Further updates to flot histogram implementation - added legend and try to map colours more intelligently

Author: timlinux

resources/html/chart.html

@@ -20,13 +20,14 @@
                         yaxis  : { zoomRange: null, panRange: null },
                         xaxis  : { zoomRange: null, panRange: null },
                         zoom   : { interactive : true },
-                        pan    : { interactive : true }
+                        pan    : { interactive : true },
+                        legend : { show : true }
                       };
         $.plot($("#chart"), d, options);
       }
-      function addSeries( theSeries )
+      function addSeries( theSeries, theBand, theColor )
       {
-        d.push( { data: theSeries } );
+        d.push( { data: theSeries, label: "Band " + theBand, color: theColor } );
         replot();
         //alert( theSeries );
       }

src/app/qgsrasterlayerproperties.cpp

@@ -1884,7 +1884,10 @@ void QgsRasterLayerProperties::refreshHistogram()
   //
   //now draw actual graphs
   //
-
+  int myRedBand = mRasterLayer->bandNumber( cboRed->currentText() );
+  int myGreenBand = mRasterLayer->bandNumber( cboGreen->currentText() );
+  int myBlueBand = mRasterLayer->bandNumber( cboBlue->currentText() );
+  int myGrayBand = mRasterLayer->bandNumber( cboGray->currentText() );
   for ( int myIteratorInt = 1;
       myIteratorInt <= myBandCountInt;
       ++myIteratorInt )
@@ -1903,7 +1906,18 @@ void QgsRasterLayerProperties::refreshHistogram()
       mySeriesJS += QString("[%1,%2]").arg(myBin).arg(myBinValue);
       myFirst = false;
     }
-    mySeriesJS += "]);";
+    QString myColor = "";
+    if ( myIteratorInt == myRedBand )
+      myColor = "#FF0000";
+    else if ( myIteratorInt == myGreenBand )
+      myColor = "#00FF00";
+    else if ( myIteratorInt == myBlueBand )
+      myColor = "#0000FF";
+    else if ( myIteratorInt == myGrayBand )
+      myColor = "#FCFCFC";
+    else
+      myColor = "#F0C1D1";
+    mySeriesJS += QString("], %1, '%2');").arg(myIteratorInt).arg( myColor );
     //QgsDebugMsg( mySeriesJS );
     mWebPlot->page()->mainFrame()->evaluateJavaScript( mySeriesJS );
   }