added option to ignore the first <n> lines

README.md

@@ -11,3 +11,6 @@ make -j4
 ## Usage
 ### Example scanning the FM radio band
 `soapy_power -f 80M:110M -n 10 -e 30 -B 30k -k 30 --pow2 -F rtl_power -R | ./Livepow`
+
+### Example loadind the data in the file scan.csv
+./Livepow scan.csv

inputparser.cpp

@@ -17,6 +17,10 @@ InputParser::InputParser(FILE* input,DisplayArea* display)
     timer->start(0);*/
 }
 
+void InputParser::sendParameters(unsigned long ignoreFirstNLines)
+{
+    this->ignoreFirstNLines=ignoreFirstNLines;
+}
 
 void InputParser::process()
 {
@@ -24,6 +28,11 @@ void InputParser::process()
     int c=fgetc(input);
     if(c==EOF) continue;
 
+    if(nbOfLinesParsed<ignoreFirstNLines){
+        if(c=='\n') nbOfLinesParsed++;
+        continue;
+    }
+
     switch(c){
         case ',':
             switch(index){
@@ -52,6 +61,7 @@ void InputParser::process()
             }
             lastMaxFreq=currentLine.maxFreq;
 
+            nbOfLinesParsed++;
             currentLine=line();
             decimal=false;
         break;
@@ -137,7 +147,7 @@ void InputParser::sendPixel()
         maxPow=newMax;
     }
 
-    int col=qRound(currentPowerValue-minPow*255/(maxPow-minPow));
+    int col=qRound((currentPowerValue-minPow)*255/(maxPow-minPow));
     display->setPixel(currentX,currentY,qRgba(col,col,col,255));
     currentX++;
     currentPowerValue=0;

inputparser.h

@@ -24,6 +24,8 @@ class InputParser : public QObject
 public:
     InputParser(FILE* input,DisplayArea* display);
 
+    void sendParameters(unsigned long ignoreFirstNLines);
+
 private:
     unsigned long minFreq=-1;
     unsigned long maxFreq=0;
@@ -35,6 +37,9 @@ private:
 
     unsigned long index=0;
 
+    unsigned long nbOfLinesParsed=0;
+    unsigned long ignoreFirstNLines=0;
+
     line currentLine;
 
     FILE* input;

main.cpp

@@ -12,6 +12,11 @@ int main(int argc, char *argv[])
     argsParser.addHelpOption();
     argsParser.addPositionalArgument("source","csv file to read data from, default stdin");
 
+    QCommandLineOption skipFirstLines(QStringList() << "s" << "ignoreFirstLines",
+              "Skip the first <n> lines",
+              "number of lines");
+    argsParser.addOption(skipFirstLines);
+
     argsParser.process(a);
 
     MainWindow w;

mainwindow.cpp

@@ -41,6 +41,10 @@ void MainWindow::sendArgs(QCommandLineParser *argsParser)
 
     parser=new InputParser(input,displayArea);
 
+    if(argsParser->isSet("s")){
+        parser->sendParameters(argsParser->value("s").toLong());
+    }
+
     QThread* workerThread=new QThread();
 
     parser->moveToThread(workerThread);