Long awaited fix for clipping issues with hard markers.

Problem is caused by logic that wants to draw marker onto od number of pixel dimentions always, without having a large enough pixmap allocated to draw it onto.
There is still a problem with diamond marker but other markers are looking good.


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5151 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: timlinux

src/core/qgsmarkercatalogue.cpp

@@ -28,6 +28,7 @@ email                : blazek@itc.it
 #include <QPicture>
 #include <QSvgRenderer>
 
+#include "qgis.h"
 #include "qgsapplication.h"
 #include "qgsmarkercatalogue.h"
 
@@ -89,36 +90,12 @@ QPixmap QgsMarkerCatalogue::marker ( QString fullName, int size, QPen pen, QBrus
   //std::cerr << "QgsMarkerCatalogue::marker " << fullName.toLocal8Bit().data() << " sice:" << size << std::endl;
   if ( fullName.left(5) == "hard:" ) 
   {
-    QPicture myPicture = hardMarker ( fullName.mid(5), size, pen, brush, qtBug ); 
-    QPixmap myPixmap = QPixmap (myPicture.width(),myPicture.height());
-
-    // The following is window-system-conditional since (at least)
-    // the combination of Qt 4.1.0 and RealVNC's Xvnc 4.1
-    // will result in the pixmap becoming invisible if it is filled
-    // with a non-opaque colour.
-    // This is probably because Xvnc 4.1 doesn't have the RENDER
-    // extension compiled into it.
-#if defined(Q_WS_X11)
-    // Do a runtime test to see if the X RENDER extension is available
-    if ( myPixmap.x11PictureHandle() )
-    {
-#endif
-      myPixmap.fill(QColor(255,255,255,0)); // transparent
-#if defined(Q_WS_X11)
-    }
-    else
-    {
-      myPixmap.fill(QColor(255,255,255)); // opaque
-    }
-#endif
-
-    QPainter myPainter(&myPixmap);
-    myPainter.drawPicture(0,0,myPicture);
-    return myPixmap;
-  } else if ( fullName.left(4) == "svg:" ) {
+    return hardMarker ( fullName.mid(5), size, pen, brush, qtBug ); 
+  } 
+  else if ( fullName.left(4) == "svg:" ) 
+  {
     return svgMarker ( fullName.mid(4), size ); 
   }
-
   return QPixmap(); // empty
 }
 
@@ -160,38 +137,61 @@ QPixmap QgsMarkerCatalogue::svgMarker ( QString filename, int scaleFactor)
   return myPixmap;
 }
 
-QPicture QgsMarkerCatalogue::hardMarker ( QString name, int s, QPen pen, QBrush brush, bool qtBug )
+QPixmap QgsMarkerCatalogue::hardMarker ( QString name, int s, QPen pen, QBrush brush, bool qtBug )
 {
+  QPixmap myPixmap = QPixmap (s+1,s+1);
+
+  // The following is window-system-conditional since (at least)
+  // the combination of Qt 4.1.0 and RealVNC's Xvnc 4.1
+  // will result in the pixmap becoming invisible if it is filled
+  // with a non-opaque colour.
+  // This is probably because Xvnc 4.1 doesn't have the RENDER
+  // extension compiled into it.
+#if defined(Q_WS_X11)
+  // Do a runtime test to see if the X RENDER extension is available
+  if ( myPixmap.x11PictureHandle() )
+  {
+#endif
+    myPixmap.fill(QColor(255,255,255,0)); // transparent
+#if defined(Q_WS_X11)
+  }
+  else
+  {
+    myPixmap.fill(QColor(255,255,255)); // opaque
+  }
+#endif
+
+  QPainter myPainter(&myPixmap);
   // Size of polygon symbols is calculated so that the area is equal to circle with 
   // diameter mPointSize
 
-  QPicture picture;
 
   // Size for circle
   int half = (int)floor(s/2.0); // number of points from center
   int size = 2*half + 1;  // must be odd
   double area = 3.14 * (size/2.) * (size/2.);
 
   // Picture
-  QPainter picpainter;
-  picpainter.begin(&picture);
-  picpainter.setRenderHint(QPainter::Antialiasing);
+  QPicture picture;
+  myPainter.begin(&picture);
+  myPainter.setRenderHint(QPainter::Antialiasing);
 
   // Also width must be odd otherwise there are discrepancies visible in canvas!
   int lw = (int)(2*floor((double)pen.width()/2)+1); // -> lw > 0
   pen.setWidth(lw);
-  picpainter.setPen ( pen );
-  picpainter.setBrush( brush);
-
+  myPainter.setPen ( pen );
+  myPainter.setBrush( brush);
   QRect box;
+
   if ( name == "circle" ) 
   {
-    picpainter.drawEllipse(0, 0, size, size);
+    std::cout << "Drawing circle of " << size << std::endl;
+    myPainter.drawEllipse(0, 0, size, size);
   } 
   else if ( name == "rectangle" ) 
   {
     size = (int) (2*floor(sqrt(area)/2.) + 1);
-    picpainter.drawRect(0, 0, size, size);
+    myPainter.drawRect(0, 0, size, size);
   } 
   else if ( name == "diamond" ) 
   {
@@ -201,9 +201,9 @@ QPicture QgsMarkerCatalogue::hardMarker ( QString name, int s, QPen pen, QBrush
     pa.setPoint ( 1, half, 2*half);
     pa.setPoint ( 2, 2*half, half);
     pa.setPoint ( 3, half, 0);
-    picpainter.drawPolygon ( pa );
+    myPainter.drawPolygon ( pa );
   }
-  // Warning! if pen width > 0 picpainter.drawLine(x1,y1,x2,y2) will draw only (x1,y1,x2-1,y2-1) !
+  // Warning! if pen width > 0 myPainter.drawLine(x1,y1,x2,y2) will draw only (x1,y1,x2-1,y2-1) !
   // It is impossible to draw lines as rectangles because line width scaling would not work
   // (QPicture is scaled later in QgsVectorLayer)
   //  -> reset boundingRect for cross, cross2
@@ -219,8 +219,8 @@ QPicture QgsMarkerCatalogue::hardMarker ( QString name, int s, QPen pen, QBrush
       add = 0;
     }
 
-    picpainter.drawLine(0, half, size-1+add, half); // horizontal
-    picpainter.drawLine(half, 0, half, size-1+add); // vertical
+    myPainter.drawLine(0, half, size-1+add, half); // horizontal
+    myPainter.drawLine(half, 0, half, size-1+add); // vertical
     box.setRect ( 0, 0, size, size );
   }
   else if ( name == "cross2" ) 
@@ -237,18 +237,17 @@ QPicture QgsMarkerCatalogue::hardMarker ( QString name, int s, QPen pen, QBrush
 
     int addwidth = (int) ( 0.5 * lw ); // width correction, cca lw/2 * cos(45)
 
-    picpainter.drawLine( 0, 0, size-1+add, size-1+add);
-    picpainter.drawLine( 0, size-1, size-1+add, 0-add);
+    myPainter.drawLine( 0, 0, size-1+add, size-1+add);
+    myPainter.drawLine( 0, size-1, size-1+add, 0-add);
 
     box.setRect ( -addwidth, -addwidth, size + 2*addwidth, size + 2*addwidth );	
   }
-  picpainter.end();
-
   if ( name == "cross" || name == "cross2" ) 
   {
     picture.setBoundingRect ( box ); 
   }
+  myPainter.end();
 
-  return picture;
+  return myPixmap;
 }
 

src/core/qgsmarkercatalogue.h

@@ -56,7 +56,7 @@ class QgsMarkerCatalogue{
     QStringList mList;
 
     /** Hard coded */
-    QPicture hardMarker ( QString name, int size, QPen pen, QBrush brush, bool qtBug = true );
+    QPixmap hardMarker ( QString name, int size, QPen pen, QBrush brush, bool qtBug = true );
 
 };