Method updateChart

src/Components/Spectrum.js:199–315

()

  };

  updateChart(){
    if(this.chartRef !== null ){
      // Get the reference to the chart object
      var chart = this.chartRef.current;

      if(chart !== null ){
        if(SerialDataObject.data.length !== 0 && !SerialDataObject.pauseFlag){
          // Get the size of the data
          var nel = SerialDataObject.data.length;
          var nvars = SerialDataObject.data[nel-1].length;

          // Check if there are enough chart data objects
          var k = chart.data.datasets.length;
          while(chart.data.datasets.length < nvars ){
            // Add a new dataset if its too short
            chart.data.datasets.push(
              {
                label: (k+1) ,
                color: plotFontColor,
                data: [],
                borderColor: colorList[k % colorList.length],
                backgroundColor: colorList[k % colorList.length],
                borderWidth: GlobalSettings.global.lineThickness,
              },
            )
            k = k + 1;
          }
          while(chart.data.datasets.length > nvars ){
            // If there are too many, remove the last one.
            chart.data.datasets.pop();
          }

          // Line width
          for (var i = 0; i < chart.data.datasets.length; i++){
            chart.data.datasets[i].borderWidth = GlobalSettings.global.lineThickness;
            chart.data.datasets[i].pointRadius = GlobalSettings.global.pointRadius;
          }

          // Compute the sample rate
          var sampleRate = SerialDataObject.sampleRate;
          if(GlobalSettings.spectrum.useFixedSampleRate){
            sampleRate = GlobalSettings.spectrum.sampleRate;
          }
          else{
            GlobalSettings.spectrum.sampleRate = sampleRate;
          }

          // Update with data from the serial port
          var magMax = 0;
          var magMin = 0;
          for(var k = 0; k < nvars; k++){
            var s = createSpectrum(SerialDataObject.dataIdx,SerialDataObject.data,k,sampleRate);   
            if(k===0){
              magMax = Math.max(...s.mag);
              magMin = Math.min(...s.mag);
            }
            else{
              magMax = Math.max(magMax,Math.max(...s.mag));