qgsmaptoolsimplify.cpp b/src/app/qgsmaptoolsimplify.cpp
@@ -212,7 +212,7 @@ bool QgsMapToolSimplify::calculateSliderBoudaries()
         bottomFound = true;
         highTol = tol;
         tol = ( highTol + lowTol ) / 2;
-        if ( doubleNear( highTol, lowTol ) )
+        if ( doubleNear( highTol, lowTol, 0.0001 ) ) // without 0.0001 tolerance sometimes an endless loop in epsg:4326
         { //solving problem that two points are in same distance from  line, so they will be both excluded at same time
           //so some time more than required count of vertices can stay
           found = true;
@@ -226,7 +226,7 @@ bool QgsMapToolSimplify::calculateSliderBoudaries()
       {
         lowTol = tol;
         tol = ( highTol + lowTol ) / 2;
-        if ( doubleNear( highTol, lowTol ) )
+        if ( doubleNear( highTol, lowTol, 0.0001 ) ) // without 0.0001 tolerance sometimes an endless loop in epsg:4326
         { //solving problem that two points are in same distance from  line, so they will be both excluded at same time
           //so some time more than required count of vertices can stay
           found = true;
