speed up geometry validation in fTools (self-intersection detection; fixes #2262)

git-svn-id: http://svn.osgeo.org/qgis/trunk@12408 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

python/plugins/fTools/tools/doVisual.py

@@ -16,6 +16,8 @@ def __init__( self, iface, function ):
     self.manageGui()
     self.cancel_close = self.buttonBox_2.button( QDialogButtonBox.Close )
     self.progressBar.setValue( 0 )
+    self.partProgressBar.setValue( 0 )
+    self.partProgressBar.setEnabled( False )
 
   def keyPressEvent( self, e ):
     '''
@@ -111,6 +113,8 @@ def visual( self,  myLayer, myField, mySelection ):
     QObject.connect( self.testThread, SIGNAL( "runFinished(PyQt_PyObject)" ), self.runFinishedFromThread )
     QObject.connect( self.testThread, SIGNAL( "runStatus(PyQt_PyObject)" ), self.runStatusFromThread )
     QObject.connect( self.testThread, SIGNAL( "runRange(PyQt_PyObject)" ), self.runRangeFromThread )
+    QObject.connect( self.testThread, SIGNAL( "runPartRange(PyQt_PyObject)" ), self.runPartRangeFromThread )
+    QObject.connect( self.testThread, SIGNAL( "runPartStatus(PyQt_PyObject)" ), self.runPartStatusFromThread )
     self.cancel_close.setText( "Cancel" )
     QObject.connect( self.cancel_close, SIGNAL( "clicked()" ), self.cancelThread )
     self.testThread.start()
@@ -154,6 +158,16 @@ def runStatusFromThread( self, status ):
 
   def runRangeFromThread( self, range_vals ):
     self.progressBar.setRange( range_vals[ 0 ], range_vals[ 1 ] )
+
+  def runPartStatusFromThread( self, status ):
+    self.partProgressBar.setValue( status )
+    if status >= self.part_max:
+      self.partProgressBar.setEnabled( False )
+        
+  def runPartRangeFromThread( self, range_vals ):
+    self.part_max = range_vals[ 1 ]
+    self.partProgressBar.setEnabled( True )
+    self.partProgressBar.setRange( range_vals[ 0 ], range_vals[ 1 ] )
 
 class visualThread( QThread ):
   def __init__( self, parentThread, parentObject, function, vlayer, myField, mySelection ):
@@ -431,6 +445,7 @@ def check_geometry( self, vlayer ):
         if not self.isCorrectOrientation( geom ):
           lstErrors.append( self.tr( "Feature %1 has incorrect node ordering" ).arg( unicode( feat.id() ) ) )
           count += 1
+    self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nFeat )
     return ( lstErrors, count )
 
   def isHoleNested( self, polygon ):
@@ -459,16 +474,29 @@ def isPolygonClosed( self, polygon ):
     return True
 
   def isSelfIntersecting( self, polygon ):
+    cPart = 0
+    for h in polygon:
+      cPart += len(h)
+
+    self.emit( SIGNAL( "runPartRange(PyQt_PyObject)" ), ( 0, cPart ) )
+
+    nPart = 0
     for h in polygon:
-      count = 0
-      size = range( 0, len (h )- 1 )
-      for i in size:
+      for i in range( 0, len(h)-1 ):
+        self.emit( SIGNAL( "runPartStatus(PyQt_PyObject)" ), nPart )
+
         count = 0
-        for j in size:
+        for j in range( i+1, len(h)-1 ):
           if QgsGeometry().fromPolyline( [ h[ i ], h[ i + 1 ] ] ).intersects( QgsGeometry().fromPolyline( [ h[ j ], h[ j + 1 ] ] ) ):
             count += 1
-        if count > 3:
+        if count > 2:
+          self.emit( SIGNAL( "runPartStatus(PyQt_PyObject)" ), cPart )
           return True
+
+        nPart += 1
+
+    self.emit( SIGNAL( "runPartStatus(PyQt_PyObject)" ), cPart )
+
     return False
 
   def isCorrectOrientation( self, polygon ):

python/plugins/fTools/tools/frmVisual.ui

@@ -114,7 +114,28 @@
      </item>
     </layout>
    </item>
-   <item row="7" column="0">
+   <item row="3" column="0">
+    <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <widget class="QCheckBox" name="useSelected">
+       <property name="text">
+        <string>Use only selected features</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="8" column="1" rowspan="2">
+    <widget class="QDialogButtonBox" name="buttonBox_2">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+   <item row="9" column="0">
     <widget class="QProgressBar" name="progressBar">
      <property name="value">
       <number>24</number>
@@ -124,27 +145,19 @@
      </property>
     </widget>
    </item>
-   <item row="7" column="1">
-    <widget class="QDialogButtonBox" name="buttonBox_2">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+   <item row="8" column="0">
+    <widget class="QProgressBar" name="partProgressBar">
+     <property name="enabled">
+      <bool>false</bool>
      </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Ok</set>
+     <property name="value">
+      <number>24</number>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignCenter</set>
      </property>
     </widget>
    </item>
-   <item row="3" column="0">
-    <layout class="QVBoxLayout" name="verticalLayout">
-     <item>
-      <widget class="QCheckBox" name="useSelected">
-       <property name="text">
-        <string>Use only selected features</string>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
   </layout>
  </widget>
  <resources/>