added possibility to load data from csv file

inputparser.cpp

@@ -58,6 +58,9 @@ void InputParser::process()
         case '.':
             decimal=true;
         break;
+        case '-':
+            sign=-1;
+        break;
         default:
             switch(index){
                 case 0:
@@ -134,7 +137,7 @@ 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;

main.cpp

@@ -1,11 +1,21 @@
 #include "mainwindow.h"
 
 #include <QApplication>
+#include <QCommandLineParser>
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
+
+    QCommandLineParser argsParser;
+    argsParser.setApplicationDescription("A live heatmap creator for soapy_power");
+    argsParser.addHelpOption();
+    argsParser.addPositionalArgument("source","csv file to read data from, default stdin");
+
+    argsParser.process(a);
+
     MainWindow w;
+    w.sendArgs(&argsParser);
     w.show();
     return a.exec();
 }

mainwindow.cpp

@@ -16,8 +16,29 @@ MainWindow::MainWindow(QWidget *parent)
 {
     setCentralWidget(displayArea);
 
+    createActions();
+    createMenus();
+
+    setWindowTitle(tr("LivePow"));
+}
+
+MainWindow::~MainWindow()
+{
+}
+
+void MainWindow::sendArgs(QCommandLineParser *argsParser)
+{
+    const QStringList posArgs = argsParser->positionalArguments();
+
     FILE* input=stdin;
 
+    if(posArgs.length()==1){
+        QFile file(posArgs.at(0));
+        QFileInfo fileInfo(file);
+        input=fopen(fileInfo.absoluteFilePath().toLatin1(),"r");
+    }
+    else if(posArgs.length()>1) fprintf(stderr,"too much positionnal args, using stdin");
+
     parser=new InputParser(input,displayArea);
 
     QThread* workerThread=new QThread();
@@ -26,15 +47,6 @@ MainWindow::MainWindow(QWidget *parent)
     connect(workerThread, &QThread::started, parser, &InputParser::process);
     connect(workerThread, &QThread::finished, workerThread, &QThread::deleteLater);
     workerThread->start();
-
-    createActions();
-    createMenus();
-
-    setWindowTitle(tr("LivePow"));
-}
-
-MainWindow::~MainWindow()
-{
 }
 
 void MainWindow::save(){

mainwindow.h

@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 
 #include <QMainWindow>
+#include <QCommandLineParser>
 
 class DisplayArea;
 class InputParser;
@@ -14,7 +15,7 @@ public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
-    static void tick();
+    void sendArgs(QCommandLineParser* argsParser);
 
     InputParser *parser;