mods to rendering code

git-svn-id: http://svn.osgeo.org/qgis/trunk@40 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/qgisapp.cpp

@@ -20,6 +20,7 @@
 #include <qscrollview.h>
 #include <qstringlist.h>
 #include <qmessagebox.h>
+#include <qstatusbar.h>
 #include <qpixmap.h>
 #include <qsplitter.h>
 #include <qrect.h>
@@ -40,7 +41,7 @@
 #include "xpm/qgis.xpm"
 
 QgisApp::QgisApp (QWidget * parent, const char *name, WFlags fl):
-QgisAppBase (parent, name, fl)
+  QgisAppBase (parent, name, fl)
 {
   QPixmap icon;
   icon = QPixmap (qgis_xpm);
@@ -102,6 +103,7 @@ QgisApp::addLayer ()
 	}
       qApp->processEvents();
       mapCanvas->render2();
+      statusBar()->message(mapCanvas->extent().stringRep());
 
     }
 
@@ -117,9 +119,16 @@ void
 QgisApp::zoomIn ()
 {
   /*  QWMatrix m = mapCanvas->worldMatrix();
-     m.scale( 2.0, 2.0 );
+      m.scale( 2.0, 2.0 );
-     mapCanvas->setWorldMatrix( m );
+      mapCanvas->setWorldMatrix( m );
-   */
+  */
+  // scale the extent
+  QgsRect ext = mapCanvas->extent();
+  ext.scale(0.5);
+  mapCanvas->setExtent(ext);
+  statusBar()->message(ext.stringRep());
+  mapCanvas->clear();
+  mapCanvas->render2();
 
 }
 
@@ -127,115 +136,119 @@ void
 QgisApp::zoomOut ()
 {
   /*    QWMatrix m = mapCanvas->worldMatrix();
-     m.scale( 0.5, 0.5 );
+	m.scale( 0.5, 0.5 );
-     mapCanvas->setWorldMatrix( m );
+	mapCanvas->setWorldMatrix( m );
-   */
+  */
 
 
+}
+void QgisApp::zoomFull(){
+  mapCanvas->zoomFullExtent();
 }
 void
 QgisApp::readWKB (const char *connInfo, QStringList tables)
 {
-  PgCursor pgc (connInfo, "testcursor");
+//    PgCursor pgc (connInfo, "testcursor");
-  // get "endianness"
+//   // get "endianness"
-  char *chkEndian = new char[4];
+//   char *chkEndian = new char[4];
-  memset (chkEndian, '\0', 4);
+//   memset (chkEndian, '\0', 4);
-  chkEndian[0] = 0xE8;
+//   chkEndian[0] = 0xE8;
-  int *ce = (int *) chkEndian;
+//   int *ce = (int *) chkEndian;
-  bool isNDR = (232 == *ce);
+//   bool isNDR = (232 == *ce);
-  /*     if(*ce != 232)
+//   /*     if(*ce != 232)
-     cout << "Big endian" << endl;
+//   cout << "Big endian" << endl;
-     else
+//   else
-     cout << "Little endian" << endl;
+//   cout << "Little endian" << endl;
-   */
+//   */
-  QStringList::Iterator it = tables.begin ();
+//   QStringList::Iterator it = tables.begin ();
-  while (it != tables.end ())
+//   while (it != tables.end ())
-    {
+//     {
 
-      // get the extent of the layer
+//       // get the extent of the layer
-      QString esql = "select extent(the_geom) from " + *it;
+//       QString esql = "select extent(the_geom) from " + *it;
-      PgDatabase *pd = new PgDatabase (connInfo);
+//       PgDatabase *pd = new PgDatabase (connInfo);
-      int result = pd->ExecTuplesOk ((const char *) esql);
+//       int result = pd->ExecTuplesOk ((const char *) esql);
-      QString extent = pd->GetValue (0, 0);
+//       QString extent = pd->GetValue (0, 0);
-      // parse out the x and y values
+//       // parse out the x and y values
-      extent = extent.right (extent.length () - extent.find ("BOX3D(") - 6);
+//       extent = extent.right (extent.length () - extent.find ("BOX3D(") - 6);
-      QStringList coordPairs = QStringList::split (",", extent);
+//       QStringList coordPairs = QStringList::split (",", extent);
-      QStringList x1y1 = QStringList::split (" ", coordPairs[0]);
+//       QStringList x1y1 = QStringList::split (" ", coordPairs[0]);
-      QStringList x2y2 = QStringList::split (" ", coordPairs[1]);
+//       QStringList x2y2 = QStringList::split (" ", coordPairs[1]);
-      double x1 = x1y1[0].toDouble ();
+//       double x1 = x1y1[0].toDouble ();
-      double y1 = x1y1[1].toDouble ();
+//       double y1 = x1y1[1].toDouble ();
-      double x2 = x2y2[0].toDouble ();
+//       double x2 = x2y2[0].toDouble ();
-      double y2 = x2y2[1].toDouble ();
+//       double y2 = x2y2[1].toDouble ();
-      double xMu = x2 - x1;
+//       double xMu = x2 - x1;
-      double yMu = y2 - y1;
+//       double yMu = y2 - y1;
-      int subordinantAxisLength;
+//       int subordinantAxisLength;
 
 
-      // determine the dominate direction for the mapcanvas
+//       // determine the dominate direction for the mapcanvas
-      if (mapCanvas->width () > mapCanvas->height ())
+//       if (mapCanvas->width () > mapCanvas->height ())
-	{
+// 	{
-	  subordinantAxisLength = mapCanvas->height ();
+// 	  subordinantAxisLength = mapCanvas->height ();
-	  scaleFactor = yMu / subordinantAxisLength;
+// 	  scaleFactor = yMu / subordinantAxisLength;
-	  mapWindow = new QRect (x1, y1, xMu, xMu);
+// 	  mapWindow = new QRect (x1, y1, xMu, xMu);
-	}
+// 	}
-      else
+//       else
-	{
+// 	{
-	  subordinantAxisLength = mapCanvas->width ();
+// 	  subordinantAxisLength = mapCanvas->width ();
-	  scaleFactor = xMu / subordinantAxisLength;
+// 	  scaleFactor = xMu / subordinantAxisLength;
-	  mapWindow = new QRect (x1, y1, yMu, yMu);
+// 	  mapWindow = new QRect (x1, y1, yMu, yMu);
-	}
+// 	}
 
-      const char *xtent = (const char *) extent;
+//       const char *xtent = (const char *) extent;
-      string sql = "select asbinary(the_geom,";
+//       string sql = "select asbinary(the_geom,";
-      if (isNDR)
+//       if (isNDR)
-	sql += "'NDR'";
+// 	sql += "'NDR'";
-      else
+//       else
-	sql += "'XDR'";
+// 	sql += "'XDR'";
-      sql += ") as features from ";
+//       sql += ") as features from ";
-      sql += *it++;
+//       sql += *it++;
-      cout << sql.c_str () << endl;
+//       cout << sql.c_str () << endl;
-      pgc.Declare (sql.c_str (), true);
+//       pgc.Declare (sql.c_str (), true);
-      int res = pgc.Fetch ();
+//       int res = pgc.Fetch ();
-      cout << "Number of binary records: " << pgc.Tuples () << endl;
+//       cout << "Number of binary records: " << pgc.Tuples () << endl;
-      bool setExtent = true;
+//       bool setExtent = true;
-      // process each record
+//       // process each record
-      QPainter paint;
+//       QPainter paint;
 
-      paint.begin (mapCanvas);
+//       paint.begin (mapCanvas);
-      paint.setWindow (*mapWindow);
+//       paint.setWindow (*mapWindow);
-      QRect v = paint.viewport ();
+//       QRect v = paint.viewport ();
-      int d = QMIN (v.width (), v.height ());
+//       int d = QMIN (v.width (), v.height ());
-      paint.setViewport (v.left () + (v.width () - d) / 2,
+//       paint.setViewport (v.left () + (v.width () - d) / 2,
-			 v.top () + (v.height () - d) / 2, d, d);
+// 			 v.top () + (v.height () - d) / 2, d, d);
 
 
-      paint.setPen (Qt::red);
+//       paint.setPen (Qt::red);
 
-      for (int idx = 0; idx < pgc.Tuples (); idx++)
+//       for (int idx = 0; idx < pgc.Tuples (); idx++)
-	{
+// 	{
-	  cout << "Size of this record: " << pgc.GetLength (idx, 0) << endl;
+// 	  cout << "Size of this record: " << pgc.GetLength (idx, 0) << endl;
-	  // allocate memory for the item
+// 	  // allocate memory for the item
-	  char *feature = new char[pgc.GetLength (idx, 0) + 1];
+// 	  char *feature = new char[pgc.GetLength (idx, 0) + 1];
-	  memset (feature, '\0', pgc.GetLength (idx, 0) + 1);
+// 	  memset (feature, '\0', pgc.GetLength (idx, 0) + 1);
-	  memcpy (feature, pgc.GetValue (idx, 0), pgc.GetLength (idx, 0));
+// 	  memcpy (feature, pgc.GetValue (idx, 0), pgc.GetLength (idx, 0));
 
 
-	  cout << "Endian is: " << (int) feature[0] << endl;
+// 	  cout << "Endian is: " << (int) feature[0] << endl;
-	  cout << "Geometry type is: " << (int) feature[1] << endl;
+// 	  cout << "Geometry type is: " << (int) feature[1] << endl;
-	  // print the x,y coordinates
+// 	  // print the x,y coordinates
-	  double *x = (double *) (feature + 5);
+// 	  double *x = (double *) (feature + 5);
-	  double *y = (double *) (feature + 5 + sizeof (double));
+// 	  double *y = (double *) (feature + 5 + sizeof (double));
-	  cout << "x,y: " << setprecision (16) << *x << ", " << *y << endl;
+// 	  cout << "x,y: " << setprecision (16) << *x << ", " << *y << endl;
-	  QPoint pt = paint.xForm (QPoint ((int) *x, (int) *y));
+// 	  QPoint pt = paint.xForm (QPoint ((int) *x, (int) *y));
-	  cout << "Plotting " << *x << ", " << *y << " at " << pt.
+// 	  cout << "Plotting " << *x << ", " << *y << " at " << pt.
-	    x () << ", " << pt.y () << endl;
+// 	    x () << ", " << pt.y () << endl;
-	  paint.drawRect ((int) *x, mapWindow->bottom () - (int) *y, 15000,
+// 	  paint.drawRect ((int) *x, mapWindow->bottom () - (int) *y, 15000,
-			  15000);
+// 			  15000);
-	  // free it 
+// 	  // free it 
-	  delete[]feature;
+// 	  delete[]feature;
-	}
+// 	}
-      paint.end ();
+//       paint.end ();
-    }
+//     }
+  
 }
 
 
@@ -243,13 +256,13 @@ void
 QgisApp::drawPoint (double x, double y)
 {
   QPainter paint;
-  QWMatrix mat (scaleFactor, 0, 0, scaleFactor, 0, 0);
+  //  QWMatrix mat (scaleFactor, 0, 0, scaleFactor, 0, 0);
   paint.begin (mapCanvas);
   // paint.setWorldMatrix(mat);
   paint.setWindow (*mapWindow);
 
   paint.setPen (Qt::blue);
-  paint.drawPoint (x, y);
+  paint.drawPoint ((int)x, (int)y);
   paint.end ();
 }
 

src/qgisapp.h

@@ -41,6 +41,8 @@ public:
  	void zoomOut();
 	//! Zoom int
   	void zoomIn();
+	//! Zoom to full extent
+	void zoomFull();
 	//! Read Well Known Binary stream from PostGIS
 	void readWKB(const char *, QStringList tables);
 	//! Draw a point on the map canvas

src/qgisappbase.ui

@@ -86,6 +86,7 @@
         <action name="actionZoomIn"/>
         <action name="actionZoomOut"/>
         <action name="actionPan"/>
+        <action name="actionZoomFullExtent"/>
     </toolbar>
     <toolbar dock="2">
         <property name="name">
@@ -185,6 +186,17 @@
             <string>Refresh </string>
         </property>
     </action>
+    <action>
+        <property name="name">
+            <cstring>actionZoomFullExtent</cstring>
+        </property>
+        <property name="iconSet">
+            <iconset>image6</iconset>
+        </property>
+        <property name="text">
+            <string>Zoom to full extent</string>
+        </property>
+    </action>
 </actions>
 <images>
     <image name="image0">
@@ -205,6 +217,9 @@
     <image name="image5">
         <data format="XPM.GZ" length="3390">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</data>
     </image>
+    <image name="image6">
+        <data format="XPM.GZ" length="3550">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</data>
+    </image>
 </images>
 <connections>
     <connection>
@@ -243,6 +258,12 @@
         <receiver>QgisAppBase</receiver>
         <slot>drawLayers()</slot>
     </connection>
+    <connection>
+        <sender>actionZoomFullExtent</sender>
+        <signal>activated()</signal>
+        <receiver>QgisAppBase</receiver>
+        <slot>zoomFull()</slot>
+    </connection>
 </connections>
 <includes>
     <include location="local" impldecl="in implementation">qgisappbase.ui.h</include>
@@ -255,6 +276,7 @@
     <slot>zoomOut()</slot>
     <slot>init()</slot>
     <slot>drawLayers()</slot>
+    <slot>zoomFull()</slot>
 </slots>
 <layoutdefaults spacing="6" margin="11"/>
 </UI>

src/qgisappbase.ui.h

@@ -53,3 +53,9 @@ void QgisAppBase::drawLayers()
 {
 
 }
+
+
+void QgisAppBase::zoomFull()
+{
+
+}

src/qgsmapcanvas.cpp

@@ -36,6 +36,7 @@ void QgsMapCanvas::addLayer(QgsMapLayer *lyr){
   // update extent if warranted
   if(layers.size() == 1){
     fullExtent = lyr->extent();
+    currentExtent = fullExtent;
   }
 
   // set zpos to something...
@@ -44,8 +45,8 @@ void QgsMapCanvas::addLayer(QgsMapLayer *lyr){
 void QgsMapCanvas::render2(){
  QPainter *paint = new QPainter();
   paint->begin(this);
-  currentExtent = fullExtent;
+  //currentExtent = fullExtent;
-  QRect v = paint->viewport();
+  QRect v = rect();// paint->viewport();
   // calculate the translation and scaling parameters
   double muppX, muppY;
       muppY = currentExtent.height()/height();
@@ -109,3 +110,21 @@ void QgsMapCanvas::render(){
 void QgsMapCanvas::paintEvent(QPaintEvent *pe){
   render2();
 }
+QgsRect QgsMapCanvas::extent(){
+  return currentExtent;
+}
+void QgsMapCanvas::setExtent(QgsRect r){
+  currentExtent = r;
+}
+void QgsMapCanvas::clear(){
+  QPainter *p = new QPainter();
+  p->begin(this);
+  p->eraseRect(this->rect());
+  p->end();
+  
+}
+void QgsMapCanvas::zoomFullExtent(){
+  currentExtent = fullExtent;
+  clear();
+  render2();
+}

src/qgsmapcanvas.h

@@ -44,7 +44,11 @@ public:
      */
     void render();
     void render2();
+    void clear();
     double mupp();
+    QgsRect extent();
+    void setExtent(QgsRect );
+    void zoomFullExtent();
  private:
     void paintEvent(QPaintEvent *pe);
     //! map containing the layers by name

src/qgsrect.cpp

@@ -48,6 +48,15 @@ void QgsRect::normalize(){
     ymax = temp;
   }
 }
+void QgsRect::scale(double scaleFactor){
+  // scale from the center
+  double centerX = xmin + width()/2;
+  double centerY = ymin + height()/2;
+  xmin = centerX - (width()*scaleFactor)/2;
+  xmax = xmin + width()*scaleFactor;
+  ymin = centerY - (height()*scaleFactor)/2;
+  ymax = ymin + height()*scaleFactor;
+}
 QString QgsRect::stringRep() const{
   QString tmp;
   QString rep = tmp.setNum(xmin);;

src/qgsrect.h

@@ -37,6 +37,8 @@ class QgsRect{
     double width() const;
     //! Height of the rectangle
     double height() const;
+    //! Scale the rectangle around its center point
+    void scale(double);
     //! returns string representation of form xmin,ymin xmax,ymax
     QString stringRep() const;
     /*! Comparison operator