From bba7a481ad093a7814cce2f90f78bef709f28b02 Mon Sep 17 00:00:00 2001
From: leo <leo.lemaire007@orange.fr>
Date: Sun, 6 Jun 2021 15:21:41 +0200
Subject: [PATCH] automatic scale for the color based on the max power values

---
 displayarea.cpp | 16 ++++++++++++++++
 displayarea.h   |  3 +++
 inputparser.cpp | 13 ++++++++++++-
 inputparser.h   |  3 +++
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/displayarea.cpp b/displayarea.cpp
index 9b6239b..4ec171b 100644
--- a/displayarea.cpp
+++ b/displayarea.cpp
@@ -45,3 +45,19 @@ bool DisplayArea::saveImage(const QString &fileName, const char *fileFormat)
 {
     return image.save(fileName, fileFormat);
 }
+
+void DisplayArea::updateColorMap(float oldMin, float oldMax, float newMin, float newMax)
+{
+    QRgb* imagePixels=(QRgb*)image.bits();
+    for(unsigned long long i=0;i<image.sizeInBytes()/sizeof(QRgb);i++){
+        QRgb currentColor=imagePixels[i];
+        QRgb newColor=qRgba(remap(qRed(currentColor),oldMin,oldMax,newMin,newMax),remap(qGreen(currentColor),oldMin,oldMax,newMin,newMax),remap(qBlue(currentColor),oldMin,oldMax,newMin,newMax),qAlpha(currentColor));
+        imagePixels[i]=newColor;
+    }
+}
+
+char DisplayArea::remap(char c, float omin, float omax, float nmin, float nmax)
+{
+    float nVal=(255*(omin-nmin)+c*(omax-omin))/(nmax-nmin);
+    return qRound(nVal);
+}
diff --git a/displayarea.h b/displayarea.h
index 03e9322..569a564 100644
--- a/displayarea.h
+++ b/displayarea.h
@@ -10,6 +10,7 @@ public:
     DisplayArea(QWidget *parent = nullptr);
     void setPixel(int x,int y,unsigned int col);
     bool saveImage(const QString &fileName, const char *fileFormat);
+    void updateColorMap(float oldMin,float oldMax,float newMin,float newMax);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
@@ -17,6 +18,8 @@ protected:
 private:
     void resizeImage(QImage *image, const QSize &newSize);
 
+    char remap(char val,float omin,float omax,float nmin,float nmax);
+
     QImage image;
 
 public slots:
diff --git a/inputparser.cpp b/inputparser.cpp
index b69fc3b..9b79c31 100644
--- a/inputparser.cpp
+++ b/inputparser.cpp
@@ -123,7 +123,18 @@ void InputParser::computeEpochDate()
 void InputParser::sendPixel()
 {
     currentPowerValue*=sign;
-    int col=qRound((80-currentPowerValue)*6);
+
+    if(currentPowerValue<minPow||currentPowerValue>maxPow){
+        float newMin=qMin(currentPowerValue,minPow);
+        float newMax=qMax(currentPowerValue,maxPow);
+
+        display->updateColorMap(minPow,maxPow,newMin,newMax);
+
+        minPow=newMin;
+        maxPow=newMax;
+    }
+
+    int col=qRound(currentPowerValue-minPow)*255/(maxPow-minPow);
     display->setPixel(currentX,currentY,qRgba(col,col,col,255));
     currentX++;
     currentPowerValue=0;
diff --git a/inputparser.h b/inputparser.h
index a01fd23..7bdcbaf 100644
--- a/inputparser.h
+++ b/inputparser.h
@@ -28,6 +28,9 @@ private:
     unsigned long minFreq=-1;
     unsigned long maxFreq=0;
 
+    float minPow=__FLT_MAX__;
+    float maxPow=0;
+
     unsigned long lastMaxFreq=0;
 
     unsigned long index=0;